書誌事項
- タイトル別名
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- The variation of life history traits of Macrophthalmus japonicus De Haan (Ocypodidae : Decapoda) according to environmental heterogeneity
- I. The problems to be solved
- I、その間題点について
説明
Ecological characteristics of Maeropntnalmus japonwus populations were studied in two different parts of a small intertidal mud-flat in Amakusa, west Kyushu. These two places, the upper shore and the lower shore, are separated each other by artificial bank with a narrow creek, and characterized by different nutritional conditions and physical factors related to the difference of the time of exposure to the air. Difference of size composition in-two subpopulations was explained by differences in the intensity of settlement, mortality in prereproductive age and longevity at two places. The lower shore crabs show larger growth rates, earlier sexual maturity, larger size at first reproduction. The brood size and the mean egg size were also different in two subpopulations, the lower subpopulation produce smaller brooding size in larger egg size, and the upper subpopulation produce larger brood size in smaller egg size. The difference of such life history traits in different local populations often regarded as the result of natural selection. In this case, however, genetic difference may not be expected because of complete mixing during the pelagic larval period. From this viewpoint, non-genetical variance of life history traits and the problems to be solved were discussed.
収録刊行物
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- 日本ベントス研究会誌
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日本ベントス研究会誌 1984 (27), 28-37, 1984-10-31
日本ベントス学会
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詳細情報 詳細情報について
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- CRID
- 1390282680296901504
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- NII論文ID
- 130001567204
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- ISSN
- 18838898
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
