Ontogenetic shift or not? Different foraging trade-offs within the meso- to bathypelagic fish community.

Autor: Loutrage L; Observatoire Pelagis UAR 3462 La Rochelle Université/CNRS La Rochelle France.; DECOD (Ecosystem Dynamics and Sustainability: From Source to Sea), Ifremer, Institut Agro, INRAE Nantes France.; Centre d'Etudes Biologiques de Chizé (CEBC) UMR 7372 La Rochelle Université/CNRS Villiers-en-Bois France., Brind'Amour A; DECOD (Ecosystem Dynamics and Sustainability: From Source to Sea), Ifremer, Institut Agro, INRAE Nantes France., Chouvelon T; Observatoire Pelagis UAR 3462 La Rochelle Université/CNRS La Rochelle France.; Ifremer CCEM Contamination Chimique des Écosystèmes Marins Nantes France., Spitz J; Observatoire Pelagis UAR 3462 La Rochelle Université/CNRS La Rochelle France.; Centre d'Etudes Biologiques de Chizé (CEBC) UMR 7372 La Rochelle Université/CNRS Villiers-en-Bois France.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2024 Mar 20; Vol. 14 (3), pp. e11129. Date of Electronic Publication: 2024 Mar 20 (Print Publication: 2024).
DOI: 10.1002/ece3.11129
Abstrakt: During ontogeny, the increase in body size forces species to make trade-offs between their food requirements, the conditions necessary for growth and reproduction as well as the avoidance of predators. Ontogenetic changes are leading species to seek out habitats and food resources that meet their needs. To this end, ontogenetic changes in nocturnal habitat (vertical use of the water column) and in the type of food resources (based on stable isotopes of nitrogen) were investigated in 12 species of deep pelagic fish from the Bay of Biscay in the Northeast Atlantic. Our results revealed the existence of major differences in the ontogenetic strategies employed by deep pelagic fishes. Some species showed ontogenetic changes in both vertical habitat use and food resources (e.g. Jewel lanternfish ( Lampanyctus crocodilus ) and Atlantic soft pout ( Melanostigma atlanticum )). In contrast, other species showed no ontogenetic change (e.g. Koefoed's searsid ( Searsia koefoedi ) and Lancet fish ( Notoscopelus kroyeri )). Some species only changed food resources (e.g. Spotted lanternfish ( Myctophum punctatum ), Spotted barracudina ( Arctozenus risso ) and Stout sawpalate ( Serrivomer beanii )), while others seemed to be influenced more by depth than by trophic features (e.g. Bluntsnout smooth-head ( Xenodermichthys copei ) and Olfer's Hatchetfish ( Argyropelecus olfersii )). These results suggest that to meet their increasing energy requirements during ontogeny, some species have adopted a strategy of shifting their food resources (larger prey or prey with a higher trophic level), while others seemed to maintain their food resources but are most likely increasing the quantity of prey ingested. As fish species can have different functional roles during their development within ecosystems, characterising ontogenetic changes in mesopelagic fish species is a crucial step to be considered in future research aimed at understanding and modelling the complexity of deep-pelagic food webs.
Competing Interests: The authors declare no conflicts of interest.
(© 2024 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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