PERSONAL DE APOYO
MAROÑAS Miriam Edith
congresos y reuniones científicas
Título:
Diet of Pimelodella laticeps (Siluriformes: Heptapteridae) in La Choza small stream, Buenos Aires, Argentina
Autor/es:
MAROÑAS, M. E.; SENDRA, E. D.; BRANCOLINI, F.
Lugar:
St. Louis, Missouri,
Reunión:
Simposio; 2nd International Catfish Symposium. Conservation, ecology, management; 2010
Resumen:
Diet of Pimelodella laticeps (Siluriformes: Heptapteridae) in La Choza small stream, Buenos
Aires, Argentina.
As part of
the project Global changes in river systems: effects on biodiversity, food web
and system functioning (GLOBRIO), the diet of P. laticeps was
studied. This species has a permanent presence and is one of the dominant taxa
of the fish community. Despite its importance, both in lotic and lentic
environments in Argentina, little is known about their food habits. The
sampling was conducted in spring 2007in two sites with different environmental
characteristics. The analysis was carried out on the anterior third of the
digestive tract of 40 specimens. In each stomach food items identified
taxonomic determination was conducted as accurately as possible. For each
sampling site was calculated the frequency of occurrence and weight
percentages. Weight per item was obtained for the pool of stomachs contents.
The analysis was completed with a measure of the feeding importance. According
to feeding habits, P. laticeps corresponds to a kind
associated with the benthos and the surface film of water, markedly carnivorous
in both sampling sites. The results of this study agree with those obtained for
the population of Chascomús shallow lake (Buenos Aires, Argentina). Based on
frequency of foods identified, the composition of the diet agrees in that it is
very diverse and as to the low trophic niche fidelity exhibited by the species.