INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Reproduction of landlocked Aplochiton zebra Jenyns (Pisces, Galaxiidae)
Autor/es:
ME LATTUCA; D BROWN; L CASTIÑEIRA; M RENZI; C LUIZON; J URBANSKI; V CUSSAC
Revista:
ECOLOGY OF FRESHWATER FISH
Editorial:
Blackwell
Referencias:
Año: 2008 vol. 17 p. 394 - 405
ISSN:
0906-6691
Resumen:
Abstract Life-history studies comparing landlocked versus diadromous
populations reveal factors associated with life-history evolution under
different scenarios. We describe several aspects of spawning and
development of landlocked Aplochiton zebra in Patagonia (Argentina)
based on the presence of eggs, the gonadal development, the analysis of
otolith daily growth increments validated by tetracycline marking
experiments, and the analysis of standard length frequencies. Among
Patagonian galaxiids, A. zebra showed intermediate size and age at first
maturity and high fecundity, with vitellogenic oocytes covered with short
chorionic filaments. Free embryos of A. zebra were larger than those of
Galaxias maculatus and Galaxias platei. This information is particularly
significant for conservational purposes when we consider the reduced
distribution of landlocked populations of the species and the risks imposed
by salmonid introduction.