Taxonomic and functional diversity change is scale dependent.
Taxonomic and functional diversity change is scale dependent.
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DOI：
10.1038/s41467-018-04889-z
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发表时间：
2018-07-02
影响因子：
16.6
通讯作者：
Jetz W
中科院分区：
文献类型：
--
作者：
Jarzyna MA;Jetz W
对近期生物多样性变化的估计仍然不一致，存在争议，而且很少对其功能影响进行评估。在此，我们报告了空间尺度和生物多样性测量类型对时间生物多样性变化的影响证据。通过对近50年的北美种鸟调查记录和全球灭绝记录，我们发现鸟类分类（TD）和功能（FD）多样性的时间趋势普遍存在尺度依赖性。除全球范围外，其他地区的平均总输水量和总输水量均有所增加。在大尺度上，TD的变化超过FD的变化，表明功能恢复。随着规模的扩大，群落间的时间差异和更替（物种或功能的替代）减少，而巢性（群落间互为子集的趋势）增加。FD变化模式在饮食和觅食行会之间差异很大。我们建议，监测、政策和保护需要一个明确的尺度框架来解释尺度对感知到的生物多样性变化的普遍影响。生物多样性变化的证据和影响仍然存在广泛的争论。Jarzyna和Jetz展示了鸟类分类和功能多样性的强烈和不同的尺度依赖性，突出了尺度在评估生物多样性变化时的重要性。
Estimates of recent biodiversity change remain inconsistent, debated, and infrequently assessed for their functional implications. Here, we report that spatial scale and type of biodiversity measurement influence evidence of temporal biodiversity change. We show a pervasive scale dependence of temporal trends in taxonomic (TD) and functional (FD) diversity for an ~50-year record of avian assemblages from North American Breeding Bird Survey and a record of global extinctions. Average TD and FD increased at all but the global scale. Change in TD exceeded change in FD toward large scales, signaling functional resilience. Assemblage temporal dissimilarity and turnover (replacement of species or functions) declined, while nestedness (tendency of assemblages to be subsets of one another) increased with scale. Patterns of FD change varied strongly among diet and foraging guilds. We suggest that monitoring, policy, and conservation require a scale-explicit framework to account for the pervasive effect that scale has on perceived biodiversity change. The evidence for and implications of biodiversity change remain widely debated. Jarzyna and Jetz demonstrate a strong and varying scale dependence of avian taxonomic and functional diversity, highlighting the importance of scale when assessing biodiversity change.