Titre :

Feeding strategy of Downs herring larvae (Clupea harengus L.) in the English Channel and North Sea

Auteur(s) :

Denis, Jérémy [Auteur]
Laboratoire Ressources Halieutiques de Boulogne [LRHBL]
Vallet, Carole [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Courcot, Lucie [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Lefebvre, Valérie [Auteur]
Laboratoire Ressources Halieutiques de Boulogne [LRHBL]
Caboche, Josselin [Auteur]
Laboratoire Ressources Halieutiques de Boulogne [LRHBL]
Antajan, Elvire [Auteur]
Laboratoire Environnement Ressources de Boulogne-sur-Mer [LERBL]
Marchal, Paul [Auteur]
Laboratoire Ressources Halieutiques de Boulogne [LRHBL]
Loots, Christophe [Auteur]
Laboratoire Ressources Halieutiques de Boulogne [LRHBL]

Titre de la revue :

Journal of Sea Research (JSR)

Pagination :

33-46

Éditeur :

Elsevier

Date de publication :

2016-09

ISSN :

1385-1101

Mot(s)-clé(s) en anglais :

Diet Feeding strategy
Selectivity index
Scanning electronic microscopy
Downs herring larvae
Gut content

Discipline(s) HAL :

Sciences du Vivant [q-bio]
Sciences de l'environnement/Biodiversité et Ecologie

Résumé en anglais : [en]

This study aims to characterize the larval feeding strategy of the Downs sub-population of North Sea herring (Clupea harengus L.). Diet composition, vacuity rate and prey selectivity of larvae from 8 to 15 mm collected ...
Lire la suite >This study aims to characterize the larval feeding strategy of the Downs sub-population of North Sea herring (Clupea harengus L.). Diet composition, vacuity rate and prey selectivity of larvae from 8 to 15 mm collected during the International Bottom Trawl Survey (IBTS) - MIK sampling from 2008 to 2013 were assessed by direct observation of their gut contents using Scanning Electron Microscopy (SEM). The high contribution of protists and small zooplanktonic prey observed in the gut contents proved the relevance of SEM to study the diet of first feeding larvae. The relatively low vacuity rate of 45% suggests that food may not be a limiting factor for Downs herring larvae in winter. These larvae appeared to be omnivorous and there was a clear shift in term of prey composition at a size of 13 mm. Smaller larvae (8–12 mm) fed on a higher diversity of small prey, mainly small copepods (Oncaea spp. and Euterpina acutifrons), invertebrate eggs, diatoms (Psammodicthyon panduriforme and Coscinodiscus spp.) and dinoflagellates (Dinophysis acuminate and Prorocentrum micans) whereas bigger larvae (13–15 mm) fed on a lower diversity of larger prey, mainly copepods (Temora longicornis and Paracalanus parvus)anddinoflagellates (Gonyaulax spp.). Downs herring larvae had clear prey preferences as some dinoflagellates (Pyrophacus spp., Gonyaulax spp., P. micans and Porocentrum lima), invertebrate eggs, copepods (Oncaea spp.andnauplii)anddiatoms(Thalassiosira curviseriata)werepositivelyselectedand other diatoms (Nitzschia spp., Thalassiosira tenera, Thalassiosira spp. and Chaetoceros spp.) and copepods (Pseudocalanus elongatus, T. longicornis and Unidentified calanoid) were negatively selected. We argue that this shift in term of prey preferences occurring at a size of 13 mm constitutes the critical period for Downs herring larvae.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL