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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Autor principal: Belleggia, M.
Otros Autores: Figueroa, D.E, Sánchez, F., Bremec, C.
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Publicado: 2012
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100 1 |a Belleggia, M. 
245 1 4 |a The feeding ecology of Mustelus schmitti in the southwestern Atlantic: Geographic variations and dietary shifts 
260 |c 2012 
270 1 0 |m Belleggia, M.; Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo N1, Mar del Plata, Argentina; email: belleggia@inidep.edu.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
593 |a Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo N1, Mar del Plata, Argentina 
593 |a Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, Buenos Aires, Argentina 
593 |a Laboratorio de Ictiología, FCEyN, Universidad Nacional de Mar del Plata (UNMdP), Funes 3350, Mar del Plata, Argentina 
690 1 0 |a DIET 
690 1 0 |a GATUZO 
690 1 0 |a MODELS 
690 1 0 |a NARROWNOSE SMOOTHHOUND 
690 1 0 |a NURSERY HABITAT 
690 1 0 |a ONTOGENETIC CHANGES 
690 1 0 |a CONTINENTAL SHELF 
690 1 0 |a DIETARY SHIFT 
690 1 0 |a FEEDING ECOLOGY 
690 1 0 |a GEOGRAPHICAL VARIATION 
690 1 0 |a MARINE ECOSYSTEM 
690 1 0 |a NURSERY GROUND 
690 1 0 |a ONTOGENY 
690 1 0 |a SHARK 
690 1 0 |a SPATIOTEMPORAL ANALYSIS 
690 1 0 |a STOMACH CONTENT 
690 1 0 |a TROPHIC LEVEL 
690 1 0 |a ATLANTIC OCEAN 
690 1 0 |a ATLANTIC OCEAN (SOUTHWEST) 
690 1 0 |a CRUSTACEA 
690 1 0 |a MUSTELUS SCHMITTI 
690 1 0 |a PISCES 
690 1 0 |a POLYCHAETA 
700 1 |a Figueroa, D.E. 
700 1 |a Sánchez, F. 
700 1 |a Bremec, C. 
773 0 |d 2012  |g v. 95  |h pp. 99-114  |k n. 1  |p Environ. Biol. Fishes  |x 03781909  |t Environmental Biology of Fishes 
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