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Optimal feeding strategy of the temperate herbivorous fish Aplodactylus punctatus: the effects of food availability on digestive and reproductive patterns

Differences in feeding behavior of populations of the marine temperate herbivorous fish Aplodactylus punctatus, in three different localities off the Chilean coast, which differ qualitatively and quantitatively in food availability were examined. Tests were conducted on whether food selection follow...

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Published in:Oecologia 1994-09, Vol.99 (1-2), p.118-123
Main Authors: Caceres, C.W. (Chile Univ., Santiago (Chile). Dept. de Ciencias Ecologicas. Facultad de Ciencias), Fuentes, L.S, Ojeda, F.P
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description Differences in feeding behavior of populations of the marine temperate herbivorous fish Aplodactylus punctatus, in three different localities off the Chilean coast, which differ qualitatively and quantitatively in food availability were examined. Tests were conducted on whether food selection follows optimal foraging strategies, whether there is any modification of the fishes' digestive tracts in relation to their diets, and whether differences in diet quality affect the allocation of energy into reproduction and maintenance in these populations. Samples of this fish and of the understore algal assemblages were taken seasonally from May 1989 to February 1990. For each population dietary composition, weight of the digestive tract and of the food content, the condition factor (K), and the gonadosomatic index (GSI) were analyzed. The results showed that the diet observed in the three populations closely resembled the differences in macroalgal abundance and composition among the three localities studied. Local differences in diet quality were inversely related to the amount of food consumption and size of the digestive tract, suggesting that under differential conditions of food availability A. punctatus is able to compensate for variations in food quality through a flexibility in its digestive strategies. The nutritional status (K) of individuals, and their reproductive pattern (GSI) were directly related to diet quality. These results indicate that although A. punctatus is able to adjust its digestive processes to different algal food regimes, the digestive modifications observed in food-poor environments are not sufficient to compensate for the lack of food and allow fish to reach the nutritional status and reproductive output reached in a food-rich environment.
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identifier ISSN: 0029-8549
ispartof Oecologia, 1994-09, Vol.99 (1-2), p.118-123
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source JSTOR Archival Journals and Primary Sources Collection; Springer Online Journal Archives (Through 1996)
subjects Agnatha. Pisces
ALGAE
Animal and plant ecology
Animal digestion
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Biomass
BUSQUEDA DE ALIMENTO
COMPORTEMENT ALIMENTAIRE
Diet
DIGESTION
Digestive tract
FACTEUR DU MILIEU
FACTORES AMBIENTALES
Food
Food availability
Food sovereignty
Foraging
Fundamental and applied biological sciences. Psychology
HABITOS ALIMENTARIOS
HERBIVORE
Herbivores
HERBIVOROS
Herbivorous fishes
INGESTION DE PIENSOS
Marine
PECES MARINOS
POISSON DE MER
PRISE ALIMENTAIRE (ANIMAUX)
RECHERCHE DE NOURRITURE
VALEUR NUTRITIVE
VALOR NUTRITIVO
Vertebrata
title Optimal feeding strategy of the temperate herbivorous fish Aplodactylus punctatus: the effects of food availability on digestive and reproductive patterns
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