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Registros recuperados: 39
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A hierarchical Bayesian model for embedding larval drift and habitat models in integrated life cycles for exploited fish ArchiMer
Rochette, Sebastien; Le Pape, Olivier; Vigneau, Joel; Rivot, Etienne.
This paper proposes a hierarchical Bayesian framework for modeling the life cycle of marine exploited fish with a spatial perspective. The application was developed for a nursery-dependent fish species, the common sole (Solea solea), on the Eastern Channel population (Western Europe). The approach combined processes of different natures and various sources of observations within an integrated framework for life-cycle modeling: (1) outputs of an individual-based model for larval drift and survival that provided yearly estimates of the dispersion and mortality of eggs and larvae, from spawning grounds to settlement in several coastal nurseries; (2) a habitat suitability model, based on juvenile trawl surveys coupled with a geographic information system, to...
Tipo: Text Palavras-chave: Eastern Channel (Western Europe); Habitat suitability model; Hierarchical Bayesian model; Hydrodynamic models; Integrated model; Larval drift; Life cycle; Nursery; Recruitment; Sole; Solea solea; Spatially structured.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00161/27243/25454.pdf
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Adult-mediated connectivity affects inferences on population dynamics and stock assessment of nursery-dependent fish populations ArchiMer
Archarnbault, Benoit; Le Pape, Olivier; Baulier, Loic; Vermard, Youen; Veron, Matthieu; Rivot, Etienne.
We explore how alternative hypotheses on the degree of mixing among local subpopulations affect statistical inferences on the dynamics and stock assessment of a harvested flatfish population, namely, the common sole population in the Eastern Channel (ICES area VIId). The current paradigm considers a single, well-mixed, spatially homogeneous population with juveniles from all coastal nursery grounds along the French and UK coasts that contribute to a single adult population and one pool of eggs. Based on the available data and ecological knowledge, we developed a spatial Bayesian integrated life-cycle model that consists of three subpopulations (one near the UK coast and two near the French coast, denoted UK, West FR and East FR, respectively) supported by...
Tipo: Text Palavras-chave: Solea solea; Spatial life-cycle model; Coastal nurseries; Connectivity; Stock assessment; Hierarchical bayesian model.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00333/44430/44231.pdf
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Are growth and density quantitative indicators of essential fish habitat quality? An application to the common sole Solea solea nursery grounds ArchiMer
Gilliers, Camille; Le Pape, Olivier; Desaunay, Yves; Morin, Jocelyne; Guerault, Daniel; Amara, Rachid.
Bio-indicators were measured on juvenile fish to assess the quality of eight coastal and estuarine nursery grounds in the Eastern English Channel and in the Bay of Biscay during 3 years. Growth (size and otolith daily increment width), body condition (morphometric index) and abundance of juvenile common soles were analysed together with xenobiotic concentrations (heavy metals and organic contaminants). Condition indices displayed important variations and did not allow relevant estimation of environmental quality. On the contrary, growth and density indicators showed good steadiness above years but varied among sites. In spite of difficulties of interpreting these indicators on such a meso-scale approach, analyses highlighted the estuaries of Seine and...
Tipo: Text Palavras-chave: Flatfish juvenile; Essential fish habitat quality; Quantitative bio indicators.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2016.pdf
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Changes in occurrence and abundance of northern/southern flatfishes over a 20-year period in a coastal nursery area (Bay of Vilaine) and on the eastern continental shelf of the Bay of Biscay ArchiMer
Desaunay, Yves; Guerault, Daniel; Le Pape, Olivier; Poulard, Jean-charles.
Several works have demonstrated trends in the distribution of fish species relative to global warming. This study investigated whether similar trends have occurred for selected flatfish species on the continental shelf of the Bay of Biscay. These species were used as indicators and changes in their Populations were studied in a coastal nursery ground,where flatfish juveniles are concentrated as well as on the entire shelf. Previous studies analysing changes in sea surface temperature for the continental shelf indicate that winter warming occurred in the 1980s and 1990s. Sixteen autumn cruises conducted since 1981 in the Bay of Vilaine nursery area and I I autumn cruises since 1987 over the entire shelf provided data on a nearly annual basis for the...
