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Identification of tiller age categories based on morphogenetic responses of continuously stocked marandu palisade grass fertilised with nitrogen Ciência Rural
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
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Iheringichthys labrosus (Siluriformes: Pimelodidae) in the Piquiri River, Paraná, Brazil: population structure and some aspects of its reproductive biology Neotropical Ichthyology
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
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Impact de l'érosion côtière et éléments d'étude de vulnérabilité : example du Togo (Golfe de Guinée) OceanDocs
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
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Impact of the reproduction dynamics on genetic variation in the European flat oyster Ostrea edulis ArchiMer
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
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Influência climática e antrópica na abundância e riqueza de Calliphoridae (Diptera) em fragmento florestal da Reserva Biológica do Tinguá, RJ Neotropical Entomology
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
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Intensity of Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) and Liriomyza spp. (Diptera: Agromyzidae) attacks on Lycopersicum esculentum Mill. Leaves Ciência e Agrotecnologia
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
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Introduced herbivores and the Allee effect in animal-pollinated plants Ecología austral
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
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Is size structure a good measure of future trends of plant populations? an empirical approach using five woody species from the Cerrado (Brazilian savanna) Acta Botanica
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
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La Baie de Seine: Peuplements et especes benthiques en regime perturbe ArchiMer
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
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La praire (<Venus rosalina>) à l'Ouest du Banc d'Arguin (Mauritanie) : évaluation des stocks et dynamique des populations. OceanDocs
Diop, M..
Ce travail est consacré à l’étude du banc à <Venus rosalina> 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
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Large-scale genetic patchiness among NE Atlantic populations of the brittle star Ophiothrix fragilis ArchiMer
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 (< 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
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Larval connectivity of pearl oyster through biophysical modelling; evidence of food limitation and broodstock effect ArchiMer
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
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Le controle chimique et biologique de Lymnaea truncatula Mueller. Etude des effets a long terme ArchiMer
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
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Les pêcheries de buccin (Buccinum undatum L. : Gastropoda) du Golfe Normand-Breton. Eléments de gestion de la ressource ArchiMer
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
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Levantamento preliminar da ocorrência e flutuação populacional de cigarrinhas-das-pastagens em Brachiaria brizantha cv. Xaraés em Senador Guiomard, Acre. Repositório Alice
SUTIL, W. P.; SANTOS, R. S.; MESQUISTA, A. Q. de; OLIVEIRA, J. F. A. de; SILVA, E. N. da.
A presença de cigarrinhas-das-pastagens é relatada em várias partes do mundo, principalmente nas regiões tropicais e subtropicais. São insetos que causam os maiores prejuízos nas pastagens introduzidas e considerados as mais importantes pragas das pastagens no Brasil. Adultos e ninfas possuem o hábito sugador, permanecendo na pastagem na fase de ovo durante a estação seca e, no início do período chuvoso, os ovos eclodem e dão origem às ninfas, geralmente localizadas no interior de massas de espuma na base das plantas. O levantamento foi realizado para verificar a ocorrência de cigarrinhas-das-pastagens (adultos e ninfas) e sua flutuação populacional em Brachiaria brizantha cv. Xaraés (MG5), a fim de se realizar teste de controle químico, com dois produtos...
Tipo: Parte de livro Palavras-chave: Spittlebugs; Cigarrillos; Notozulia entreriana; Capim Xaraés; Brachiaria brizantha cv Xaraés; Palisade signalgrass; Fazenda Iquiri; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Plagas de plantas.; Pastos forrajeros; Pastizales; Dinámica poblacional; Praga de planta; Pastagem; Gramínea forrageira; Brachiaria brizantha; Dinâmica populacional; Cigarrinha das pastagens; Deois flavopicta; Plant pests; Pastures; Forage grasses; Urochloa brizantha; Population dynamics; Cercopidae..
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1030118
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Life expectancy of Helicoverpa armigera on chickpea Open Agri
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
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Life History Parameters of Genypterus brasiliensis (Teleostei: Ophidiidae), an Endemic Fisheries Resource of the Southwestern Atlantic Anais da ABC (AABC)
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<0.001, and males: Wt=4x10-7Lt3.3886; r2=0.95; n=190; p<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
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Linking basin-scale connectivity, oceanography and population dynamics for the conservation and management of marine ecosystems ArchiMer
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
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Long-term studies of Littorina obtusata and Littorina saxatilis populations in the White Sea ArchiMer
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
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Magellanic penguin (Spheniscidae) monitoring results for Magdalena Island (Chile) 2000 - 2008 OceanDocs
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
Registros recuperados: 188
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