INVESTIGADORES
VOLPEDO Alejandra Vanina
artículos
Título:
Nursery areas and connectivity of the adults anadromous catfish (Genidens barbus) revealed by otolith core microchemistry in the southwestern Atlantic Ocean
Autor/es:
ESTEBAN AVIGLIANO; BARBARA CARVALHO; GONZALO VELASCO; PAMELA TRIPODI; MARCELO VIANNA; ALEJANDRA V. VOLPEDO
Revista:
Marine & Freshwater Research
Editorial:
CSIRO
Referencias:
Año: 2016 p. 1 - 10
Resumen:
The anadromous catfish Genidens barbus is a commercial andvulnerable species from South America. The aims of the present study was toassess whether the nursery areas can be discriminated by using lapillus otolith microchemicalsignatures, to assess the accuracy of classifying fish in relation to natalnursery area and discuss the possibilityof existence of homing behavior. Thus, the otolith core chemical signature(Ba:Ca, Li:Ca, Mg:Ca, Mn:Ca, Sr:Ca; and Zn:Ca ratios) of adult fish wascompared among different estuaries (De La Plata River in Argentina, and PatosLagoon, Paranagu√° Bay and Guanabara Bay in Brazil). PERMANOVA analysis revealedsignificant differences in the multi-element signatures of the otolith corebetween sampling sites for all cohorts (2002, 2003, 2006 and 2007), indicating the techniquehas considerable potential for use in future assessments of populationconnectivity and nursery areas of G.barbus. Via quadratic discriminant function analysis, fish were classified backto natal nursery areas with 80-100% cross-validation classification accuracies. These results suggest that a high level of spatialsegregation exists in adult catfish life and homing behavior cannot be ruledout with our data