Testate amoebae as a proxy for reconstructing Holocene water table dynamics in southern Patagonian peat bogs

Testate amoebae as a proxy for reconstructing Holocene water table dynamics in southern Patagonian peat bogs
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将变形虫作为重建巴塔哥尼亚南部泥炭沼泽全新世地下水位动态的代理

DOI:
10.1002/jqs.2719
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发表时间:
2014
影响因子:
2.3
通讯作者:
VAN BELLEN S
VAN BELLEN S
中科院分区:
地球科学3区
文献类型:
--
作者:
VAN BELLEN S

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遗存变形虫在泥沼中数量丰富,种类繁多,被广泛用作过去地下水位的指示物。尽管这些单细胞原生生物分布广泛,具有全球相似的水文偏好,但群落的区域差异需要区域特定的传递函数。本文基于2012年和2013年从5个沼泽样带中获得的154个表面样本,提出了南巴塔哥尼亚沼泽的第一个传递函数。pH值、电导率,特别是地下水位深度可以解释显著的差异。地下水位的传递函数采用加权平均构建,并通过交叉验证和独立测试集进行评估。最优传递函数具有预测能力,但由于采样水位范围广,预测误差较大。独立测试集的使用,以及交叉验证,允许比大多数以前的研究更严格的模型性能评估。对于一部分地点,我们比较了地表和地下样本,以证明群落组成的显著差异,可能是由于垂直分区。我们的研究结果首次量化了几种稀有物种(可能包括南半球特有物种)的水文最佳值和耐受性,并为巴塔哥尼亚南部沼泽的古水文重建铺平了道路。
Testate amoebae are abundant and diverse inSphagnumpeat bogs and have been used extensively as indicators of past water table depths. Although these unicellular protists are widely dispersed with globally similar hydrological preferences, regional variations in communities demand region‐specific transfer functions. Here we present the first transfer function for southern Patagonian bogs, based on 154 surface samples obtained from transects in five bogs sampled in 2012 and 2013. Significant variance was explained by pH, electrical conductivity and, in particular, water table depth. Transfer functions for water table were constructed using weighted averaging and evaluated by cross‐validation and independent test sets. The optimal transfer function has predictive ability, but relatively high prediction errors given the wide range in sampled water tables. The use of independent test sets, as well as cross‐validation, allows a more rigorous assessment of model performance than most previous studies. For a subset of locations we compare surface and subsurface samples to demonstrate significant differences in community composition, possibly due to vertical zonation. Our results provide the first quantification of hydrological optima and tolerances for several rare species, which may include Southern Hemisphere endemics and pave the way for palaeohydrological reconstructions in southern Patagonian bogs.
希腊北部埃拉蒂亚泥沼中有睾丸变形虫的垂直分层:湿地对近期气候变化或自生过程做出反应的古生态学证据?
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