New evidence for coiling direction of benthic foraminifera as a temperature proxy
New evidence for coiling direction of benthic foraminifera as a temperature proxy
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DOI：
10.3389/fmars.2023.1122189
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Shuaishuai Dong;Y. Lei;Tianzhen Wu;Meng Li
中科院分区：
文献类型：
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作者：
Shuaishuai Dong;Y. Lei;Tianzhen Wu;Meng Li
有孔虫对气候变化十分敏感，其种类组成、壳体化学元素组成和形态特征是有用的古环境指标。盘绕方向是锥螺旋有孔虫的一个独特而易识别的形态特征，并已被用于古海洋学重建。在黄海低潮带进行了为期13个月的野外调查，并在3种温度和4种盐度条件下进行了底栖有孔虫的培养试验，以探讨底栖有孔虫卷曲方向与环境因子的关系。结果表明，青森氨虫（Ammoniumaomoriensis，Asano，1951）在高温条件下喜向左侧活动，对盐度无偏好。统计分析表明，A.青森藻与温度呈显著正相关（野外调查r = 0.5017，p = 0.0011;养殖试验r = 0.5117，p = 0.0014），与盐度相关不显著（p > 0.05）。左旋/右旋比值与A丰度呈显著负相关。左/右比值与大小呈显著正相关（P <0.05）。这是首次结合野外调查和培养实验对底栖有孔虫的盘绕方向进行研究。我们的研究结果表明，A.青森虫可以用来指示温度的变化。该研究为螺旋方向作为温度代用指标的可靠性提供了新的证据，并使我们重新思考形态变化在生物适应和进化中的意义。
Foraminifera are sensitive to climate change and their species composition, shell chemical element composition and morphological characteristics are useful paleoenvironmental proxies. Coiling direction is a distinctive and easily identifiable morphological feature in trochospiral foraminifera and has been used for paleoceanographic reconstruction. Here, we conducted a field survey in a low intertidal zone in Yellow Sea for 13 months and performed a culture experiment under three temperatures and four salinities for the benthic foraminifera to seek the relationship between coiling direction and environmental factors. Our results showed that the dominant benthic foraminifera Ammonia aomoriensis (Asano, 1951) preferred sinistral direction under high temperature and had no preference with salinity. Statistical analysis showed that the ratio of sinistral/dextral in A. aomoriensis was significantly positively correlated with temperature (r = 0.5017, p = 0.0011 for field survey and r = 0.5117, p = 0.0014 for culture experiment), but had no evident relationship with salinity (p > 0.05). The ratio of sinistral/dextral was significantly negatively related with the abundance of A. aomoriensis (p < 0.05) and the ratio of sinistral/dextral was significantly positively related with the size (p < 0.05). This was the first study on the coiling direction of benthic foraminifera combining the field survey and culture experiment. Our findings suggested that the ratio of sinistral/dextral in A. aomoriensis could be used to indicate the change of temperature. This study offered new evidence for the reliability of the coiling direction as a temperature proxy and made us rethink the significance of the morphological change in biological adaptation and evolution.