Seasonal flow patterns of the glochidia of the freshwater unionid mussel <I>Inversiunio jokohamensis</I> in a paddy field ditch investigated using a plankton net

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  • プランクトンネットを用いて確認されたヨコハマシジラガイ幼生の流下挙動
  • プランクトンネット オ モチイテ カクニン サレタ ヨコハマシジラガイヨウセイ ノ リュウカ キョドウ
  • Seasonal flow patterns of the glochidia of the freshwater unionid mussel Inversiunio jokohamensis in a paddy field ditch investigated using a plankton net

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Abstract

Seasonal flow patterns of the glochidia of the freshwater unionid mussel Inversiunio jokohamensis were investigated using a plankton net (5 × 20 cm frame, 0.113 mm mesh) in a paddy field ditch. Living glochidia were collected from February to May, being most abundant in February. Dead glochidium shells were collected from February to October, being most abundant in May. A few non-mature eggs were collected in March and May. Our study shows that a plankton net is useful to investigate the flow patterns and spawning seasons of the glochidia of I. jokohamensis.

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