底生有孔虫と重金属汚染への対応．中国遼東湾の事例

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Mar. Pollut. Bull..2020 May;154:111084. S0025-326X(20)30202-2. doi: 10.1016/j.marpolbul.2020.111084.Epub 2020-03-27.

底生有孔虫と重金属汚染への対応．中国遼東湾の事例

Benthic foraminifera and its response to heavy metal pollution: A case study from Liaodong Bay, China.

Yeda Guo
Xi Mei
Xiangjun Meng
Xianhong Lan
Huijun Chen
Hao Yang

PMID: 32319914 DOI: 10.1016/j.marpolbul.2020.111084.

抄録

底生有孔虫は環境生物指標として利用でき，特に汚染環境下では汚染物質に対する感受性が変化している可能性がある．遼東湾の189の表層堆積物サンプルの定性・定量分析に基づき、40属76種の底生有孔虫を確認した。32種の底生有孔虫についてQモード因子分析を行い，3つの群集が認められた．Ammonia aomoriensis- Cribroelphidium magellanicum- Protelphidium tuberculatum; Textularia foliacea- Polskiammina asiatica; Rotalidium annectens- Buccella frigidaの3種の底生有孔虫群集が確認された。重金属元素が底生有孔虫類相に及ぼす影響を調べるために、全表層堆積物サンプルで7種類の重金属元素を分析した結果、遼東湾の重金属元素は主に金州港に分布しており、全体的な特徴は北西部で高く、南東部で低いことがわかった。有孔虫と重金属元素の分布を見ると、両者には有意な相関関係があることが明らかになった。Cribroelphidium magellanicumとProtelphidium tuberculatumは重金属濃縮地域で高いレベルを維持しており、遼東湾沿岸の重金属汚染の指標となる可能性がある。

Benthic foraminifera can be used as an environmental bioindicator, especially in the polluted environment where their sensitivity to pollutants may be expressed by a modification in the assemblage. Based on the quantitative and qualitative analysis of 189 surface sediment samples in Liaodong Bay, 76 benthic foraminifera species which belong to 40 genera were recognized. Q-mode factor analysis was made for the 32 benthic foraminifera species, and three assemblages are recognized: Ammonia aomoriensis- Cribroelphidium magellanicum- Protelphidium tuberculatum; Textularia foliacea- Polskiammina asiatica; and Rotalidium annectens- Buccella frigida. To study the effects of heavy metal elements on benthic foraminifera fauna, seven heavy metals elements have been analyzed in all the surface sediment samples, the results show that the heavy metal elements in Liaodong Bay are mainly distributed in Jinzhou Port, and that the overall characteristics are high in northwest and low in southeast. The distribution of foraminifera and heavy metals elements reveals that there is a significant correlation between them. Cribroelphidium magellanicum and Protelphidium tuberculatum have maintained a high level in heavy metal enrichment areas, and may be used as an indicator of heavy metal contamination along the coast of Liaodong Bay.