Differences in Clutch Size and Host Recognition by Glochidia between Summer and Winter Breeders of Japanese Unionid Mussels

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  • 日本産イシガイ類の抱卵数と宿主選択性
  • 日本産イシガイ類の抱卵数と宿主選択性〔英文〕
  • ニホンサン イシガイルイ ノ ホウランスウ ト シュクシュ センタクセイ エイ

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Abstract

Clutch size (number of eggs in the marsupia) and hosts of glochidia were examined for 5 summer breeders and 3 winter breeders of Japanese unionid mussels. Clutch size was smaller in the summer breeder than in the winter breeder, when the size of glochidia was similar. Most glochidia of summer breeder left the nonhost fish within 1 day after attachment, which suggests that they can select the proper host. The reduction of reproductive cost by acquirement of the ability of host recognition may allow the summer breeder to grow and breed at the same time. On the other hand, winter breeder may produce more eggs to compensate the little probability of coming into contact with fish due to the low fish activity in winter.

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