Functional redundancy (FR) is commonly invoked as one of the main mechanisms underlying ecological resilience. However, little is known about the extension of FR from single to multiple functions and its variation among ecological assemblages at biogeographic scales. We studied 51 assemblages of Eurasian small mammals (Mammalia: Rodentia and Mammalia: Soricomorpha), analyzing FR across and within assemblages. We quantified FR for trait sets related to five different functions: parasitic interactions, diet, habitat preferences, body mass and diel activity. We then evaluated the relationships between FR based on different functional trait sets across and within mammal assemblages, to determine whether small mammal assemblages and their species are redundant for single or multiple trait sets and thus, whether they are complementary or fully redundant when considering multiple functions. Further, we analyzed the influence of geography, climate, plant productivity and land use on FR. We found that FR based on mammal parasitic interactions, body mass and diel activity were positively correlated, whereas FR based on mammal body mass and habitat preferences were negatively related. These relationships were consistent across and within mammal assemblages. Additionally, FR mainly varied along geographic gradients (latitude and longitude). FR based on parasitic interactions, body mass and diel activity followed similar patterns, increasing at northern latitudes, possibly as a response to environmental filtering processes. FR for diet and habitat preferences increased at easterly longitudes, which may be due to landscape homogeneity in sites across central and eastern Asia. Despite redundancy across multiple functional trait sets, Eurasian small mammal assemblages were complementary when considering all five trait sets. Our results warn against conclusions drawn from the study of FR based on traits related to a single function.

中文翻译：

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评估欧亚小型哺乳动物组合中跨多个特征和生物地理范围的功能冗余

功能冗余（FR）通常被称为生态弹性的主要机制之一。但是，关于FR从单功能扩展到多功能以及在生物地理尺度上其在生态群落之间的变化知之甚少。我们研究了51种欧亚小哺乳动物的组合（哺乳动物：Rodentia和哺乳动物：Soricomorpha），分析了整个组合内和组合内的FR。我们对与五种不同功能相关的性状集的FR进行了量化：寄生相互作用，饮食，生境偏好，体重和diel活动。然后，我们根据跨哺乳动物组合的不同功能性状集评估了FR之间的关系，以确定小型哺乳动物组合及其物种对于单个或多个性状集是否多余，因此，在考虑多种功能时，它们是互补的还是完全冗余的。此外，我们分析了地理，气候，植物生产力和土地利用对FR的影响。我们发现基于哺乳动物寄生虫相互作用，体重和迪尔活动的FR呈正相关，而基于哺乳动物体重和栖息地偏好的FR呈负相关。这些关系在哺乳动物群体之间和内部都是一致的。此外，帧中继主要沿地理梯度（纬度和经度）变化。基于寄生相互作用，身体质量和diel活性的FR遵循相似的模式，在北纬增加，可能是对环境过滤过程的响应。饮食和生境偏好的FR在东经时增加，这可能是由于中亚和东亚各地区的景观同质化所致。尽管在多个功能性状集上有冗余，但在考虑所有五个性状集时，欧亚小哺乳动物组合是互补的。我们的结果对基于单一功能性状的FR研究得出的结论提出警告。