SOCIAL-BEHAVIOR AND FEEDING ABILITY OF 2 PHENOTYPES OF GASTEROSTEUS-ACULEATUS IN RELATION TO THEIR SPATIAL AND TROPHIC SEGREGATION IN A TEMPERATE LAKE

被引:114
作者
LARSON, GL [1 ]
机构
[1] UNIV BRITISH COLUMBIA, DEPT ZOOL, VANCOUVER, BRITISH COLUMBI, CANADA
关键词
D O I
10.1139/z76-012
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Significant differences in morphology, behavior, spatial distribution and feeding habits were found between limnetic and benthic forms of the threespine stickleback (G. aculeatus) in a small British Columbia [Canada] lake. The social behavior and feeding ability of each form were studied experimentally to provide a basis for determining the mechanisms of spatial and trophic segregation observed in the lake. The hypothesis that the benthic form was solitary, aggressive, and attracted to lake-bottom cover, and the limnetic form was gregarious, nonaggressive, and attracted to lake-surface cover was supported by the laboratory experiments. Furthermore, the hypothesis that the limnetic form could feed more successfully on zooplankton, and the benthic form on macrobenthos was supported by the experiments. The benthic form spent significantly more time in seach of food in lake-bottom cover than did the limnetic form. It is suggested that the 2 forms of stickleback had undergone extensive adaptations to very different habitats in the lake, and therefore, their spatial and food segregation was not maintained entirely by interactions, but at least partially by inherent behavioral differences.
引用
收藏
页码:107 / 121
页数:15
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