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| Registros recuperados: 14 | |
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| Silva, Alexandra; Garrido, Susana; Ibaibarriaga, Leire; Pawlowski, Lionel; Riveiro, Isabel; Marques, Vitor; Ramos, Fernando; Duhamel, Erwan; Iglesias, Magdalena; Bryere, Philippe; Mangin, Antoine; Citores, Leire; Carrera, Pablo; Uriarte, Andres. |
| This work investigated adult-mediated connectivity and spatial population structure of sardine in the European Atlantic waters. The spatial and temporal progress of cohorts was modelled using abundance-at-age survey data by area in the period 2000 to 2016, covering the region from the northern Bay of Biscay to the eastern Gulf of Cadiz. A novel methodology was used to calculate indices of cohort movement between areas. Movement was relatively low between three large regions, the Bay of Biscay, the northern Spanish and Portuguese waters and the Gulf of Cadiz, each hosting a recruitment hotspot. On the other hand, one half of the sardines recruited in North Portugal and a quarter of those recruited in Southwest Portugal moved to northern Spanish waters and... |
| Tipo: Text |
Palavras-chave: Metapopulation; Source-sink dynamics; Adult-mediated connectivity; Cohort dispersal; Small pelagic fishes; Stock identity; Fisheries management. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00465/57661/59856.pdf |
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| Wethey, David S.; Woodin, Sarah A.; Berke, Sarah K.; Dubois, Stanislas. |
| The ecosystem engineer onuphid polychaete Diopatra biscayensis has a continuous population in the Bay of Biscay from the Cantabria coast in Spain to southern Brittany in France. A group of disjunct populations also are found in the English Channel, separated from the Biscay population by more than 400 coastal kilometers. It remains unclear whether D. biscayensis is native to the Bay of Biscay; it is also debated whether the disjunct populations in the English Channel are relics of a formerly continuous population, or the product of recent introductions through aquaculture. Here, we use climate hindcasts to explore hypotheses about the D. biscayensis historical distribution in Europe. If D. biscayensis is native, its range would have been restricted to... |
| Tipo: Text |
Palavras-chave: Climate change; Biogeography; Metapopulation; Diopatra; Historical projections. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00356/46711/46974.pdf |
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| Sanchirico, James N.; Wilen, James E.. |
| We present a bioeconomic model of a harvesting industry operating over a heterogeneous environment comprised of discrete biological populations interconnected by dispersal processes. The model generalizes the H. S. Gordon [1954]/V. Smith [1968] model of open-access rent dissipation by accounting for intertemporal and spatial "Ricardian" patterns of exploitation. This model yields a simple, but insightful, framework from which one can investigate factors that contribute to the evolution of resource exploitation patterns over space and time. For example, we find that exploitation patterns are driven by biological and fleet dispersal and biological and economic heterogeneity. We conclude that one cannot really understand the biological processes operating in... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Renewable resources; Bioeconomics; Spatial modeling; Metapopulation; Environmental Economics and Policy; Q22; R19. |
| Ano: 2000 |
URL: http://purl.umn.edu/10513 |
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| Brito,Daniel. |
| Habitat fragmentation may cause population subdivision, affecting genetic variation, leading to heterozygosity loss and increased inbreeding, and contributing to population extinction. However, some genetic models have shown that under some conditions, population subdivision can favor heterozygosity and allelic diversity, and small populations may adapt to inbreeding. Here I investigate the relationship between population subdivision and genetic diversity for the marsupial Micoureus paraguayanus (Tate, 1931) using the program Vortex. Hypothetical populations of 100 and 2000 individuals were partitioned into 1, 2, 5 or 10 populations that were linked by varying rates of dispersal and also by sex-biased dispersal. Results suggested that heterozygosity and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic drift; Genetic load; Habitat fragmentation; Inbreeding; Metapopulation; Population viability analysis. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400013 |
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| Du Pontavice, Hubert; Randon, Marine; Lehuta, Sigrid; Vermard, Youen; Savina-rolland, Marie. |
| In fisheries science, a mismatch between the delineation of a fish stock and the underlying biological population can lead to inaccurate assessment and management. Previous results suggested a potential spatial structuration of the Eastern English Channel (EEC) stock of common sole, Solea solea, in three sub-populations. In this article, we propose to investigate the spatial population structure of common sole in the EEC using the von Bertalanffy Growth Function parameters as indicators of population segregation. In order to test the sub-population hypothesis and evaluate its robustness to data sources, we developed three models, all including an area effect on growth parameters. The first model was aimed at testing a potential data source effect (in... |
