Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar

Knowledge of the trophic ecology and interactions of marine top predators is fundamental for understanding community structure and dynamics as well as ecosystem function. We examined the feeding relationships of 4 heavily exploited elasmobranchs caught in coastal artisanal shark fisheries in south-w...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	JJ Kiszka, K Charlot, NE Hussey, MR Heithaus, B Simon-Bouhet, F Humber, F Caurant, P Bustamante
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2014
Materias:	Biology (General) QH301-705.5 Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/705695e602244d85a41040f95512a7dc
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:705695e602244d85a41040f95512a7dc
record_format	dspace
spelling	oai:doaj.org-article:705695e602244d85a41040f95512a7dc2021-11-18T09:19:57ZTrophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar1864-77821864-779010.3354/ab00602https://doaj.org/article/705695e602244d85a41040f95512a7dc2014-12-01T00:00:00Zhttps://www.int-res.com/abstracts/ab/v23/n1/p29-38/https://doaj.org/toc/1864-7782https://doaj.org/toc/1864-7790Knowledge of the trophic ecology and interactions of marine top predators is fundamental for understanding community structure and dynamics as well as ecosystem function. We examined the feeding relationships of 4 heavily exploited elasmobranchs caught in coastal artisanal shark fisheries in south-western Madagascar in 2009 and 2010—Sphyrna lewini, Loxodon macrorhinus, Carcharhinus falciformis and Rhynchobatus djiddensis—using stable isotope (δ15N and δ13C) analysis. Relative trophic position (indicated by δ15N) and foraging location (indicated by δ13C) differed among species. Isotopic niche width was highly variable: more pelagic species, such as S. lewini and C. falciformis, had the broadest isotopic niches while the benthic R. djiddensis had the narrowest. A high percentage of niche overlap occurred between R. djiddensis and 2 of the species, C. falciformis (93.2%) and L. macrorhinus (73.2%), and to a lesser extent S. lewini (13.3%). Relative trophic position of S. lewini significantly increased with size, suggesting a dietary shift with age. Sex differences in δ15N values were observed in L. macrorhinus, suggesting intraspecific niche partitioning. Variation in stable isotope values among these 4 highly exploited elasmobranch species indicates trophic structuring, likely driven by differences in diet and habitat use as well as by size and sex. This study provides the first baseline information on the trophic ecology of elasmobranchs caught in artisanal fisheries from south-western Madagascar.JJ KiszkaK CharlotNE HusseyMR HeithausB Simon-BouhetF HumberF CaurantP BustamanteInter-ResearcharticleBiology (General)QH301-705.5MicrobiologyQR1-502ENAquatic Biology, Vol 23, Iss 1, Pp 29-38 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5 Microbiology QR1-502
spellingShingle	Biology (General) QH301-705.5 Microbiology QR1-502 JJ Kiszka K Charlot NE Hussey MR Heithaus B Simon-Bouhet F Humber F Caurant P Bustamante Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar
description	Knowledge of the trophic ecology and interactions of marine top predators is fundamental for understanding community structure and dynamics as well as ecosystem function. We examined the feeding relationships of 4 heavily exploited elasmobranchs caught in coastal artisanal shark fisheries in south-western Madagascar in 2009 and 2010—Sphyrna lewini, Loxodon macrorhinus, Carcharhinus falciformis and Rhynchobatus djiddensis—using stable isotope (δ15N and δ13C) analysis. Relative trophic position (indicated by δ15N) and foraging location (indicated by δ13C) differed among species. Isotopic niche width was highly variable: more pelagic species, such as S. lewini and C. falciformis, had the broadest isotopic niches while the benthic R. djiddensis had the narrowest. A high percentage of niche overlap occurred between R. djiddensis and 2 of the species, C. falciformis (93.2%) and L. macrorhinus (73.2%), and to a lesser extent S. lewini (13.3%). Relative trophic position of S. lewini significantly increased with size, suggesting a dietary shift with age. Sex differences in δ15N values were observed in L. macrorhinus, suggesting intraspecific niche partitioning. Variation in stable isotope values among these 4 highly exploited elasmobranch species indicates trophic structuring, likely driven by differences in diet and habitat use as well as by size and sex. This study provides the first baseline information on the trophic ecology of elasmobranchs caught in artisanal fisheries from south-western Madagascar.
format	article
author	JJ Kiszka K Charlot NE Hussey MR Heithaus B Simon-Bouhet F Humber F Caurant P Bustamante
author_facet	JJ Kiszka K Charlot NE Hussey MR Heithaus B Simon-Bouhet F Humber F Caurant P Bustamante
author_sort	JJ Kiszka
title	Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar
title_short	Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar
title_full	Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar
title_fullStr	Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar
title_full_unstemmed	Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar
title_sort	trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western madagascar
publisher	Inter-Research
publishDate	2014
url	https://doaj.org/article/705695e602244d85a41040f95512a7dc
work_keys_str_mv	AT jjkiszka trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT kcharlot trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT nehussey trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT mrheithaus trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT bsimonbouhet trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT fhumber trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT fcaurant trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar AT pbustamante trophicecologyofcommonelasmobranchsexploitedbyartisanalsharkfisheriesoffsouthwesternmadagascar
_version_	1718420907499716608

Trophic ecology of common elasmobranchs exploited by artisanal shark fisheries off south‑western Madagascar

Ejemplares similares