Consulta: subjectFacets:"Population dynamics"
Registros recuperados: 145
Data/hora: 11/06/2024 05:39:32

Monitoreo de Eoreuma loftini (Lepidoptera: Crambidae) en caña de azúcar con su feromona sexual en Morelos, México.
Provedor de dados: 32
Autores: Barroso Aké, Hanzel Jesús.
Eoreuma loftini (Lepidoptera: Crambidae) es un problema fitosanitario en la zona productora de caña de azúcar de Tlaquiltenango, Morelos, México. Para ampliar el conocimiento de esta especie, en este trabajo se plantearon los objetivos siguientes: conocer la fluctuación población de E. loftini; evaluar la eficacia de captura de machos con la feromona comercial; determinar la relación entre capturas, temperatura y precipitación pluvial y estimar la duración del atrayente en campo. Se establecieron dos experimentos con trampas tipo “ala”; el primero del mes de febrero de 2013 con revisiones quincenales hasta enero de 2014. En el cual, el liberador de la feromona se renovó mensualmente. El experimento dos, se llevó a cabo de abril a diciembre de 2013, con...
Palavras-chave: Fluctuación poblacional; Regresión lineal; Trampa tipo "ala"; Citocromo oxidasa I.; Population dynamics; Linear regression; Trap type "wing"; Cytochrome oxidase I.; Entomología y Acarología; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2364

Dinámica poblacional de especies de IPS (Curculionidae : Scolytinae) y sus depredadores empleando trampas cebadas con feromonas en La Calera, Cd. Guzmán; Las Coloradas y Corralitos en Tecalitlán, Jalisco.
Provedor de dados: 32
Autores: Hernández Livera, Rubén Angel.
Se realizó un experimento de monitoreo durante un año de junio de 2006 a mayo de 2007, utilizando trampas multiembudo cebadas con las feromonas ipsenol, ipsdienol, combinación (ipsenol-ipsdienol), en la región suroeste de Jalisco, México; con la finalidad de identificar las especies de Ips y sus depredadores presentes en ese lugar; así como, conocer su dinámica poblacional. Cada mes se recolectaban los insectos del contenedor de cada trampa y se identificaban;  las especies de Ips encontradas se identificaban con base a las características morfologícas externas y la genitalia.  Los resultados indican que las especies de Ips y Pseudips  presentes en los sitios de investigación fueron Ips lecontei (Swaine), Ips cribricollis (Eichhoff), Ips calligraphus...
Palavras-chave: Dinámica poblacional; Ips lecontei; Ips cribricollis; Ips calligraphus; Pseudips mexicanus; Feromona; Ipsenol; Ipsdienol; Ipsenol-ipsdienol; Lasconotus spp; Temnochila virescens; Enoclerus arachnoides; Trampa Lindgren; Jalisco; Population dynamics; Pheromone; Doctorado; Entomología; Acarología; Entomology.
Ano: 2010
URL: http://hdl.handle.net/10521/81

Dinámica poblacional de especies de IPS (Curculionidae : Scolytinae) y sus depredadores empleando trampas cebadas con feromonas en La Calera, Cd. Guzmán; Las Coloradas y Corralitos en Tecalitlán, Jalisco.
Provedor de dados: 32
Autores: Hernández Livera, Rubén Angel.
Se realizó un experimento de monitoreo durante un año de junio de 2006 a mayo de 2007, utilizando trampas multiembudo cebadas con las feromonas ipsenol, ipsdienol, combinación (ipsenol-ipsdienol), en la región suroeste de Jalisco, México; con la finalidad de identificar las especies de Ips y sus depredadores presentes en ese lugar; así como, conocer su dinámica poblacional. Cada mes se recolectaban los insectos del contenedor de cada trampa y se identificaban;  las especies de Ips encontradas se identificaban con base a las características morfologícas externas y la genitalia.  Los resultados indican que las especies de Ips y Pseudips  presentes en los sitios de investigación fueron Ips lecontei (Swaine), Ips cribricollis (Eichhoff), Ips calligraphus...
Palavras-chave: Dinámica poblacional; Ips lecontei; Ips cribricollis; Ips calligraphus; Pseudips mexicanus; Feromona; Ipsenol; Ipsdienol; Ipsenol-ipsdienol; Lasconotus spp; Temnochila virescens; Enoclerus arachnoides; Trampa Lindgren; Jalisco; Population dynamics; Pheromone; Doctorado; Entomología; Acarología; Entomology.
Ano: 2010
URL: http://hdl.handle.net/10521/81

Dinámica poblacional espacio-temporal de Dendroctonus mexicanus Hopkins (Curculionidae: Scolytinae) en el municipio de Aramberri, Nuevo León.
Provedor de dados: 32
Autores: Cuéllar Rodríguez, Luis Gerardo.
En el presente estudio se evaluó la distribución espacial y temporal de las poblaciones de Dendroctonus mexicanus en bosques de Pinus cembroides del sur del estado de Nuevo León, México. Se monitorearon 30 200 ha, de las cuales 11 693.5 ha estuvieron dominadas por P. cembroides, la superficie afectada por D. mexicanus entre octubre de 2008 y octubre de 2012 fue de 1428.95 ha. El número de hectáreas afectadas disminuyó considerablemente de 2008 cuando se registraron 438.5 ha hasta la última evaluación en octubre de 2012 en que sólo se cuantificaron 74.1 ha afectadas. La mayoría de las infestaciones se presentaron en las cumbres y partes altas de las laderas, los frentes de avance tuvieron un movimiento multidireccional descendente. Este comportamiento...
Palavras-chave: Dendroctonus mexicanus; Dinámica poblacional; Distribución espacial; Population dynamics; Spatial distribution; Entomología y Acarología; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/1857

Multiactor Modeling of Settling Decisions and Behavior in the San Mariano Watershed, the Philippines: a First Application with the MameLuke Framework
Provedor de dados: 7
Autores: Huigen, Marco G. A.; Leiden University; mhuigen@uni-hohenheim.de; Overmars, Koen P.; Leiden University; overmars@cml.leidenuniv.nl; de Groot, Wouter T.; Leiden University; degroot@cml.leidenuniv.nl.
Land-use system dynamics and demographic dynamics are tightly coupled. In environmental science and studies of changes in land use and land cover, an unequivocal relationship is sometimes found between both systems, especially in coarse-scale studies. To obtain a better understanding of these intermingling dynamics, we formulated an agent-based model, the MameLuke settlement model, that used a deductive approach to investigate these relationships. The model was constructed based on ethnographic histories of farm households in San Mariano, the Philippines. The model was calibrated visually. Although this calibration approach proved to be very inefficient, the model itself still outperformed a random model. The model formulation process and the model...
Tipo: Peer-Reviewed Reports
Palavras-chave: Actor decision-making; Agent-based models; Ethnic distribution; Ethnographic history; Land-use dynamics; Mameluke framework; Philippines; Population dynamics.
Ano: 2006

Grasshopper Population Ecology: Catastrophe, Criticality, and Critique
Provedor de dados: 7
Autores: Lockwood, Dale R; Colorado State University; dale.lockwood@colostate.edu; Lockwood, Jeffrey A; University of Wyoming;.
Grasshopper population dynamics are an important part of the North American rangeland ecosystem and an important factor in the economies that derive from the rangeland. Outbreak dynamics have plagued management strategies in the rangeland, and attempts to find simple, linear and mechanistic solutions to both understanding and predicting the dynamics have proved fruitless. These efforts to ground theory in a correspondence with the &amp;#8220;real&amp;#8221; world, including whether the population dynamics are ultimately density dependent or density independent, have generated abundant heat but little light. We suggest that a pragmatic approach, in which theories are taken to be &amp;#8220;tools&amp;#8221; rather than competing claims of truth, has greater...
Tipo: Peer-Reviewed Reports
Palavras-chave: Catastrophe theory; Complexity science; Grasshoppers; Models; Pest management; Population dynamics; Rangeland ecosystem; Self-organized criticality.
Ano: 2008

When to Spray: a Time-Scale Calculus Approach to Controlling the Impact of West Nile Virus
Provedor de dados: 7
Autores: Thomas, Diana; Montclair State University; thomasdia@mail.montclair.edu; Weedermann, Marion; Dominican University; mweederm@dom.edu; Billings, Lora; Montclair State University; billingsl@mail.montclair.edu; Hoffacker, Joan; Clemson University; johoff@clemson.edu; Washington-Allen, Robert A; Texas A&amp;M University; University of Virginia; Adjunct at University of Tennessee; washingtonra@mac.com.
Tipo: Peer-Reviewed Reports
Palavras-chave: Basic reproduction number; Delay differential equation; Dynamic equations on a time scale; Population dynamics; West Nile Virus.
Ano: 2009

A preliminary analysis of death cause, capture-related mortality, and survival of adult red deer in northwestern Patagonia
Provedor de dados: 67
Autores: Flueck,Werner T; Smith-Flueck,Joanne M; Bonino,Never A.
The red deer (Cervus elaphus), among the world´s 14 most invasive exotic mammals, has recently arrived in Patagonia. Forty-seven deer were captured, marked with radio collars, and monitored in order to determine survival rates and identify causes of death. Net gunning from a helicopter allowed captures to be evenly distributed through the study area and in a timely manner. The absence of capture related mortality in our study agrees with previously reported low rates for this method. Animals were monitored for periods ranging from 5 to 2611 days. Ten animals provided censored values due to radio failures or being shot: they survived on average 811 days (SE = 221) after capture. Ten animals experienced natural deaths with an average time alive after capture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasion; Cervus elaphus; Puma concolor; Predation; Disease; Radio telemetry; Population dynamics; Capture by net gunning.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2005000100004

Introduced herbivores and the Allee effect in animal-pollinated plants
Provedor de dados: 67
Autores: Vázquez,Diego P.
Interspecific interactions can be modulated by the community context in which they occur. In this paper I focus on plant-pollinator interactions and their modulation by introduced herbivores through changes in plant population density. I first develop a mathematical model that relates the population density of an animal-pollinated plant species with pollinator visitation frequency, pollination, reproduction and per capita growth rate. This model allows me to investigate how several pollination-related parameters -including relative abundance of the focal plant species, pollinator specialization, pollination quantity and quality and pollen limitation of reproduction- influence the relationship between per capita growth rate and population density. I then...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Allee effect; Density dependence; Introduced herbivores; Mutualism; Plant reproduction; Pollination; Pollinator specialization and generalization; Population dynamics.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2007000100003

Beroe ovata Mayer, 1912 (ctenophora, atentaculata, beroida) в прибрежных водах северо-восточной части Черного моря
Provedor de dados: 13
Autores: Луппова, Н. Е.
Beroe ovata впервые отмечен у побережья Северного Кавказа в августе 1997 г. Численность его была значительна, в то время как популяция другого гребневика - Mnemiopsis leidyi -была заметно угнетена. В настоящей работе рассмотрены изменения плотности популяции и среднего размера тела В. ovata в связи с выеданием им пищи - мнемиопсиса - с 1997 по 2000 гг.
Tipo: Journal Contribution
Palavras-chave: Population dynamics; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/498

Population ecology of the multivoltine Neotropical gall midge Eugeniamyia dispar (Diptera, Cecidomyiidae)
Provedor de dados: 76
Autores: Mendonça, Jr.,Milton de S.; Romanowski,Helena P.
Our understanding of the population ecology of insect gallers is largely built on examples from temperate zones, but tropical and subtropical gallers may present distinct patterns of abundance and distribution across time. Eugeniamyia dispar Maia, Mendonça &amp;amp; Romanowski, 1996 is a multivoltine Neotropical cecidomyiid that induces spongy leaf galls on Eugenia uniflora (Myrtaceae). Galls were censused in the urban area of Porto Alegre, southern Brazil on six plants at two sites, for two years, at roughly weekly intervals. Overall 9,694 eggs, galling attempts and galls were counted. New galls continuously appear on developing leaves, but galls with live inducers are absent from June to at least early August. Galls on a same shoot develop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Eugenia uniflora; Gall-inducer; Myrtaceae; Population dynamics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000200009

Population biology of the crab Armases angustipes (Crustacea, Decapoda, Sesarmidae) at Brazilian tropical coast
Provedor de dados: 76
Autores: Araújo,Marina de Sá Leitão C. de; Tenório,Deusinete de O.; Castiglioni,Daniela da S.
The semi terrestrial crabs are important elements of the fauna of coastal regions. The aim of this study was to analyze the population structure of Armases angustipes (Dana, 1852) at estuaries of the Ariquindá River, considered a non impacted area, and Mamucabas River, considered a few impacted area, on the south coast of state of Pernambuco, Brazil. The species occurred in all months of the year. The number of individuals per month varied, being higher in the months of transition between the seasons. This is probably due to significant seasonal variations of air and burrow temperature and burrow salinity. There was no sexual dimorphism in size of A. angustipes in the mangrove of Ariquindá River, but males were larger than females in the mangrove of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Reproductive period; Sesarmid.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000200004

Ecologia populacional de especies arboreas na estacao ecologica do Panga (Uberlandia-MG).
Provedor de dados: 14
Autores: AQUINO, F. de G.; OLIVEIRA, M. C. de; RIBEIRO, J. F.; SCHIAVINI, I.
bitstream/CPAC-2009/24594/1/bolpd_26.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: ECFLOR100; Acacia glomerosa; Uberlandia; Minas Gerais; Brasil; Species; Plant population; Growth.; Anadenanthera Macrocarpa; Biodiversidade; Árvore; Crescimento; Cerrado; Ecologia Vegetal; Dinâmica Populacional; Espécie; Mortalidade; População de Planta.; Brazil; Biodiversity; Plant ecology; Population dynamics; Mortality; Trees.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/548581

Modelos matematicos de simulacao e a dinamica populacional de rebanho bovino.
Provedor de dados: 14
Autores: AFFIN, O. A. D.; SANTOS, N. A. dos; BARCELLOS, J. M.
bitstream/item/101496/1/doc-57.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Agropecuaria; Simulation.; Bovino; Dinâmica Populacional; Modelo Matemático; Pesquisa; Simulação.; Agriculture; Cattle; Mathematical models; Population dynamics; Research.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549101

Situação da cultura da pupunha no Estado do Acre.
Provedor de dados: 14
Autores: BERGO, C. L.
Este trabalho tem por objetivo relatar a situação da pupunha-palmiteira cultivada no Estado do Acre, podendo servir também para orientar futuras discussões e pesquisas sobre a cultura da pupunha na Região Norte.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Peach palm; Palmetto; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Dinámica poblacional.; Cadena de suministro; Pupunha; Bactris gasipaes; Plantio; Dinâmica populacional; Palmito; Produção; Cadeia produtiva; Population dynamics; Supply chain.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/661752

Efeito do sistema de preparo do solo e rotacao de culturas na dinamica de populacao de artropodes do solo.
Provedor de dados: 14
Autores: OLIVEIRA, M. A. S.; RESCK, D. V. S.; ICUMA, I. M.; ALVES, R. T.
bitstream/CPAC-2010/24250/1/comtec-73.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Rotational cropping.; Cerrado; Dinâmica Populacional; Inseto; Manejo do Solo; Rotação de Cultura.; Insecta; Population dynamics; Soil management.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567583

Artrópodes edáficos: influência dos sistemas de preparo do solo e de rotação de culturas.
Provedor de dados: 14
Autores: OLIVEIRA, C. M. de; RESCK, D. V. S.; FRIZZAS, M. R.
RESUMO: Este trabalho objetivou avaliar a influência de sistemas de preparo de solo e de rotação de culturas e pastagem na abundância e dinâmica de artrópodes edáficos. O experimento, instalado em Planaltina, DF, foi composto por 17 tratamentos que corresponderam a sistemas de preparo de solo (convencional e direto) e a rotação de culturas, pastagem e vegetação nativa (Cerrado). Realizaram-se amostragens de solo em três profundidades (0-5 cm, 5-10 cm e 10-20 cm) e em quatro épocas do ano (fevereiro, maio, agosto/setembro e outubro/novembro) entre 2003 e 2006. Os artrópodes foram extraídos em funil de Berlese-Tüllgren e identificados com relação à ordem. Coletaram-se artrópodes pertencentes a três classes: Insecta, Arachnida e Collembolla. Observou-se que...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Entomologia; Dinâmica Populacional; Inseto; Gramínea; Leguminosa; Manejo do Solo.; Grasses; Entomology; Legumes; Population dynamics; Soil management.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570260

Épocas de ocorrência e medidas de controle dos insetos associados aos frutos da gravioleira, em Rio Branco, Acre.
Provedor de dados: 14
Autores: FAZOLIN, M.; LEDO, A. da S.
A demanda por informações sobre o cultivo da gravioleira na região de Rio Branco, vem aumentando consideravelmente, principalmente no que se refere ao ataque de pragas. O ataque de insetos, afeta a qualidade dos frutos ou inviabilizam a sua comercialização, pela baixa qualidade que apresentam. Os frutos são danificados tanto interna como externamente, sendo que, cm ambos os casos, é comum a ocorrência de patógenos, que agravam ainda mais o problema. Este trabalho teve por objetivo fornecer informações sobre os insetos que se alimentam dos frutos de graviola em Rio Branco, dentro de uma proposta para a definição de wn manejo integrado dessas pragas na Região.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Guanabana; Ensacamento do fruto; Cerconota anonella; Broca da semente; Bephrateloides spp; Antiteuchus sepulcralis; Cigarrinha da graviola; Hemispherical scale; Rio Branco (AC); Acre; Western Amazon; Amazonia Ocidental; Trigona spp; Ceresa peruensis; Citrus snow scale; Bees; Abeja; Sapotes agrios.; Métodos de control; Dinámica poblacional; Control físico; Cochinilla; Plagas de plantas; Percevejo; Broca do fruto; Flutuação populacional; Controle mecânico; Inseto; Annona muricata; Irapuã.; Graviola; Praga de planta; Abelha; Saissetia coffeae; Cochonilha; Plant pests; Insecta; Unaspis citri; Apoidea.; Control methods; Soursops; Population dynamics; Physical control; Scale insects.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/492604

