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Novel approach for testing the food limitation hypothesis in estuarine and coastal fish nurseries ArchiMer
Tableau, Adrien; Le Bris, H; Saulnier, E; Le Pape, Olivier; Brind'Amour, Anik.
Survival success of early life stages of fish is regulated by density-dependent effects, but the limiting factors explaining these effects have not been well identified. In coastal habitats, juveniles of many fish species occur in high concentrations and possibly compete for food resources. This study compared the ratio of food consumption to benthic prey production to test whether food availability is a major factor defining the carrying capacity of fish nurseries. We developed a method to quantify the exploitation efficiency (also called ecotrophic efficiency) of the juvenile fish feeding on benthic prey, expressed as a ratio of food consumption to food production. This method includes many sources of uncertainty and a key parameter of prey...
Tipo: Text Palavras-chave: Exploitation efficiency; Predator-prey relationship; Food consumption; Fish juvenile; Nursery habitat; Bioenergetics; Density dependence; Carrying capacity; Secondary production.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00588/70009/67925.pdf
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Food limitation of juvenile marine fish in a coastal and estuarine nursery ArchiMer
Saulnier, E.; Le Bris, H.; Tableau, Adrien; Dauvin, J.c.; Brind'Amour, Anik.
Despite their importance for species conservation and sound management of exploited living resources, the density-dependent mechanisms that regulate wild populations are among the least understood process in ecology. In many marine fish species, there is strong evidence that regulation occurs at the juvenile stage, when individuals concentrate in spatially restricted nurseries. However, little is known about the underlying mechanisms. Whether competition for food resources determines fish growth and survival is particularly controversial. We investigated whether food supply may have limited juvenile fish production (integrating both growth and survival) in a coastal and estuarine nursery in western Europe. Using a recent bioenergetics-based approach, we...
Tipo: Text Palavras-chave: Food limitation; Nursery; Juvenile fish; Predatory invertebrates; Macrofauna; English channel.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00611/72282/71080.pdf
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Seasonality in coastal macrobenthic biomass and its implications for estimating secondary production using empirical models ArchiMer
Saulnie, Erwan; Brind'Amour, Anik; Tableau, Adrien; Rufino, Marta; Dauvin, Jean‐claude; Luczak, Christophe; Le Bris, Hervé.
Macrobenthic secondary production is widely used to assess the trophic capacity, health, and functioning of marine and freshwater ecosystems. Annual production estimates are often calculated using empirical models and based on data collected during a single period of the year. Yet, many ecosystems show seasonal variations. Although ignoring seasonality may lead to biased and inaccurate estimates of annual secondary production, it has never been tested at the community level. Using time series of macrobenthic data collected seasonally at three temperate marine coastal soft‐bottom sites, we assessed seasonal variations in biomass of macrobenthic invertebrates at both population and community levels. We then investigated how these seasonal variations affect...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60091/63433.pdf
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Influence of food availability on the spatial distribution of juvenile fish within soft sediment nursery habitats ArchiMer
Tableau, Adrien; Brind'Amour, Anik; Woillez, Mathieu; Le Bris, H..
Soft sediments in coastal shallow waters constitute nursery habitats for juveniles of several flatfishes. The quality of a nursery is defined by its capacity to optimize the growth and the survival of juvenile fish. The influence of biotic factors, such as food availability, is poorly studied at the scale of a nursery ground. Whether food availability limits juvenile survival is still uncertain. A spatial approach is used to understand the influence of food availability on the distribution of juvenile fish of various benthic and demersal species in the Bay of Vilaine (France), a productive nursery ground. We quantified the spatial overlap between benthic macro-invertebrates and their predators (juvenile fish) to assess if the latter were spatially covering...
Tipo: Text Palavras-chave: Predator-prey relationship; Nursery habitat; Flatfish; Demersal fish; Benthic invertebrates; Spatial overlap; Food limitation.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00300/41100/40273.pdf
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A fish-based index of estuarine ecological quality incorporating information from both scientific fish survey and experts knowledge ArchiMer
Tableau, Adrien; Drouineau, Hilaire; Delpech, C.; Pierre, M.; Lobry, J.; Le Pape, O.; Breine, J.; Lepage, Mario.
In the Water Framework Directive (European Union) context, a multimetric fish based index is required to assess the ecological status of French estuarine water bodies. A first indicator called ELFI was developed, however similarly to most indicators, the method to combine the core metrics was rather subjective and this indicator does not provide uncertainty assessment. Recently, a Bayesian method to build indicators was developed and appeared relevant to select metrics sensitive to global anthropogenic pressure, to combine them objectively in an index and to provide a measure of uncertainty around the diagnostic. Moreover, the Bayesian framework is especially well adapted to integrate knowledge and information not included in surveys data. In this context,...
Tipo: Text Palavras-chave: Anthropogenic pressure; Bayesian method; Expert judgement; Multimetric fish-based indicator; Prior information; Water Framework Directive.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00146/25700/24029.pdf
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Available Benthic Energy Coefficient (ABEC): a generic tool to estimate the food profitability in coastal fish nurseries ArchiMer
Tableau, Adrien; Le Bris, H.; Brind'Amour, Anik.
The benthic production of prey seems to be one of the main drivers among many environmental factors that influence the quality of fish nurseries and potentially limit their carrying capacity. However, the contribution of food availability in the growth and survival of juveniles is still controversial. The Available Benthic Energy Coefficient (ABEC) aims to assess the trophic profitability of benthic invertebrate prey; this concept reflects the combination of energy richness and availability of prey. A value of the coefficient was associated with each prey species. This value was calculated from the product of 4 components: (1) mass energy, (2) productivity, (3) regeneration, and (4) accessibility. Thus, this coefficient is expressed as a quantity of energy...
Tipo: Text Palavras-chave: Predator-prey relationship; Secondary production; Prey availability; Demersal fish; Nursery habitat; Carrying capacity; Bioenergetics.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00260/37079/35588.pdf
Registros recuperados: 6
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