Tipo: Text Palavras-chave: Bay of Biscay; Ocean warming; Spatial distribution; Flatfish.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3962.pdf
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Combining indicator trends to assess ongoing changes in exploited fish communities: diagnostic of communities off the coasts of France ArchiMer
Rochet, Marie-joelle; Trenkel, Verena; Bellail, Robert; Coppin, Franck; Le Pape, Olivier; Mahe, Jean-claude; Morin, Jocelyne; Poulard, Jean-charles; Schlaich, Ivan; Souplet, Arnauld; Verin, Yves; Bertrand, Jacques.
We present a method for combining individual indicator results into a comprehensive diagnostic of fishing impacts on fish populations and communities. A conceptual framework for interpreting combined trends in a set of simple indicators is proposed, relying beforehand on qualitative expectations anchored in ecological theory. The initial state of the community is first assessed using published information. Which combinations of trends are acceptable or undesirable is decided, depending on the initial status. The indicators are then calculated from a time-series and their time trends are estimated as the slopes of linear models. Finally, the test results are combined within the predefined framework, providing a diagnostic on the dynamics of fishing impacts...
Tipo: Text Palavras-chave: Scientific surveys; Multispecies fisheries; Indicators; Ecosystem approach to fisheries management.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-773.pdf
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Comparaison de la qualite des zones de nourriceries cotieres du littoral francais a partir de l'etude d'indices de condition mesures sur des juveniles de soles ArchiMer
Gilliers, Camille; Amara, Rachid; Bergeron, Jean-pierre; Le Pape, Olivier; Desaunay, Yves.
Coastal and estuarine ecosystems provide nursery habitat for various marine species. Habitat quality has potential effects on growth and survival of fish juveniles. As quality can not be measured directly, we have used two kind of condition indices to assess growth and nutritional status of 0-group soles juveniles : - morphometric indices - biochemical indice Biochemical indice values show that each area provides good feeding condition. Unlikely, morphometric condition factors show differences in habitat quality between eastern Channel and Bay of Biscay. Juveniles have better condition in the eastern Channel. Condition indices didn’t enable us to find any general relationship between human effects and habitat quality.
Tipo: Text Palavras-chave: Nourriceries; Qualité; Indices de condition; Juvéniles du groupe.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00132/24364/22505.pdf
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Coupling hydrodynamic and individual-based models to simulate long-term larval supply to coastal nursery areas ArchiMer
Rochette, Sebastien; Huret, Martin; Rivot, Etienne; Le Pape, Olivier.
For many marine fish species, recruitment is strongly related to larval survival and dispersal to nursery areas. Simulating larval drift should help assessing 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 population scale in the eastern Channel on a 14-yr time series, from 1991 to 2004. The IBM allowed each particle released to be transported by currents from the hydrodynamic model, to grow with temperature, to migrate vertically giving stage development, and possibly to die according to drift duration, representing the life history from spawning to...
Tipo: Text Palavras-chave: Eastern Channel; Hydrodynamic model; Individual-based model; Larval supply; Nursery grounds; Recruitment variability; Solea solea.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00085/19598/17236.pdf
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Dynamics of an estuarine nursery ground: the spatio-temporal relationship between the river flow and the food web of the juvenile common sole (Solea solea, L.) as revealed by stable isotopes analysis ArchiMer
Kostecki, Caroline; Le Loc'H, F.; Roussel, J. -m.; Desroy, Nicolas; Huteau, D.; Riera, Pascal; Le Bris, H.; Le Pape, Olivier.
Estuaries are essential fish habitats because they provide nursery grounds for a number of marine species. Previous studies in the Bay of Vilaine (part of the Bay of Biscay, France) have underlined the estuarine dependence of juvenile common sole (Solea solea, L) and shown that the extent of sole nursery grounds was positively influenced by the variability of the river flow. In the present study, stable carbon and nitrogen isotopes were used to describe the trophic network until the young-of-the-year sole and to compare interannual variations in the dominant trophic pathways in the sole nursery areas in this bay. Particulate organic matter (POM), sediment organic matter (SOM), microphytobenthos, benthic invertebrate sole prey and young-of-the-year common...
