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首页> 外文期刊>Journal of foraminiferal research >Distribution of testate amoebae in salt marshes along the North American East Coast
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Distribution of testate amoebae in salt marshes along the North American East Coast

机译：北美东海岸盐沼中的睾丸变形虫分布

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摘要

This study describes the distribution of testate amoebae in three North American East Coast salt marshes (Leipsic River marsh, Delaware, USA; Little River marsh, Maine, USA; and Little Dipper Harbour marsh, New Brunswick, Canada). Five zones are recognized in the high salt marsh. With increasing marine influence, these zones are characterized by the following succession of dominant taxa: Valkanovia elegans, Tracheleuglypha dentata, Centropyxis cassis type, C. platystoma type and Difflugia pristis type. Most species occur in all three marshes, and their general vertical distribution is comparable. The results are also comparable with those obtained from British salt marshes, suggesting that salt-marsh testate amoebae have similar distributions on both sides of the Atlantic Ocean. The precision of the sea-level indicative value of testate amoebae in fossil salt-marsh sediments is a function of the local mean tidal range (MTR). Results of this study show that testate amoebae can indicate former sea levels with a precision of +/- 0.04 m in the Leipsic River marsh (MTR = 1.75 m), +/- 0.09 m in the Little River marsh (MTR = 2.6 m), and +/- 0.18 m in the Little Dipper marsh (MTR = 5.8 m).
机译：这项研究描述了在三个北美东海岸盐沼（美国特拉华州的莱比锡河沼泽;美国缅因州的小河沼泽;以及加拿大的新不伦瑞克的小北斗港沼泽）中的睾丸变形虫的分布。高盐沼中有五个区域。随着海洋影响的增加，这些区域的特征是以下主要的分类单元：Valkanovia elegans，Tracheruglypha dentata，Centropyxis cassis类型，C。platystoma类型和Difflugia pristis类型。大多数物种都出现在这三个沼泽中，它们的总体垂直分布具有可比性。结果也与从英国盐沼获得的结果相当，这表明盐沼的睾丸变形虫在大西洋两岸都有相似的分布。化石盐沼沉积物中睾丸变形虫的海平面指示值的精确度是当地平均潮汐范围（MTR）的函数。这项研究的结果表明，遗嘱性变形虫可以指示前海平面，其精度在莱普西奇河沼泽（MTR = 1.75 m）中，+ /-0.04 m，在小河沼泽（MTR = 2.6 m）中，+/- 0.09 m ，和在北斗七星沼泽中的+/- 0.18 m（MTR = 5.8 m）。

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