Large-scale genetic patchiness among NE Atlantic populations of the brittle star Ophiothrix fragilis
Provedor de dados: 5
Autores: Muths, D.; Jollivet, D.; Gentil, F.; Davoult, D.
The brittle star Ophiothrix fragilis (Abilgaard, 1789) constitutes a heterogeneous morphological group that can be subdivided into 4 varieties. The species is also characterized by high demographic variability. The present study explores the possibility of genetic patchiness arising due to admixture of varieties or recruitment heterogeneity. We sequenced a portion of the mitochondrial cytochrome oxidase subunit I (mtCOI) gene and genotyped 7 allozymes from 21 populations of the 2 most common varieties. While mtCOI analyses showed that all the varieties grouped together with virtually no divergence among them (&lt; 1%), a clear divergence (18.6%) was evident between the northern Atlantic populations and individuals collected in the Mediterranean and along...
Tipo: Text
Palavras-chave: Echinoderm; Allozyme; MtCOI; Population dynamics; Ecotypes; Dispersal; Recruitment.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00301/41247/40439.pdf

Larval connectivity of pearl oyster through biophysical modelling; evidence of food limitation and broodstock effect
Provedor de dados: 5
Autores: Thomas, Yoann; Dumas, Franck; Andrefouet, Serge.
The black-lip pearl oyster (Pinctada margaritifera) is cultured extensively to produce black pearls, especially in French Polynesia atoll lagoons. This aquaculture relies on spat collection, a process that experiences spatial and temporal variability and needs to be optimized by understanding which factors influence recruitment. Here, we investigate the sensitivity of P. margaritifera larval dispersal to both physical and biological factors in the lagoon of Ahe atoll. Coupling a validated 3D larval dispersal model, a bioenergetics larval growth model following the Dynamic Energy Budget (DEB) theory, and a population dynamics model, the variability of lagoon-scale connectivity patterns and recruitment potential is investigated. The relative contribution of...
Tipo: Text
Palavras-chave: Pearl oyster; Lagoon; Biophysical modelling; Connectivity; Population dynamics; DEB model.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00321/43192/42926.pdf

Assessing the sensitivity of bivalve populations to global warming using an individual-based modelling approach
Provedor de dados: 5
Autores: Thomas, Yoann; Bacher, Cedric.
Climate change exposes benthic species populations in coastal ecosystems to a combination of different stressors (e.g. warming, acidification and eutrophication), threatening the sustainability of the ecological functions they provide. Thermal stress appears to be one of the strongest drivers impacting marine ecosystems, acting across a wide range of scales, from individual metabolic performances to geographic distribution of populations. Accounting for and integrating the response of species functional traits to thermal stress is therefore a necessary step in predicting how populations will respond to the warming expected in coming decades. Here, we developed an individual‐based population model using a mechanistic formulation of metabolic processes...
Tipo: Text
Palavras-chave: Benthic species; Biogeography; Climate scenario; Dynamic energy budget; Global warming; Phenology; Population dynamics; Temperature tolerance.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00450/56163/57710.pdf

Effets d’une exposition alimentaire chronique à un mélange environnemental de PCB et PBDE sur les traits d’histoire de vie, la bioénergétique et la dynamique des populations de poissons
Provedor de dados: 5
Autores: Horri, Khaled.
Persistent organic pollutants (POPs) are a broad group of compounds with varying physicochemical and toxic properties. Among POP, polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are two families of hydrophobic compounds sharing some similar environmental properties such as hydrophobicity, persistence, bioaccumulation and toxicity. Previous studies have demonstrated that these compounds could affect fish life-history traits such as survival, growth and reproductive success. However, few studies have focused on environmental situations as most previous works investigated the effect of either single congeners, or single families of molecules among POP, or high concentrations, so that results can hardly be transposed to natural...
Tipo: Text
Palavras-chave: Poisson-zèbre; Écotoxicologie; Polluants organiques persistants; Allocation d’énergie; Modes d’action; Dynamique des populations; Populations structurées; Zebrafish; Ecotoxicology; Persistent organic pollutants; Energy allocation; Modes of action; Population dynamics; Structured populations.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00444/55592/57219.pdf

La Baie de Seine: Peuplements et especes benthiques en regime perturbe
Provedor de dados: 5
Autores: Cabioch, L; Retiere, C.
The waters of the Seine River are polluted by urban, industrial and agricultural effluents. In addition direct industrial wastes inputs are emptied into the estuary. Within the limits of the Seine Bay program it was not possible to research pollution impacts on every estuarine ecosystem link; so only benthos have been studied. To take time response of organisms into account, the authors have defined indicators or quantitative evaluation of parameters, reflecting physiological state. They have studied population fluctuations caused by natural or man induced effects.
Tipo: Text
Palavras-chave: Hydrodynamics; Population dynamics; Population structure; Bioaccumulation; Pollution effects; Marine pollution; Ecosystem disturbance; Benthos.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1304.pdf

Evaluation of the bioeconomic sustainability of multi-species multi-fleet fisheries under a wide range of policy options using ISIS-Fish
Provedor de dados: 5
Autores: Pelletier, Dominique; Mahevas, Stephanie; Drouineau, Hilaire; Vermard, Youen; Thebaud, Olivier; Guyader, Olivier; Poussind, Benjamin.
In order to provide reliable scientific advice and support for fisheries management, it is necessary to evaluate the biological and economic sustainability of complex fisheries, such as multi-species multi-fleet fisheries. Existing policy-screening modelling tools are not fully suitable in this purpose due to either an over-simplified description of population dynamics, or due to the lack of consideration of economic aspects. In this paper, we present a package that enables quantitative bioeconomic assessment of management scenarios. Population dynamics is described through spatially- and seasonally-explicit models. Exploitation dynamics is characterized by several fishing activities with specific spatial and seasonal features, and practiced by several...
Tipo: Text
Palavras-chave: Policy screening; Natural resource management; Fisheries dynamics; Bioeconomic model; Population dynamics; Complex systems; Simulation tool.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6782.pdf

Modelling benthic invasion by the colonial gastropod Crepidula fornicata and its competition with the bivalve Pecten maximus . 1. A new 0D model for population dynamics of colony-forming species
Provedor de dados: 5
Autores: Menesguen, Alain; Gregoris, Thomas.
The north-American marine gastropod Crepidula fornicata (Linné 1758), commonly called slipper limpet, has been introduced accidentally in Great Britain, along with American oysters (Crassostrea virginica) at the end of the 19th century. Its spreading, enhanced by oyster transport and international shipping, turned into invasion of a lot of benthic grounds along the North-European coasts. When local conditions are favorable to larval confinement and adult growth, the invasion by very dense populations may deeply change initially sandy or muddy benthic communities into similar “slipper limpet communities”. Competition for space eliminates several species of native infauna, and hampers the survival of some epibenthic bivalves such as the scallop Pecten...
Tipo: Text
Palavras-chave: Crepidula fornicata; Invasive species; Benthic gastropod; Colony model; Matching matrix; Pecten maximus; Competition; Population dynamics; Limit cycle.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00415/52601/53491.pdf

Dynamique des populations marines exploitées. Tome 1. Concepts et modèles
Provedor de dados: 5
Autores: Laurec, Alain; Le Guen, Jean-claude.
This book constitutes the first of a series of three volumes, the purpose of which is to cover the principal methods used in fish population dynamics. It is devoted to the definition of the main concepts, ami the presentation of the usual mathematical models. The second volume will deal with the fitting of the models, and the estimation of parameters. The third will be devoted to sampling problems. These volumes will be recollections of communications presented during ad hoc seminars, hold in Brest (GSG/COB) in 1980 and 1981. The first part deals with the basic concepts related to the two components whose relationship is being described by the population dynamics, namely the fish stock, to its relations with biological populations, and to the partition of...
Tipo: Text
Palavras-chave: Pêche; Conservation de la ressource; Modèle mathématique; Dynamique des populations; Gestion de stock; Resource conservation; Mathematical models; Fishery resources; Stock assessment; Population dynamics.
Ano: 1981
URL: https://archimer.ifremer.fr/doc/1981/rapport-1126.pdf

Crepidula fornicata L. (gastéropode) dans le bassin de Marennes-Oléron : structure, dynamique et production d'une population
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
The reproduction of Crepidula fornicata occurs from the end of February to October. This reproduction determines two periods of juvenile settlement, the first early in June and the second early in October.  Because of the lack of distinct cohorts, estimation of production and population dynamics was made according to the location of individuals in the chain. This was confirmed by the agreement between the growth rings of the shells and individual location in the chain. The main chain accounted for 80 per cent of individuals, the others being isolated or in collateral chains. The curvilinear growth of Crepidula fornicata in the bay of Marennes-Oléron follows the equation Le = 81.01 (1-e (-0.400 8(t-0,01)). The average yearly production from a population of...
Tipo: Text
Palavras-chave: Production; Marennes-Oléron; Crepidula fornicata; Dynamique de population; Population dynamics; Production; Marennes-Oléron; Crepidula fornicata.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/publication-2956.pdf

What can exploratory modelling tell us about the ecobiology of European sea bass (     Dicentrarchus labrax     ): a comprehensive overview
Provedor de dados: 5
Autores: Lopez, Romain; De Pontual, Helene; Bertignac, Michel; Mahevas, Stephanie.
European sea bass, Dicentrarchus labrax, is a highly valuable species in Europe, both for aquaculture in the Mediterranean Sea and for commercial and recreational fisheries in the North East Atlantic Ocean. Subjected to increasing fishing pressure, the wild population has recently experienced significant recruitment fluctuation as well as a northward extension of its distribution area in the North Sea. While the nature of the ecological and/or physiological processes involved remains unresolved, ontogenetic habitat shifts and adult site fidelity could increase the species’ vulnerability to climate change and overfishing. As managers look for expert information to propose management scenarios leading to sustainable exploitation, exploratory modelling...
Tipo: Text
Palavras-chave: Population dynamics; Essential habitats; Connectivity; Bioenergetic modeling; Phenotypic plasticity; Life cycle adaptation.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00341/45258/44699.pdf

Geographic variability of sardine dynamics in the Iberian Biscay region
Provedor de dados: 5
Autores: Silva, A.; Skagen, D. W.; Uriarte, A.; Masse, Jacques; Santos, M. B.; Marques, V.; Carrera, P.; Beillois, Pierre; Pestana, G.; Porteiro, C.; Stratoudakis, Y.
The spatio-temporal variability in the distribution, demographic structure, recruitment, and mortality of sardine within the Iberian Biscay region is described using area-disaggregated data collected during acoustic surveys and at ports since the mid-1980s. Multiple regression models were used to describe log numbers-at-age obtained annually in ten areas covered by three surveys to test the existence of geographic differences in selectivity-at-age, recruitment strength, and mortality and to infer plausible migration routes. Within Iberian waters, sardine biomass was mainly concentrated off western Portugal and the Gulf of Cadiz. In the Bay of Biscay, biomass levels were comparable with those off western Portugal. Recruitment was localized in a few areas...
Tipo: Text
Palavras-chave: Stock structure; Small pelagic fish; Population dynamics; Iberian Peninsula.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6459.pdf

Modelling and numerical simulations of larval migration of the sole (Solea solea (L.)) of the Bay of Biscay. Part 1: modelling
Provedor de dados: 5
Autores: Ramzi, Azeddine; Arino, Ovide; Koutsikopoulos, Constantine; Boussouar, Ahmed; Lazure, Pascal.
A spatio-temporal model describing the dynamics of a population of sole is presented. The model is an extension to a 2D-space structure of a 1D model published by the three first authors. Spatial migration is modelled by an advection-diffusion second order operator with constant coefficients. The physical domain is represented by a half-plane with the coast as its boundary. A formula for estimating the proportion of eggs reaching the juvenile stage, depending upon climatic, transport, growth and mortality processes, is derived. Numerical results are deferred to elsewhere.
Tipo: Text
Palavras-chave: Recruitment; Diffusion and advection processes; Population dynamics; Recrutement; Processus de diffusion et d'advection; Dynamique de population.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/2001/publication-531.pdf

A Bayesian state-space model to estimate population biomass with catch and limited survey data: application to the thornback ray (Raja clavata) in the Bay of Biscay
Provedor de dados: 5
Autores: Marandel, Florianne; Lorance, Pascal; Trenkel, Verena M.
The thornback ray (Raja clavata) in the Bay of Biscay is presumed to have declined during the 20th Century. To evaluate this decline and estimate biomass trajectories, a hypothetical catch time series was created for the period 1903-2013. A Bayesian state-space biomass production model with a Schaefer production function was fitted to the hypothetical catch time series and to a shorter research vessel Catch Per Unit Eeffort (CPUE) time series (1973-2013, with missing years). A censored likelihood made it possible to obtain biomass estimates without a CPUE time series or only with an estimate of biomass depletion. A simulation-estimation approach showed a high sensitivity of results to the prior for the intrinsic growth rate. The model provided biomass...
Tipo: Text
Palavras-chave: Population dynamics; Stock assessment; Data poor; Censored data; Bayes; Thornback ray; State-space model.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00359/47032/46947.pdf

Dynamique des populations de poissons.
Provedor de dados: 5
Autores: Daget, J.
The author explains that the population dynamics study, descriptive and explicative way, the changes which happen in the structure and the parameters (growth rate, sex ratio, fecundity, mortality etc.) of a monospecific population, by the use of mathematical models which permit prediction and simulation. If the fish population is not exploited, it is necessary to sample it directly and obtain samples representative of the demographical structure by experimental fishing (like electrical fishing) or by selectivity corrections. If the population is exploited, often the exploited phasis of the stock is only studied from samples representative of the whole captures. Now it happens that there is an important difference between the demographical structure of the...
Tipo: Text
Palavras-chave: Pisces; Catch statistics; Mathematical models; Population dynamics.
Ano: 1976
URL: http://archimer.ifremer.fr/doc/1976/publication-1999.pdf

Coastal phytoplankton community dynamics and coexistence driven by intragroup density-dependence, light and hydrodynamics
Provedor de dados: 5
Autores: Barraquand, F.; Picoche, C.; Maurer, Daniele; Carassou, L.; Auby, Isabelle.
Phytoplanktonic communities maintain a high diversity in a seemingly homogeneous environment, competing for the same set of resources. Many theories have been proposed to explain this coexistence despite likely competition, such as contrasted responses to temporal environmental variation. However, theory has developed at a faster pace than empirical evaluation using field data, which requires inferring drivers of community dynamics from observational time series. Here, we combine autoregressive models with a data set spanning more than 20 years of phytoplankton counts every two weeks, together with nutrients and physical variables. By comparing models dominated by nutrients or physical variables (hydrodynamics and climate), we first explore which abiotic...
Tipo: Text
Palavras-chave: Competition; Diatoms; Dinoflagellates; Hydrodynamics; Interactions; MAR; Mutualism; Network; Population dynamics; Seasonality; Time series.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00461/57257/59285.pdf

Dynamique des populations de palourdes japonaises (Ruditapes philippinarum) dans le bassin d'Arcachon : conséquences sur la gestion des populations exploitées
Provedor de dados: 5
Autores: Dang, Cecile.
The Manila clam Ruditapes philippinarum was introduced into Arcachon Bay at the beginning of the 1980s for aquaculture purposes. It rapidly naturalized in all intertidal flats of the lagoon. Nowadays, Arcachon Bay ranks at the first French place in terms of exploitable stock. However, recent stock assessments have shown an unbalance size structure with a deficit in juvenile and adult clams (&gt; 38 mm shell length). These alarming patterns asked many questions on the sustainability of Manila clam populations within Arcachon Bay and have motivated the present thesis. This study aimed to better understand the population dynamics of this species and also some factors controlling this dynamic. The final objective was to improve the Manila clam fishing...
Tipo: Text
Palavras-chave: Management; Trophic sources; Pathogens; Population dynamics; Ruditapes philippinarum; Gestion; Resources trophiques; Pathogènes; Dynamique de population; Ruditapes philippinarum.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/these-7382.pdf

Relations entre l’état d’une ressource et son exploitation via la compréhension et la formalisation des interactions de socio-écosystèmes. Application à la palourde japonaise (Venerupis philippinarum) du bassin d’Arcachon.
Provedor de dados: 5
Autores: Caill-milly, Nathalie.
Significant component of the marine benthic ecosystem, exploited bivalves are mainly located inside the coastal area, which temporal and spatial features generate natural population fluctuations and contribute to considerable biomass and demographic structure changes added to anthropogenic activities’ effects (fishing, pollution,…). Understanding of the relationships between the species, its environment and its exploitation is crucial and their formalization, including for management purposes, requires development of mathematical models that aim at describing the functioning of the system, to explain the observed phenomenon in terms of cause and effect or predict effects of new causes. Originating from venerid culture trials carried out in France in the...
Tipo: Text
Palavras-chave: Bivalve; Morphométrie; Allométrie; Dynamique des populations; Système dynamique; Gestion; Palourde japonaise; Venerupis philippinarum; Bivalve; Morphometry; Allometry; Population dynamics; Dynamic system; Management; Manila clam; Venerupis philippinarum.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00139/25034/23143.pdf

