Exploring diet shifts and ecology in modern sharks using calcium isotopes and trace metal records of their teeth.

Autor: Assemat A; ISEM, Université Montpellier CNRS EPHE IRD, Montpellier, France., Adnet S; ISEM, Université Montpellier CNRS EPHE IRD, Montpellier, France., Bayez K; University of Lyon, Lyon, France., Hassler A; Laboratoire de Géologie de Lyon: Terre, Planète, Environnement, Ecole Normale Supérieure de Lyon, Lyon, France., Arnaud-Godet F; Laboratoire de Géologie de Lyon: Terre, Planète, Environnement, Ecole Normale Supérieure de Lyon, Lyon, France., Mollen FH; Elasmobranch Research Belgium, Bonheiden, Belgium., Girard C; ISEM, Université Montpellier CNRS EPHE IRD, Montpellier, France., Martin JE; Laboratoire de Géologie de Lyon: Terre, Planète, Environnement, Ecole Normale Supérieure de Lyon, Lyon, France.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2024 Nov; Vol. 105 (5), pp. 1469-1481. Date of Electronic Publication: 2022 Sep 28.
DOI: 10.1111/jfb.15211
Abstrakt: Sharks occupy all living environments of the marine realm as well as some freshwater systems. They display varied and flexible feeding behaviours, but understanding their diet remains challenging due to their elusive ecology and the invasiveness of stomach content analyses in regard of their threatened status. As a potential alternative, we discuss the variability in δ 44/42 Ca values recorded in the tooth enamel of size-graded individuals belonging to three species of large sharks with distinct diets (Isurus oxyrinchus, Hexanchus griseus and Carcharodon carcharias). The preliminary results highlight shifts in diet linked to ontogeny (I. oxyrinchus and H. griseus) and spatial distribution (C. carcharias) characterizing feeding behaviour in these species at individual and population level. These outcomes agree with the results of traditional stomach analyses supporting that nontraditional stable isotopes thus represent new perspectives for the study of modern and extinct shark ecology. In addition, for the first time, the Sr/Ca elemental ratios measured in H. griseus reflect sexual differences that could be interpreted in terms of spatial segregation or physiological heterogeneities.
(© 2022 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles.)
Databáze: MEDLINE
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