Current reproductive situation in a reduced population of juvenile mussels (<i>Unio douglasiae</i>) at a eutrophic lake
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- YOSHIDA Tooru
- 秋田県立大学生物資源科学研究科
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- FUJIBAYASHI Megumu
- 秋田県立大学生物資源科学部
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- TANAKA Hitoshi
- 埼玉県環境科学国際センター
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- OKANO Kunihiro
- 秋田県立大学生物資源科学部
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- TAKADA Yoshihiro
- 秋田県水産振興センター
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- MIYATA Naoyuki
- 秋田県立大学生物資源科学部
Bibliographic Information
- Other Title
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- 富栄養湖沼における若年個体が少ないイシガイ個体群の再生産状況
- フ エイヨウ コショウ ニ オケル ジャクネン コタイ ガ スクナイ イシガイ コタイグン ノ サイセイサン ジョウキョウ
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Abstract
<p> Unionid mussels play an important role in the cycling and removal of suspended substances from freshwater ecosystems. Unfortunately, their populations are declining worldwide. Although the mechanism for that is unclear, one possible reason may be a reproductive disturbance, because previous studies have reported that the numbers of young and juvenile mussels are few. In this study, we focused on Unio douglasiae nipponensis, which inhabit Lake Hachiro in Akita Prefecture; and we identified when and whether larvae were released by parent mussels. Host fish were also identified. As a result, we discovered that larvae were released from June to July, and that the host fish were gobies (Tridentiger brevispinis). However, juvenile mussels were rare in that location. There is another possibility for unionid mussel reduction, such as the muddy lake bed in Hachiro. To conserve Unio douglasiae nipponensis, further surveys are needed.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 75 (7), III_265-III_272, 2019
Japan Society of Civil Engineers