Les pêcheries de buccin (Buccinum undatum L. : Gastropoda) du Golfe Normand-Breton. Eléments de gestion de la ressource
Provedor de dados: 5
Autores: Santarelli Chaurand, Leonardo.
The whelk (Buccinum undatum) fisheries in the gulf between Brittany and Normandy have grown quickly over the past ten years. In 1983, 35 potters and 14 dories from Granville harbour and the Blainville maritime station landed 3,900 tonnes of whelk (for a value of 7.5 million francs). In spite of a sharp drop in profitability, the number of fishers is still growing. This study aimed to provide decision-making elements for rational management of the resource : stock abundance, catches per unit effort, mortality due to fishing effort and biological properties.   In order to assess the impact of measures to organise the fishing effort on total catches in balance, two predictive models were used: Pella and Tomlinson's generalised production model and Ricker's...
Tipo: Text
Palavras-chave: Bio economic modelling; Sampling; Population dynamics; Stock management; Mollusc; Modélisation bioéconomique; Echantillonnage; Dynamique de populations; Gestion de stocks; Mollusque.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/these-1203.pdf

Peche de l'anchois (Engraulis encrasicholus ) dans le golfe de Gascogne et sur le littoral atlantique de Galice depuis 1920. Variations quantitatives.
Provedor de dados: 5
Autores: Junquera, Susana.
Using the fishing records from the most relevant ports of the Cantabrian and Galician coasts, th history of the anchovy (Engraulis encrasicholus ) fishery in this area is reconstituted. The crisis observed and the variations in the fishing areas throughout the time are analyzed. An estimation of the age classes composition in the catches founded on commercial classification data can be made. The hypothesis of existence of a core population in the Southern part of the Bay of Biscay is presented and that only under certain advantageous condition the expansion of this species throughout all the Cantabrian Sea was possible.
Tipo: Text
Palavras-chave: Pisces; Age composition; Population dynamics; Catch/effort; Fishery statistics.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-1795.pdf

Impact of the reproduction dynamics on genetic variation in the European flat oyster Ostrea edulis
Provedor de dados: 5
Autores: Lapegue, Sylvie; Taris, Nicolas; Lallias, Delphine; Bonhomme, Francois; Boudry, Pierre.
The European flat oyster (Ostrea edulis L.) is a marine bivalve whose natural geographical distribution ranges along the European Atlantic coast from Norway to Morocco, in addition to the Mediterranean and Black Sea. The latest results obtained on the genetic differentiation between these populations have led us to pursue studies at a finer scale, in order to estimate the effective number of breeders and the temporal dynamics of reproduction and, more specially, recruitment. Several experiments were performed to document (1) the variance in allele frequencies during a natural settlement period; (2) the paternal contribution to fertilization by analyzing larvae sampled at the brooding stage within individual females; (3) the variance of individual...
Tipo: Text
Palavras-chave: Ostrea edulis; Oyster; Sexual reproduction; Population dynamics; Oyster culture; Inbreeding; Heterosis; Genetic isolation; Genetic diversity; Breeding success; Biological fertilization.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-3436.pdf

Does the concept of spawning per recruit make sense?
Provedor de dados: 5
Autores: Rochet, Marie-joelle.
Density dependence means that exploited fish populations exhibit earlier maturity, a faster growth rate, increased fecundity and reduced egg size. Here, the consequences of these effects on population dynamics, the estimation of spawning biomass per recruit and associated biological reference points are examined by a simulation model. The model is a self-regenerating model in which the population parameters (age at maturity, growth, fecundity, egg size) vary according to three classes of population abundance. Early life stages are characterized by a size-dependent growth and mortality model. It is concluded that spawning per recruit is an ambiguous concept because, if density dependence occurs in the adult population, the spawning biomass of a cohort is...
Tipo: Text
Palavras-chave: Teleost fishes; Population dynamics; Life history; Density dependence; Biological reference points.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-485.pdf

The collapse and recovery potential of carbon sequestration by baleen whales in the Southern Ocean
Provedor de dados: 5
Autores: Durfort, Anaelle; Mariani, Gael; Troussellier, Marc; Tulloch, Vivitskaia; Mouillot, David.
Limiting climate warming below 2°C requires both reducing anthropic greenhouse gas emissions and sequestering more atmospheric carbon. Natural Climate Solutions (NCS) rely on the ability of ecosystems to capture and store carbon. Despite the important role of marine megafauna on the ocean carbon cycle, its potential as a NCS has not yet been explored. Here, we quantify the amount of carbon potentially sequestered by five baleen whale species across the Southern Hemisphere between 1890 and 2100 through both the sinking of carcasses after natural death and the fertilisation of phytoplankton by nutrients in faeces. At their pre-exploitation abundances, the five whales could sequester 10.6 106 tonnes of carbon per year (tC.yr-1) but this natural carbon sink...
Tipo: Text
Palavras-chave: Natural Climate Solutions; Climate change; Population dynamics; Modelling; Krill.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00682/79434/82038.pdf

Biologie et pêche traditionnelle des crevettes pénéides dans l'embouchure d'un fleuve en milieur semi-aride (sud-ouest de Madagascar)
Provedor de dados: 5
Autores: Laroche, Jean; Benoely,; Siaviri, A.
Traditional fishing using beach seines was studied over a period of one year at the mouth of the Onilahy river. The catches/efforts were recorded on a daily basis, biological sampling and the measurement of hydrological parameters being carried out twice a month. The moderate variations of salinity and temperature (14 &lt; salinity &lt; 35; 25 degrees C &lt; temperature &lt; 30 degrees C) which were observed in the estuary can be explained by the semiarid climate of the area. Four species of penaeid shrimps are to be found on the Onilahy: Metapenaeus monoceros, Panaeus indicus, Penaeus monodon and Penaeus japonicus, which were mainly caught at the subadult/adult stage with a Carapace length between 10 and 50 mm. The presence of these important sizes at the...
Tipo: Text
Palavras-chave: Pêche; Estuaire; Dynamique population; Croissance; Taille corporelle; Cycle évolutif; Zone semi aride; Madagascar; Penaeus japonicus; Penaeus monodon; Penaeus indicus; Metapenaeus monoceros; Rivière Onilahy; Afrique; Milieu saumâtre; Macrura; Decapoda; Crustacea; Arthropoda; Invertebrata; Fishing; Estuaries; Population dynamics; Growth; Body size; Life history; Semi arid zone; Malagasy Republic; Penaeus japonicus; Penaeus monodon; Penaeus indicus; Africa; Brackish water environment; Macrura; Decapoda; Crustacea; Arthropoda; Invertebrata.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00097/20828/42822.pdf

Atlantic bluefin tuna: population dynamics, ecology, fisheries and management
Provedor de dados: 5
Autores: Fromentin, Jean-marc; Powers, Joseph.
Both old and new information on the biology and ecology of Atlantic bluefin tuna have confronted scientists with research challenges: research needs to be connected to current stock-assessment and management issues. We review recent studies on habitat, migrations and population structure, stressing the importance of electronic tagging results in the modification of our perception of bluefin tuna population dynamics and behaviour. Additionally, we question, from both scientific and management perspectives, the usefulness of the classical stock concept and suggest other approaches, such as Clark's contingent and metapopulation theories. Current biological information confirms that a substantial amount of uncertainty still exists in the understanding of...
Tipo: Text
Palavras-chave: Tuna fisheries; Thunnus thynnus; Stock assessment and management; Population structure; Population dynamics; Atlantic bluefin tuna.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-797.pdf

Crise de la production des coques (Cerastoderma edule ) en baie de Somme. 2. Impact de la dynamique biosedimentaire.
Provedor de dados: 5
Autores: Ducrotoy, J; Desprez, M; Elkaim, B.
The recent collapse in the landings of cockles (Cerastoderma edule) from the Bay of Somme (France) required to investigate if a change in the environmental factors was liable for the drop of the bivalve populations. This project has led to a preliminary assessment of the situation and has been drawn up from the data collected by the Groupe d'Etude des Milieux Estuariens et Littoraux since 1978. It relies on the survey of the spatio-temporal changes of bio-facies. it is suggested that the impact of changes in sediment characteristics is important as well as competition with species as Pygospio elegans (Polychaeta). The above parameters are assessed as essential in the fluctuations of the cockle numbers but they do not explain entirely the collapse in the...
Tipo: Text
Palavras-chave: Landing statistics; Clam fisheries; Stock assessment; Population dynamics; Marine mollusks.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/publication-1784.pdf

Linking basin-scale connectivity, oceanography and population dynamics for the conservation and management of marine ecosystems
Provedor de dados: 5
Autores: Dubois, Melodie; Rossi, Vincent; Ser-giacomi, Enrico; Arnaud-haond, Sophie; Lopez, Cristobal; Hernandez-garcia, Emilio.
Aim  Assessing the spatial structure and dynamics of marine populations is still a major challenge in ecology. The need to manage marine resources from ecosystem and large-scale perspectives is recognized, but our partial understanding of oceanic connectivity limits the implementation of globally pertinent conservation planning. Based on a biophysical model for the entire Mediterranean Sea, this study takes an ecosystem approach to connectivity and provides a systematic characterization of broad-scale larval dispersal patterns. It builds on our knowledge of population dynamics and discusses the ecological and management implications. Location  The semi-enclosed Mediterranean Sea and its marine ecosystems are used as a case study to investigate broad-scale...
Tipo: Text
Palavras-chave: Larval dispersal; Local retention; Marine connectivity; Marine ecosystems; Marine protected areas; Mediterranean Sea; Population dynamics; Population genetics; Self-recruitment; Source; Sink dynamics.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00311/42201/41534.pdf

Detecting changes in diversity in a fluctuating environment based on simulation of stochastic processes
Provedor de dados: 5
Autores: Diserud, Oh.
In this paper, I present a method developed to detect 'extra', or novel, changes in diversity in a naturally fluctuating environment. When comparing samples in order to evaluate changes in community structure, the sampling procedure will inevitably induce randomness in observed species composition and abundance, so two samples may show considerable differences, even if they come from exactly the same community. Sometimes the effort put into the sampling varies as well, leading to the expectation of a further increase in difference. Finally, if there were a temporal distance between the samples, we would like to correct for variations in species abundance occurring naturally due to fluctuating environmental conditions. The test method presented here...
Tipo: Text
Palavras-chave: Structure des communautés; Diversité; Variance environnementale; Dynamique des populations; Modèle d'abondance d'une espèce; Community structure; Diversity index; Environmental variance; Population dynamics; Species abundance model.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43345/42881.pdf

Eastern Atlantic bluefin tuna: what we learn from historical time-series of trap catches
Provedor de dados: 5
Autores: Ravier, Christelle; Fromentin, Jean-marc.
More than one hundred long-term time-series of bluefin tuna catches from the ancestral Mediterranean and Atlantic trap fisheries are used to (1) estimate historical range of BFT yields in the Mediterranean and adjacent Atlantic and (2) investigate spatial and temporal patterns of fluctuations in trap catches. Mean historical catches were around 110 000 tunas/year (± 50 000), i.e. 15 000 tons/year (∈[7 000;25 000]). Fluctuations in trap catches are of large magnitude, periods of high abundance being up to seven times higher than those of low abundance. More interesting was the occurrence of 100-year-long periodic fluctuations as well as 20-year cycles. These medium- to long-term fluctuations, representing more than 50% of the total variability in the...
Tipo: Text
Palavras-chave: Thunnus thynnus; Time series analyses; Abundance; Population dynamics; Long-term changes; Trapfishing.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00194/30497/28906.pdf

Can fisheries-induced evolution shift reference points for fisheries management?
Provedor de dados: 5
Autores: Heino, Mikko; Baulier, Loic; Boukal, David S.; Ernande, Bruno; Johnston, Fiona D.; Mollet, Fabian M.; Pardoe, Heidi; Therkildsen, Nina O.; Uusi-heikkila, Silva; Vainikka, Anssi; Arlinghaus, Robert; Dankel, Dorothy J.; Dunlop, Erin S.; Eikeset, Anne Maria; Enberg, Katja; Engelhard, Georg; Jorgensen, Christian; Laugen, Ane; Matsumura, Shuichi; Nussle, Sebastien; Urbach, Davnah; Whitlock, Rebecca; Rijnsdorp, Adriaan D.; Dieckmann, Ulf.
Biological reference points are important tools for fisheries management. Reference points are not static, butmay change when a population's environment or the population itself changes. Fisheries-induced evolution is one mechanism that can alter population characteristics, leading to "shifting" reference points by modifying the underlying biological processes or by changing the perception of a fishery system. The former causes changes in "true" reference points, whereas the latter is caused by changes in the yardsticks used to quantify a system's status. Unaccounted shifts of either kind imply that reference points gradually lose their intended meaning. This can lead to increased precaution, which is safe, but potentially costly. Shifts can also occur in...
Tipo: Text
Palavras-chave: Biological reference points; Fisheries-induced evolution; Fisheries management; Population dynamics; Precautionary approach; Uncertainty.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00151/26228/24302.pdf

Fluctuations à long terme du thon rouge: validité, origines et conséquences
Provedor de dados: 5
Autores: Ravier, Christelle.
Describe and gain understanding on fluctuations in animal population over time and space is a central goal of population ecology. This is also crucial to ensure the sustainable management of exploited resources, particularly those with complex population dynamics such as the bluefin tuna. The goal of this work is to collect bluefin tuna catches from the ancestral Mediterranean and Atlantic trap fisheries to (i) characterise long-term fluctuations in bluefin tuna population migrating in the Mediterranean, (ii) analyse their causes et (iii) assess their implications for fisheries management.  The bluefin tuna main biological and ecological characteristics are first detailed. Then, the first part presents the trap fishery, and the process of collect and...
Tipo: Text
Palavras-chave: Biological reference point; V.p.a.; Management; Migration; N.a.o.; Temperature; Tunas/environment relationships; Population dynamics; Periodic fluctuations; Long term trend; Time series; East Atlantic; Mediterranean Sea; Trap fishery; Thunnus thynnus; Points biologiques de référence; V.p.a.; Modèle global; Migration; N.a.o.; Température; Relation thon/environnement; Dynamique de population; Fluctuations périodiques; Tendances à long terme; Séries temporelles; Atlantique Est; Méditerranée; Madrague; Thunnus thynnus.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/these-65.pdf

Long-term studies of Littorina obtusata and Littorina saxatilis populations in the White Sea
Provedor de dados: 5
Autores: Sergievsky, So; Granovitch, Ai; Sokolova, Im.
The results of a 14-year survey of the populations of L. saxatilis and L. obtusata from one locality in the Kandalaksha Bay of the White Sea are presented. The periwinkles were found to be hosts of 10 castrating trematode species. Microphallus piriformes was the most abundant species with infection prevalence often exceeding 50%. Year-to-year variation of the infection prevalence was correlated in the two host species, probably reflecting fluctuations in the influx of trematode eggs to the shore. Long-term changes in population density are associated with the variation of the age structure of the winkles, suggesting a dependence of the population density on the success of the recruitment. Fluctuations in abundance and age composition were correlated in L....
Tipo: Text
Palavras-chave: Long-term; Population dynamics; Demography; Littorina; Trematoda.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20395/18062.pdf

Crise de la production des coques (Cerastoderma edule ) en baie de Somme. 1. Synthese des connaissances biologiques.
Provedor de dados: 5
Autores: Desprez, M; Ducrotoy, J; Elkaim, B.
In this paper, the results collected since 1978 on the cockle (Cerastoderma edule) in the Bay of Somme have been recapitulated. A synthesis is brought up about causes of the bivalve population collapse which was portended as early as 1982 from the animal cinetics study. In order to back up the discussion, the main results dealing with the biology and ecology of the species are recalled in illustrated form. A review of the international literature leads to a comment upon the diagrams. A comparison with data from European estuaries tends to take climatic and oceanic disturbances into account as well as local pollution such as eutrophication which is probable on the littoral of Picardy.
Tipo: Text
Palavras-chave: Clam fisheries; Stock assessment; Recruitment; Population dynamics; Marine mollusks.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/publication-1783.pdf

Modelling and numerical simulations of larval migration of the sole (Solea solea (L.)) of the Bay of Biscay. Part 2: numerical simulations
Provedor de dados: 5
Autores: Ramzi, Azeddine; Arino, Ovide; Koutsikopoulos, Constantine; Boussouar, Ahmed; Lazure, Pascal.
This paper is the second part of a work on the modelling of larval migration and growth fur the sole of the Bay of Biscay (Solea solea (L.)). The goal of the paper is twofold: first of all, it aims at presenting a numerical application of the formulae (concerning the recruitment rate) elaborated in the first paper. Results show a high sensitivity with respect to some parameters. Then, a comparison is made with a numerical model using a 3D circulation model provided by Ifremer.
Tipo: Text
Palavras-chave: Recruitment; Diffusion and advection processes; Population dynamics; Recrutement; Avection; Processus de diffusion; Dynamique de population.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/2001/publication-532.pdf

Small pelagic fish dynamics: a review of mechanisms in the Gulf of Lions
Provedor de dados: 5
Autores: Saraux, Claire; Van Beveren, Elisabeth; Brosset, Pablo; Queiros, Quentin; Bourdeix, Jean-herve; Dutto, Gilbert; Gasset, Eric; Jac, Cyrielle; Bonhommeau, Sylvain; Fromentin, Jean-marc.
Around 2008, an ecosystem shift occurred in the Gulf of Lions, highlighted by considerable changes in biomass and fish mean weight of its two main small pelagic fish stocks (European anchovy, Engraulis encrasicolus; European sardine, Sardina pilchardus). Surprisingly these changes did not appear to be mediated by a decrease in fish recruitment rates (which remained high) or by a high fishing pressure (exploitation rates being extremely low). Here, we review the current knowledge on the population's dynamics and its potential causes. We used an integrative ecosystem approach exploring alternative hypotheses, ranging from bottom-up to top-down control, not forgetting epizootic diseases. First, the study of multiple population characteristics highlighted a...
Tipo: Text
Palavras-chave: Population dynamics; Top-down; Disease; Zooplankton; Exploited species; Bottom-up.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00427/53861/54903.pdf

