和歌山県田辺湾内ノ浦の潮間帯のコアマモ<i>Zostera japonica</i> 群落におけるウメノハナガイ<i>Pillucina pisidium</i>（二枚貝綱，ツキガイ科）の分布と生息環境

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  • 上出 貴士
    和歌山県農林水産総合技術センター水産試験場
  • 山内 信
    和歌山県農林水産総合技術センター水産試験場
  • 高橋 芳明
    和歌山県農林水産総合技術センター水産試験場

書誌事項

タイトル別名
  • Distribution and Habitat Environment of <i>Pillucina pisidium</i> (Bivalvia, Licinidae) in <i>Zostera japonica</i> Beds in the Intertidal Zone at Uchinoura, Tanabe Bay, Wakayama, Japan
  • 和歌山県田辺湾内ノ浦の潮間帯のコアマモZostera japonica群落におけるウメノハナガイPillucina pisidium(二枚貝綱,ツキガイ科)の分布と生息環境
  • ワカヤマケン タナベワン ナイノウラ ノ チョウカンタイ ノ コアマモ Zostera japonica グンラク ニ オケル ウメノハナガイ Pillucina pisidium(ニマイガイ ズナ,ツキガイカ)ノ ブンプ ト セイソク カンキョウ

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抄録

The distribution pattern of Pillucina pisidium in intertidal Zostera japonica beds at Uchinoura, Tanabe Bay, Wakayama, Japan was studied and compared with other environments. P. pisidium was distributed widely throughout the study area. The mean density (± SD) of P. pisidium was 1,892.9 ± 3,795.3 and 394.7 ± 265.1 individuals/m2 in the Z. japonica beds and the bare sandy bottom, respectively. The mean wet weight at each location was 32.4 ± 46.7 and 14.4 ± 13.8 g/m2, respectively. Despite the large differences between the two means, neither differed significantly between the two locations. The density and the wet weight of P. pisidium were each compared among the four areas: area facing the open ocean, area within an enclosed inlet, river mouth area and tidal flat area. Both were highest in the Z. japonica beds in the area facing the open ocean and lowest in the bare sandy bottom in the area within enclosed inlet. The mean shell length of P. pisidium was highest in the area facing the open ocean and lowest in the river mouth area. The density and the wet weight of P. pisidium were each both negatively correlated with the total organic carbon (TOC) and the silt-clay content in the sediment. These results show that P. pisidium is densely distributed in the intertidal zone, especially in Z. japonica beds, with low TOC and silt-clay contents. In conclusion, Z. japonica beds presumably play an important role in providing suitable habitats for P. pisidium.

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