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Registros recuperados: 188
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Biologie et dynamique des populations d’Anchois (Engraulis encrasicolus) des côtes mauritaniennes. OceanDocs
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
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Biologie et exploitation du poulpe Octopus vulgaris (Cuvier, 1797) des côtes mauritaniennes OceanDocs
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
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Biologie et pêche traditionnelle des crevettes pénéides dans l'embouchure d'un fleuve en milieur semi-aride (sud-ouest de Madagascar) ArchiMer
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 < salinity < 35; 25 degrees C < temperature < 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
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Biostatistiques et Processus Spatiaux National Institute of Agronomic Research
Chadoeuf, Joël.
Tipo: Working Paper Palavras-chave: Ecology; Epidemiology; Population dynamics; Biostatistics; Ecologie; Epidémiologie; Dynamique des populations; Biostatistique.
Ano: 2008 URL: http://hdl.handle.net/2174/186
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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 Neotropical Entomology
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
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Can fisheries-induced evolution shift reference points for fisheries management? ArchiMer
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
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Caractères biométriques de la Squille <Squilla mantis> dans les eaux tunisiennes OceanDocs
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
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Caractères biométriques de la squille squilla mantis dans les eaux tunisiennes OceanDocs
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
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Características ecológicas del pulpito Octopus Tehuelchus en tres ambientes del golfo San Matías OceanDocs
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
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Changes in the floristic composition of a terra firme rain forest in Brazilian Amazonia over on eight-year period in response to logging. Repositório Alice
CARVALHO, J. O. P. de.
Tipo: Artigo de periódico Palavras-chave: Floresta Nacional do Tapajos; Brasil; Botanica composition.; Composição Botânica; Dinâmica Populacional; Exploração Florestal.; Amazonia; Population dynamics; Resource management..
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/373210
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Cigarrinhas-das-pastagens no trópico úmido brasileiro. Repositório Alice
SILVA, A. de B..
Tipo: Parte de livro Palavras-chave: Cigarrinha da pastagem; Controle.; Biologia; Flutuação Populacional.; Deois; Pest control; Population dynamics; Zoology..
Ano: 1984 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/394796
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Coastal phytoplankton community dynamics and coexistence driven by intragroup density-dependence, light and hydrodynamics ArchiMer
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
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Como a temperatura afeta a dinâmica populacional de Tenuipalpus heveae (Acari, Tenuipalpidae) em clones de seringueira? Repositório Alice
SILVA, G. V.; PINTO, N. S.; SANTOS, R. S.; DAUD, R. D..
No presente estudo foi avaliado o efeito temperatura sobre a dinâmica populacional de Tenuipalpus heveae Baker em cinco clones de seringueira. O estudo foi conduzido de novembro de 2018 a janeiro de 2019 no jardim clonal de seringueiras do campo experimental da Embrapa Acr,e Rio Branco, estado do Acre, nos clones CPAA C18, FDR 5788, FX 3899, PB 312 e RRIM 600. Semanalmente foram retiradas, aleatoriamente, oito folhas do terço inferior da copa de quatro plantas de cada clone. Os ácaros coletados foram montados em lâminas de microscopia em meio de Hoyer. A relação entre a temperatura média e a abundância de T. heveae foi testada por meio de um modelo linear generalizado com distribuição de Poisson. Foi amostrado um total de 2.909 ácaros em 6.720 folíolos...
Tipo: Artigo de periódico Palavras-chave: Tenuipalpus heveae; Ruber tree; Plagas de plantas; Temperature resistance; Dinámica poblacional; Granjas de demostración; Embrapa Acre; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Seringueira; Hevea Brasiliensis; Caucho; Praga de Planta; Resistência a Temperatura; Dinâmica Populacional; Ácaro; Campo Experimental; Tenuipalpidae; Acari; Plant pests; Mites; Population dynamics; Demonstration farms.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1137786
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Computer simulation of the population dynamics of the yellow stem borer, Scirpophaga incertulas (Walker) International Rice Research Institute
Xia, Jingyuan.
132 l. : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Insect pests; Scirpophaga incertulas; Population dynamics; Simulation models; Mathematical models; Computers.
Ano: 1988 URL: http://hdl.handle.net/123456789/1184
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Comunidades de fungos micorrízicos arbusculares associados ao amendoim forrageiro em pastagens consorciadas no Estado do Acre, Brasil. Repositório Alice
MIRANDA, E. M. de; SILVA, E. M. R. da; SAGGIN JUNIOR, O. J..
O objetivo deste trabalho foi identificar e estimar a diversidade de comunidades de fungos micorrízicos arbusculares (FMAs) autóctones associados ao amendoim forrageiro (Arachis pintoi), em monocultivo e consorciado com outras forrageiras. A amostragem foi realizada em sete áreas, em Rio Branco, AC, sendo coletadas quatro amostras de solo em cada área, na profundidade de 0-10 cm, nas estações seca (junho de 2004) e chuvosa (janeiro de 2005). As áreas cultivadas com A. pintoi foram: monocultivo, consórcio com pastagens de gramíneas e outras leguminosas e como cobertura do solo em cafeeiro, além de capoeira e mata adjacentes como testemunhas. Foi verificada a ocorrência de 21 espécies de FMAs nas duas estações, sendo 18 espécies no período seco e 16 no...
Tipo: Artigo de periódico Palavras-chave: Amendoim forrageiro; Fungo micorrízico arbuscular (FMA); Rio Branco (AC); Acre; Amazônia Ocidental; Biología del suelo; Fertilidad del suelo; Dinámica poblacional; Hongos mycorrhizales.; Biologia do solo; Fertilidade do solo; Monocultura; Consorciação de cultura; Leguminosa forrageira; Fungo; Flutuação populacional; Estimulante de crescimento vegetal; Soil biology; Soil fertility; Mycorrhizal fungi; Population dynamics; Arachis pintoi..
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/657810
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Conocimiento biológico pesquero del recurso merluza (Merluccius hubbsi) y su pesquería en la República Argentina. OceanDocs
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
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Corales, formaciones arrecifales y blanqueamiento de 1987 en Bahía Portete (Guajira, Colombia) OceanDocs
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
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Crepidula fornicata L. (gastéropode) dans le bassin de Marennes-Oléron : structure, dynamique et production d'une population ArchiMer
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
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Crise de la production des coques (Cerastoderma edule ) en baie de Somme. 1. Synthese des connaissances biologiques. ArchiMer
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
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Crise de la production des coques (Cerastoderma edule ) en baie de Somme. 2. Impact de la dynamique biosedimentaire. ArchiMer
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
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