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Does foraminiferal test size reflect changes in palaeoenvironmental conditions?—a case study from the southern Svalbard shelf
Polar Research ( IF 1.9 ) Pub Date : 2020-06-18 , DOI: 10.33265/polar.v39.3624
Maciej M. Telesiński , Natalia Szymańska , Joanna Pawłowska , Marek Zajączkowski

Although the environmental factors influencing the growth rate and reproduction of benthic foraminifera are known, the relationship between foraminifera test size and environmental variables remains unclear, especially on geological timescales. In this article, we present two records of benthic foraminiferal test size over the last 14 000 years from the southern Svalbard shelf. We use statistical correlation to relate test size changes with environmental conditions recorded by other proxies, including benthic δ18O and δ13C, foraminiferal flux and abundance, and relative abundances of different ecologically indicative foraminiferal groups. The general trends in test size were relatively consistent between the two cores. Still, we found that none of the analysed proxies was statistically correlated with the test size in both records. This leads to a conclusion that foraminifera size is primarily impacted by local oceanographic conditions. These local conditions are partly influenced by global oceanographic transitions. Therefore, large-scale changes can have a secondary impact on foraminiferal test size. The analysis of test size correlation between species similarly revealed that not all species react consistently to environmental changes. Our results indicate that foraminiferal test size cannot be used as a universal and straightforward proxy, but in combination with other methods it can yield valuable palaeoenvironmental information.

中文翻译:

有孔虫试验规模是否反映了古环境条件的变化?——来自斯瓦尔巴群岛南部大陆架的案例研究

尽管影响底栖有孔虫生长速度和繁殖的环境因素是已知的,但有孔虫试验规模与环境变量之间的关系仍不清楚,尤其是在地质时间尺度上。在本文中,我们提供了过去 14 000 年间斯瓦尔巴群岛南部大陆架底栖有孔虫试验规模的两个记录。我们使用统计相关性将测试大小的变化与其他代理记录的环境条件相关联,包括底栖 δ18O 和 δ13C、有孔虫通量和丰度,以及不同生态指示有孔虫类群的相对丰度。两个核心之间测试规模的总体趋势相对一致。尽管如此,我们发现所分析的代理都没有与两个记录中的测试大小在统计上相关。这得出的结论是有孔虫的大小主要受当地海洋条件的影响。这些局部条件部分受到全球海洋学转变的影响。因此,大规模的变化会对有孔虫的测试大小产生次要影响。物种之间测试大小相关性的分析同样表明,并非所有物种对环境变化的反应都是一致的。我们的结果表明,有孔虫的测试大小不能用作通用和直接的代理,但与其他方法相结合,它可以产生有价值的古环境信息。大规模的变化会对有孔虫的测试大小产生次要影响。物种之间测试大小相关性的分析同样表明,并非所有物种对环境变化的反应都是一致的。我们的结果表明,有孔虫的测试大小不能用作通用和直接的代理,但与其他方法相结合,它可以产生有价值的古环境信息。大规模的变化会对有孔虫的测试大小产生次要影响。物种之间测试大小相关性的分析同样表明,并非所有物种对环境变化的反应都是一致的。我们的结果表明,有孔虫的测试大小不能用作通用和直接的代理,但与其他方法相结合,它可以产生有价值的古环境信息。
更新日期:2020-06-18
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