INVESTIGADORES
BARBINI Santiago Aldo
artículos
Título:
Ontogenetic diet shifts and food partitioning between two small sympatric skates (Chondrichthyes, Rajidae) in the Southwestern Atlantic
Autor/es:
BARBINI, SANTIAGO A.; LUCIFORA, LUIS O.
Revista:
MARINE AND FRESHWATER RESEARCH
Editorial:
CSIRO PUBLISHING
Referencias:
Lugar: Collingwood; Año: 2012 vol. 63 p. 905 - 913
ISSN:
1323-1650
Resumen:
Knowing howsympatric species partition their resources is very important for understanding themechanisms
that influencemarine community structure.We test the hypothesis of resource partitioning between two sympatric, closely
related, morphologically similar, small skates, Psammobatis bergiandP. extenta. The diets of the two species were
different.P. bergifed predominantly on crabs, amphipods, isopods and polychaetes. P. extentaconsumed mainly
amphipods and shrimps. Changes in the diet with body size, maturity stage and season varied among species. The
consumption of amphipods decreased with increasing size of both species. The consumption of crabs increased with
increasing size ofP. bergi, but decreasedwith increasing size ofP. extenta. The consumption of cumaceans increasedwith
size ofP. extentaand decreased with size ofP. bergi. Adults preyed on isopods more heavily than juveniles for both
species.P. extentapreyed on shrimps more heavily in the warm season and, on the contraryP. bergipreyed on shrimps
more often in the cold season. The dietary breadthwas higher inP. bergithan inP. extentaandwas higher in females than
in males. Our results showed that these sympatric and closely-related species have clearly different trophic traits.