A preliminary investigation of the fish food web in the Gironde estuary, France, using dietary and stable isotope analyses

Pasquaud, Stéphanie; Élie, Pierre; Jeantet, C.; Billy, Isabelle; Martinez, Philippe; Girardin, Michel

doi:10.1016/j.ecss.2007.12.014

Cited by 101 publications

(73 citation statements)

References 70 publications

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“…estuarine juveniles (5-30 cm; Pasquaud et al, 2008). Therefore, despite a low number of individuals analysed, SIA confirms that the most important dietary changes occur between the juvenile and adult stages in meagre (i.e.…”

Section: Ontogenic Changesmentioning

confidence: 58%

“…In the Gironde and Tagus estuaries, Crangon crangon and Mysidacea were identified as the most important items for small juvenile meagre. Crustaceans represented more than 85% of the diet in these studies (Cabral and Ohmert, 2001;Pasquaud et al, 2008). However, Cabral and Ohmert (2001) showed that the relative proportion of fish in the diet increased with the size of juveniles, whereas Quéro and Vayne (1985) suggested that the diet of large individuals (>27 cm) included fish species such as clupeiforms, mullets or scads.…”

Section: Ontogenic Changesmentioning

confidence: 95%

“…Cannibalism accounted for a non-negligible part of the diet (>5% of ingested biomass). Regarding isotopic signatures, meagre exhibited values from 14.3‰ to 16.8‰ for d 15 N and from À18.7‰ to À15.8‰ for d 13 C (corresponding to preservation-corrected values ranging from 13.7‰ to 16.4‰ for d 15 N and from À19.1‰ to À15.7‰ for d 13 C), which is characteristic of organisms from marine environment rather than fluvial-estuarine environment in the Bay of Biscay (Chouvelon et al, 2012;Pasquaud et al, 2008). Prey type preferences as revealed by stomach content analysis were supported by mean dietary contribution values proposed by isotopic mixing modelling, despite a low number of individuals considered for SIA.…”

Section: Generalmentioning

confidence: 99%

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Trophic ecology of commercial-size meagre, Argyrosomus regius, in the Bay of Biscay (NE Atlantic)★

Hubans

Chouvelon

Bégout

et al. 2017

Aquat. Living Resour.

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-In the north-eastern Atlantic, meagre (Argyrosomus regius) is one of the largest fish living on the shelf and this species has important commercial interest. Over the past two decades, large variations in meagre abundance have been observed with pluri-annual cycles but the factors involved in such variations are still unclear. Trophic interactions between meagre and other species (both prey and competitors) might be one explanatory variable of the observed variations in meagre recruitment and abundance. In the present study, we described the diet of commercial-size meagre in the Bay of Biscay from stomach content and stable isotope analyses, and explored its dietary ontogeny. We found that commercial-size meagres were mostly piscivorous with a diet dominated by clupeiform fish (mainly anchovy and sardine) completed by demersal fish (mainly pout and whiting). Cannibalism also accounted for a non-negligible part of the diet. Interestingly, stable isotope and stomach content analyses showed only a very slight increase in prey length and trophic level during the ontogeny of large meagre after 50 cm of total length and despite a 3 fold-change of the individual length in our sampling. Our results suggested that specific trophic interactions (i.e. bottomup control by clupeiform fish on meagre population, competitive effects on piscivorous populations or topdown control by meagre on clupeiform fish populations) may occur in the Bay of Biscay and can impact meagre abundance dynamics. Our study underlined the interest to enhance ecological knowledge of preypredator relationships in the development of ecosystem-based approach to understand trophic controls impacting aquatic living resources and fishery economy.

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Section: Ontogenic Changesmentioning

confidence: 58%

Section: Ontogenic Changesmentioning

confidence: 95%

Section: Generalmentioning

confidence: 99%

See 1 more Smart Citation

Trophic ecology of commercial-size meagre, Argyrosomus regius, in the Bay of Biscay (NE Atlantic)★

Hubans

Chouvelon

Bégout

et al. 2017

Aquat. Living Resour.

