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| Registros recuperados: 160 | |
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| García, S.. |
| Red porgy (Pagrus pagrus) fishery. Analysis of catches, nominal effort and landings structure in 2011. A descriptive analysis of red porgy (Pagrus pagrus) fishery within the Buenos Aires Coastal Ecosystem (BCE) and the Argentine continental shelf, between 34° S and 42° S, during 2011 was performed. The catches landed, of a total of 3,627 t, performed in a direct and incidental way by an heterogeneous fleet of 149 vessels belonging to five strata (Ia, Ib, Ic, IIa and IIb) in 1,527 fishing trips represented a 36.7% decrease as regards 2010. The spatiotemporal analysis allowed to determine that the highest yields of the species were obtained close to 50 m depth, that coincides with the highest surface temperatures in the area, that decrease in a... |
| Tipo: Journal Contribution |
Palavras-chave: Catch/effort; Landing statistics; Population structure; Coastal fisheries. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5509 |
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| Moura, Teresa; Jones, Emma; Clarke, Maurice W.; Cotton, Charles F.; Crozier, Paul; Daley, Ross K.; Diez, Guzman; Dobby, Helen; Dyb, Jan E.; Fossen, Inge; Irvine, Sarah B.; Jakobsdottir, Klara; Lopez-abellan, Luis J.; Lorance, Pascal; Pascual-alayon, Pedro; Severino, Ricardo B.; Figueiredo, Ivone. |
| Deep-water sharks exhibit species-specific reproductive strategies, which include segregation by sex, size and reproductive stage. However, due to the wide spatial distribution of most species, available information, usually collected at a regional scale, is usually not adequate to infer species reproductive spatial dynamics. This study draws together information on the distribution of reproductive stages of three species of squaliform sharks: Portuguese dogfish Centroscymnus coelolepis (Somniosidae), leafscale gulper shark Centrophorus squamosus (Centrophoridae) and birdbeak dogfish Deania calcea (Centrophoridae), gathering data from several geographical areas from the Atlantic, Indian and Pacific Oceans. For each species we analysed the sex ratio and the... |
| Tipo: Text |
Palavras-chave: Commercial fishery data; Deep-sea; Life stage; Population structure; Survey data. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00188/29902/29420.pdf |
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| Fromentin, Jean-marc. |
| In 1963, the leading fisheries targeting Atlantic bluefin tuna (Thunnus thynnus) in the Norwegian Sea and North Sea suddenly collapsed without any warning. Little is known about this collapse and several hypotheses have been put forward, such as changes in migratory routes, recruitment failure or eradication of a sub-population: all of these hypotheses could result from natural causes and/or from overfishing. To help explain this mysterious event, an original data set of the main bluefin tuna fisheries of the 20th century, including total catch and size composition of the catch, has been compiled and analysed. The results reveal a strong and unambiguous link between the Nordic purse seine and Spanish trap fisheries during the 1950s and 1960s. However, this... |
| Tipo: Text |
Palavras-chave: Thunnus thynnus; Retrospective analysis; Population structure; Migration patterns; Fisheries collapse. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6425.pdf |
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| De Cubber, Lola; Lefebvre, Sebastien; Fisseau, Charline; Cornille, Vincent; Gaudron, Sylvie Marylene. |
| Arenicola spp. are marine benthic polychaetes dug for bait by anglers. Without regulation, this activity can lead to the decrease of lugworms' population meanwhile affecting the physical characteristics of the beach and the biodiversity. Here, we identified through morphology and genetics two species of lugworms, Arenicola marina and A. defodiens, within a Marine Protected Area of the Eastern English Channel (France). For each species, abundance and spatial distribution were assessed using a stratified random sampling and interpolation at four studied sites, as well as some life-history traits. These data were compared to lugworms' collection data to estimate its sustainability and to provide potential management measures. At one site, A. marina was... |
| Tipo: Text |
Palavras-chave: Arenicola marina; Arenicola defodiens; Spawning; Population structure; Size at first maturity; Recreational fisheries; Conservation; English channel. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00451/56284/60474.pdf |
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| Silva,Jersei N.; Oliveira,Guilherme de; Rocha,Sérgio S. da. |
| ABSTRACT We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat was dominated by one macrophyte species: Eleocharis sp. (M1), Cabomba sp. (M2), and Nymphaea sp. (M3). The prawns were measured (carapace length), and categorized as juvenile males, adult males, juvenile females, non-ovigerous adult females and ovigerous adult females. An analysis of variance (ANOVA) was used to compare the number and size of individuals. The sex ratio and frequency of ovigerous females in the three microhabitats were also calculated. The sex... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Macrophyte; Population structure; Reproduction; Spatial distribution. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100227 |
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| Silva,Daniela de M. e; Cruz,Aparecido D. da; Bastos,Rogério P.; Telles,Mariana P. de C.; Diniz-Filho,José Alexandre F.. |
| To assess genetic structure and phenotypic diversity of Eupemphix nattereri Steindachner, 1863, morphometric and molecular analyses were carried out for nine populations from the State of Goiás. A total of 11 morphometric traits were evaluated and genetic information was estimated using RAPD markers. Genetic and phenotypic distances were determined as a function of geographical origin. Correlation among genetic, morphometric, micro, and macroenviromental were analyzed by the Mantel test. Genetic data indicated high levels of genetic diversity (Φst= 0.3) among the nine populations. Mantel tests did not reveal a significant positive correlation between genetic and geographical distances, indicating that locally geographical populations were not genetically... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eupemphix nattereri; Morphology; RAPD markers; Gene flow; Population structure. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400013 |
