Two morphological types in the reproductive stock of three-spined stickleback, Gasterosteus aculeatus, in Lake Harutori, Hokkaido Island
Two morphological types in the reproductive stock of three-spined stickleback, Gasterosteus aculeatus, in Lake Harutori, Hokkaido Island
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北海道春取湖三刺刺鱼 Gasterosteus aculeatus 繁殖种群的两种形态类型
DOI：
10.1007/bf00004901
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发表时间：
2004
影响因子：
1.4
通讯作者：
Seiichi Mori
中科院分区：
文献类型：
--
作者：
Seiichi Mori
SynopsisTwo morphological types of the trachurus form (completely plated morph) of three-spined stickleback, Gasterosteus aculeatus, are found in Lake Harutori, Kushiro, east district of Hokkaido Island. For convenience, the two forms are referred to as ‘large type’ and ‘small type’ on the basis of body length (discrimination at 70 mm in length). The two types were examined for morphometric, meristic and reproductive characteristics. They differ in body length, the number of lateral plates, means of the 2nd dorsal spine length/body length and of the pelvic spine length/body length, the relationship between body length and head length, between body length and gonad weight, between body weight and gonad weight, and between body length and ovarian egg number; significant differences were present for each sex. These two types were compared with the anadromous stickleback migrating into the freshwater area near Lake Harutori to breed. The anadromous fish was morphologically much more similar to the large type than the small type. It is suggested that the large type is also an anadromous form and the small type is the permanent freshwater resident.