Exploitation, biologie et dynamique du stock de langouste rouge de Corse, Palinurus elephas Fabricius
Provedor de dados: 5
Autores: Marin, Jean.
The European red spiny lobster (Palinurus elephas) is the main target species of the small-scale fishery in Corsica. This fishery was described, its trends from 1981 to 1964 were analysed, and the exploitation conditions of the spiny lobster stock (fishing grounds, strategy and gear ; fishing regulations) were explained. Furthermore, the fishing effort and the yields were estimated through an indirect survey, in 1983 and 1984 . The growth was studied through tagging experiments. Growth increment per moult, Von BERTALANFFY's equation parameters, and moulting frequency were estimated for both sexes. Bias risks associated to tag loss at moulting were also analysed. In addition, estimates of K and L&amp;#8734; variances were provided through "Jack-knife"...
Tipo: Text
Palavras-chave: Palinurus elephas; Fishery biology; Population dynamics; Fecundity; Recruitment; Sexual maturity; Growth; Stock assessment; Sensibilité; Fécondité par recrue; Rendement par recrue; Analyse des cohortes; Maturité sexuelle; Croissance; Pêcherie; Langouste.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/these-1036.pdf

Modélisation biophysique pour la prévision du recrutement
Provedor de dados: 5
Autores: Allain, Gwenhael.
Exploited fish populations are dependent on recruitment (i.e. size of the new year class) to sustain their abundance. Recruitment variations are related to hydroclimatic variations and may accentuate the detrimental effects of fishing. Recruitment prediction requires accurate fisheries oceanographic tools, which are expected to be more reliable than large-scale correlation analyses between fish abundance and climate variables.  Recruitment is the result of the integration over a season and large oceanic areas of processes affecting larval survival, which are dependent on small-scale mechanisms. Hydrodynamic models are a tool to perform this integration. This thesis aims at exploring and modelling physical-biological interaction mechanisms in order to...
Tipo: Text
Palavras-chave: Anchovy; Upwelling; Turbulence; Retention; Fisheries management; Population dynamics; Stock environment interaction; Stock recruitment relation; Scale integration; Individual based models; Survival; Growth; Otolith; Physical biological interactions; Prediction; Recruitment; Turbulence; Rétention; Méso échelle; Intégration des échelles; Modèle de survie; Modèle de ponte; Modèles individu centrés; Modèles de corrélation; Modèles stochastiques; Juvéniles; Larves; Otolithe; Modèle de croissance; Interactions physique biologie; Prévision; Recrutement.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/these-5.pdf

Le controle chimique et biologique de Lymnaea truncatula Mueller. Etude des effets a long terme
Provedor de dados: 5
Autores: Rondelaud, D.
The treated habitats have not been recolonized by Lymnaea truncatula . Four aquatic snail species showed an increase in their numbers: L. glabra in the stations of Haute-Vienne, L. glabra, Physa acuta, P. hypnorum and Planorbis rotundatus in the habitats of Indre. The numbers of L. glabra and P. acuta reached their maximum on the third year and decreased thereafter; those of P. hypnorum and P. rotundatus slightly increased from the fourth or the fifth years treatment. The colonization of L. truncatula habitats was incomplete and did not reach over 50% of the surface for L. glabra and P. acuta , 20% for P. hypnorum and P. rotundatus . The bivalve Pisidium casertanum did not recolonize treated habitats. There were no modifications in the numbers of...
Tipo: Text
Palavras-chave: Physa; Lymnaea; Mollusca; Biological control; Chemical control; Population density; Population dynamics; Freshwater molluscs.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1715.pdf

Premieres donnees sur la dynamique du peuplement macrobenthique des sables fins envases a Abra alba de la Baie de Seine orientale
Provedor de dados: 5
Autores: Gentil, F; Irlinger, J; Elkaim, B; Proniewski, F.
The dynamics of macrobenthos populations living in muddy fine sands near Seine estuary have been studied, to obtain quantitative data for the knowledge of these populations and the impact of macrotidal environment disturbances.
Tipo: Text
Palavras-chave: Seasonal variations; Population density; Population number; Ecosystem disturbance; Environmental effects; Population dynamics; Zoobenthos.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1309.pdf

Food limitation and low-density populations of sympatric hamster species in North China
Provedor de dados: 16
Autores: Xiong, W.; Liang, H.; Yu, X.; Cong, L.; Zhang, Z.
Although food has been proposed as a possible factor on population regulation of small mammals, evidence of food restriction in field conditions is still lacking. Food restriction is generally thought to occur in high-density years of oscillating populations of small mammals. By using two body condition indices (muscle protein concentration and cleaned carcass index), we investigated variations of body condition of the greater long-tailed hamster (Tscherskia triton) and the striped hamster (Cricetulus barabensis) in the Raoyang County of the North China Plain during a population decline- and low-phase from 1998 to 2003. Our laboratory experiments showed that food restriction reduced muscle protein concentration and cleaned carcass index of greater...
Tipo: Article / Letter to the editor
Palavras-chave: Body condition; Cricetulus barabensis; Density-dependent food restriction; Population dynamics; Tscherskia triton; 42.84.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/311810

Body size, symmetry and abundance of Euxesta stigmatias (Loew) and Euxesta sororcula (Wiedemann) (Diptera: Ulidiidae) in a natural reserve and in a guava orchard in Uberlândia, MG, Brazil
Provedor de dados: 82
Autores: Souto,KCFL; Pereira,CD; Lomônaco,C.
The aim of this study was to comparatively characterize the monthly variation and the sex ratio of Euxesta stigmatias (Loew) and Euxesta sororcula (Wiedermann) populations from a natural reserve and from a guava orchard. It was also investigated whether density and the climate factors affected the individuals' size and fluctuating asymmetry (FA). In both environments, E. sororcula predominated over E. stigmatias. The number of individuals of E. sororcula collected in the ecological station was significantly lower than the number of individuals caught in the orchard. However, the number of captured individuals of E. stigmatias did not differ between environments. Significant sex ratio differences were detected between the collection sites. Female's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fluctuating asymmetry; Morphometry; Population dynamics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000600005

Effect of Host Plant on the Fecundity of Spittlebug Deois flavopicta Stal (Homoptera: Cercopidae): Implications on Population Dynamics
Provedor de dados: 82
Autores: SUJJI,E.R.; PIRES,C.S.S.; FONTES,E.M.G.; GARCIA,M.A.
The spittlebug Deois flavopicta Stal (Hom.: Cercopidae) occurs naturally on native grasses in Central Brazil in low population densities. After the introduction of African grasses, mainly of the genus Brachiaria, for cattle raising, D. flavopicta began to produce population outbreaks and became a pest. Two studies were conducted, aiming to estimate the effects of a native and an exotic host plant on the fecundity of this insect. Females of D. flavopicta maintained during the adult stage on Brachiaria ruziziensis produced more eggs and lived longer than those maintained on Axonopus marginatus (a native grass widely distributed in Brazil), independently of the host plant on which the nymphs were reared. Due to the severe damage produced by adult D....
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Insecta; Population dynamics; Reproductive biology; Insect-plant interaction; Population outbreaks.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2001000400006

Seasonal fecundity and body size in Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae)
Provedor de dados: 82
Autores: Reigada,Carolina; Godoy,Wesley A.C.
In this study the seasonal variation of fecundity, wing and tibia size was investigated in natural populations of Chrysomya megacephala (Fabricius) aiming at determining the variations in life history of the species as a function of seasonality. A relative constant temporal trajectory was found for fecundity, wing and tibia size over twelve months. Strong positive correlations between wing size and temperature, tibia size and temperature and between wing and tibia sizes were observed. The implications of the results for population dynamics of C. megacephala were discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blowfly; Population dynamics; Muscomorpha; Seasonality; Bionomics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000200003

Predation as a Mortality Factor in Populations of the Spittlebug, Deois flavopicta Stål (Homoptera: Cercopidae)
Provedor de dados: 82
Autores: SUJII,EDISON R.; GARCIA,MARIA A.; FONTES,ELIANA M.G.; O'NEIL,ROBERT J.
The spittlebug, Deois flavopicta Stål, is the main pest in cultivated pastures of the "Cerrados" (savanna) in the central region of Brazil. The insect has three discrete generations during the rainy season (September-April) and a synchronized population of diapausing eggs during the dry season (May-August). Experiments in cultivated pastures showed that nonspecific predators were able to affect significantly the mortality rates of diapausing eggs and nymphs of D. flavopicta. Predation was a density independent mortality factor that reduced diapausing eggs by approximately 60% and nymphs by 20% to 47%. The nymph mortality rate due to predation did not differ during the first and the second generations of the year. For the third generation however, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Insect community; Population dynamics; Survival curve.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2002000400010

Allee effect in exotic and introduced blowflies
Provedor de dados: 82
Autores: Serra,H; Costa,Mis; Godoy,Wac.
We combined two models to investigate the theoretical dynamics of five exotic and native blowfly species in response to the Allee effect by using demographic parameters estimated from experimental populations. Most of the results suggest stabilization of dynamic behavior in response to the Allee effect. However, the results depended on the magnitude of the demographic parameters of each species, and also indicated chaotic fluctuations and limit cycles. The results are discussed in the context of larval aggregation, an important biological process for blowflies, which naturally incorporates the Allee effect.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calliphoridae; Ecological model; Population dynamics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000500001

Influência climática e antrópica na abundância e riqueza de Calliphoridae (Diptera) em fragmento florestal da Reserva Biológica do Tinguá, RJ
Provedor de dados: 82
Autores: Ferraz,Adriana C P; Gadelha,Bárbara Q; Aguiar-Coelho,Valéria M.
Monthly collections were made using two traps 5 m apart exposed for 48h, containing sardines and installed at points: A at the edge (500 m from the entrance of the Reserve); B 1200 m from the entrance and 1000 m inside the forest; and C 1700 m from the entrance and 500 m inside the forest. The purpose was to evaluate the abundance and richness of calliphorid species as a function of the environmental conditions using Pearson's correlation, compare the richness of the areas using ANOVA and Tukey's test, compare the abundances of the areas by the Kruskal-Wallis test, and also assess the possible influence of the anthropic presence. Rare, intermediary and common species were identified. The collection totalized 8515 Calliphoridae belonging to 26 species, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Population fluctuation; Muscoid.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000400004

Temperature-dependent development of the entomopathogenic fungus Nomuraea rileyi (Farlow) Samson in Anticarsia gemmatalis (Hübner) larvae (Lepidoptera: Noctuidae)
Provedor de dados: 82
Autores: Edelstein,Julio D.; Trumper,Eduardo V.; Lecuona,Roberto E.
The influence of temperature on the development rate of the entomopathogenic fungus Nomuraea rileyi (Farlow) Samson in Anticarsia gemmatalis (Hübner) 3rd-instar larvae was studied under constant temperature regimes. A non linear model was used to describe temperature-dependent vegetative and reproductive development rates of the fungus. The temperature required to reach the highest vegetative development rate was estimated to be 25.5ºC while lower and upper developmental thresholds were 11ºC and 30ºC, respectively. The rate of development for conidia release was stable from 18ºC to 26ºC. The estimated lower and upper thresholds of vegetative development coincide with conditions during the natural epizootics in central Argentina. Non-linear effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Mathematical model; Population dynamics; Natural enemy.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000400009

Photoperiodism and seasonality in neotropical population of Plutella xylostella L. (Lepidoptera: Yponomeutidae)
Provedor de dados: 82
Autores: Campos,Wellington G.
Neotropical populations of the diamondback moth Plutella xylostella L. have seasonal cycles of growth and decrease, and moth migration plays a fundamental role in generating such population dynamics. Since the oscillation of these populations is predictable, photoperiod might operate as a signal that triggers the migratory behaviour of the insect. Migration in insects is usually preceded by reproductive diapause, a photoperiodic response that can be characterised by morphological, physiological and behavioural alterations that permit to discriminate between migratory and non-migratory forms. In this study, I tested whether the pre-imaginal and reproductive development of P. xylostella from Minas Gerais (Brazil) is affected by artificial day-lengths that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Day-length; Diapause; Migration; Photoperiod; Population dynamics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000400003

A regional analysis of weather mediated competition between a parasitoid and a coccinellid predator of oleander scale
Provedor de dados: 82
Autores: Gutierrez,Andrew P.; Pizzamiglio,Marina A.
The regulation of an asexual population of the oleander scale [Aspidiotus nerii Bouchè (Hemiptera: Diaspididae)] on California bay tree [Umbellularia californica (Hopk. &amp;amp; Arn.) Nut.] by two natural enemies; an idiobiont, ectoparasitoid Aphytis chilensis Howard (Hymenoptera: Aphelinidae) and a coccinellid predator (Rhysobius lophanthae (Blaisd.) (Coleoptera: Coccinellidae), was examined using a general weather-driven, tri-trophic, physiologically based age-mass structured demographic model. The model is of intermediate complexity and was parameterized using extensive laboratory data and field observations from Albany, CA. Temperature-dependent physiological indices were estimated from the laboratory data and used to scale per capita growth,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GIS; Population dynamics; Olive; Physiologically based model.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000100009

Iheringichthys labrosus (Siluriformes: Pimelodidae) in the Piquiri River, Paraná, Brazil: population structure and some aspects of its reproductive biology
Provedor de dados: 83
Autores: Holzbach,Arlei J.; Gubiani,Éder A.; Baumgartner,Gilmar.
The purpose of this study was to analyze the population structure (spatial and temporal distribution, sex ratio, length distribution and length/weight relationship) and reproductive biology of Iheringichthys labrosus. This species is of importance as fisheries resource in the Paraná River basin. Fish were sampled, bimonthly, with gill and trammel nets at three sampling sites (Campina, Apertado and Altônia), located in the Piquiri River, between November 2002 and September 2003. In this study, 164 individuals were collected; the largest capture occurred in Campina site, with 209.88 individuals/1000 m² of net for 24 hours, while the shift of largest capture was night time (N) and the month was July. Females occurred in larger numbers than males in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish reproduction; Population dynamics; Upper Paraná River; Tributary.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100008

Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Provedor de dados: 83
Autores: Ribeiro,Thiago Cotta; Villalobos,Gerardo Umaña.
Fish monthly samples were made in three tributaries and in the main stream in order to study population dynamics and the influence of flow on abundance of Agonostomus monticola (Mugilidae) and Brycon behreae (Characidae) in the basin of Térraba River Basin (Costa Rica). Flow was seasonal in these rivers, with peak flow in October. Recruitment was different among the species, B. behreae recruited from January to June and A. monticola all year round with a peak in June-July and October-November. Juveniles were more abundant in smaller streams. Abundance was higher in general during low flow and low turbidity periods. The results suggest that the streams have an important role in the maintenance of both species in the ecosystem, where juveniles can use the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Fish recruitment; Environment conservation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400014

Evaluation des stocks et aménagement des pêcheries de la ZEE mauritanienne
Provedor de dados: 20
Autores: Diop, M.; Inejih, C.A.O.; Tous, P.; Failler, P.; Dia, M.A.
Le cinquième groupe de travail destiné à l’évaluation des stocks et l’aménagement des pêcheries de la zone économique exclusive mauritanienne s’est réuni à l’Institut Mauritanien de Recherches Océanographiques et des Pêches (IMROP) du 9 au 17 décembre 2002. Les objectifs de ce groupe de travail étaient d’actualiser les résultats des groupes de travail précédents, en utilisant les nouvelles informations disponibles ; d’établir un diagnostic des différents stocks et pêcheries afin de définir les potentiels de capture ainsi que les caractéristiques de l’effort permissible et d’évaluer l’impact des mesures d’aménagement actuellement en vigueur et identifier les perspectives à venir. Les résultats obtenus ont contribué à la formulation de recommandations...
Tipo: Journal Contribution
Palavras-chave: Artisanal fishing; Catch composition; Catch statistics; Catch/effort; Cephalopod fisheries; Coastal fisheries; Demersal fisheries; Economic analysis; Environmental conditions; Fishery economics; Fishery management; Fishing effort; Fishing fleet; Landing statistics; Marine environment; Overfishing; Pelagic fisheries; Population dynamics; Prices; Quality assurance; Quality control; Research institutions; Research vessels; Seasonal distribution; Seasonal variations; Shrimp fisheries; Socioeconomic aspects; Upwelling; Demersal fisheries; Economic analysis; Fishery management; Marine environment; Prices; Research vessels; Catch composition; Coastal fisheries; Environmental conditions; Fishing effort; Overfishing; Pelagic fisheries; Population dynamics; Quality assurance; Research institutions; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_2469; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_6178; Http://aims.fao.org/aos/agrovoc/c_6516; Http://aims.fao.org/aos/agrovoc/c_1384; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_35287; Http://aims.fao.org/aos/agrovoc/c_6514.
Ano: 2005
URL: http://hdl.handle.net/1834/1322

Caractères biométriques de la squille squilla mantis dans les eaux tunisiennes
Provedor de dados: 20
Autores: Mili, S.; Jarboui, O.; Missaoui, H.
Pour l’étude biométrique de la squille Squilla mantis, un échantillonnage régulier a été réalisé dans le golfe de Tunis, le golfe de Hammamet et le golfe de Gabès de janvier 2005 à décembre 2006. Les équations morphométriques de la squille, dans le golfe de Gabès, ont montré que la croissance relative du telson, celle de la masse totale et celle de la masse éviscérée par rapport à celle du céphalothorax sont caractérisées par une allométrie positive. Par contre, la longueur totale croît négativement par rapport à celle du céphalothorax. Pour le golfe de Hammamet, ces caractères ont une croissance marquée par une allométrie négative à part la masse éviscérée. Les équations morphométriques de la squille du golfe de Tunis ont montré une allométrie positive...
Tipo: Journal Contribution
Palavras-chave: Biometrics; Comparative studies; Population dynamics; Population structure; Statistical analysis; Squilla mantis; Http://aims.fao.org/aos/agrovoc/c_46197.
Ano: 2008
URL: http://hdl.handle.net/1834/4241

