Mollusks on Leaves of Zostera marina in Notsuke Bay I : Fauna and Growth of the Major Three Species

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  • 野付湾におけるアマモ葉上の貝類 I : 出現種と主要 3 種の成長
  • 野付湾におけるアマモ葉上の貝類-1-出現種と主要3種の成長
  • ノツケワン ニ オケル アマモ ヨウジョウ ノ カイルイ 1 シュツゲンシュ

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Abstract

Mollusks living on leaves of Zostera marina were studied in Notsuke Bay of the eastern Hokkaido. One pelecypod and 15 gastropod species were collected by Marutoku net-B (45cm in mouth diameter, 0.33mm in mesh aperture) in the Zostera belt. Among them, the most abundant species was Barleeia angustata followed by Epheria decorata, Lirularia iridescens, Alvania concinna and Homalopoma sangarense in decreasing order. B. angustata, E. decorata and L. iridescens occurred throughout the year in most of the Zostera belt. Newly born juveniles of these three species came to appearance in June and grew rapidly during summer and autumn, so they approached their full-grown size in the next spring. Batillaria cumingii, Mitrella tenuis and Reticunassa fraterucula hypolia were abundantly found on the sandy or muddy bottoms of the bay, but they were very rare in the Zostera belt.

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