Re-evaluating the importance of threatened species in maintaining global phytoregions.

Re-evaluating the importance of threatened species in maintaining global phytoregions.
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重新评估受威胁物种在维护全球植物区中的重要性。

DOI:
10.1111/nph.19295
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发表时间:
2023
期刊:
The New phytologist
影响因子:
--
通讯作者:
Brown MJM
Brown MJM
中科院分区:
--
文献类型:
--
作者:
Brown MJM

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众所周知,人为引入正在改变全球植物地理区(植物区)的结构,但以前的研究受到不完整或严重偏见的数据集的限制,这些数据集可能会低估受威胁物种的重要性。在这项工作中,我们分析了所有已知物种及其出现(在植物学国家分辨率)的综合数据集,以量化未来潜在灭绝情景的影响。我们使用基于网络的群落检测算法Infomap来生成六种物种分布情景(记录为受威胁或可能受到威胁的物种的本地、引入和灭绝,以及它们的组合)的植物区域划分。我们比较了植物区的数量和大小,以描述在每种情况下全球植物区变化的数量和空间分布。预测受到威胁的物种的灭绝对植物区的同质化效应比引入对植物区的同质化作用更大,而且有一些证据表明,引种甚至可能缓解物种灭绝引起的同质化,尽管这种相互作用是复杂的。这项研究首次提供了证据,表明受威胁物种的丧失将对全球植物区产生重大影响,并证明在研究人类活动对生物多样性格局的影响时需要考虑灭绝过程。
Anthropogenic introductions are known to be changing the structure of global phytogeographical regions (phytoregions), but previous studies have been limited by incomplete or biased data sets that are likely to underestimate the importance of threatened species. In this work, we analyse a comprehensive data set of all known species and their occurrences (at botanical country resolution) to quantify the impact of potential future extinction scenarios.We used Infomap, a network‐based community detection algorithm, to generate phytoregional delineations for six species‐distribution scenarios (native, introduced and extinctions of species that are either documented as threatened or likely to be threatened, as well as combinations thereof). We compared the numbers and sizes of phytoregions to characterise the amount and spatial distribution of changes in global phytoregions under each scenario.Extinctions of species that are predicted to be threatened had a greater homogenising effect on phytoregions than introductions, and there was some evidence that introductions may even mitigate the homogenisation caused by extinctions, though this interaction is complex.This research provides the first evidence that the loss of threatened species would have significant ramifications for global phytoregions and demonstrates the need to consider extinction processes in studies of anthropogenic effects on biodiversity patterns.
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