BEHAVIORAL DIFFERENTIATION OF ADJACENT MARINE AND FLUVIAL POPULATIONS OF THREESPINE STICKLEBACK IN CALIFORNIA: A LABORATORY STUDY

in Behaviour
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Abstract

Threespine sticklebacks (Gasterosteus aculeatus) from marine, estuarine and upstream fresh water were collected from two coastal watersheds in northern California. Laboratory tests of response to behavioral stimuli associated with aggression, courtship and feeding show interpopulation variation. Behavioral responses of populations from the same habitat type were similar, and individuals from up-stream habitats were generally more responsive to stimuli than individuals from the estuarine environments, which in turn were more responsive than marine fish. Different predators and predation pressures are discussed as one possible factor in the evolution of these behavioral variations.

BEHAVIORAL DIFFERENTIATION OF ADJACENT MARINE AND FLUVIAL POPULATIONS OF THREESPINE STICKLEBACK IN CALIFORNIA: A LABORATORY STUDY

in Behaviour

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