Tipo: Text Palavras-chave: Juvenile Common Sole; Stable Isotopes; Estuarine Nursery Grounds; Food Web; Eastern Atlantic.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11923/8641.pdf
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Eating up the world's food web and the human trophic level ArchiMer
Bonhommeau, Sylvain; Dubroca, Laurent; Le Pape, Olivier; Barde, Julien; Kaplan, David; Chassot, Emmanuel; Nieblas, Anne-elise.
Trophic levels are critical for synthesizing species' diets, depicting energy pathways, understanding food web dynamics and ecosystem functioning, and monitoring ecosystem health. Specifically, trophic levels describe the position of species in a food web, from primary producers to apex predators (range, 1-5). Small differences in trophic level can reflect large differences in diet. Although trophic levels are among the most basic information collected for animals in ecosystems, a human trophic level (HTL) has never been defined. Here, we find a global HTL of 2.21, i.e., the trophic level of anchoveta. This value has increased with time, consistent with the global trend toward diets higher in meat. National HTLs ranging between 2.04 and 2.57 reflect a...
Tipo: Text Palavras-chave: Human ecology; Nutrition transition; Trophic ecology.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00171/28190/26609.pdf
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Effect of an invasive mollusc, American slipper limpet Crepidula fornicata, on habitat suitability for juvenile common sole Solea solea in the Bay of Biscay ArchiMer
Le Pape, Olivier; Guerault, Daniel; Desaunay, Yves.
This study describes the effect of an invasive mollusc, the slipper limpet Crepidula fornicata, on the distribution and abundance of young-of-the-year sole Solea solea in coastal nursery areas, based on beam-trawl surveys in the Bay of Biscay (France) over a 3 yr period (2000 to 2002). As habitat suitability for juvenile sole varies according to bathymetry and sediment structure, these factors and the density of the slipper limpet were used as descriptors in generalised linear models of habitat suitability to characterise the distribution of juvenile sole. The models were based on a delta distribution, coupling a binomial model testing for the presence of juvenile sole with a log-normal distribution for density when juveniles were known to be present....
Tipo: Text Palavras-chave: Solea solea; Nursery ground; Habitat suitability models; Crepidula fornicata; Invasive species; Bay of Biscay.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00000/10854/7579.pdf
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Effect of nursery habitat degradation on flatfish population: Application to Solea solea in the Eastern Channel (Western Europe) ArchiMer
Rochette, S.; Rivot, Etienne; Morin, Jocelyne; Mackinson, S.; Riou, Philippe; Le Pape, Olivier.
Estuaries and coastal waters are essential nursery habitats for many marine species, and especially for flatfishes. Thus, investigating how anthropogenic disturbances affect the quality of these habitats is of major importance to understand their consequences on the population renewal of marine species. The aim of the present study was to analyse the effects of estuarine habitat degradation on the population of the common sole in the Eastern Channel, a key species in the fish community and fisheries in this area. We especially focused on the drastic drop in the surface area and on the low water quality of the Seine estuary, the main river of the Eastern Channel. A geographic Information System (GIS) was used to develop quantitative maps of sole nursery...
Tipo: Text Palavras-chave: Solea solea; Nursery; Habitat Mapping; Anthropogenic Disturbance; Seine Estuary; Recruitment.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11921/9799.pdf
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Etude des nourriceries de la Baie de Seine orientale et de l'estuaire de la Seine ArchiMer
Morin, Jocelyne; Riou, Philippe; Bessineton, Christophe; Vedieu, Christophe; Lemoine, Michel; Simon, Serge; Le Pape, Olivier.
This study, carried out from 1995 to 1997, within the framework of "Le Havre" harbour extension project, concerned halieutic populations and the characterization of a coastal nursery in the oriental part of the Seine bay and the Seine estuary . The main objective was to describe the specific and demographic composition of marine populations and their spatio-temporal distribution, and so assess the biological and halieutic role of this area. This study also included a research about the dietary needs of fish juveniles living in the estuary. Autumn and winter surveys results show that the estuary and area under direct influence are the richest from a biological and halieutic point of view. The mouth estuary isthe richest area in terms of diversity of...