Synthèse des donneés sur la pêche artisanale aux Seychelles: Biologie - ressources - exploitation
Provedor de dados: 20
Autores: de Moussac, G.
Le present rapport resume et synthetise les donnees des principales publications concernant la biologie des peches artisanales aux Seychelles, depuis 1912, en particulier les rapports des prospections et de statistiques de  peche.           Une premiere partie presente les donnes biologiques acquises aux Seychelles {sensu strioto) sur quelques 58 especes de poissons. Certains resultats non publies (principalement proposes par l'auteur) sont egalement inclus dans ce chapitre. La seconde partie traite des donnes biologiques sur les ressources marines vivantes, autre que les poissons, a savoir les crustaces, les coquillages et les algues.                                     Le troisieme chapitre resume les resultats concernant les quantifications des...
Tipo: Report
Palavras-chave: Finfish fisheries; Fishery statistics; Population dynamics; Biological data; Stock assessment; Shellfish fisheries; Oyster fisheries.
Ano: 1988
URL: http://hdl.handle.net/1834/5126

Análisis de la distribución y dinámica poblacional de lenguados de la Provincia de Buenos Aires (Pisces, Bothidae)
Provedor de dados: 20
Autores: Fabré, N.N.
Los lenguados constituyen un importante recurso pesquero en el Mar Argentino. Más que en los volúmenes desembarcados (9 .731 t en 1991), esta importancia se centra en su elevado valor de comercialización debido a la alta calidad de su carne. Atendiendo a los desembarques totales realizados en el Mercado de Concentración Pesquera de Mar del Plata, los lenguados ocupan el octavo lugar. Estos desembarques están compuestos principalmente por especies de porte mediano a grande pertenecientes al género Paralichthys, y por ejemplares de tamaño mediano o pequeño de las especies Xystreuris rasile, y en menor proporción, Paralichthys isosceles. Este recurso es explotado, en el sector bonaerense, por las flotas de rada o ría y costera, mientras que la flota de altura...
Tipo: Theses and Dissertations
Palavras-chave: Geographical distribution; Population dynamics; Population structure; Growth; Reproduction; Mortality; Environmental effects; Ecosystems; Marine fish.
Ano: 1992
URL: http://hdl.handle.net/1834/5158

Magellanic penguin (Spheniscidae) monitoring results for Magdalena Island (Chile) 2000 - 2008
Provedor de dados: 20
Autores: Herrmann, Thora M.; Bingham, Mike.
Magellanic penguins (Spheniscus magellanicus) are only found around southern South America, with breeding populations in Chile, Argentina and the Falkland Islands (Malvinas). One of Chile’s largest and most important Magellanic penguin breeding sites is situated on Magdalena Island in the Straits of Magellan. The island has been designated a national nature reserve because of its importance as a penguin breeding site, and the reserve is managed by the government agency Corporación Nacional Forestal. The island is a popular tourist destination, and Magellanic penguins are increasingly exposed to human activities. In order to protect this seabird and to ensure the sustainable use of the reserve as a tourist resource, Magdalena Island has been part of a...
Tipo: Journal Contribution
Palavras-chave: Monitoring; Population dynamics; Breeding success; Disturbance (ecosystem); Human impact; Marine birds; Spheniscidae; Http://aims.fao.org/aos/agrovoc/c_49183.
Ano: 2008
URL: http://hdl.handle.net/1834/4172

Biologie et exploitation du poulpe Octopus vulgaris (Cuvier, 1797) des côtes mauritaniennes
Provedor de dados: 20
Autores: Dia, M.A.
L’étude porte sur l’exploitation, la biologie et la dynamique du poulpe (Octopus vulgaris, Cuvier) des eaux mauritaniennes. La répartition spatio-temporelle dans la région du Cap Blanc ne semble être liée ni à la taille, ni au sexe, mais varie au cours de l’année. L’analyse de l’état actuel de la pêcherie basée sur les congélateurs céphalopodiers met en évidence une augmentation de l’effort de pêche et la poursuite de chute des p.u.e. La composition des captures révèle une progression du pourcentage des individus de poids inférieur à 200 grammes (« poulpo »). L’étude biologique montre qu’il existe deux saisons de reproduction par an (mai-juillet et septembre-novembre) qui engendrent deux recrutements, l’un en mai et l’autre à partir de septembre. La...
Tipo: Theses and Dissertations
Palavras-chave: Reproduction; Common octopus; Population dynamics; Environnement; Dynamique de population; Exploitation; Environment; Poulpe; ZEE Mauritanienne; Distribution; Mauritanian EEZ; Biologie; Croissance; Growth; Octopus vulgaris; Biology; Octopus fisheries.
Ano: 1988
URL: http://hdl.handle.net/1834/675

Dinámica poblacional del chivo mapale Cathorops spixii en la Ciénaga Grande de Santa Marta y Complejo de Pajarales, Caribe colombiano
Provedor de dados: 20
Autores: Tíjaro, R.; Rueda, M.; Santos-Martínez, A.
Durante 1994 el chivo mapalé (Cathorops spixii) fue el segundo recurso pesquero más abundante en la Ciénaga Grande de Santa Marta y el Complejo de Pajarales, principal sistema laguno-estuarino de Colombia. A partir de estadísticas de capturas comerciales y prospecciones pesqueras, se determinaron los parámetros básicos de su población: ciclo reproductivo, crecimiento, mortalidad, rendimiento y biomasa por recluta. Se presentaron individuos maduros durante todo el año con un pico de maduración y desove de junio a agosto cubriendo las épocas de lluvia menor y seca, respectivamente. La talla media de madurez se estimó en 23 cm. Los parámetros de crecimiento de la función de von Bertalanffy fueron: L¥ = 32.5 cm y K = 0.38 año-1, en tanto que el índice de...
Tipo: Journal Contribution
Palavras-chave: Population dynamics; Fishery management; Artisanal fishing; Coastal lagoons; Fishery management; Population dynamics; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1998
URL: http://hdl.handle.net/1834/3295

Biologie et dynamique des populations d’Anchois (Engraulis encrasicolus) des côtes mauritaniennes.
Provedor de dados: 20
Autores: Ba, I.S.
Résumé:  Cette étude traite de la biologie et de la dynamique des populations d’anchois (Engraulis encrasicolus) des côtes mauritaniennes. Après un bref rappel des conditions climatiques et hydrobiologiques de la région, une tentative de mise en évidence de race ou population locale a montré que cette espèce pourrait être rattachée à la population méridionale atlantique du Golfe de Gascogne. En  Mauritanie, l’Anchois n’est pêché que de façon accessoire. Les captures les plus abondantes sont réalisées de mai à Septembre essentiellement dans la zone nord où l’on observe un upwelling permanent. Pour évaluer la taille du stock, des estimations de biomasse par échointégration ont été effectuées, mais celles-ci n’ont pas permis de donner un ordre de grandeur...
Tipo: Theses and Dissertations
Palavras-chave: Anchovy fisheries; Upwelling; Population dynamics; Mortality.
Ano: 1988
URL: http://hdl.handle.net/1834/676

Distribución del fitoplancton y su comportamiento en el afloramiento en las Islas Galápagos
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
Los objetivos de este crucero han sido colectar información que permitirá comprender mejor la dinámica poblacional (cuali-cuantitativo) de las diferentes masas de aguas que afloran al este y al oeste de las Islas Galápagos y su interacción entre las islas, estos resultados permitirán dar una mejor apreciación sobre áreas de mayor fertilidad marina ( clorofila "a", contajes celulares), organismos indicadores del afloramiento y su posible asociación con áreas de riqueza ictiológica.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biological production; Indicator species; Ichthyoplankton; Cruises; Population dynamics; Phytoplankton; Biological production; Chlorophylls; Indicator species; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2000
URL: http://hdl.handle.net/1834/2240

Una colonia de lobos marinos sudamericanos (Otaria flavescens) en Salinas, Ecuador
Provedor de dados: 20
Autores: Félix, F.
Evaluaciones periódicas de esta colonia de lobos marinos permitiría conocer mejor su dinámica poblacional a largo plazo e incrementar nuestro conocimiento sobre la presencia de esta especie en aguas ecuatorianas. Una colonia permanentemente en un sitio cerca de la costa, pero al mismo tiempo inaccesible directamente al público, además de tener un interés científico puede tener también un potencial interés turístico para la zona.
Tipo: Journal Contribution
Palavras-chave: Marine mammals; Population dynamics; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2002
URL: http://hdl.handle.net/1834/2262

Tamaño de la población
Provedor de dados: 20
Autores: Carrillo C., E.; Pérez P., C.; Ohtaishi, N.; Kobayashi, M.; Moncada G., F.; Manolis, S. Ch.; Tsubouchi, T.; Webb, G.J.W.
Se presenta la información sobre las tendencias de la población de la E. imbricata durante las capturas históricas en Cuba.  Se analiza la composición por tallas,  la estructura, los anillos de crecimiento, la composición por edades, el tamaño y la dinámica  de la captura histórica
Tipo: Journal Contribution
Palavras-chave: Turtle fisheries; Population dynamics; Harvesting; Population dynamics; Harvesting; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_3500.
Ano: 1998
URL: http://hdl.handle.net/1834/3984

Aspectos biológicos y ecológicos de Mytilopsis sallei (Recluz, 1849) (Bivalvia: Dreissenidae) en bancos de ostra de la Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Puyana, Mónica.
Mytilopsis sallei es una especie que se encuentra ampliamente distribuida sobre sustratos duros en la Ciénaga Grande de Santa Marta, siendo particularmente abundante sobre bancos de ostra de mangle (Crassostrea rhizophorae), donde alcanza densidades de hasta 5000 indiv/m2. Aunque posee una amplia tolerancia a variaciones en la salinidad y temperatura, prefiere aquellos lugares donde la afluencia de aguas dulces es constante. Puede además tolerar aguas turbias con un alto contenido de sedimentos, como en la desembocadura de los ríos. M. sallei no parece aparentemente, competir con la ostra, incluso en aquellos bancos sometidos a intensa explotación. Esto se debe a las preferencias ambientales de cada especie y a la alta productividad de las aguas de la...
Tipo: Journal Contribution
Palavras-chave: Ecology; Population structure; Salinity effects; Temperature effects; Density; Condition factor; Turbidity; Interspecific relationships; Population dynamics; Coastal lagoons; Estuaries; Ecology; Population structure; Turbidity; Estuaries; Density; Population dynamics; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1995
URL: http://hdl.handle.net/1834/3802

Estudio de algunos aspectos del ciclo vital de la merluza de cola Macruronus magellanicus, Lonnberg, 1907.
Provedor de dados: 20
Autores: Giussi, A.R.
Long tailed hake Macruronus magellanicus, is a demersal fish,distributed in the SW Atlantic Ocean, in Malvinas Current waters,from 36° and 55°S, mainly between 50m and 200m depth. The species is also distributed in Chilenian waters in the Pacific Ocean, being caught in the Magellan Strait and the Beagle Channel. Age determination was estimated with the sagittae otoliths, in which only one ring is formed during the year. Growth parameters were calculated directly and with back calculated methodology, no differences were observed between the results. Differences in growth sexes were evident from 3 years old. The oldest age observed was 13. Different distributional areas of adults through out the year could suggest a migratory movement in northern waters of...
Tipo: Theses and Dissertations
Palavras-chave: Life cycle; Growth; Otoliths; Age determination; Reproduction; Population dynamics; Mortality; Population structure; Fishery surveys; Fishing grounds; Geographical distribution; Back calculation; Growth; Otoliths; Age determination; Population structure; Geographical distribution; Life cycle; Reproduction; Population dynamics; Mortality; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1996
URL: http://hdl.handle.net/1834/1488

Historia de vida y dinámica de poblaciones de Lychnorhiza lucerna (Scyphozoa) ¿Un recurso pesquero alternativo?
Provedor de dados: 20
Autores: Schiariti, A.
In this Thesis we presented the first steps in the study of the life history and population dynamics of Lychnorhiza lucerna as well as the possibilities of development of its fishery in Argentina. L. lucerna presented a metagenetic life cycle characteristic of most scyphozoans. Polyps reproduced asexually by the production of podocysts and polidisk strobilation. The combination of both types of asexual reproduction resulted in a high strobilation rates indicating that the abundance of medusae would strongly depend on polyps abundance and reproduction. The absence of ephyrae in the Río de la Plata estuary suggest that L. lucerna doest not complete its life cycle locally but medusae would be produced by polyps located northwards along the Uruguayan or...
Tipo: Theses and Dissertations
Palavras-chave: Life cycle; Life history; Population dynamics; Reproductive cycle; Biomass; Estuarine fisheries; Life history; Biomass; Estuarine fisheries; Life cycle; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_12170; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2674; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2008
URL: http://hdl.handle.net/1834/3109

Corales, formaciones arrecifales y blanqueamiento de 1987 en Bahía Portete (Guajira, Colombia)
Provedor de dados: 20
Autores: Solano-P., Oscar D.
Para el reconocimiento y caracterización de las formaciones arrecifales de Bahía Pórtete se visitaron un total de 22 estaciones entre junio de 1987 y enero de I988. Se registraron por primera vez Acropora cervicomis, Agaricia agaricites, Montastrea cavernosa, Diploría clivosa e Isophyllia sinuosa, elevando a 18 el número de especies de escleractinios de la bahía. El componente principal por su abundancia y diversidad de formas fue el hidrocoral Millepora alcicomis. Las formaciones arrecifales del área se concentran sobre los costados oeste y suroeste, sin llegar a constituirse en verdaderos arrecifes. Estructuralmente se discriminan dos tipos de formaciones: tipo 1 parches arrecifales y tipo 2 praderas de fanerógamas con colonias dispersas de M. alcicomis....
Tipo: Journal Contribution
Palavras-chave: Bleaching; Ecology; Geographical distribution; Habitat; Population structure; Population dynamics; Turbidity; Density; Species diversity; Ecology; Geographical distribution; Population structure; Turbidity; Bleaching; Population dynamics; Density; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_953; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1994
URL: http://hdl.handle.net/1834/3782

Caractères biométriques de la Squille &lt;Squilla mantis&gt; dans les eaux tunisiennes
Provedor de dados: 20
Autores: Mili, S.; Jarboui, O.
Pour l’étude biométrique de la squille Squilla mantis, un échantillonnage régulier a été réalisé dans le golfe de Tunis, le golfe de Hammamet et le golfe de Gabès de janvier 2005 à décembre 2006. Les équations morphométriques de la squille, dans le golfe de Gabès, ont montré que la croissance relative du telson, celle de la masse totale et celle de la masse éviscérée par rapport à celle du céphalothorax sont caractérisées par une allométrie positive. Par contre, la longueur totale croît négativement par rapport à celle du céphalothorax. Pour le golfe de Hammamet, ces caractères ont une croissance marquée par une allométrie négative à part la masse éviscérée. Les équations morphométriques de la squille du golfe de Tunis ont montré une allométrie positive...
Tipo: Journal Contribution
Palavras-chave: Squilla mantis; Biometrics; Comparative studies; Population dynamics; Statistical analysis; Shrimp culture; Statistical analysis; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_7378; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2008
URL: http://hdl.handle.net/1834/3789

Dinámica poblacional y explotación de la almeja púrpura, Amiantis purpurata L
Provedor de dados: 20
Autores: Morsan, E.
The purple clam, Amiantis purpurata, inhabits the warm-temperate waters of the southwestern Atlantic, from Espírito Santo (Brazil) to the San Matías Gulf (Argentina). There are no previous studies dealing with its biology and populations dynamics. Astock located in Playa Villarino (San Antonio Este, San Matías Gulf) supports the only artisanal fishery targeting this species. Some peculiar aspects of its dynamics revealed by this study have significant implications for management: 1. It constitutes the southernmost population of this species, and appears to be isolated from other populations located to the north 2. Individuals are slow-growing 3. It seems to be composed of just one or a few annual classes, which are older than 10 years . 4. The spatial...
Tipo: Theses and Dissertations
Palavras-chave: Population dynamics; Artisanal fishing; Fishery biology; Clam fisheries; Fishery resources; Resource exploitation.
Ano: 2000
URL: http://hdl.handle.net/1834/5034

Sobre la dinámica poblacional de la caballa en la pesquería de Mar del Plata. Período 1980-1990
Provedor de dados: 20
Autores: Perrotta, R.G.; Pertierra, J.P.
This species is a principal basic product of the local canned industry. The results show that the biomass and capture were variable for the studied period as a consequence of change in the capturability, and the fishstock is underexploited. Also was estimated the contribution of recruitment, growth and mortality in the total biomass.
Tipo: Journal Contribution
Palavras-chave: Population dynamics; Mathematical models; Biomass; Biomass; Population dynamics; Mathematical models; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_24199.
Ano: 1993
URL: http://hdl.handle.net/1834/2571

