INVESTIGADORES
CUSSAC Victor Enrique
artículos
Título:
Predator associated morphology in Galaxias platei in Patagonian lakes
Autor/es:
MILANO, D.; V. E. CUSSAC; P. J. MACCHI; D. E. RUZZANTE; M. F. ALONSO; P. H. VIGLIANO; M. A. DENEGRI
Revista:
JOURNAL OF FISH BIOLOGY
Editorial:
Academic Press
Referencias:
Año: 2002 vol. 61 p. 138 - 156
ISSN:
0022-1112
Resumen:
Among 158 Galaxias platei individuals, collected from nine deep Andean lakes and from one
shallow lake on the Patagonian steppe, morphological characters associated with caudal fin
length were negatively correlated with predation intensity as measured by the incidence of
piscivory. Fish from lakes with high rates of piscivory had relatively short caudal fins and those
from lakes with low piscivory had long caudal fins. It is hypothesized that in this species caudal
fin length affects swimming ability and thus, ability to escape from predators. The population
of G. platei from Lake Espejo with an intermediate level of piscivory contained individuals with
both long and short caudal fins. Morphological variation within this lake was related to the
exploitation of food resources and habitat; individuals with shorter tails ate more amphipods
and inhabited shallower habitats. The results indicated that while the among-lakes morphological
variation in G. platei was influenced largely by differences in predation intensity,
within-lake morphological variation, where predation was intermediate, appeared to be affected
by both predation and differences in the exploitation of food resources.Galaxias platei individuals, collected from nine deep Andean lakes and from one
shallow lake on the Patagonian steppe, morphological characters associated with caudal fin
length were negatively correlated with predation intensity as measured by the incidence of
piscivory. Fish from lakes with high rates of piscivory had relatively short caudal fins and those
from lakes with low piscivory had long caudal fins. It is hypothesized that in this species caudal
fin length affects swimming ability and thus, ability to escape from predators. The population
of G. platei from Lake Espejo with an intermediate level of piscivory contained individuals with
both long and short caudal fins. Morphological variation within this lake was related to the
exploitation of food resources and habitat; individuals with shorter tails ate more amphipods
and inhabited shallower habitats. The results indicated that while the among-lakes morphological
variation in G. platei was influenced largely by differences in predation intensity,
within-lake morphological variation, where predation was intermediate, appeared to be affected
by both predation and differences in the exploitation of food resources.ffects swimming ability and thus, ability to escape from predators. The population
of G. platei from Lake Espejo with an intermediate level of piscivory contained individuals with
both long and short caudal fins. Morphological variation within this lake was related to the
exploitation of food resources and habitat; individuals with shorter tails ate more amphipods
and inhabited shallower habitats. The results indicated that while the among-lakes morphological
variation in G. platei was influenced largely by differences in predation intensity,
within-lake morphological variation, where predation was intermediate, appeared to be affected
by both predation and differences in the exploitation of food resources.G. platei from Lake Espejo with an intermediate level of piscivory contained individuals with
both long and short caudal fins. Morphological variation within this lake was related to the
exploitation of food resources and habitat; individuals with shorter tails ate more amphipods
and inhabited shallower habitats. The results indicated that while the among-lakes morphological
variation in G. platei was influenced largely by differences in predation intensity,
within-lake morphological variation, where predation was intermediate, appeared to be affected
by both predation and differences in the exploitation of food resources.G. platei was influenced largely by differences in predation intensity,
within-lake morphological variation, where predation was intermediate, appeared to be affected
by both predation and differences in the exploitation of food resources.ffected
by both predation and differences in the exploitation of food resources.fferences in the exploitation of food resources.