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Master Thesis

Investigating the trophic ecology of five species of Gadiformes in the Celtic Sea combining stable isotopes and gut contents

Abstract : Ecosystem-based fisheries management is technically possible through the development of models relying on food web structure and species interactions. In order to determine the trophic interactions between species, potential consideration of size classes and potential spatial consideration of such models, it is necessary to study feeding ecology. Using gut contents and stable isotopes, we studied the trophic ecology of five gadiformes species. We also analyzed ontogenetic shifts in trophic niche and the effect of the depth through two zones. Species are cod, haddock, whiting, hake and blue whiting and share biological traits. They are captured by mixed-fisheries in the Celtic Sea. Hence, this study showed segregation in the trophic niche of these species and local feeding strategies. Moreover, changes in diet occurred for hake and to a lesser extend whiting and haddock. Finally, it was difficult to conclude on a spatial difference but several clues tended to exhibit differences in available and consumed resources and food web structure. Combining both approaches was a real asset for this study as it enables us to have a more interesting, nuanced and diverse vision of the trophic interactions.
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https://dumas.ccsd.cnrs.fr/dumas-01634570
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Submitted on : Tuesday, November 14, 2017 - 11:52:15 AM
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Louise Day. Investigating the trophic ecology of five species of Gadiformes in the Celtic Sea combining stable isotopes and gut contents . Agronomy. 2017. ⟨dumas-01634570⟩

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