Dinámica de la metapoblación de almeja panopea Panopea abbreviata en los golfos norpatagónicos
Provedor de dados: 20
Autores: Zaidman, P.C.
Panopea abbreviata es el molusco bivalvo infaunal de mayor tamaño del Mar Argentino. Se distribuye desde Río de Janeiro (Brasil) hasta la Patagonia Argentina. En los golfos San Matías (GSM) y San José (GSJ), conforma una metapoblación que presenta una distribución discontinua, formada por una serie de poblaciones ubicadas a lo largo de las costas.Es el bivalvo más longevo explotado en el Atlántico Sur. En el GSM su pesquería comenzó en el año 2000 y, si bien la misma es incipiente, debido a las características biológico-poblacionales de P. abbreviata es un recurso que requiere de un manejo precautorio. Excepto por estudios preliminares sobre el crecimiento y el ciclo reproductivo, no se contaba con la información básica para manejo. El objetivo general del...
Tipo: Theses and Dissertations
Palavras-chave: Fishery biology; Marine molluscs; Population dynamics; Sustainable management; Age; Growth; Mortality rate; Recruitment; Population structure; Spatial variations; Sex composition; Reproductive cycle; Histology; Environmental conditions.
Ano: 2013
URL: http://hdl.handle.net/1834/5236

La praire  (&lt;Venus rosalina&gt;) à l'Ouest du Banc d'Arguin (Mauritanie) : évaluation des stocks et dynamique des populations.
Provedor de dados: 20
Autores: Diop, M.
Ce travail est consacré à l’étude du banc à &lt;Venus rosalina&gt; situé à l’ouest du Banc d’Arguin (Mauritanie). Ce gisement est d’un intérêt économique certain, puisque la biomasse  estimée se situe entre 1,3 et 2,8 millions de tonnes. Après une présentation des résultats obtenus sur les paramètres biologiques essentiels, une approche dynamique de l’étude de la population a été réalisée. Ainsi, en retenant quatre hypothèses de mortalité naturelle, les courbes de rendement par recrue ont été construites. Les productions annuelles potentielles ont pu être calculées sous deux hypothèses d’âge à la première capture et en fixant l’effort de pêche au niveau FO.1. Elles se situeraient en moyenne à 300.000 tonnes, mais avec une forte variabilité liée aux...
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Population dynamics; Stock assessment; Seashells; Stock assessment; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 1988
URL: http://hdl.handle.net/1834/1187

Dynamique de la population de Sandre  Stizostedion Lucioperca
Provedor de dados: 20
Autores: Toujani, R.; Kraiem, M.M.
L’étude de la dynamique de population du sandre Stizostedion lucioperca dans la retenue du barrage de Sidi Salem (nord de la Tunisie) a été réalisée durant deux saisons : avril 1996 - mars 1998 . Elle a porté sur un échantillon de 1325 individus capturés par les pêcheurs professionnels. Cette étude a montré que: - La taille moyenne individuelle des sandres captures est inférieure à 30 cm pour une proportion supérieure à 75 % . - La taille de recrutement dans la pêcherie estimée à 18 cm est très inférieure à la taille de première maturité sexuelle de l’ espèce qui est de 24 cm. - La taille et la masse individuelles moyennes des sandres capturés se sont améliorées durant la saison 1997 par rapport à celle de 1996. - Le taux de mortalité par pêche des groupes...
Tipo: Journal Contribution
Palavras-chave: Taille; Mortalité; Length-weight relationships; Recrutement; Masse; Recruitment; Stizostedion lucioperca; Mortality; Freshwater fish; Population dynamics; Pike perch; Http://aims.fao.org/aos/agrovoc/c_5877.
Ano: 2002
URL: http://hdl.handle.net/1834/221

Dinámica poblacional del coroncoro Micropogonias furnieri (Pisces: Sciaenidae) en la Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Narváez-Barandinga, J.C.; Blanco Racedo, J.
The “Coroncoro” fish Micropogonias furnieri has been one of the most important traditional fish resources in CGSM and CP. In order to determine exploitation status of its stock, aspects related to its biology and population parameters have been assessed. Mean maturity size was estimated in 20.7 cm at total length; whereas sex ratio was 2.39 females per male. Ripe individuals occurred throughout the whole year, with a maturation and spawning peak in the rainy season (november). Length-weight relationship showed no difference between sexes and a common equation with allometric growth W = 0.0064LT3.2 was estimated. The estimated parameters of von Bertalanffy growth function were L∞ = 34.0 cm, K = 0.44 yr-1, t0 = 0.301 yr and C = 0.5; with a growth index...
Tipo: Journal Contribution
Palavras-chave: Population dynamics; Fishery management; Artisanal fishing; Growth; Fishery management; Growth; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2006
URL: http://hdl.handle.net/1834/1980

Essai d’acclimatation du tilapia du nil "Oreochromis niloticus"  dans la retenue du barrage Lebna (Cap bon, Tunisie)
Provedor de dados: 20
Autores: Derouiche, E.; Azaza, M.S.; Kraiem, M.M.
Ce travail consiste à tester l’acclimatation d’une espèce thermophile, le tilapia du Nil Oreochromis niloticus dans la retenue du barrage Lebna (Cap Bon), moyennant un système extensif de grossissement. Les résultats montrent que le tilapia introduit directement en pleine retenue a pu se maintenir et supporter les mauvaises conditions hivernales en adoptant une stratégie d’hibernation. Par ailleurs, avec le retour des conditions favorables (T&gt;20°C), ce Cichlidé a montré une bonne condition, une meilleure croissance qu’en élevage dans les bassins et cette fraction de population a pu proliférer.
Tipo: Journal Contribution
Palavras-chave: Acclimatization; Brackishwater fish; Environmental conditions; Fish culture; Growth; Hibernation; Population dynamics; Rearing; Water reservoirs; Testing; Tilapia.
Ano: 2009
URL: http://hdl.handle.net/1834/4494

Características ecológicas del pulpito Octopus Tehuelchus en tres ambientes del golfo San Matías
Provedor de dados: 20
Autores: Storero, L.P.
Coastal marine ecosystems are highly variable and the inherent biotic and abiotic factors of these environments can influence the bio-ecological characteristics of the living cephalopods. The presence of the small octopus “pulpito” Octopus tehuelchus in the coastal environments of San Matías Gulf has been exploited by artisanal fishermen for more than 60 years. The aim of this study is to evaluate the variations in the life cycle of the pulpito, and the factors that could account for these variations in three different coastal environments of San Matías Gulf, with differences in the physical, ecological and fisheries characteristics. This study was developed in San Antonio bay, El Fuerte and Islote Lobos. Monthly samplings (October 2005-2007) in the...
Tipo: Theses and Dissertations
Palavras-chave: Fishery biology; Cephalopod fisheries; Artisanal fishing; Coastal zone management; Coastal environment; Environmental conditions; Population dynamics; Sex composition; Spatial distribution; Morphology (animal); Life cycle; Feeding; Size-at-first-maturity; Age determination; Growth; Reproduction; Reproductive behaviour.
Ano: 2010
URL: http://hdl.handle.net/1834/5023

Fitoplancton en el afloramiento de las Islas Galápagos, durante Agosto 2000
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
Esta investigación es parte del Proyecto Indicadores Biológicos de diferentes ecosistemas marinos del Ecuador, correspondiente a la región Insular de Galápagos durante agosto 2000, con el propósito de comprender la dinámica poblacional del fitoplancton (cuali-cuantitativo) de las diferentes masas de agua que afloran al este y oeste de Galápagos y entre las islas enfocando áreas de mayor fertilidad marina en la época seca.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biomass; Upwelling; Marine ecology; Water masses; Population dynamics; Cruises; Oceanic islands; Phytoplankton; Biomass; Chlorophylls; Marine ecology; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_4609; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2002
URL: http://hdl.handle.net/1834/2296

Biología, ecología y explotación de la raya platana Atlantoraja platana (Günther, 1880), (Chondrichthyes, Rajidae), del golfo San Matías
Provedor de dados: 20
Autores: Coller, N.M.
La “raya platana” (Atlantoraja platana), es una especie endémica del Atlántico Sudoccidental, habita desde los 22º S (Uruguay y sur de Brasil) hasta los 42º S, región del Golfo San Matías (Argentina). El área de estudio del presente trabajo fue el Golfo San Matías (41º- 42º S y 64º- 65º O). El material analizado (778 hembras y 709 machos) fue colectado durante muestreos mensuales de las capturas desembarcadas por los barcos pesqueros de la flota local (muestreos de desembarque); muestras extraídas a bordo de las embarcaciones pesqueras por el programa de observadores a bordo, durante los años 2004 y 2005 y los meses de marzo, abril y mayo de 2006; y durante la realización de campañas de investigación pesquera (primavera de 2004, 2005 y 2006). Se describió...
Tipo: Theses and Dissertations
Palavras-chave: Fishery biology; Ecology; Feeding behaviour; Age (biological); Growth; Coastal environment; Morphology (animal); Reproduction (biology); Spatial distribution; Population dynamics; Abundance.
Ano: 2012
URL: http://hdl.handle.net/1834/5235

Dinámica poblacional de la langosta Panulirus argus (Latreille, 1804)
Provedor de dados: 20
Autores: Alzugaray Martínez, Romina; Puga Millán, Rafael.
La región suroriental de Cuba es la segunda zona en aportes a los desembarques nacionales de langosta, Panulirus argus. Esta zona, al igual que el resto del país, presentó las mayores capturas a mediados de los años 80, decreciendo posteriormente hasta promediar en los últimos años menos de 1 000 t. Con el objetivo de caracterizar la dinámica de la población de langosta y del esfuerzo pesquero aplicado en esta región, se analizó información sobre captura, esfuerzo pesquero y composición por tallas de las capturas de langosta. Mediante técnicas de Análisis Secuencial de Poblaciones, se demuestra que en los últimos años ha ocurrido una disminución del número de individuos de la población de langosta, de la biomasa y del reclutamiento, en relación con la...
Tipo: Journal Contribution
Palavras-chave: Lobster fisheries; Population dynamics; Fishery biology.
Ano: 2010
URL: http://hdl.handle.net/1834/4185

Impact de l'érosion côtière et éléments d'étude de vulnérabilité : example du Togo (Golfe de Guinée)
Provedor de dados: 20
Autores: Blivi, A.B.
La morphodynamique côtière permet d'analyser les séquences de plages réflexives et dissipatrices des côtes sablonneuses. Les ouvrages maritimes perturbent le mécanisme hydro-sédimentaire et déclenchent l'érosion côtière dont les impacts de recul sont généralement assez forts, notamment de 12 m/an sur le segment de 5 km de côte, à l'est du système d'infrastructures portuaires de Cotonou, au Bénin, et de 5 à 10 m/an sur environ 30 km de côte, au Togo. Cette caractérisation morphodynamique de plage, aussi bien à court qu'à long terme, est en réponse aux variations significatives du bilan sédimentaire dont les conséquences ' sont très importantes du fait de l'utilisation de l'espace pour des activités industrielles et urbaines très variées et de la forte...
Tipo: Journal Contribution
Palavras-chave: COASTAL EROSION; Coastal zone; Growth; Population dynamics; Population number; Growth; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2001
URL: http://hdl.handle.net/1834/1236

Conocimiento biológico pesquero del recurso merluza (Merluccius hubbsi) y su pesquería en la República Argentina.
Provedor de dados: 20
Autores: Bezzi, S.I.; Dato, C.V.
This paper summarizes the present knowledge on Merluccius hubbsi and its fishery in Argentina, based on the model proposed by the Technical Secretary of Comisión Técnica Mixta del Frente Marítimo, in 1990. It includes the taxonomic location of the species, its geographical distribution, stock unity, structure and population dynamics. It describes the fishing gear and fishing operations and presents the available information on selectivity and discards. The paper shows the data landings separated by fleet. Exploitation regulatory measures in force are included.
Tipo: Journal Contribution
Palavras-chave: Gadoid fisheries; Population dynamics; Stock assessment; Mortality; Population structure; Fishery management; Landing statistics; Parasites; Stock assessment; Population structure; Fishery management; Mortality; Parasites; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_5574; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 1995
URL: http://hdl.handle.net/1834/2558

Dinámica y estructura poblacional del langostino colorado III y IV regiones. Informe Final, FIP n° 2005 -41
Provedor de dados: 20
Autores: Quiroz, J.C.; Montenegro, C.; Báez, P.; Espíndola, F.
Se reportan las actividades y resultados del proyecto FIP 2005-41 “Dinámica y estructura  poblacional del langostino colorado III y IV Regiones”. Para abordar el estudio de la dinámica y estructura poblacional de P. monodon, se plantearon dos hipótesis. Una postula que la especie posee una estructura poblacional a lo largo de la plataforma continental, en un gradiente latitudinal, en tanto que la otra plantea que la especie tiene una estructura poblacional a través de la plataforma continental, en un gradiente longitudinal. Para someter a pruebas estas hipótesis se realizaron varios análisis estadísticos de variables fundamentales del stock, como la densidad, los tamaños corporales, las edades y componentes del stock en función de su madurez. Los...
Tipo: Report
Palavras-chave: Population dynamics; Population structure; Size distribution; Spawning populations; Statistical models; Marine crustaceans; Population structure; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2006
URL: http://hdl.handle.net/1834/1505

Variación de la población del ictioplancton en el Pacífico Sur Oriental durante diciembre de 1997
Provedor de dados: 20
Autores: Ortega, D.
Uno de los principales objetivos de esta investigación es contribuir al estudio del ictioplancton y zooplancton durante el evento El Niño 1997 en el Pacífico Sur Oriental y a la vez relacionar la abundancia, migración y distribución de los diferentes grupos de organismos con los parámetros de temperatura y salinidad, con respecto a la variación de la población del ictioplancton
Tipo: Journal Contribution
Palavras-chave: Ichthyoplankton; Zooplankton; El Nino phenomena; Geographical distribution; Environmental factors; Population dynamics; Fish eggs; Fish larvae; Geographical distribution; Zooplankton; Environmental factors; Population dynamics; Fish larvae.
Ano: 1998
URL: http://hdl.handle.net/1834/2291

Life expectancy of Helicoverpa armigera on chickpea
Provedor de dados: 30
Autores: Dabhi, M.V.
Palavras-chave: Chickpeas; Animal ecology; Eggs; Poultry equipment; Grain legumes; Animal developmental stages; Sexual reproduction; Population dynamics; Ecology; Mass media.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3341

Waterboatmen, and testing for Lotka-Volterra-type interactions
Provedor de dados: 27
Autores: Bergmans, M.
A previous paper by Istock, in which this author claims to have successfully applied the Lotka-Volterra model to his observations on corixid population dynamics, is criticised for the shortcomings in evidence cited to support the model's fit with the data. It is contended that the dynamic behaviour of the system of Hesperocorixa lobata - Sigara macropala interaction is not in accordance with the Lotka-Volterra model. ThIs brief critique is followed by comments by istock in reply to the points raised in Bergmans' letter.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Models; Population dynamics; Corixidae.
Ano: 1979
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3600

Paratenic hosts of the swimbladder nematode &lt;i&gt;Anguillicola crassus&lt;/i&gt;
Provedor de dados: 27
Autores: Thomas, B.; Ollevier, F.P.
The host specificity and population dynamics of &lt;i&gt;Anguillicola crassus&lt;/i&gt; in a number of paratenic hosts were investigated. Various freshwater fish species were sampled monthly (March 1990 to March 1991) from the Kolenhaven (Albertcanal, Genk, Belgium) and examined for L&lt;sub&gt;3&lt;/sub&gt;-larvae of &lt;i&gt;Anguillicola crassus&lt;/i&gt;. Sixteen species were found to be infected: all the physoclist species examined (&lt;i&gt;Gymnocephalus cernua, Lepomis gibbosus, Ictalurus nebulosus, Stizostedion lucioperca, Gasterosteus aculeatus, Oreochromis niloticus&lt;/i&gt; and &lt;i&gt;Perca fluviatilis&lt;/i&gt;) and those physostome species of which a sufficient number could be examined to detect the infection (&lt;i&gt;Gobio gobio, Leuciscus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Endoparasites; Freshwater fish; Hosts; Introduced species; Parasites; Population dynamics; Specificity; Swim bladder; Anguillicola crassus; Pisces [Fish].
Ano: 1992
URL: http://www.vliz.be/imisdocs/publications/299068.pdf

A model of nematode dynamics in the Westerschelde Estuary
Provedor de dados: 27
Autores: Li, J.; Vincx, M.; Herman, P.M.J.
We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].
Ano: 1996
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284

Population density of Tibraca limbativentris on flood irrigated rice and alternative host plants
Provedor de dados: 86
Autores: Pasini,Mauricio Paulo Batistella; Lúcio,Alessandro Dal’Col; Cargnelutti Filho,Alberto; Ribeiro,Ana Lúcia de Paula; Zamberlan,João Fernando; Lopes,Sidinei José.
Abstract: The objective of this work were to evaluate the population dynamics of the rice stem bug (Tibraca limbativentris) around and in flood irrigated rice cultivation area, to quantify the insect population flow between crops and host plants, and to determine the effect of the species, the diameter of the plant, and the distance of the host plant from the border on the rice stem bug population. The work was conducted in the 2012/2013 harvest and in the off-season, with sampling of rice, Andropogom bicornis, and Andropogon lateralis plants in six cultivated areas, in order to count the number of insects. The population density of the rice stem bug in irrigated rice and alternative host plants presents spatial and temporal dependence. In the cultivated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Geostatistics; Population dynamics; Quiescence; Rice stem bug.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000300265

Predicting the occurrence of alate aphids in Brassicaceae
Provedor de dados: 86
Autores: Cividanes,Francisco Jorge; Santos-Cividanes,Terezinha Monteiro dos.
The objective of this work was to predict the occurrence of alates of Brevicoryne brassicae, Lipaphis erysimi, and Myzus persicae (Hemiptera, Aphididae) in Brassicaceae. The alate aphids were collected in yellow water traps from July 1997 to August 2005. Aphid population peaks were predicted using a degree‑day model. The meteorological factors, temperature, air relative humidity, rainfall, and sunshine hours, were used to provide precision indexes to evaluate the best predictor for the date of the first capture of alate aphids by the traps. The degree‑day model indicated that the peak population of the evaluated aphid species can be predicted using one of the following biofix dates: January 1st, June 1st, and the date of the first capture of the alate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea; Pest management; Population dynamics; Thermal requirements.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000400005

