An alternative approach to transfer functions? Testing the performance of a functional trait-based model for testate amoebae
An alternative approach to transfer functions? Testing the performance of a functional trait-based model for testate amoebae
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DOI：
10.1016/j.palaeo.2016.12.005
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发表时间：
2017-02
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通讯作者：
S. Bellen;D. Mauquoy;R. Payne;T. Roland;P. Hughes;T. Daley;N. Loader;F. Street-Perrott;Emma M. Rice;V. Pancotto
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作者：
S. Bellen;D. Mauquoy;R. Payne;T. Roland;P. Hughes;T. Daley;N. Loader;F. Street-Perrott;Emma M. Rice;V. Pancotto
传递函数现在被广泛用于从生物组合推断过去的环境条件。现有的传递函数是基于物种组合，但另一种选择是表征组合的基础上的功能性状，生物体的特点，决定其健身和性能。本文以南美火地岛泥炭地43个类群为研究对象，通过对7个与泥炭含水量相关的功能性状进行聚类分析，验证了基于性状传递函数的泥炭地地下水位深度重建方法的可行性。传递函数的基础上（多）线性回归和偏最小二乘，验证使用交叉验证和一个独立的测试集，并适用于三个核心记录。基于特征的模型表现得非常好。基于交叉验证和独立测试集的模型性能仅略弱于基于物种的模型，重建的核心趋势非常相似。基于特征的模型提供了相当大的潜力，特别是在没有类似的情况下，没有物种转移函数是没有经验的分析师的古生态重建。该方法值得对有遗嘱的变形虫和其他微体化石群进行进一步验证和测试。
Transfer functions are now widely available to infer past environmental conditions from biotic assemblages. Existing transfer functions are based on species assemblages but an alternative is to characterize assemblages based on functional traits, characteristics of the organism which determine its fitness and performance. Here, we test the potential of trait-based transfer functions using testate amoeba functional traits to reconstruct peatland water-table depths.A total of seven functional traits with linkages to peat moisture content were identified and quantified as community weighted-means for each of 43 taxa in a training set from Tierra del Fuego, South America. Transfer functions based on (multiple) linear regression and partial least-squares were produced, validated using cross-validation and an independent test set, and applied to three core records. Trait-based models performed remarkably well. Model performance based on cross-validation and an independent test set was only marginally weaker than for models based on species and reconstructed down-core trends were extremely similar. Trait-based models offer considerable potential for paleoecological reconstruction particularly in no-analogue situations, where no species transfer function is available and for inexperienced analysts. The approach deserves further validation and testing for both testate amoebae and other groups of microfossils.