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| Botero, L.. |
| Se estudia una población de Strombus gigas localizada a 12 m de profundidad en la Ensenada de Nenguange. La población ocupa un área aproximada de 98400 m². La densidad promedio más alta registrada fue de 1 caracol/14 m * y la más baja de 1 caracol/ 33 m² Estas variaciones en la densidad parecen estar relacionados con las condiciones ambientales, especialmente agitación y temperatura del agua. Los caracoles de esta población se caracterizan por una concha masiva totalmente recubierta de algas, corales, esponjas y otros organismos. El grueso labio externo es constantemente erodado por animales perforadores y reemplazado en grosor por el caracol. Se encontró una sola clase de tamaños de individuos y una casi completa ausencia de juveniles. Se registró... |
| Tipo: Journal Contribution |
Palavras-chave: Marine molluscs; Population structure; Shells; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115. |
| Ano: 1984 |
URL: http://hdl.handle.net/1834/4032 |
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| Brophy, Deirdre; Haynes, Paula; Arrizabalaga, Haritz; Fraile, Igaratza; Fromentin, Jean-marc; Garibaldi, Fulvio; Katavic, Ivan; Tinti, Fausto; Karakulak, F. Saadet; Macias, David; Busawon, Dheeraj; Hanke, Alex; Kimoto, Ai; Sakai, Osamu; Deguara, Simeon; Abid, Nouredinne; Santos, Miguel Neves. |
| Two stocks of bluefin tuna (Thunnus thynnus) inhabit the north Atlantic; the western and eastern stocks spawn in the Gulf of Mexico and the Mediterranean Sea respectively. Trans-Atlantic movements occur outside spawning time whereas natal homing maintains stock structure. Commercial fisheries may exploit a mixed assemblage of both stocks. The incorporation of mixing rates into stock assessment is precluded by uncertainties surrounding stock discrimination. Otolith shape descriptors were used to characterise western and eastern stocks of Atlantic bluefin tuna in the present study and to estimate stock composition in catches of unknown origin. Otolith shape varied with length and between locations and years. Within a restricted size range (200-297-cm fork... |
| Tipo: Text |
Palavras-chave: Elliptical Fourier analysis; Population structure; Stock mixture analysis. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00346/45745/45381.pdf |
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| Oliveira,Aracele Prates de; Malhado,Carlos Henrique Mendes; Carneiro,Paulo Luiz Souza; Martins Filho,Raimundo; Silveira,Éderson Silva; Souza,Laaina de Andrade; Muniz,Lorena Mirelle Santos; Azevêdo,Danielle Maria Machado Ribeiro. |
| The objective of this study was to characterize the population genetic structure of the Gir breed in the Northeast of Brazil. The data used in this study were taken from pedigree information of 8,897 Gir animals between 1957 and 2007, obtained from the Brazilian Zebu Breeders Association (ABCZ). The program ENDOG was used to estimate the parameters based on the probability gene origin. From the amount of the studied animals, 67.22%, 18.41% and 3.15% had complete pedigree only on the first, second and third parentage, respectively. The number of ancestors that contributed for the reference population was 2,755, of which only 171 explain the 50% genetic variability of the population. The actual number of founder herds was 168 and the effective number of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ancestry; Inbreeding; Population structure. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000500011 |
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| Coimbra,Raphael Teodoro Franciscani; Miranda,Flávia Regina; Lara,Camila Clozato; Schetino,Marco Antônio Alves; Santos,Fabrício Rodrigues dos. |
| Abstract Cyclopes didactylus, commonly called silky anteater, is the smallest and least studied of the anteaters. It is an arboreal species occurring in rainforests, ranging from southern Mexico to Central and South America, with an apparently disjoint distribution between Amazon and Atlantic rainforests in Brazil. Although seven subspecies are recognized, little is known about its geographical variation. Thus, to evaluate the population dynamics and evolutionary history of the South American silky anteater, we analyzed 1542 bp sequences of the mitochondrial control region (CR), COI and Cyt-b genes of 32 individuals. Haplotype network, AMOVA and molecular dating analyses were performed and identified seven geographic clusters. The split of lineages... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xenarthra; Mitochondrial DNA; Population structure; Molecular dating; South America. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100040 |
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| CÁRDENAS,MARTHA; DANIES,GIOVANNA; TABIMA,JAVIER; BERNAL,ADRIANA; RESTREPO,SILVIA. |
| Phytophthora infestans, the causal agent of late blight disease in potato and other members of the Solanaceae family, is responsible for causing the Irish potato famine and, even today, it causes enormous economic losses all over the world. For the establishment of an adequate pest management strategy, the determination of the pathogen's population structure is required. To characterize P. infestans populations worldwide two allozymes, Gpi (Glucose-6-phospate isomerase) and Pep ( Pep tidase), the RG57 DNA RFLP fingerprinting probe, as well as resistance to the fungicide metalaxyl and mating type, have been used as markers. P. infestans populations in Mexico have been one of the main focuses of research in the population biology of this pathogen because... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytophthora infestans; Population structure; Late blight. |
| Ano: 2012 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000200001 |
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| Registros recuperados: 160 | |
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