Bemisia tabaci, Brevicoryne brassicae and Thrips tabaci abundance on Brassica oleracea var. acephala
Provedor de dados: 86
Autores: Leite,Germano Leão Demolin; Picanço,Marcelo; Jham,Gulab Newandram; Moreira,Márcio Dionízio.
Kale Brassica oleracea var. acephala is attacked by whitefly Bemisia tabaci, aphid Brevicoryne brassicae and Thrips tabaci. One of the main reasons for extensive insecticide application is the lack of information about factors that control insect population. The objectives of this study were to investigate the relationships between predators and parasitoids, organic compound leaves, levels of leaf nitrogen and potassium, total rainfall, relative humidity, sunlight and median temperature on the abundance of whitefly, aphid, and thrips in kale genotype "Talo Roxo". The beating tray method, direct counting and magnifying lens were used to estimate the number of these pests, predators and parasitoids. Median temperature, sunlight and relative humidity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Nonacosane; Climatic factors; Braconidae.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300001

Phytosociology in agricultural areas submitted to distinct wintercropping management
Provedor de dados: 87
Autores: Concenço,G.; Ceccon,G.; Sereia,R.C.; Correia,I.V.T.; Galon,L.
Studies related to weed dynamics are essential for agricultural sustainability in tropical soils, as their interference can cause significant yield losses, especially in crops with lower competitive ability. This study aimed to assess the composition of weed communities in the third cropping season in areas submitted to distinct wintercroppings for two consecutive years. Evaluations were made in terms of species composition, level of infestation, and severity of occurrence of each weed species in relation to the others within the same area. The wintercropping management systems were: (1) Brachiaria ruziziensis; (2) corn intercropped with B. ruziziensis; (3) corn and (4) cowpea. Plant communities under these wintercrop systems were evaluated in the third...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Population dynamics; Allelopathy; Crop rotation; Light quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200008

Atlas demographique des populations de poissons d'eau douce d'Afrique
Provedor de dados: 31
Autores: Moreau,   J.; Palomares,   M.L.D.; Torres,   F.S.B.; Pauly,   Daniel.
Tipo: Report
Palavras-chave: Freshwater fish; Population dynamics; Stock assessment; Growth curves; Catch/effort; Recruitment; Fishery biology; Africa; Resource /Energy Economics and Policy.
Ano: 1995
URL: http://purl.umn.edu/44838

The Peruvian anchoveta and its upwelling ecosystem: three decades of change
Provedor de dados: 31
Tipo: Report
Palavras-chave: Clupeoid fisheries; Population dynamics; Upwelling; Peru; Engraulis ringens; Livestock Production/Industries.
Ano: 1987
URL: http://purl.umn.edu/44683

Weed Search and Control: Theory and Application
Provedor de dados: 31
Autores: Cacho,   Oscar J.; Spring,   Daniel; Pheloung,   Paul; Hester,   Susan M.
The detectability of invasive organisms influences the costs and benefits of alternative control strategies, and the feasibility of eradicating an infestation. Search theory offers a mathematically rigorous framework for defining and measuring detectability, taking account of searcher ability, biological factors and the search environment. To demonstrate the application of search theory to invasive species control, invasive species detectability is incorporated into a population simulation model. The model is applied to a base set of parameter values that represent reasonable values for a hypothetical weed. The analysis shows the effects of detectability and search time on the duration of an eradication program. Furthermore, for a given level of...
Tipo: Working or Discussion Paper
Palavras-chave: Search and control; Search theory; Weed control; Stage matrix; Impedance factors; Population dynamics; Stochastic model; Farm Management.
Ano: 2004
URL: http://purl.umn.edu/12919

Growth, mortality and recruitment of commercially important fishes and penaeid shrimps in Indonesian waters
Provedor de dados: 31
Autores: Dwipongo,   A.; Hariati,   T.; Banon,   S.; Palomares,   M.L.D.; Pauly,   Daniel.
Tipo: Report
Palavras-chave: Population dynamics; Stock assessment; Commercial species; Shrimp fisheries; Agribusiness.
Ano: 1986
URL: http://purl.umn.edu/44682

Applying search theory to determine the feasibility of eradicating an invasive population in natural environments
Provedor de dados: 31
Autores: Cacho,   Oscar J.; Hester,   Susan M.; Spring,   Daniel.
The detectability of invasive organisms influences the feasibility of eradicating an infestation. Search theory offers a framework for defining and measuring detectability, taking account of searcher ability, biological factors and the search environment. In this paper, search theory concepts are incorporated into a population model, and the costs of search and control are calculated as functions of the amount of search effort (the decision variable). Simulations are performed on a set of weed scenarios in a natural environment, involving different combinations of plant longevity, seed longevity and plant fecundity. Results provide preliminary estimates of the cost and duration of eradication programs to assist in prioritising weeds for control. The...
Tipo: Article
Palavras-chave: Bioeconomics; Invasive species; Operations research; Population dynamics; Weed control; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/118522

Flowering phenology, seed set and arthropod guilds in Trichogoniopsis adenantha (DC) (Asteraceae) in south-east Brazil
Provedor de dados: 88
Autores: Romero,Gustavo Q; Vasconcelos Neto,João.
and glades. This species blooms throughout the year, attracting arthropods of various guilds, including herbivores, pollinators and predators. In this study, done over a two year period, we described the phenology of T. adenantha and assessed the seasonal variation in arthropod numbers of different guilds. We also determined the periods of lowest and highest seed set. T. adenantha population showed a peak in flowering in March-April (rainy season) with greater production of achenes in December-April. April and October had respectively highest and lowest number of fertilized, undamaged ovules, and this pattern is possibly related with population dynamics of pollinators and herbivores. In August, which was the period of greatest damage to the stigma (by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal-plant interactions; Floral herbivory; Pollination; Population dynamics; Pre-dispersal seed predation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000100014

Estrutura e dinâmica de uma população de Calophyllum brasiliense Camb. em floresta higrófila do sudeste do Brasil
Provedor de dados: 88
Autores: MARQUES,MÁRCIA C. M.; JOLY,CARLOS ALFREDO.
As estruturas de tamanho e espacial de uma população de Calophyllum brasiliense (Clusiaceae) foram estudadas em uma área de 3600 m2 de floresta higrófila localizada em Brotas, SP. No primeiro censo, foram marcados 1658 indivíduos e, após um ano, este número havia aumentado para 1706. A estrutura de tamanho não mudou durante o período de estudo, com predomínio de plântulas (indivíduos £ 0,2 m) e jovens (&amp;gt; 0,2 - 2 m) e menor número de subadultos (&amp;gt; 2 - 10 m) e adultos (&amp;gt; 10 m). A mortalidade em plântulas (29,7%) e jovens (5,3%) foi bem maior que em subadultos (0,7%) e adultos (0%), e teve como causa principal o soterramento na época chuvosa. O maior número de plantas novas concentrou-se nos locais mais baixos da área, onde sementes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Swamp forest; Population dynamics; Demography; Calophyllum brasiliense.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000100012

Elbella luteizona (Mabille, 1877) (Lepidoptera, Hesperiidae: Pyrginae) in Brazilian Cerrado: larval morphology, diet, and shelter architecture
Provedor de dados: 92
Autores: Lepesqueur,Cintia; Neis,Marina; Silva,Neuza A.P.; Pereira,Thayane; Rodrigues,Hanna Pâmela A.; Trindade,Tácito; Diniz,Ivone R.
Abstract This study examined temporal variation in the abundance of immature stages of Elbella luteizona (Hesperiidae) and describes the morphology and behavior of the larvae on their host plants, Byrsonima coccolobifolia and Myrsine guianensis. Five hundred sixty-eight 10 m diameter plots were searched for caterpillars in the Brazilian Cerrado over a period of one year. We inspected 5968 host plants, and found 31 eggs and 262 larvae on 244 plants. Similar numbers of immatures were found in both species of host plants. The abundance of immature stages varied monthly and was significantly higher in the dry season on both host plants, which may be due to the low density of natural enemies during that time. E. luteizona is univoltine, and larvae present...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caterpillar; Host plants; Population dynamics; Skippers; Univoltine.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262017000400282

Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil
Provedor de dados: 103
Autores: Andreazzi,Cecilia S. de; Rademaker,Vitor; Gentile,Rosana; Herrera,Heitor M.; Jansen,Ana M.; D'Andrea,Paulo S.
The Pantanal is a South American biome characterized by extensive plains and stark environmental seasonality. Several habitats are subject to annual flooding, forcing small mammal species to aggregate in dry forest patches, which most likely influences their population dynamics and life history strategies. In order to investigate the seasonal influence on the life history traits of these small mammals, we conducted a 2-year mark-recapture study in the southeastern region of the Brazilian Pantanal (Nhecolândia) and analyzed the population dynamics of the most abundant small mammal species with the jackknife estimator. A trapping effort of 21,560 trap-nights resulted in 615 individuals in 1,171 captures (success = 5.43%). Three species of rodents - Oecomys...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gracilinanus agilis; Oecomys mamorae; Population dynamics; Seasonality; Small mammal; Thrichomys pachyurus.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600009

Artificial nests as an alternative to studies of arboreal small mammal populations: a five-year study in the Atlantic Forest, Brazil
Provedor de dados: 103
Autores: Loretto,Diogo; Vieira,Marcus Vinícius.
Despite the great diversity of Brazilian Atlantic forest small mammals, natural history of most species is unknown due to their cryptic and nocturnal habits, but also due to the inadequacy of methods to capture some species, especially those of arboreal habits. A new technique, based on the use of artificial nests (AN) to record arboreal marsupials, is presented. Artificial nests were combined with traditional live traps to study the population ecology of four didelphid marsupial species. After 62 months of monitoring, 119 individuals were recorded 243 times (total success = 5.2%). Only 26 individuals (22%) were recorded by both AN and live trap methods, and two of the four species were never captured by live traps, only by AN. Live traps alone would have...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Didelphidae; Mark-recapture; Live trapping; Population dynamics; Marsupials.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000300013

Seasonal dynamics of larvae and adults of two Enochrus Thomson (Coleóptera: Hydrophilidae) species in temporary and permanent water bodies of an urban park in Buenos Aires
Provedor de dados: 97
Autores: BYTTEBIER,BARBARA; FISCHER,SYLVIA; TORRES,PATRICIA L. M.
The dynamics of Enochrus variegatus (Steinheil) and Enochrus vulgaris (Steinheil) in temporary pools and permanent ponds were studied in an urban park of Buenos Aires, Argentina. Samples were collected from both types of habitats weekly throughout one year, and variables like water surface and vegetation cover were recorded. In permanent ponds, adults of both species were found throughout the study period, while in temporary pools their presence depended on the availability of water. Differences in their reproductive seasons and breeding sites were observed. Enochrus vulgaris was characterized by an opportunistic strategy, and its larvae were detected in both types of habitats, associated mainly with spring and summer temperatures. Conversely, E....
Tipo: Journal article
Palavras-chave: Adaptation to drought; Aquatic Coleoptera; Hydrophilidae; Population dynamics; Water permanence.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300003

Why the dimension matters in ecological models?
Provedor de dados: 97
Autores: Ramos-Jiliberto,Rodrigo; Hoecker-Escuti,Francisco; Mena-Lorca,Jaime.
In this work we discuss the ecological and mathematical significance of system's dimension in continuous-time population dynamics models. We show how the system's dimension reflects the ecological assumptions and affects both the spectrum of dynamic output and mathematical tractability of the models. We stress that the model dimension is not always the same as the number of state-variables, and we also present conditions under which the system's dimension is altered
Tipo: Journal article
Palavras-chave: ODE; Population dynamics; Theoretical models; Mathematical ecology; Stability.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400012

The dynamics of natural populations: feedback structures in fluctuating environments
Provedor de dados: 97
Autores: LIMA,MAURICIO.
The fluctuations exhibited by natural populations have fascinated ecologists for the last eighty years. However, a vigorous debate between different schools of population ecologists has hampered reaching a consensus about the causes of such numerical fluctuations. Recent findings and a more synthetic view of population change espoused by ecologists, statisticians, and mathematicians have integrated the role of nonlinear feedback (deterministic) and external environmental (deterministic or stochastic) processes in the dynamics of natural populations. The new challenge for population ecologists is to understand how these two different forces interact in nature. In this commentary, I review some of the basic principles of population analysis during the last...
Tipo: Journal article
Palavras-chave: Population dynamics; Feedback structure; Exogenous factors; Seasonal regulation; Stochasticity; Food web structure; Climate.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200009

Ecological aspects of Bacillus thuringiensis in an Oxisol
Provedor de dados: 63
Autores: Ferreira,Lessandra Heck Paes Leme; Suzuki,Marise Tanaka; Itano,Eiko Nakagawa; Ono,Mário Augusto; Arantes,Olívia Márcia Nagy.
Bacillus thuringiensis is a Gram positive, sporangial bacterium, known for its insecticidal habilities. Survival and conjugation ability of B. thuringiensis strains were investigated; vegetative cells were evaluated in non-sterile soil. Vegetative cells decreased rapidly in number, and after 48 hours the population was predominantly spores. No plasmid transfer was observed in non-sterile soil, probably because the cells died and the remaining cells sporulated quickly. Soil is not a favorable environment for B. thuringiensis multiplication and conjugation. The fate of purified B. thuringiensis toxin was analyzed by extractable toxin quantification using ELISA. The extractable toxin probably declined due to binding on surface-active particles in the soil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Insecticidal crystal protein; Conjugation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100004

Soil seed banks
Provedor de dados: 63
Autores: Christoffoleti,P.J.; Caetano,R.S.X.
The goal of this literature review is to discuss some of the major aspects of the soil seed bank, from its characteristics down to methodological aspects of its determination. Soil seed bank is the reservoir of viable seeds or of vegetative propagules that are present in the soil and that are able to recompose a natural vegetation. In the agroecossystems the soil seed bank is related to weeds, and the knowledge of its size and composition in terms of species can be used in the prediction of future infestations, to built simulation models of population establishment through time and also the definition of soil and cultural management programs, in order to have a rational use of herbicides.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Soil seed bank; Population dynamics.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500013

Entomological research during 1974
Provedor de dados: 106
15 ill., 15 tables
Palavras-chave: Corn; Maize; Sorghum; Insect pests; Entomology; Shoot fly; Varieties; Pest resistance; Population dynamics; Yields; Losses; ข้าวโพด; ข้าวฟ่าง; แมลงศัตรูพืช; กีฏวิทยา.
Ano: 1974
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3803

ความสัมพันธ์ระหว่างระยะการเจริญเติบโตของข้าวกับการเปลี่ยนแปลงประชากร หอยเชอรี่ในนาข้าวจังหวัดนครราชสีมา
Provedor de dados: 106
Autores: Urassaya Boonpramuk; Pitsanu Hintang; Tanatath Tasanthia; Wantana Sriratanasak.
Population dynamic of golden apple snails related in rice planting phase at Nakhon Ratchasima provinces was conducted at irrigated rice field in Chok Chai district and rainfed rice field in Phimai district from January 2012 – November 2014. The objective of this research was to determine the dynamics of golden apple snail population, which snails (applied removal sampling method) were randomly sampled consecutively by Quadrat sampling (1x1 m) at two-week interval. The results showed that the highest snails - density at irrigated rice field was in booting stage but at rainfed rice field the highest density was in after harvesting phase and booting stage. Snail density showed slightly correlated with water level in irrigated rice field (rs = 0.501, P =...
Tipo: Collection
Palavras-chave: Golden apple snail; Population dynamics; Irrigated rice field; Rainfed rice field; หอยเชอรี่; การเปลี่ยนแปลงประชากร; นาชลประทาน; นาน้ำฝน.
Ano: 2015
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5894

Population dynamic study of rodents in maize
Provedor de dados: 106
Autores: Puangtong Boonsong; Korntong Puangprakhon; Yuvaluk Khoprasert; Taksin Archawakom; Chompoonut Chanyapate; Vera Chamkrachang.
4 ill., 4 tables
Palavras-chave: Corn; Maize; Rodents; Population dynamics; ข้าวโพด; หนู; การเปลี่ยนแปลงประชากร.
Ano: 1992
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4509

ความสัมพันธ์ระหว่างระยะการเจริญเติบโตของข้าวกับการเปลี่ยนแปลงประชากร หอยเชอรี่ในนาข้าวจังหวัดเชียงราย
Provedor de dados: 106
Autores: Urassaya Boonpramuk; Kornsiri Srinil; Yuttana Wongsrida; Wantana Sriratanasak.
Population dynamic of golden apple snails related in rice planting phase at Chiang Rai provinces was conducted at irrigated rice field and rainfed rice field in Pan District from January 2012 – November 2014. The objective of this research is to determine the dynamics of golden apple snail population, which snails (applied removal sampling method) were randomly sampled consecutively by Quadrat sampling (1x1 m) at two-week interval. The results showed that the highest snails - density at irrigated rice field was in after harvesting phase but at rainfed rice field the highest density was in booting stage. Snail density showed slightly correlated with water level in rainfed rice field (rs = 0.517, P = 0.011, n = 23) but there was no correlation observed at...
Tipo: Collection
Palavras-chave: Golden apple snail; Population dynamics; Irrigated rice; Rainfed rice; Chiang Rai province; หอยเชอรี่; การเปลี่ยนแปลงประชากร; ข้าวนาชลประทาน; ข้าวนาน้ำฝน; จังหวัดเชียงราย.
Ano: 2015
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5890

