Role of sexual selection in relation to immunosuppression of testosterone on evolution of sexual dimorphisms in fish
Project/Area Number |
19770015
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Research Category |
Grant-in-Aid for Young Scientists (B)
|
Allocation Type | Single-year Grants |
Research Field |
Ecology/Environment
|
Research Institution | Nagano University |
Principal Investigator |
TAKAHASHI Daisuke Nagano University, 環境ツーリズム学部, 准教授 (90422922)
|
Project Period (FY) |
2007 – 2009
|
Project Status |
Completed (Fiscal Year 2009)
|
Budget Amount *help |
¥3,650,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥450,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,700,000 (Direct Cost: ¥1,700,000)
|
Keywords | 生態学 / 性淘汰 / ハンディキャップ原理 / 免疫能 / 雄性ホルモン / 魚類 |
Research Abstract |
The immunocompetence handicap hypothesis (ICHH) assumes that males with attractive sexual ornamentation are more handicapped than their less ornamented rivals because of the immunosuppressive androgens required for the production of secondary sexual characters. The predictions of ICHH were tested in freshwater fishes. The present results supported assumptions of ICHH [1) females prefer males with exaggerative sexual traits, 2) expressions of male sexual traits used in female choice are controlled by androgens, 3) androgens have immunosuppressive effects] in the pale chub Zacco platypus (Cyprinidae). This study suggests that ICHH is useful as a model of evolution of sexual dimorphisms in fishes.
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Report
(4 results)
Research Products
(8 results)