Comparison of Early Life History of Native and Exotic Mytilids, <i>Musculista senhousia</i> and <i>Xenostrobus securis</i>, in the Brackish Lake Hamana, Japan

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  • 浜名湖における在来種ホトトギスガイと外来種コウロエンカワヒバリガイの初期生活史の比較
  • Comparison of Early Life History of Native and Exotic Mytilids, Musculista senhousia and Xenostrobus securis, in the Brackish Lake Hamana, Japan

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During the period 1991–1992, we examined temporal fluctuations in densities of the native and exotic mytilids Musculista senhousia and Xenostrobus securis in the brackish Lake Hamana on the Pacific coast of central Japan, using cohort separation of planktonic stages and benthic stages (i.e., new settlers and small individuals). Temporal fluctuations in densities of both planktonic and benthic stages were similar between the two species. However, the densities of benthic stages were much higher for M. senhousia than for X. securis. There was a similar trend of variation in densities of benthic stages among sampling sites for each mytilid. This suggests that microhabitat separation of large individuals (≥ 1.0 mm in shell length) between these two species may be determined at the post-recruitment stage, when X. securis individuals with shell lengths of ≥ 2.0 mm probably immigrate into the study area from other areas.

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