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“…The role of these ecosystems in terms of retention of particulate organic matter and nutrients as well as suitable habitat for migratory and native flora and fauna is widely recognized (Blanco, 2003). These habitats provide shelter and food resources to the fishes, hence influencing on fish assemblage (França et al, 2009;Nicolas et al, 2010), also playing a crucial role in maintaining biodiversity in aquatic systems, particularly for fish (Pasquaud et al, 2008). In Solís Chico subestuary, Stebniki (2014) found mainly zooplankton, phytoplankton and zoobenthos in the diet of fish, recording seasonal variability in food intake.…”

Section: Seasonal Variation Of Fish Assemblage and Environmental Factorsmentioning

confidence: 99%

Seasonal composition, abundance and biomass of the subestuarine fish assemblage in Solís Chico (Río de la Plata estuary, Uruguay)

et al. 2016

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The large estuaries can present long narrow branches called subestuaries or tidal creeks. These types of subsystems are distributed along the Uruguayan coast of the Río de la Plata estuary and are very important as nursery and refuge areas for fish. For the first time, the seasonal composition and abundance of the fish community of the Solís Chico subestuary was studied by using beach and gill nets. Fourteen species, mainly euryhaline (86%) presented a significant representation of juvenile stages. The fish community was dominated by Odontesthes argentinensis, Platanichthys platana, Mugil liza, Brevoortia aurea, Micropogonias furnieri and Paralichthys orbignyanus, similar to adjacent subestuaries. While Micropogonias furnieri and B. aurea were the most abundant species, some other species were rarely caught. A seasonal variation of the fish assemblage abundance was detected, with higher values in autumn showing a positive correlation with temperature. Species that complete their life cycle in the Río de la Plata estuary, some of which are relevant to fisheries (64% of the analyzed species) were captured in the Solís Chico subestuary. The importance of this environment as a transitional system for some estuarine fish species is advised.Keywords: estuary, fish community, ecological status, ichthyofauna, temporal variability.Composição, abundância e biomasa sazonal da assembleia de peixes no subestuário do Solís Chico (Estuário do Río de la Plata, Uruguay) ResumoOs grandes estuários podem apresentar longos ramos estreitos chamados subestuários e riachos de maré. Estes subsistemas estão distribuídos ao longo da costa uruguaia no estuário do Río de la Plata e são muito importantes como áreas de reprodução e refúgio para os peixes. Pela primeira vez, a composição sazonal e abundância da comunidade de peixes do subestuário Solís Chico foi estudada usando redes de arrasto de praia e rede de emalhar. Quatorze espécies com predominância das eurialinas foram capturadas, havendo uma representação significativa das fases juvenis e espécies alvo para a pesca. A comunidade de peixes foi dominada por Odontesthes argentinensis, Platanichthys platana, Mugil liza, Brevoortia aurea, Micropogonias furnieri e Paralichthys orbignyanus, semelhante aos subestuários adjacentes. Enquanto, M. furnieri e B. aurea foram as espécies com maior número de individuos. Solís Chico apresentou espécies exclusivas com baixa abundância e ocorrência. Foi verificada uma variação sazonal da abundância de peixes, com valores maiores no outono, mostrando uma correlação positiva com a temperatura. Algumas espécies relevantes para a pesca que completam seu ciclo de vida no estuário do Río de la Plata foram capturadas (64% das espécies estudadas) no subestuário Solís Chico, indicando a importância deste ambiente como um sistema transitório para algumas espécies estuarinas de peixes.Palavras-chave: estuários, comunidade de peixes, estado ecológico, ictiofauna, variabilidade temporal.

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“…It is fished commercially in the Gironde estuary in large quantities using traditional methods and every year, for over a century, between 27 and 82 tonnes have been fished and consumed Holthuis, 1980). Shrimps are also an important link in the food web in this estuary, since they are prey for many species of exploited fish, like the bass or the meagre (Pasquaud, 2006;Pasquaud et al, 2008). P.…”

Section: Introductionmentioning

confidence: 99%

Exoskeletal deformities in Palaemonidae: Are they a threat to survival?

Béguer

Feuillassier

Élie

et al. 2010

Marine Environmental Research

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A preliminary investigation of the fish food web in the Gironde estuary, France, using dietary and stable isotope analyses

Cited by 101 publications

References 70 publications

Trophic ecology of commercial-size meagre, Argyrosomus regius, in the Bay of Biscay (NE Atlantic)★

Trophic ecology of commercial-size meagre, Argyrosomus regius, in the Bay of Biscay (NE Atlantic)★

Seasonal composition, abundance and biomass of the subestuarine fish assemblage in Solís Chico (Río de la Plata estuary, Uruguay)

Exoskeletal deformities in Palaemonidae: Are they a threat to survival?

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