Benthic foraminiferal assemblages and test accumulation in coastal microhabitats on San Salvador, Bahamas

Benthic foraminiferal assemblages and test accumulation in coastal microhabitats on San Salvador, Bahamas
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巴哈马圣萨尔瓦多沿海微生境的底栖有孔虫组合和测试积累

DOI：
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发表时间：
2018
期刊：
Journal of Micropalaeontology
影响因子：
2
通讯作者：
Bent Vad Odgaard
Bent Vad Odgaard
中科院分区：
地球科学4区
文献类型：
--
作者：
A. Fischel;M. Seidenkrantz;Bent Vad Odgaard

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抽象的。在圣萨尔瓦多的一个浅水湾研究了底栖有孔虫种群。 巴哈马群岛的小岛。采集了表层沉积物和海洋大型植物。 从格雷厄姆斯港500 m样带沿线的14个样本站点到 调查每个小生境中的有孔虫组合，并测试 死亡有孔虫测试堆积模式与活体之间的联系 附生和沉积有孔虫组合，大型植物分布， 和环境梯度。这些分析包括粒度测量， 水生植物生物量的定量化、定性和定量 标题底栖有孔虫的研究。发现的附着于 不同的水生植物栖息地不同。然而，一种相关性 在这些活着的群落和沉积物中的死亡集合体之间 没有观察到相同的位置。主成分分析(PCA)和 冗余分析(RDA)表明，大型藻类的存在 Halimeda解释了16 %的死者残存动物变异 按下落速度分选后的有孔虫组合 是 分崩离析。RDA还反映了两国之间的正相关性 直径大于1 mm的有孔虫和0.2 5~0.5 mm的沉积物 粒度，表明沉积作用是主要因素 控制沉积附生有孔虫组合。这些 沉积过程叠加了大部分生态特征或 大型植物特有的联结。
Abstract. Benthic foraminiferal populations were studied in a shallow bay of San Salvador Island, the Bahamas. Surface sediments and marine macrophytes were collected from 14 sample sites along a 500 m transect at Grahams Harbour to investigate the foraminiferal assemblage in each microhabitat and to test the link between dead foraminiferal test accumulation patterns and living epiphytic and sedimentary foraminiferal assemblages, macrophyte distribution, and environmental gradients. The analyses include grain size measurements, macrophyte biomass quantification, and qualitative and quantitative studies of benthic foraminifera. The foraminifera found attached to macrophytes differed between macrophyte habitats. However, a correlation between these living communities and the dead assemblages in the sediments at the same sites could not be observed. Principal component analysis (PCA) and redundancy analysis (RDA) suggest that the presence of the macroalgae Halimeda explains 16 % of the residual faunal variation in the dead foraminiferal assemblage after the effects of sorting according to fall speed are partialled out. The RDA also reflects a positive correlation between foraminifera larger than 1.0 mm in diameter and the 0.25–0.5 mm sediment grain size, indicating sedimentological processes as the main factor controlling the sedimentary epiphytic foraminiferal assemblages. These sedimentary processes overprint most effects of ecological features or macrophyte-specific association.