Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems

Cresson, Pierre; Chouvelon, Tiphaine; Bustamante, Paco; Bănaru, Daniela; Baudrier, Jérôme; Loc’h, François Le; Mauffret, A.; Benoit, Mialet; Spitz, Jérôme; Wessel, Nathalie; Briand, Marine J.; Denamiel, Margaux; Doray, Mathieu; Guillou, Gaël; Jadaud, Angélique; Lazard, Coline; Prieur, Solène; Rouquette, Manuel; Saraux, Claire; Serre, Sandrine; Timmerman, Charles-André; Vérin, Yves; Harmelin-Vivien, Mireille

doi:10.1016/j.pocean.2020.102343

Cited by 37 publications

(30 citation statements)

References 105 publications

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“…The large abundance of Clupeidae in large whiting stomachs reflects that the winter spawning migration of these species in the EEC represents an important trophic opportunity for whiting during a nutrient-poor period. Previous studies reported a particularly high energetic value for these species [ 63 , 76 ]. Energy content analyzes performed on 78 species taken from the northeast Atlantic Ocean thus revealed that C .…”

Section: Discussionmentioning

confidence: 99%

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea

et al. 2020

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An accurate description of trophic interactions is crucial to understand ecosystem functioning and sustainably manage marine ecosystems exploitation. Carbon and nitrogen stable isotopes were coupled with stomach content analyses to investigate whiting (Merlangius merlangus, Linnaeus, 1758) feeding behavior in the Eastern English Channel and Southern North Sea. Whiting juveniles and adults were sampled in autumn and winter to investigate both ontogenetic and seasonal changes. In addition, queen scallops (Aequipecten opercularis) samples were collected along with fish to be used as isotopic benthic baseline. Results indicated an ontogenetic diet change from crustaceans to fish and cephalopods. In autumn, δ 15 N values generally increased with fish size while in winter, a decrease of δ 15 N values with fish size was observed, as a potential result of spatial variation in baseline δ 15 N values. In winter, a nutrient-poor period, an increase in feeding intensity was observed, especially on the copepod Temora longicornis. This study provides further insights into whiting trophic ecology in relation to ontogenetic and seasonal variations, and it confirms the importance of combining several trophic analysis methods to understand ecosystem functioning.

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Section: Discussionmentioning

confidence: 99%

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea

et al. 2020

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“…Compared with prior knowledge, EcoDiet revealed higher contributions of benthic and invertebrate compartments to the diet of most species, resulting in lower TLs for many predators and lower importance of the pelagic pathways in biomass flows. This suggests that the overall functioning of the Celtic Sea may be closer to that of the neighboring English Channel than that of the pelagic‐dominated Bay of Biscay (Cresson et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

EcoDiet: A hierarchical Bayesian model to combine stomach, biotracer, and literature data into diet matrix estimation

Hernvann

Gascuel

Kopp

et al. 2022

Ecological Applications

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Although quantifying trophic interactions is a critical path to understanding and forecasting ecosystem functioning, fitting trophic models to field data remains challenging. It requires flexible statistical tools to combine different sources of information from the literature and fieldwork samples. We present EcoDiet, a hierarchical Bayesian modeling framework to simultaneously estimate food‐web topology and diet composition of all consumers in the food web, by combining (1) a priori knowledge from the literature on both food‐web topology and diet proportions; (2) stomach content analyses, with frequencies of prey occurrence used as the primary source of data to update the prior knowledge on the topological food‐web structure; (3) and biotracers data through a mixing model (MM). Inferences are derived in a Bayesian probabilistic rationale that provides a formal way to incorporate prior information and quantifies uncertainty around both the topological structure of the food web and the dietary proportions. EcoDiet was implemented as an open‐source R package, providing a user‐friendly interface to execute the model, as well as examples and guidelines to familiarize with its use. We used simulated data to demonstrate the benefits of EcoDiet and how the framework can improve inferences on diet matrix by comparison with classical network MM. We applied EcoDiet to the Celtic Sea ecosystem, and showed how combining multiple data types within an integrated approach provides a more robust and holistic picture of the food‐web topology and diet matrices than the literature or classical MM approach alone. EcoDiet has the potential to become a reference method for building diet matrices as a preliminary step of ecosystem modeling and to improve our understanding of prey–predator interactions.

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“…Moreover, the flows of detritus biomass are not considered in this study. In open ocean, the bulk of the transfer of energy occurs between phytoplankton and zooplankton, but in continental shelf ecosystems, NPP also fuels benthic pathway through downward coupling (Cresson et al, 2020; Duffill Telsnig et al, 2018; Woodland & Secor, 2013). Hence, by considering only the pelagic energy transfer in plankton food web, we have likely underestimated the fraction of energy which fuels the food web.…”

Section: Discussionmentioning

confidence: 99%

Climate‐induced decrease in biomass flow in marine food webs may severely affect predators and ecosystem production

Pontavice

Gascuel

Reygondeau

et al. 2021

Global Change Biology

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Climate change impacts on marine life in the world ocean are expected to accelerate over the 21st century, affecting the structure and functioning of food webs. We analyzed a key aspect of this issue, focusing on the impact of changes in biomass flow within marine food webs and the resulting effects on ecosystem biomass and production. We used a modeling framework based on a parsimonious quasi‐physical representation of biomass flow through the food web, to explore the future of marine consumer biomass and production at the global scale over the 21st century. Biomass flow is determined by three climate‐related factors: primary production entering the food web, trophic transfer efficiency describing losses in biomass transfers from one trophic level (TL) to the next, and flow kinetic measuring the speed of biomass transfers within the food web. Using climate projections of three earth system models, we calculated biomass and production at each TL on a 1° latitude ×1° longitude grid of the global ocean under two greenhouse gas emission scenarios. We show that the alterations of the trophic functioning of marine ecosystems, mainly driven by faster and less efficient biomass transfers and decreasing primary production, would lead to a projected decline in total consumer biomass by 18.5% by 2090–2099 relative to 1986–2005 under the “no mitigation policy” scenario. The projected decrease in transfer efficiency is expected to amplify impacts at higher TLs, leading to a 21.3% decrease in abundance of predators and thus to a change in the overall trophic structure of marine ecosystems. Marine animal production is also projected to decline but to a lesser extent than biomass. Our study highlights that the temporal and spatial projected changes in biomass and production would imply direct repercussions on the future of world fisheries and beyond all services provided by Ocean.

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Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems

Cited by 37 publications

References 105 publications

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea

EcoDiet: A hierarchical Bayesian model to combine stomach, biotracer, and literature data into diet matrix estimation

Climate‐induced decrease in biomass flow in marine food webs may severely affect predators and ecosystem production

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