BEHAVIORAL DIFFERENTIATION OF ADJACENT MARINE AND FLUVIAL POPULATIONS OF THREESPINE STICKLEBACK IN CALIFORNIA: A LABORATORY STUDY by HARMAN V.S. PEEKE 1,2,3) and LANCE E. MORGAN 2,4,5) ( 1 Department of Psychiatry, University of California, San Francisco, USA; 2 Bodega Marine Laboratory, University of California, Davis, USA; 4 Tiburon /Santa Cruz Laboratory National Marine Fisheries Service, USA) (Acc. 25-II-2000) Summary 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 sh. Different predators and predation pressures are discussed as one possible factor in the evolution of these behavioral variations. 3) Corresponding author; address: Bodega Marine Laboratory, P.O. Box 247, Bodega Bay, CA 94923, USA. 5) The authors wish to express their profound gratitude to Professor W.J. Rowland for providing duplicates of his models of gravid females for our use. We also wish to thank the
Behaviour – Brill
Published: Jan 1, 2000
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