CEPAVE   05420
CENTRO DE ESTUDIOS PARASITOLOGICOS Y DE VECTORES
Unidad Ejecutora - UE
artículos
Título:
Similarity in parasite community structure to trace latitudinal migrations of Odontesthes smitti (Pisces: Atherinopsidae) in Argentinean coasts.
Autor/es:
CARBALLO M.C.; CREMONTE F.; G.T. NAVONE .; TIMI J.
Revista:
MARINE BIOLOGY
Editorial:
SPRINGER
Referencias:
Año: 2011
ISSN:
0025-3162
Resumen:
The aims of this study were to determine the existence of migratory movements, and to identify ecological stocks of the silverside Odontesthes smitti along its distribution in the Southern Atlantic, using metazoan parasites as biological tags. Samples were obtained from San José Gulf (SJ) (42°25’S- 64°07’W) and Nuevo Gulf (NG) (42°47’S-65°02’W) in north Patagonia during winter and summer, and in waters off Mar del Plata (MDP) (38°03’S-57°32’W), Bonaerense region, during winter. Fifteen parasite species were collected. Multivariate statistical procedures on parasite community data showed strong effect of host size on the structure of parasite assemblage. However, taking into account the variations among samples due to host size, differential structure of parasite community observed between SJ and NG suggest that fish inhabiting these localities could belong to different ecological stocks. On the other hand, fish from MDP and SJ caught in summer showed similar composition in their parasite assemblages, which is congruent with a migratory cycle that implies that fish caught in MDP during winter inhabit SJ during summer. Further evidence of the Patagonian origin of MDP silversides is the presence of Proctotrema bartolii (Digenea) in fish from both regions. Proctotrema bartolii is acquired by silversides only in the Magellanic province, where its intermediate host, Darina solenoides, is distributed.The analyses suggest that O. smitti inhabiting north Patagonian gulfs could belong to different ecological stocks and that silversides caught in MDP could have come from SJ.