Towards a Holarctic synthesis of peatland testate amoeba ecology: Development of a new continental-scale palaeohydrological transfer function for North America and comparison to European data
Towards a Holarctic synthesis of peatland testate amoeba ecology: Development of a new continental-scale palaeohydrological transfer function for North America and comparison to European data
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DOI：
10.1016/j.quascirev.2018.10.034
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发表时间：
2018-12-01
影响因子：
4
通讯作者：
Warner, Barry G.
中科院分区：
文献类型：
--
作者：
Amesbury, Matthew J.;Booth, Robert K.;Warner, Barry G.
二十多年来，化石有遗嘱变形虫组合一直被用于重建泥炭地的古水文。虽然传递函数训练集通常是地方到区域规模的范围，结合这些数据，以涵盖广泛的生态水文梯度，从区域到大陆和半球的规模，是有用的，以评估物种的生态最佳条件是否在地理上不同，因此也可能随着时间的推移而变化。大陆尺度的传递函数也可以最大限度地提高现代模拟质量，而不会失去重建技能，提供了机会，了解纯粹的统计输出与更深入地了解生物体的地理。在这里，我们编译，在中等分类分辨率，近2000个现代表面泥炭地有遗嘱阿米巴样本从137泥炭地在整个北美的数据集。我们开发了四种模型类型的传递函数，对它们进行了统计测试，并将其应用于独立的古环境数据。通过将数据集细分为生态区域，我们研究了北美水文最优值和物种分布的地理模式。我们将新的数据集与欧洲的数据相结合，创建了一个组合传递函数。我们的北美传递函数的性能相当于已公布的模型和重建与使用区域训练集开发的那些。因此，新模型可以作为一个有效的工具，重建整个北美大陆泥炭地古水文。一些生态区的分类多样性较低，一些关键指示类群的分布范围有限。然而，这些模式发生在一般世界主义的背景下，在适度的分类分辨率使用。因此，在较高的分类分辨率下，可能的地理模式不会影响传递函数的性能。从北美和欧洲的组合模型的输出表明，任何地理限制的规模超过泥炭地有遗嘱的阿米巴数据的进一步汇编将是无效的尚未达到，因此倡导的泥炭地有遗嘱的阿米巴数据的全北极合成的潜力。由于热带和南半球的区域特有性较高，将数据合成扩展到这些地区将更具挑战性。(C)2018作者爱思唯尔有限公司出版
Fossil testate amoeba assemblages have been used to reconstruct peatland palaeohydrology for more than two decades. While transfer function training sets are typically of local-to regional-scale in extent, combining those data to cover broad ecohydrological gradients, from the regional-to continental- and hemispheric-scales, is useful to assess if ecological optima of species vary geographically and therefore may have also varied over time. Continental-scale transfer functions can also maximise modern analogue quality without losing reconstructive skill, providing the opportunity to contextualise understanding of purely statistical outputs with greater insight into the biogeography of organisms. Here, we compiled, at moderate taxonomic resolution, a dataset of nearly 2000 modern surface peatland testate amoeba samples from 137 peatlands throughout North America. We developed transfer functions using four model types, tested them statistically and applied them to independent palaeoenvironmental data. By subdividing the dataset into eco-regions, we examined biogeographical patterns of hydrological optima and species distribution across North America. We combined our new dataset with data from Europe to create a combined transfer function. The performance of our North-American transfer function was equivalent to published models and reconstructions were comparable to those developed using regional training sets. The new model can therefore be used as an effective tool to reconstruct peatland palaeohydrology throughout the North American continent. Some eco-regions exhibited lower taxonomic diversity and some key indicator taxa had restricted ranges. However, these patterns occurred against a background of general cosmopolitanism, at the moderate taxonomic resolution used. Likely biogeographical patterns at higher taxonomic resolution therefore do not affect transfer function performance. Output from the combined North American and European model suggested that any geographical limit of scale beyond which further compilation of peatland testate amoeba data would not be valid has not yet been reached, therefore advocating the potential for a Holarctic synthesis of peatland testate amoeba data. Extending data synthesis to the tropics and the Southern Hemisphere would be more challenging due to higher regional endemism in those areas. (C) 2018 The Authors. Published by Elsevier Ltd.