Tipo: Text Palavras-chave: Bay of Seine; Estuary; Food; Trophic; Juvenile; Nursery; Baie de Seine; Estuaire; Alimentation; Trophique; Juvénile; Nourricerie.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-1507.pdf
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Etude des nourriceries de la baie de Seine orientale et de l'estuaire de la Seine. Synthese des connaissances. Identification d'une nourricerie en estuaire de Seine. Analyse de la fonctionnalite de l'estuaire comme nourricerie ArchiMer
Morin, Jocelyne; Riou, Philippe; Lemoine, Michel; Le Pape, Olivier; Bessineton, Christophe; Vedieu, Christophe; Simon, Serge.
The study carried out from 1995 to 1997 within the framework of "Le Havre" harbour extension project, concerned the description of halieutic populations and the characterization of a coastal nursery in the oriental part of the Seine bay and in the Seine estuary. The main objective was to describe the specific and demographic composition of marine populations as well as their spatio-temporal distribution, and then to assess the biologic and halieutic role of this area. The study also included a research about the dietary needs of fish juveniles living in the estuary. Methodology Five series of surveys were carried out in subtidal and intertidal zones. They were realised in autumn and winter, from September 1995 to March 1997, in an area extending from the...
Tipo: Text Palavras-chave: Marine population; Halieutic; Biology; Estuary; Seine bay; Nursery.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-1576.pdf
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Flatfish ecology: Advances from the 10th international flatfish symposium ArchiMer
Le Pape, Olivier; Brind'Amour, Anik; Begout, Marie-laure.
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00471/58297/60815.pdf
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From Data to End-to-End Models: 15 Years of Research to Describe the Dynamics of Exploited Marine Ecosystems in the Eastern Channel ArchiMer
Marchal, Paul; Gasche, Loic; Girardin, Raphael; Le Pape, Olivier; Huret, Martin; Mahevas, Stephanie; Travers-trolet, Morgane; Vaz, Sandrine.
Considerable research has been conducted in the past 15 years around the Eastern English Channel ecosystem. Data collected since the 1970s on the biotic and abiotic compartments have been collated and mapped out in the mid-2000. This spatially explicit information formed a sound basis to improve knowledge on, and model, the functioning and dynamics of key ecosystem compartments, with a focus on flatfish species and fisheries and their interactions with other sectors of activity (aggregate extractions, maritime traffic). The more recent ongoing works are dedicated to the integration of those processes into several complementary end-to-end ecosystem models.
Tipo: Text Palavras-chave: Eastern English Channel; Flatfish; Spatial analyses; Ecosystem modelling.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00293/40420/38946.pdf
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Global marine primary production constrains fisheries catches ArchiMer
Chassot, Emmanuel; Bonhommeau, Sylvain; Dulvy, Nicholas K.; Melin, Frederic; Watson, Reg; Gascuel, Didier; Le Pape, Olivier.
Primary production must constrain the amount of fish and invertebrates available to expanding fisheries; however the degree of limitation has only been demonstrated at regional scales to date. Here we show that phytoplanktonic primary production, estimated from an ocean-colour satellite (SeaWiFS), is related to global fisheries catches at the scale of Large Marine Ecosystems, while accounting for temperature and ecological factors such as ecosystem size and type, species richness, animal body size, and the degree and nature of fisheries exploitation. Indeed we show that global fisheries catches since 1950 have been increasingly constrained by the amount of primary production. The primary production appropriated by current global fisheries is 17-112% higher...
Tipo: Text Palavras-chave: Bottom-up; Large Marine Ecosystem; Quantile regression; Sustainable fishing.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11294/7836.pdf
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Growth and condition of juvenile sole (Solea solea L.) as indicators of habitat quality in coastal and estuarine nurseries in the Bay of Biscay with a focus on sites exposed to the Erika oil spill ArchiMer
Gilliers, Camille; Le Pape, Olivier; Desaunay, Yves; Bergeron, Jean-pierre; Schreiber, Nathalie; Guerault, Daniel; Amara, Rachid.