| Tipo: Text |
Palavras-chave: Key-words; Von Bertalanffy growth function; Stock structuration; Solea solea; Flatfish; Life-history traits; Metapopulation. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00445/55625/57301.pdf |
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| Mira, Sara; Arnaud-haond, Sophie; Palma, Luis; Cancela, Maria Leonor; Beja, Pedro. |
| In bird species that have a high movement capacity, dispersal may connect subpopulations over vast geographical regions, with important consequences for the design of conservation management strategies. Here we used a molecular approach to infer the patterns and rates of dispersal among eight Mediterranean subpopulations of the endangered Bonelli's Eagle, based on 245 individuals screened at 17 microsatellite loci. There was moderate genetic differentiation between subpopulations sampled in the western (Iberia and Morocco) and eastern (Cyprus) Mediterranean, whereas differentiation among subpopulations in the former region was weak to moderate and followed a pattern of isolation by distance. Within the western Mediterranean, the small, peripheral and... |
| Tipo: Text |
Palavras-chave: Dispersal; Ecological divergence; Metapopulation; Philopatry; Population fragmentation. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00148/25924/24018.pdf |
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| Lett, Christophe; Tri Nguyen-huu,; Cuif, Marion; Saenz-agudelo, Pablo; Kaplan, David. |
| Three indices of larval retention have been used in the literature to assess the tendency for self-maintenance of local marine populations: local retention (LR), self-recruitment (SR), and relative local retention (RLR). Only one of these, LR, defined as the ratio of locally produced settlement to local egg production, has a clear relationship to self-persistence of individual sites. However, SR, the ratio of locally produced settlement to settlement of all origins at a site, is generally easier to measure experimentally. We use theoretical, simulation, and empirical approaches to bridge the gap between these different indices, and demonstrate that there is a proportional relationship between SR and LR for metapopulations close to a stable state and with... |
| Tipo: Text |
Palavras-chave: Connectivity; Larval dispersal; Lifetime egg production; Local retention; Marine reserve; Metapopulation; Network persistence; Population persistence; Self-persistence; Self-recruitment. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00275/38628/81243.pdf |
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| Savina-, Marie; Lunghi, Mathias; Archambault, B.; Baulier, Loic; Huret, Martin; Le Pape, Olivier. |
| Simulating fish larval drift helps assess the sensitivity of recruitment variability to early life history. An individual-based model (IBM) coupled to a hydrodynamic model was used to simulate common sole larval supply from spawning areas to coastal and estuarine nursery grounds at the meta-population scale (4 assessed stocks), from the southern North Sea to the Bay of Biscay (Western Europe) on a 26-yr time series, from 1982 to 2007. The IBM allowed each particle released to be transported by currents, to grow depending on temperature, to migrate vertically depending on development stage, to die along pelagic stages or to settle successfully on a nursery, representing the life history from spawning to metamorphosis. The model outputs were analysed to... |
| Tipo: Text |
Palavras-chave: Hydrodynamic model; Individual-based model; Larval supply; Nursery grounds; Recruitment variability; Solea solea; Metapopulation; English Channel; Bay of Biscay; Southern North Sea. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00297/40775/39782.pdf |
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| Petitgas, Pierre; Grellier, Patrick; Duhamel, Erwan; Masse, Jacques; Doray, Mathieu. |
| Individual fish growth depends on internal population factors such as phenotypic variability as well as external factors such as past environmental conditions (temperature, food) and selective mortality (predation or fishing). In the anchovy, growth in the first year is key to population dynamics as it determines the potential energy allocated to reproduction as well as the capacity to occupy off-shore habitats. Further, in the recent past, the anchovy in the bay of Biscay has experienced collapse and recovery and the role played by growth in this history is unknown. Since 2001 with the spring acoustic survey series PelGas, we have monitored individual fish growth by measuring in the otolith the increments between annual rings, in addition to age... |
| Tipo: Text |
Palavras-chave: Anchovy; Biscay; Otoliths; Growth; Metapopulation. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00114/22550/20236.pdf |
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| Registros recuperados: 14 | |
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