Size Matters: Analyses of Benthic Foraminiferal Assemblages Across Differing Size Fractions
Size Matters: Analyses of Benthic Foraminiferal Assemblages Across Differing Size Fractions
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DOI：
10.3389/fmars.2019.00752
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发表时间：
2019-12
影响因子：
3.7
通讯作者：
Elena Lo Giudice Cappelli;W. Austin
中科院分区：
文献类型：
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作者：
Elena Lo Giudice Cappelli;W. Austin
底栖有孔虫组合是从（古）环境重建到生物监测的许多研究的对象;然而，建立一个程序来标准化这些研究仍然是最近的成就。并非所有基于底栖有孔虫组合的研究都采用相同的方法，这可能会妨碍使用和比较在制定标准规程之前或实际上在不了解标准规程的情况下制备的样本，主要问题之一是了解并尽可能量化不同粒级对有孔虫生物多样性和丰富性的影响。在这项研究中，我们分析了来自设得兰群岛（苏格兰）西海岸的底栖有孔虫组合，这些有孔虫组合是在没有遵循标准程序的情况下故意制备的，而是从63 - 150微米和> 150微米的粒度中挑选出来的。组合组成，生物多样性指数和多元分析的数据的基础上，我们评估的质量和精度的环境信息，可以从这些样本推断。我们发现，一般的生物多样性趋势保持不变，无论大小部分，而组合内部组成是显着不同的大小部分之间，与小部分保留更大程度的环境敏感性。我们建议汇编这两个样本集，以产生一个更全面和详细的环境变化的图片，并产生高分辨率的环境重建。尽管如此，我们的结论是，从大尺寸部分（> 150 µ m）中挑选的底栖有孔虫组合仍然提供了有关主要环境条件的有用信息，并且仍然有助于概述这些沿海环境的环境变化。
Benthic foraminiferal assemblages are the object of numerous studies spanning from (palaeo)environmental reconstructions to biomonitoring; however, the establishment of a procedure to standardize these studies remains a recent achievement. Not all studies based on benthic foraminiferal assemblages adopt the same methodology, which potentially hinders the use and comparison of samples prepared prior to the creation of a standard protocol or, indeed, without the knowledge of it. One of the main issues is to understand and possibly quantify the influence of different size fractions on foraminiferal biodiversity and richness. In this study, we analyzed benthic foraminiferal assemblages from the west coast of Shetland (Scotland), which were deliberately prepared without following the standard procedure, and were instead picked from the size fractions 63-150 m and > 150m. Based on assemblage composition, biodiversity indices and multivariate analyses of the data, we assessed the quality and precision of the environmental information that could be extrapolated from these samples. We found that general biodiversity trends remain the same regardless of size fraction, whereas the assemblage internal composition is significantly different between size fractions, with the small fraction retaining a greater degree of environmental sensitivity. We recommend compiling the two sample sets to produce a more holistic and detailed picture of environmental change and generate high-resolution environmental reconstructions. Nevertheless, we conclude that benthic foraminiferal assemblages picked from the large size fraction (> 150 µm) still provide useful information on prevailing environmental conditions and remain useful for an overview of environmental change in these coastal settings.