Interações agonísticas e forrageamento do peixe-donzela, Stegastes fuscus (Peciformes: Pomacentridae)
Abstract
Damselfishes from the genus Stegastes display aggressive behavior towards other herbivores inside their territories. Models developed to explain this territorial defense have focused on the cost of territorial defense, as measured by changes in time allocated to feeding, as a key determinant of the evolutionary stability of this behavior. In the present work, feeding and chasing behavior rates were measured in the common Brazilian damselfish (Stegastes fuscus) to test if feeding time decreases as time spent in agonistic interactions increases. Furthermore, we tested if juveniles have higher feeding rates than adults due to higher size–specific metabolic rates, and if adults have higher chasing rates than juveniles. The correlation between feeding and chasing rates were not significant (r=-0.122). Mean number of bites on algae at different life stages were also not significantly different (ANOVA F= 2.864; p= 0.067). Mean chasing bouts of juveniles were significantly lower than for subadults and adults (ANOVA F= 3.629; p= 0.034; SNK juvenile < subadult = adult). Adults and subadults seem to spend more time in agonistic behavior due to their dominance of territories based on aggressive behavior and larger size. These data suggest that the time S. fuscus invests in territory defense does not affect its feeding rates, and that the cost to feeding time of agonistic behavior appears to be minimal for this species.
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