Ontogenetic feeding shifts in two thresher shark species in the Galapagos Marine Reserve DOI Creative Commons
Camila Arnés-Urgellés, Felipe Galván‐Magaña, Fernando R. Elorriaga‐Verplancken

et al.

PeerJ, Journal Year: 2024, Volume and Issue: 12, P. e18681 - e18681

Published: Dec. 16, 2024

Background The morphology and hunting behavior of thresher sharks make them easily distinguishable. These species are distributed across the Tropical Pacific Ocean feeding on squid small fish. However, ontogenetic changes in their strategies habitat use still unknown this region. Methods We examined δ 13 C 15 N signatures vertebral collagen from populations Alopias pelagicus superciliosus inhabiting Galapagos Marine Reserve, focusing three maturity stages: neonate, juvenile adult. vertebrae samples were taken seizure illegal fishing activities carried out by a foreign fleet within archipelago. A total thirty-three A. twenty-one analyzed. Results Both displayed significant differences values ( p < 0.001), but not = 0.230), suggesting similar use, different prey consumption. Throughout ontogeny, isotopic where neonates showed lower higher compared to juveniles, probably because they reflect mothers even after first year life. This study highlights trophic between both species, accompanied an variation , aspects that allow us understand role these dynamics Eastern ecosystem.

Language: Английский

Ontogenetic feeding shifts in two thresher shark species in the Galapagos Marine Reserve DOI Creative Commons
Camila Arnés-Urgellés, Felipe Galván‐Magaña, Fernando R. Elorriaga‐Verplancken

et al.

PeerJ, Journal Year: 2024, Volume and Issue: 12, P. e18681 - e18681

Published: Dec. 16, 2024

Background The morphology and hunting behavior of thresher sharks make them easily distinguishable. These species are distributed across the Tropical Pacific Ocean feeding on squid small fish. However, ontogenetic changes in their strategies habitat use still unknown this region. Methods We examined δ 13 C 15 N signatures vertebral collagen from populations Alopias pelagicus superciliosus inhabiting Galapagos Marine Reserve, focusing three maturity stages: neonate, juvenile adult. vertebrae samples were taken seizure illegal fishing activities carried out by a foreign fleet within archipelago. A total thirty-three A. twenty-one analyzed. Results Both displayed significant differences values ( p < 0.001), but not = 0.230), suggesting similar use, different prey consumption. Throughout ontogeny, isotopic where neonates showed lower higher compared to juveniles, probably because they reflect mothers even after first year life. This study highlights trophic between both species, accompanied an variation , aspects that allow us understand role these dynamics Eastern ecosystem.

Language: Английский

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