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Gastropod relevance in predator–prey interactions on a benthic shallow sandy ecosystem at Mar del Plata, Argentina (38°S)

Published online by Cambridge University Press:  05 February 2018

F. Arrighetti*
Affiliation:
CONICET-Museo Argentino de Ciencias Naturales, Av. Angel Gallardo 470 3° piso lab 80, C1405DJR Ciudad Autónoma de Buenos Aires, Argentina
V. Teso
Affiliation:
CONICET-Museo Argentino de Ciencias Naturales, Av. Angel Gallardo 470 3° piso lab 80, C1405DJR Ciudad Autónoma de Buenos Aires, Argentina
T. Brey
Affiliation:
Alfred Wegener Institute for Polar and Marine Research (AWI), PO Box 120161, 27570 Bremerhaven, Germany
P.E. Penchaszadeh
Affiliation:
CONICET-Museo Argentino de Ciencias Naturales, Av. Angel Gallardo 470 3° piso lab 80, C1405DJR Ciudad Autónoma de Buenos Aires, Argentina
*
Correspondence should be addressed to: F. Arrighetti CONICET-Museo Argentino de Ciencias Naturales, Av. Angel Gallardo 470 3° piso lab 80, C1405DJR Ciudad Autónoma de Buenos Aires, Argentina email: farrighetti@macn.gov.ar

Abstract

The shallow sandy marine subtidal ecosystem off Mar del Plata, Argentina, is the scene of multiple fisheries activities, in particular the prawn–shrimp Artemesia longinaris and Pleoticus muelleri grounds. We examined the δ13C vs δ15N isotope signatures of 22 species commonly found in the area in order to understand how this ecosystem supports the fishery, with special emphasis on imposex-affected gastropod populations. Our results indicate that the main food source for Olivancillaria urceus and Buccinanops monilifer were bivalves and crustaceans. Buccinanops duartei and Olivancillaria carcellesi feed on bivalves and also on macroalgae. These findings indicate, for the first time, a slight selectivity of some of the gastropods studied for local drifted algal sources and how gastropods may scavenge available food from by-catch returned to the sea. The fishes Urophysis brasiliensis and Callorhynchus callorhynchus appeared to be the top predators of this area with B. duartei and O. carcellesi constituting important components of their diet.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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