Structure and seasonal variability in fish food webs in a small macrotidal estuary (Canche estuary, Eastern English Channel) based on stable carbon and nitrogen isotope analysis

Type Article
Date 2021-05
Language English
Author(s) Bouaziz Rym1, 2, Le Loch Francois3, Rolet CélineORCID4, Veillet Guillaume1, 4, Munaron Jean-Marie3, Rabhi Khalef1, Borhane Djebar Abdellah2, Amara Rachid1, Ben Rais Lasram FridaORCID1
Affiliation(s) 1 : Univ. Littoral Côte d’Opale, Univ. Lille, CNRS, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, F-62930 Wimereux, France
2 : Université Badji Mokhtar Annaba, B.P.12, Annaba, 23000, Algeria
3 : IRD, Univ Brest, CNRS, Ifremer, LEMAR, F-29280 Plouzane, France
4 : GEMEL Groupe d’Etude des Milieux Estuariens et Littoraux, 115 Quai Jeanne d’Arc, F-80230 Saint-Valery-sur-Somme, France
Source Regional Studies In Marine Science (2352-4855) (Elsevier BV), 2021-05 , Vol. 44 , P. 101694 (14p.)
DOI 10.1016/j.rsma.2021.101694
WOS© Times Cited 1
Keyword(s) Food web, Macrotidal estuary, Stable isotopes, Seasonal variations, Nursery
Abstract

Estuaries are highly important nursery habitats for a range of fish species because they provide refuge and food, especially for juveniles. However, the importance of specific salinity zones and adjacent shallow marine habitats (subtidal and surf zones) for fish feeding is not well understood, particularly in small macrotidal estuaries. Using the example of the Canche estuary, which is considered a reference for small macrotidal estuaries in France, we investigated the structure and seasonal variability in fish food webs based on stable carbon and nitrogen isotope analysis. Our results provide a new vision of the Canche estuary, which has been considered a major feeding ground for all marine fish that spend time there. Based on C results, our results revealed that organic matter of terrestrial origin has little influence on functioning of the Canche food web, except for flounders in the upstream area of the estuary. Conversely, microphytobenthos and marine particulate organic matter contribute most to the food web of fish in the estuary. Our study also revealed that some fish species visit the estuary for reasons other than feeding, such as to avoid predation or because they are carried by the tide. This work confirmed the suitability of using stable isotopes to trace fish fidelity to feeding grounds less than 10 km apart.

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Bouaziz Rym, Le Loch Francois, Rolet Céline, Veillet Guillaume, Munaron Jean-Marie, Rabhi Khalef, Borhane Djebar Abdellah, Amara Rachid, Ben Rais Lasram Frida (2021). Structure and seasonal variability in fish food webs in a small macrotidal estuary (Canche estuary, Eastern English Channel) based on stable carbon and nitrogen isotope analysis. Regional Studies In Marine Science, 44, 101694 (14p.). Publisher's official version : https://doi.org/10.1016/j.rsma.2021.101694 , Open Access version : https://archimer.ifremer.fr/doc/00682/79423/