We evaluated the feasibility of using testate amoebae to infer the quantitative paleohydrology of ombrotrophic mires during their early stages (fen and fen-bog transition) of development. Two transfer functions, one derived from ombrotrophic and the other from minerotrophic mires, were applied to a peat core from an ombrotrophic mire in a taiga region of west Siberia. An ombrotrophic transfer function was applied to the bog stage of mire development. In contrast, ombrotrophic and minerotrophic transfer functions were applied independently to infer water table depth in the fen and fen-bog transition stages. Results of the two approaches for calculating water table depth during the fen and fen-bog transition stages differed by as much as 38 cm for the same peat sample. The main reason for this discrepancy is presence of testate amoeba taxa (e.g. Centropyxis aculeata, Cyclopyxis eurystoma, Cyclopyxis eurystoma v. parvula ) in the peat that inhabit both modern ombrotrophic and minerotrophic mires, but differ substantially, in cases by > 20 cm, in terms of their water table depth optima in the ombrotrophic and minerotrophic mire calibration data sets. This difference in inferred water table depth also stems, to a lesser degree, from the fact that the ombrotrophic mire model does not include taxa that inhabited exclusively minerotrophic mires in the fen and fen-bog transition stages. Given these findings, we propose that different models be used for different stages of development, to reconstruct past water table depth in ombrotrophic mires. We recommend use of a model based solely on the ombrotrophic mire data set for the bog stage, and application of a second model based on the minerotrophic mire data set, for the fen and fen-bog transition stages. Application of an ombrotrophic model to the early stages of bog development can yield erroneous paleohydrological reconstructions.

中文翻译：

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使用遗嘱变形虫来推断嗜盐沼泽发育的沼泽和沼泽过渡阶段的古水文

我们评估了使用遗嘱变形虫来推断嗜盐沼泽在其早期发展阶段（沼泽和沼泽过渡）定量古水文学的可行性。两个传递函数，一个来自于嗜盐沼泽，另一个来自嗜盐沼泽，被应用于来自西西伯利亚针叶林地区嗜盐沼泽的泥炭核心。向沼泽发展的沼泽阶段应用了嗜碱传递函数。相比之下，在 fen 和 fen-bog 过渡阶段，独立应用 ombrotrophic 和 minerotrophic 传递函数来推断地下水位深度。对于同一泥炭样品，在 fen 和 fen-bog 过渡阶段计算地下水位深度的两种方法的结果差异高达 38 cm。这种差异的主要原因是存在遗嘱变形虫类群（例如 Centropyxis aculeata, Cyclopyxis eurystoma, Cyclopyxis eurystoma v. parvula ) 在泥炭中同时栖息于现代嗜盐型和矿质型泥炭中，但在嗜碱性和嗜矿型校准中的地下水位深度最佳值方面差异很大，在> 20 cm 的情况下数据集。推断地下水位深度的这种差异在较小程度上也源于这样一个事实，即嗜盐沼泽模型不包括在沼泽和沼泽过渡阶段仅栖息于矿营养沼泽的分类群。鉴于这些发现，我们建议对不同的开发阶段使用不同的模型，以重建嗜盐沼泽中过去的地下水位深度。我们建议使用仅基于沼泽阶段的 ombrotrophic 泥沼数据集的模型，以及基于矿质营养沼泽数据集的第二个模型的应用，用于 fen 和 fen-bog 过渡阶段。在沼泽发育的早期阶段应用 ombrotrophic 模型可能会产生错误的古水文重建。