TY - JOUR
T1 - Ontogenetic feeding ecology of the scalloped hammerhead shark Sphyrna lewini in the Colombian Eastern Tropical Pacific
AU - Estupiñán-Montaño, Colombo
AU - Galván-Magaña, Felipe
AU - Elorriaga-Verplancken, Fernando
AU - Zetina-Rejón, Manuel J.
AU - Sánchez-González, Alberto
AU - Polo-Silva, Carlos J.
AU - Villalobos-Ramírez, Daniel J.
AU - Rojas-Cundumí, Jaiver
AU - Delgado-Huertas, Antonio
N1 - Publisher Copyright:
© Inter-Research 2021.
PY - 2021
Y1 - 2021
N2 - Changes in feeding habits during ontogeny show that organisms can present shifts in foraging behavior during their life cycle, which can alter local trophic dynamics. Therefore, describing diet across species ontogeny clarifies the ecological niche and ecosystem role of marine predators. In this study, diet tracers (stable isotope analysis) were analyzed in 16 scalloped hammerhead sharks Sphyrna lewini, using δ13C and δ15N values of collagen in vertebral cross-sections to reconstruct diet across their ontogeny. Our results suggest that S. lewini occupies a broad isotopic niche due to the consumption of prey belonging to different trophic levels (δ15N: 7.6−13.0 %) of the food chain in both coastal and oceanic zones (δ13C: −17.2 to −14.1 %) during their lifetime. Accordingly, ontogenetic changes in diet and habitat use were suggested by differences in δ13C and δ15N across age groups, indicating high consumption of coastal prey at 0−2 yr, oceanic prey at ~2−4 yr, a shift to high coastal prey at > 4 yr, and a shift to high coastal prey, along with the consumption of prey from multiple trophic levels through feeding ontogeny (estimated trophic position: 2.9−6.5). This study showed migration from coastal to oceanic zones in juvenile S. lewini, and their return to coastal habitats as adults, potentially related to the use of coastal zones (i.e. mangroves) in the Eastern Tropical Pacific, both as important feeding areas for neonates and as feeding and breeding grounds for adults.
AB - Changes in feeding habits during ontogeny show that organisms can present shifts in foraging behavior during their life cycle, which can alter local trophic dynamics. Therefore, describing diet across species ontogeny clarifies the ecological niche and ecosystem role of marine predators. In this study, diet tracers (stable isotope analysis) were analyzed in 16 scalloped hammerhead sharks Sphyrna lewini, using δ13C and δ15N values of collagen in vertebral cross-sections to reconstruct diet across their ontogeny. Our results suggest that S. lewini occupies a broad isotopic niche due to the consumption of prey belonging to different trophic levels (δ15N: 7.6−13.0 %) of the food chain in both coastal and oceanic zones (δ13C: −17.2 to −14.1 %) during their lifetime. Accordingly, ontogenetic changes in diet and habitat use were suggested by differences in δ13C and δ15N across age groups, indicating high consumption of coastal prey at 0−2 yr, oceanic prey at ~2−4 yr, a shift to high coastal prey at > 4 yr, and a shift to high coastal prey, along with the consumption of prey from multiple trophic levels through feeding ontogeny (estimated trophic position: 2.9−6.5). This study showed migration from coastal to oceanic zones in juvenile S. lewini, and their return to coastal habitats as adults, potentially related to the use of coastal zones (i.e. mangroves) in the Eastern Tropical Pacific, both as important feeding areas for neonates and as feeding and breeding grounds for adults.
KW - Maternal transfer
KW - Maturity stages
KW - Ontogeny
KW - Southeast Pacific
KW - Stable isotopes
KW - Vertebrae
UR - http://www.scopus.com/inward/record.url?scp=85112547864&partnerID=8YFLogxK
U2 - 10.3354/meps13639
DO - 10.3354/meps13639
M3 - Artículo
AN - SCOPUS:85112547864
SN - 0171-8630
VL - 663
SP - 127
EP - 143
JO - Marine Ecology Progress Series
JF - Marine Ecology Progress Series
ER -