info:eu-repo/semantics/article
Age and growth of diadromous Galaxias maculatus (Jenyns, 1842) in southernmost South America (54° S) including contribution of age classes to reproduction
Fecha
2018-07Registro en:
Rojo, Javier Hernán; Figueroa, Daniel Enrique; Boy, Claudia Clementina; Age and growth of diadromous Galaxias maculatus (Jenyns, 1842) in southernmost South America (54° S) including contribution of age classes to reproduction; Springer; Environmental Biology of Fishes; 101; 7; 7-2018; 1149-1160
0378-1909
1573-5133
CONICET Digital
CONICET
Autor
Rojo, Javier Hernán
Figueroa, Daniel Enrique
Boy, Claudia Clementina
Resumen
The population of Galaxias maculatus studied here, Arroyo Negro (54° S), is located at the southern extreme of the species distribution. This is the first work on growth and other life history traits of a Fueguian diadromous population based on otoliths study. This species is part of the native fish fauna of Patagonia. Furthermore, studies on the growth and reproduction of G. maculatus in South America mostly refer to freshwater populations of Andean-Patagonian lakes and rivers (about 41° S). Size cohorts were studied; age and growth parameters were estimated, the latter using the VBGM. Four size cohorts were established, and 3+ was determined as maximum age class. No differences were found in growth curves between males and females. The 1+ age class was by far not only the most numerous in the population but also the most represented in the reproductive population. The relation between mean TL and latitude was positive (r = 0.62) for South American populations; however, further studies are needed to determine whether it is this population’s life strategy, the local adaptation of a peripheral population or countergradient growth. The results are interpreted in the context of the information available for other populations, and provide important information about the plasticity in life history traits of this species.