The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts

The feeding ecology of Mustelus schmitti was studied based on analysis of stomach contents of 525 specimens collected from three research cruises carried out during October 2008 to March 2009 on the Argentinean continental shelf (34 o45′S-41 oS). Generalized Linear Models were used to test the effec...

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Publicado:	2012
Materias:	Diet Gatuzo Models Narrownose smoothhound Nursery habitat Ontogenetic changes continental shelf dietary shift feeding ecology geographical variation marine ecosystem nursery ground ontogeny shark spatiotemporal analysis stomach content trophic level Atlantic Ocean Atlantic Ocean (Southwest) Crustacea Mustelus schmitti Pisces Polychaeta
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03781909_v95_n1_p99_Belleggia http://hdl.handle.net/20.500.12110/paper_03781909_v95_n1_p99_Belleggia
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_03781909_v95_n1_p99_Belleggia
record_format	dspace
spelling	paper:paper_03781909_v95_n1_p99_Belleggia2023-06-08T15:39:27Z The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts Diet Gatuzo Models Narrownose smoothhound Nursery habitat Ontogenetic changes continental shelf dietary shift feeding ecology geographical variation marine ecosystem nursery ground ontogeny shark spatiotemporal analysis stomach content trophic level Atlantic Ocean Atlantic Ocean (Southwest) Crustacea Mustelus schmitti Pisces Polychaeta The feeding ecology of Mustelus schmitti was studied based on analysis of stomach contents of 525 specimens collected from three research cruises carried out during October 2008 to March 2009 on the Argentinean continental shelf (34 o45′S-41 oS). Generalized Linear Models were used to test the effects of Geographic location, Total Length, Sex and Maturity stage on the diet. The most commonly occurring major prey groups differed between Geographic locations. In Río de la Plata (RLP) deep M. schmitti feed on Crustaceans, Fish and Polychaetes, whereas Crustaceans, Polychaetes and Fishes were the main prey in RLP coast, Rincón (RIN) coast and RIN deep, respectively. Moreover, models showed dietary shift related to total length in each Geographic location. In coastal nursery areas Polychaetes decreased and Fishes increased in importance as M. schmitti grew in size; while Crustaceans increased in importance from small to medium size, and then decreased in the large specimens. Deeper areas also show dietary changes related to growth. The trophic level of M. schmitti showed lower values in coastal Geographic locations (3. 48-3. 53) than in deeper Geographic locations (3. 56-3. 77). The higher trophic role in deeper communities could be related to the size of M. schmitti which increases with depth. Finally, total vacuity index was 2. 47 (the lowest in the literature) indicating an intense and continuous feeding activity of the species. © 2011 Springer Science+Business Media B.V. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03781909_v95_n1_p99_Belleggia http://hdl.handle.net/20.500.12110/paper_03781909_v95_n1_p99_Belleggia
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Diet Gatuzo Models Narrownose smoothhound Nursery habitat Ontogenetic changes continental shelf dietary shift feeding ecology geographical variation marine ecosystem nursery ground ontogeny shark spatiotemporal analysis stomach content trophic level Atlantic Ocean Atlantic Ocean (Southwest) Crustacea Mustelus schmitti Pisces Polychaeta
spellingShingle	Diet Gatuzo Models Narrownose smoothhound Nursery habitat Ontogenetic changes continental shelf dietary shift feeding ecology geographical variation marine ecosystem nursery ground ontogeny shark spatiotemporal analysis stomach content trophic level Atlantic Ocean Atlantic Ocean (Southwest) Crustacea Mustelus schmitti Pisces Polychaeta The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts
topic_facet	Diet Gatuzo Models Narrownose smoothhound Nursery habitat Ontogenetic changes continental shelf dietary shift feeding ecology geographical variation marine ecosystem nursery ground ontogeny shark spatiotemporal analysis stomach content trophic level Atlantic Ocean Atlantic Ocean (Southwest) Crustacea Mustelus schmitti Pisces Polychaeta
description	The feeding ecology of Mustelus schmitti was studied based on analysis of stomach contents of 525 specimens collected from three research cruises carried out during October 2008 to March 2009 on the Argentinean continental shelf (34 o45′S-41 oS). Generalized Linear Models were used to test the effects of Geographic location, Total Length, Sex and Maturity stage on the diet. The most commonly occurring major prey groups differed between Geographic locations. In Río de la Plata (RLP) deep M. schmitti feed on Crustaceans, Fish and Polychaetes, whereas Crustaceans, Polychaetes and Fishes were the main prey in RLP coast, Rincón (RIN) coast and RIN deep, respectively. Moreover, models showed dietary shift related to total length in each Geographic location. In coastal nursery areas Polychaetes decreased and Fishes increased in importance as M. schmitti grew in size; while Crustaceans increased in importance from small to medium size, and then decreased in the large specimens. Deeper areas also show dietary changes related to growth. The trophic level of M. schmitti showed lower values in coastal Geographic locations (3. 48-3. 53) than in deeper Geographic locations (3. 56-3. 77). The higher trophic role in deeper communities could be related to the size of M. schmitti which increases with depth. Finally, total vacuity index was 2. 47 (the lowest in the literature) indicating an intense and continuous feeding activity of the species. © 2011 Springer Science+Business Media B.V.
title	The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts
title_short	The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts
title_full	The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts
title_fullStr	The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts
title_full_unstemmed	The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts
title_sort	feeding ecology of mustelus schmitti in the southwestern atlantic: geographic variations and dietary shifts
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03781909_v95_n1_p99_Belleggia http://hdl.handle.net/20.500.12110/paper_03781909_v95_n1_p99_Belleggia
_version_	1768543804633120768

The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts

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