Indicators of growth and condition were used to compare the habitat quality of nurseries of juvenile sole (Solea solea L.) in the Bay of Biscay, based on one survey in 2000. The four biological indicators are poorly correlated with each other, suggesting that no single measure may give an adequate description of fish health and of its habitat's quality. Growth indicators showed significant differences between northern and southern areas. Juveniles from the two southernmost nurseries, the Gironde estuary and the Pertuis Antioche, displayed significant lower otolith increment widths and mean sizes. These differences were inversely related to water temperature and unrelated to genetic or age differences, and are unlikely to be due to limiting trophic...
Tipo: Text Palavras-chave: Erika oil spill; RNA/DNA; Otolith daily increment width; Essential fish habitat.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3963.pdf
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Growth, feeding and distribution of the solenette Buglossidium luteum with particular reference to its habitat preference ArchiMer
Amara, Rachid; Mahe, K; Le Pape, Olivier; Desroy, N.
Growth, condition, diet and spatial distribution of the solenette Buglossidium luteum (Risso, 1810) were investigated along the coasts of the French Atlantic, eastern English Channel and Southern Bight of the North Sea. Distribution and habitat preferences of solenette were analysed in relation to physical and biological features presumed to influence fish distribution. B. luteum was patchily distributed and concentrated in shallow muddy and muddy-sand bottoms moderately influenced by estuarine waters (euhaline waters). In the studied area, solenette seemed to find habitats suitable for growth. Food availability was not assumed to be a limiting factor for solenette distribution in contrast to abiotic factors such as salinity.
Tipo: Text Palavras-chave: Solenette; Habitat suitability; Distribution; Feeding; Growth.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-777.pdf
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Habitat suitability for juvenile common sole (Solea solea, L.) in the Bay of Biscay (France): A quantitative description using indicators based on epibenthic fauna ArchiMer
Le Pape, Olivier; Baulier, Loic; Cloarec, Aurélie; Martin, Jocelyne; Le Loch, Francois; Desaunay, Yves.
This study describes the spatial distribution of young-of-the-year common sole based on beam trawl surveys conducted in late summer in the coastal and estuarine parts of the Bay of Biscay (France). Previous studies showed that habitat suitability for juvenile common sole varies according to physical factors and notably bathymetry and sediment structure. Nevertheless, the use of these descriptors alone to model habitat suitability led to considerable unexplained variability in juvenile common sole distribution. Hence, the epibenthic macro- and megafauna collected during beam trawl surveys was taken into account to improve models of habitat suitability for these juvenile flatfish. Ecotrophic guilds based on life traits (behaviour, mobility and feeding) were...
Tipo: Text Palavras-chave: Bay of Biscay; Ecotrophic guilds; Epibenthic fauna; Habitat suitability models; Nursery ground; Solea solea.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2402.pdf
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How fast can the European eel (Anguilla anguilla) larvae cross the Atlantic Ocean? ArchiMer
Bonhommeau, Sylvain; Blanke, Bruno; Treguier, Anne-marie; Grima, Nicolas; Rivot, Etienne; Vermard, Youen; Greiner, Eric; Le Pape, Olivier.
The migration duration of European eel (Anguilla anguilla) larvae (leptocephali) from the spawning areas in the Sargasso Sea to the European continental shelf remains highly controversial, with estimates varying from 6 months to more than 2 yr. We estimated the fastest migration period and the shortest distance travelled by eel larvae by simulating Lagrangian particles released in the Sargasso Sea and by simulating a range of larval behaviours (fixed-depth drift, vertical diurnal migration and active-depth selection to maximize current velocity). This enabled us to compute (i) a passive drift speed, and (ii) a hypothetic swimming speed needed for European eel larvae to cross the Atlantic in 6 months (i.e., the migration duration estimated from otolith...
Tipo: Text Palavras-chave: Sargasso Sea; Migration duration; Leptocephali; Lagrangian modelling; Gulf Stream; Fractals; Anguilla.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6865.pdf
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