Using phylogenetic diversity to identify ancient rain forest refugia and diversification zones in a biodiversity hotspot
Using phylogenetic diversity to identify ancient rain forest refugia and diversification zones in a biodiversity hotspot
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DOI：
10.1111/ddi.12266
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发表时间：
2015-03-01
影响因子：
4.6
通讯作者：
Crayn, Darren M.
中科院分区：
文献类型：
--
作者：
Costion, Craig M.;Edwards, Will;Crayn, Darren M.
目的与世界生物多样性热点的困境并行的是一场关于如何最好地优先考虑或最大限度地增加生物多样性以进行保护的辩论。迄今为止的方法侧重于量化物种、栖息地、系统发育或其他类型的多样性。保留进化独特性或系统发育多样性(PD)的重要性越来越受到人们的欢迎，因为它能够识别景观中的进化模式，这是传统的分类群丰富度衡量标准所不能做到的。在这里，我们扩展了PD作为生物多样性指数的应用，并结合历史生物地理数据来了解形成热带植物区系集合的过程。位置澳大利亚昆士兰热带东北部。方法我们为生物区生成了属水平的分子系统发育图来计算PD。然后，我们将历史生物地理数据整合到一个模型中，以解释PD和PD残留物的分布，并进一步检验热带雨林随时间的稳定性与群落群落之间的相关性。结果我们发现PD残留物与现存植物区系中谱系的生物地理起源之间存在很强的相关性。根据属属丰富度(GR)计算，PD高于预期的地区包含较高比例的移民植物谱系，这些植物谱系在过去数百万年内主要从东南亚散布到澳大利亚北部。PD低于属丰富度预测的地区具有丰富的古代澳大利亚遗迹谱系，并与先前发现的热带雨林避难所相关，这些避难所在上一次冰川周期中保持稳定。主要结论在没有历史解释的情况下，最大PD可能会产生意想不到的或不希望看到的保护结果，例如用较低的PD值剥夺古代避难所的地位。通过了解一个地区的生物群组合，可以做出更知情的决定，以确保一个地区进化历史的不同阶段得到保护。
AimThe plight of the world's biodiversity hotspots has been paralleled by a debate over how to best prioritize or maximize gain of biodiversity for conservation. Approaches to date have focused on quantifying species, habitat, phylogenetic or other types of diversity. The importance of preserving evolutionary distinctiveness or phylogenetic diversity (PD) has gained popularity due to its ability to identify evolutionary patterns in the landscape that traditional taxon richness measures cannot. Here, we expand upon the application of PD as a biodiversity index and incorporate data on historical biogeography to understand the processes that shaped the assembly of a tropical flora.LocationTropical north-east Queensland, Australia.MethodsWe generated a genus-level molecular phylogeny for the bioregion to calculate PD. We then integrated data on historical biogeography into a model to explain the distribution of PD and the PD residuals and further tested for a correlation between rain forest stability through time and community assembly.ResultsWe identified a strong correlation between PD residuals and the biogeographic origin of the lineages in the extant flora. Areas with higher PD than expected based on generic richness (GR) contain a higher proportion of immigrant plant lineages dispersed into northern Australia mostly from Southeast Asia within the past few million years. Areas with lower PD than predicted by genus richness are rich in ancient Australian relict lineages and are correlated with previously identified rain forest refugia that have remained stable throughout the last glacial cycle.Main conclusionsMaximizing PD without historical interpretation may yield unintended or undesirable conservation outcomes such as deprioritizing ancient refugia with lower PD values. By understanding the biome assembly of a region, better-informed decisions can be made to ensure different stages of a region's evolutionary history are preserved.