Population dynamics of the corn thrips, Frankliella williamsi Hood. on baby and sweet corn varieties
Provedor de dados: 106
Autores: Sawarng Charoenying; Somchai Isichaikul; Amornsak, W.
5 tables
Palavras-chave: Corn; Maize; Corn thrips; Frankliniella williamsi; Sweet corn; Baby corn; Vegetable corn; Population dynamics; Insect pests; ข้าวโพด; ข้าวโพดหวาน; ข้าวโพดฝักอ่อน; เพลี้ยไฟ; ประชากร.
Ano: 1986
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4416

Population dynamics of maize insects on seven varieties of maize
Provedor de dados: 106
Autores: Sawarng Charoenying.
1 table
Palavras-chave: Corn; Maize; Insect pests; Population dynamics; ข้าวโพด; ประชากร; แมลงศัตรูพืช; พันธุ์.
Ano: 1989
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4372

การเปลี่ยนแปลงประชากรของแมลงศัตรูข้าวที่สำคัญในจังหวัดเชียงราย จากผลกระทบของสภาวะภูมิอากาศที่เปลี่ยนแปลง
Provedor de dados: 106
Autores: Kornsiri Srinil; Nootjarin Jungkhun; Tarapron Yuenyong; Kuntera Kanta; Antika Tonmit; Netnapa Pumhan.
Study about the accordance of rice insect pests from the light trap and the research data of insects in the rice seed of San-pah-tawng 1 (weak) and that of SuphanBuri 1 (resistant) was conducted from the year 2011 to 2013 at the Chiang Rai Rice Research Center. It’s found that the rice insect pests entrapped by the light trap being increased from the year 2007 to 2010. That in May, 2011, 4,779  zigzag leafhoppers were mostly found; in March, 2012, 19,248 whitebacked planthoppers were mostly found and; in May, 2013, 19,047 zigzag leafhoppers were mostly found. In the paddy field, rice insect pests were found in the rice seed of San-pah-tawng 1 more than that of Suphan Buri 1. In the In-season rice of the year 2011, the White backed planthoppers were mostly...
Tipo: PhysicalObject
Palavras-chave: Whitebacked planthoppers; Brown planthoppers; Light trap; Climatic change; Rice; Sanpatong 1 variety; Suphanburi variety; Weak variety; Resistant variety; Insect pest; Natural enemies; Survey; Damage; Population dynamics; Chiangrai province; เพลี้ยกระโดดหลังขาว; เพลี้ยกระโดดสีน้ำตาล; ข้าว; พันธุ์สันป่าตอง 1; พันธุ์สุพรรณบุรี 1; พันธุ์อ่อนแอ; พันธุ์ต้านทาน; การสำรวจแมลงศัตรูพืช; กับดักแสงไฟ; การเปลี่ยนแปลงสภาพภูมิอากาศ; ภาวะโลกร้อน; การทำลายของแมลงศัตรูพืช; การประเมินความเสียหาย; การทำลายของแมลงศัตรูพืช; จ.เชียงราย.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5696

Entomological research during 1975
Provedor de dados: 106
Autores: Somnuk Wongthong; Somporn Patanakamjorn; Young, W.R.; Anuchit Chinajariyawong; Pramual Chaitooptong; Surachate Jamornmarn.
8 ill., 6 tables
Palavras-chave: Corn; Maize; Sorghum; Entomology research; Insect pests; Shoot fly; Stem borers; Varieties; Pest resistance; Population dynamics; Yields; ข้าวโพด; ข้าวฟ่าง; กีฏวิทยา; แมลงศัตรูพืช.
Ano: 1975
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3843

Estimation of phenotypic diversity in field populations of Magnaporthe grisea from two upland rice cultivars
Provedor de dados: 102
Autores: Silva,Gisele B.; Zambolim,Laércio; Prabhu,Anne S.; Araújo,Leila G.; Zimmermann,Francisco J.P.
The phenotypic diversity of Magnaporthe grisea was evaluated based on leaf samples with blast lesions collected from eight commercial fields of the upland rice cultivars 'BRS Primavera' and 'BRS Bonança', during the growing seasons of 2001/2002 and 2002/2003, in Goias State. The number of M. grisea isolates from each field utilized for virulence testing varied from 28 to 47. Three different indices were used based on reaction type in the eight standard international differentials and eight Brazilian differentials. The M. grisea subpopulations of ´Primavera' and 'Bonança', as measured by Simpson, Shannon and Gleason indices, showed similar phenotypic diversities. The Simpson index was more sensitive relation than those of Shannon and Gleason for pathotype...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Pyricularia grisea; Population dynamics; Rice blast; Pathotypes; Virulence.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000100001

Nematode community, trophic structure and population fluctuation in soybean fields
Provedor de dados: 102
Autores: Gomes,Gilmar S.; Huang,Shiou P.; Cares,Juvenil E.
Temporal (monthly in three fields for 12 months) and spatial (once in 23 fields during March-April) samplings were conducted in the major soybean (Glycine max)-growing region of the Brazilian Federal District. Fifty-three nematode genera were found in both samplings, but 13 were detected only by the temporal sampling, and one only by the spatial sampling. Fifty-three percent were plant-parasites, 35% were bacterivores, and about 12% were fungivores, predators and omnivores constituted the community that was dominated by the genera Helicotylenchus (40% of total abundance), Acrobeles (15%), Cephalobus (7.6%), Meloidogyne(5.6%) and Pratylenchus (4.9%). Heterodera glycines was not found in this study. There were no differences in ten ecological measurements...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Population dynamics; Nematode ecology; Temporal and spatial samplings; Functional groups.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000300006

Reappearance and seasonality of Phyllorhiza punctata von Lendenfeld (Cnidaria, Scyphozoa, Rhizostomeae) medusae in southern Brazil
Provedor de dados: 104
Autores: Haddad,Maria A.; Nogueira Júnior,Miodeli.
The scyphozoan Phyllorhiza punctata von Lendenfeld, 1884 (Mastigiidae), known only from Indo-Pacific waters prior to the 1950s, is today found far from its original distribution, probably due to human activities. First seen in 1955 in Brazilian waters, medusae were found in southern and southeastern coasts, disappearing (at least as a medusa) in the early 1960's. Another population was found in the late 1990's, in the state of Bahia, and again in late 2001, many sightings were reported along the coasts of Paraná and Santa Catarina (25º20'S, 48º12'W to 27º26'S, 48º22'W). A large summer bloom, followed by decline and disappearance in winter and spring, occurs every year since then. The reasons for this recent mass occurrence are unknown. Despite few...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Introduced species; Jellyfish; Population dynamics; Seasonal.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000300030

Himenópteros associados a Solanum gilo raddi (Solanaceae)
Provedor de dados: 104
Autores: Picanço,Marcelo; Casali,Vicente Wagner Dias; Oliveira,Ivênio Rubens de; Leite,Germano Leão Demolin.
The Hymenoptera fauna associated to Solanum gilo was studied. There were 21 species of Hymenoptera from eight families. It was observed Homalotylus flaminus (Dalman, 1820) (Encyrtidae) parasiting the adults of Cycloneda sanguinea Linnaeus, 1763 (Coleoptera, Coccinellidae) and Chalcididae parasiting caterpillars of Mechanitis pofymnia casabranca Haensch, 1905 (Lepidoptera, Nymphalidae, Ithomiinae, Sthomiinae). Vespidae were observed preying both M. pofymnia casabranca and Diabrotica speciosa Germar, 1824 (Coleoptera, Chrysomelidae) adults. Halictidae, Andrenidae and Anthophoridae, were observed visiting flowers and Trigona spinipes (Fabricius, 1793) (Apidae) attacking fruits and stem ápices. The most abundant Hymenoptera were Formicidae; Cremalogaster sp....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Entomofauna; Population dynamics; Protocooperation.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000400006

Population Dynamics Modeling of Arapaima gigas
Provedor de dados: 36
Autores: Coutinho,Eliane dos Santos de Souza; Bevilacqua,Luiz; Queiroz,Helder Lima de.
Pirarucu (Arapaima gigas) has been of the most important natural fishing resources of the Amazon region. Due to its economic importance, and the necessity to preserve the species hand, field research concerning the habits and behavior of the pirarucu has been increasing for the last 20 years. The aim of this paper is to present a mathematical model for the pirarucu population dynamics considering the species peculiarities, particularly the male parental care over the offspring. The solution of the dynamical systems indicates three possible equilibrium points for the population. The first corresponds to extinction; the third corresponds to a stable population close to the environmental carrying capacity. The second corresponds to an unstable equilibrium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pirarucu (Arapaima gigas); Population dynamics; Mamirauá; Mathematical Modeling.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000200012

Is size structure a good measure of future trends of plant populations? an empirical approach using five woody species from the Cerrado (Brazilian savanna)
Provedor de dados: 39
Autores: Virillo,Carolina Bernucci; Martins,Fernando Roberto; Tamashiro,Jorge Yoshio; Santos,Flavio Antonio Maës dos.
Size distributions in woody plant populations have been used to assess their regeneration status, assuming that size structures with "reverse-J" shapes represent stable populations. We present an empirical approach of this issue using five woody species from the Cerrado. Considering count data for all plants of these five species over a 12-year period, we analyzed size distribution by: a) plotting frequency distributions and their adjustment to the negative exponential curve and b) calculating the Gini coefficient. To look for a relationship between size structure and future trends, we considered the size structures from the first census year. We analyzed changes in number over time and performed a simple population viability analysis, which gives the mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gini coefficient; Population dynamics; Reverse-J shape; Population viability analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000300012

Life History Parameters of Genypterus brasiliensis (Teleostei: Ophidiidae), an Endemic Fisheries Resource of the Southwestern Atlantic
Provedor de dados: 42
Autores: TOMÁS,ACÁCIO R.G.; ELEUTERIO,CELSO L.T.; VELASCO,GONZALO.
Abstract: Genypterus brasiliensis, a demersal fish of large size (1.3 m of total length), occurs in the southwest Atlantic (23 to 38oS) and well appreciated due to the quality of its flesh. It was analyzed through longline and trawl fisheries, and the average length and weight of 724 specimens were significantly different between them, with the biggest and heaviest specimens caught by the former. The weight-length relationships were significantly different based upon sex: females Wt=4x10-7Lt3.3799; r2=0.97; n=262; p&lt;0.001, and males: Wt=4x10-7Lt3.3886; r2=0.95; n=190; p&lt;0.001. Using the otoliths readings for 153 specimens (APE of 2% and CV of 4.2%), the growth parameters estimates reveal statistical differences between sexes (p=0.05; r2=0.889). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Endemism; Fishes; Fisheries.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500609

A new analytical formulation of retention effects on particle diffusion processes
Provedor de dados: 42
Autores: Bevilacqua,Luiz; Galeão,Augusto C.N.R.; Costa,Flavio P.
The ultimate purpose of this paper is to present a new analytical formulation to simulate diffusion with retention in a reactive medium under stable thermodynamic conditions. The analysis of diffusion with retention in a continuum medium is developed after the solution of an equivalent problem using a discrete approach. The new law may be interpreted as the reduction of all diffusion processes with retention to a unifying phenomenon that can adequately simulate the retention effect namely a circulatory motion. It is remarkable that the governing equation requires a fourth order differential term as suggested by the discrete approach. The relative fraction of diffusion particles β is introduced as a control parameter in the diffusion-retention law as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffusion; Retention; Constitutive law; Discrete approach; Population dynamics; Fourth order differential equations.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400031

Flutuação populacional de tripes, Thrips tabaci Lind., em cebola em Ituporanga, Santa Catarina
Provedor de dados: 44
Autores: Gonçalves,Paulo A. S.
The population dynamics of Thrips tabaci Lind. was evaluated for onion (Allium cepa) planted in July, August and September at the Ituporanga Experimental Station, EPAGRI S.A., Santa Catarina State, Brazil, from 1985 to 1988. For each planting date cv. Baia Periforme, Jubileu, EMPASC 351 Sel. Crioula and Norte 14 were used. Severe infestation in all cultivars was observed after mid-October. The population peak of T. tabaci occurred between the end of October and mid-November. Cultivars transplanted early tended to escape from high population densities. Populations of T. tabaci peaked during bulb formation and decreased thereafter.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Thysanoptera; Allium cepa; Population dynamics.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591997000200019

Weather, cultivar and density-dependent processes influence on aphid in alfalfa
Provedor de dados: 53
Autores: Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Rassini,Joaquim Bartolomeu.
It is important to understand the effects of weather, insect density and plant cultivar on insect abundance to predict and prevent crop production loss. The present work investigated the influence of such factors on aphid in alfalfa during one year (short term). Data was collected from September/1997 to August/1998 at Canchin Farm (CCPSE-EMBRAPA), São Carlos, State of São Paulo, Brazil. Weather conditions had, in general, little effect on the variation of aphid populations, but Therioaphis maculata abundance was negatively correlated to humidity. Moreover, high maximum temperatures and low levels of rainfall possible favored T. maculata high abundance on Crioula and P3 cultivars. Therefore, appropriate management of this species is required during hot and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbivory; Hemiptera; Medicago sativa; Resistance; Population dynamics.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052007000200012

Population dynamics of Musca domestica (Diptera: Muscidae): experimental and theoretical studies at different temperatures
Provedor de dados: 52
Autores: Tardelli,Carina Aparecida; Godoy,Wesley Augusto Conde; Mancera,Paulo Fernando Arruda.
In the present study, the population dynamics of M. domestica was evaluated at two different temperatures, 20 and 30ºC. The dynamics was modeled using a density-dependent model of population growth. The temperatures investigated in this study produced no qualitative change in terms of dynamic behaviour, i. e. the population dynamics of M. domestica was characterized by a stable equilibrium at both temperatures. However, the steady state was influenced by the results obtained at different temperatures. The difference between the eigenvalues obtained at the two temperatures was probably the cause of the difference between the distinct steady states. The implications of these results for the population dynamics of M. domestica are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Musca domestica; Density-dependent model; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500013

Population dynamics and net primary production of the aquatic macrophite Nymphaea rudgeana C. F. Mey in a lotic environment of the Itanhaém River basin (SP, Brazil)
Provedor de dados: 57
Autores: CAMARGO,A. F. M.; FLORENTINO,E. R.
In this paper we evaluated the population dynamics and obtained estimates of the net primary production of the aquatic macrophyte Nymphaea rudgeana in an arm of the Itanhaém River (São Paulo State, Brazil). This species presents, in the studied area, a broad seasonal variation of biomass. As from November (13.1 g DW/m²) we observed a gradual increase of biomass that reached a maximum in February (163.1 g DW/m²). Then, the biomass decreased, maintaining low levels until a new growth period. The reduction of biomass is associated to the development of floating aquatic macrophytes (Pistia stratiotes and Salvinia molesta) and, subsequently to environmental factors (higher salinity values) that are unfavorable to their development. The net primary production of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic macrophyte; Nymphaea rudgeana; Population dynamics; Net primary production; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100011

Application of deterministic model of isothermals for population dynamics of Synthesiomyia nudiseta (Diptera, Muscidae)
Provedor de dados: 57
Autores: ALMEIDA,J. R. de; OLIVEIRA,S. G. de; BORGES,I. L.; D'ALMEIDA,J. M.
The isothermal deterministic model adherence was studied to evaluate the population dinamic of Synthesiomyia nudiseta (Diptera, Muscidae). The linear form of equation obtained for the experiments in the several phases, were for Egg: 1/D = -0.18 + 0.02 . T; Larva: 1/D = -0.028 + 0.01. T; Pupa: 1/D = -0.069 + 0.01 . T; and Adult: 1/D = -0.4178 + 0.02 . T. In function of temperature, S. nudiseta can present from 4.18 to 8.95 and from 4.91 to 8.99 generations per year, when calculated through the equations of development and through the simulations, respectively. And the higher the temperature the larger the generation number. Through variance analysis it was verified the significance for the regression equations in relation to the annual generation number...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deterministic model; Population dynamics; Synthesiomyia nudiseta; Diptera.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100018

Identification of tiller age categories based on morphogenetic responses of continuously stocked marandu palisade grass fertilised with nitrogen
Provedor de dados: 65
Autores: Paiva,Adenilson José; Pereira,Lilian Elgalise Techio; Silva,Sila Carneiro da; Dias,Raphael Antonio Prado.
Nitrogen fertilization augments tiller appearance and death, modifying the age profile of tiller population. Tillers from different age categories present distinct responses to environmental factors and management practices characterized by variation in their morphogenetic responses, which interfere in the dynamics of the herbage accumulation process. In that context, rates of leaf appearance and elongation and leaf lifespan were used as indicators to identify tiller age categories of continuously stocked marandu palisade grass managed at 30cm and subjected to nitrogen fertilization regimes using cluster analysis. Analysis was based on the average distance method using combined means of the response-variables studied, and the results used to build a...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Morphogenesis; Tiller age category; Population dynamics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000500867

Intensity of Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) and Liriomyza spp. (Diptera: Agromyzidae) attacks on Lycopersicum esculentum Mill. Leaves
Provedor de dados: 64
Autores: Leite,Germano Leão Demolin; Picanço,Marcelo; Jham,Gulab Newandran; Marquini,Flávio.
The objective of this study was to determine the effect of height of leaves in the canopy of plants, leaf organic compounds, concentrations of leaf nitrogen and potassium, leaf trichomes and cristalliferous idioblasts densities on the attack intensity of three tomato (Lycopersicon esculentum Mill. cv. Santa Clara) crops by Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) and Liriomyza spp. (Diptera: Agromyzidae), under field conditions. The experimental design was arranged in randomized blocks, with three replications, each being one tomato crop. Analysis of variance and the Tukey’s multiple range test (5% significance) were used to test the effect of canopy height, trichome and cristalliferous idioblasts densities on the number of mines produced by T....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomato; Population dynamics; Tomato leafminer; Terpenes.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542004000100005