Inter-individual differences in ontogenetic trophic shifts among three marine predators

Oecologia
Philip MatichJohann Mourier

Abstract

Ontogenetic niche shifts are widespread. However, individual differences in size at birth, morphology, sex, and personalities can cause variability in behavior. As such, inherent inter-individual differences within populations may lead to context-dependent changes in behavior with animal body size, which is of concern for understanding population dynamics and optimizing ecological monitoring. Using stable carbon and nitrogen isotope values from concurrently sampled tissues, we quantified the direction and magnitude of intraspecific variation in trophic shifts among three shark species, and how these changed with body size: spurdogs (Squalus spp.) in deep-sea habitats off La Réunion, bull sharks (Carcharhinus leucas) in estuarine habitats of the Florida Everglades, and blacktip reef sharks (Carcharhinus melanopterus) in coral reef ecosystems of Moorea, French Polynesia. Intraspecific variation in trophic shifts was limited among spurdogs, and decreased with body size, while bull sharks exhibited greater individual differences in trophic shifts, but also decreased in variability through ontogeny. In contrast, blacktip reef sharks exhibited increased intraspecific variation in trophic interactions with body size. Variability in tr...Continue Reading

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Citations

Oct 18, 2019·Journal of Fish Biology·Ornella C WeideliMichael R Heithaus
Oct 16, 2019·Journal of Fish Biology·V RaoultM F Gaston
Dec 21, 2019·Journal of Fish Biology·Clark MorganJames Gelsleichter
Jun 13, 2020·Oecologia·Wimke FokkemaHan Olff
May 13, 2020·Oecologia·Oliver N Shipley, Philip Matich
May 18, 2021·The Journal of Animal Ecology·Oliver N ShipleyMichael G Frisk

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Methods Mentioned

BETA
biopsy

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