TY - JOUR
T1 - Trophic ecology and ontogenetic shift in the diet of the sicklefin smoothhound (Mustelus lunulatus) in the southeastern Pacific Ocean
AU - Méndez-Macías, José S.
AU - Velázquez-Chiquito, Vanessa M.
AU - Estupiñán-Montaño, Colombo
AU - Galván-Magaña, Felipe
N1 - Publisher Copyright:
© 2019, National Marine Fisheries Service. All rights reserved.
PY - 2019
Y1 - 2019
N2 - The feeding habits of thesicklefin smoothhound (Mustelus lunulatus) were studied on the basis of analysis of stomach contents of 314 specimens, allowing the diet of this species to be determined by sex, size, and stage of sexual maturity and for changes in the dietary ontogeny to be identified. The prey-specific index of relative importance revealed that the sicklefin smoothhound is a crab predator. Female and male sicklefin smoothhounds consumed a swimming crab species, Achelous iridescens, in similar proportions. Adults and juveniles of both sexes complemented their diets with the Panama mantis shrimp (Squil-la panamensis), the dart squid, Lolliguncula (Loliolopsis) diomedeae, and the crab species Euphylax robustus, indicating behavioral and habitat segregation. Ontogenetic changes in diet were identified, with juveniles feeding almost exclusively on A. iridescens and adults having a more varied diet. The diet of sicklefin smoothhounds also changed with size: Sharks ≤90 cm in total length (TL) consumed more A. iridescens, and sharks >90 cm TL fed on a wider variety of prey. These results indicate that the sicklefin smoothhound is a selective mesopredator in the coastal marine food chain, having a significant influence on populations of benthic crustaceans in the southeastern Pacific Ocean.
AB - The feeding habits of thesicklefin smoothhound (Mustelus lunulatus) were studied on the basis of analysis of stomach contents of 314 specimens, allowing the diet of this species to be determined by sex, size, and stage of sexual maturity and for changes in the dietary ontogeny to be identified. The prey-specific index of relative importance revealed that the sicklefin smoothhound is a crab predator. Female and male sicklefin smoothhounds consumed a swimming crab species, Achelous iridescens, in similar proportions. Adults and juveniles of both sexes complemented their diets with the Panama mantis shrimp (Squil-la panamensis), the dart squid, Lolliguncula (Loliolopsis) diomedeae, and the crab species Euphylax robustus, indicating behavioral and habitat segregation. Ontogenetic changes in diet were identified, with juveniles feeding almost exclusively on A. iridescens and adults having a more varied diet. The diet of sicklefin smoothhounds also changed with size: Sharks ≤90 cm in total length (TL) consumed more A. iridescens, and sharks >90 cm TL fed on a wider variety of prey. These results indicate that the sicklefin smoothhound is a selective mesopredator in the coastal marine food chain, having a significant influence on populations of benthic crustaceans in the southeastern Pacific Ocean.
UR - http://www.scopus.com/inward/record.url?scp=85073285449&partnerID=8YFLogxK
U2 - 10.7755/FB.117.3.11
DO - 10.7755/FB.117.3.11
M3 - Artículo
AN - SCOPUS:85073285449
SN - 0090-0656
VL - 117
SP - 245
EP - 257
JO - Fishery Bulletin
JF - Fishery Bulletin
IS - 3
ER -