The comparative biogeography of Philippine geckos challenges predictions from a paradigm of climate-driven vicariant diversification across an island archipelago

A primary goal of biogeography is to understand how large-scale environmental processes, like climate change, affect diversification. One often-invoked but seldom tested process is the so-called ''species-pump'' model, in which repeated bouts of co-speciation is driven by oscillating climate-induced habitat connectivity cycles. For example, over the past three million years, the landscape of the Philippine Islands has repeatedly coalesced and fragmented due to sea-level changes associated with the glacial cycles. This repeated climate-driven vicariance has been proposed as a model of speciation across evolutionary lineages codistributed throughout the islands. This model predicts speciation times that are temporally clustered around the times when interglacial rises in sea level fragmented the islands. Given the significance and conceptual impact the model has shown, surprisingly few tests of this prediction have been provided. We collected comparative genomic data from 16 pairs of insu...

生物地理学（biogeography）的核心目标之一，是阐明气候变化等大规模环境过程如何影响物种多样化。一类被频繁援引却极少得到实证检验的过程，即所谓的"物种泵"（species-pump）模型：该模型提出，反复发生的共物种形成（co-speciation）事件由气候振荡驱动的栖息地连通性循环所驱动。例如，在过去300万年中，受冰期循环（glacial cycles）相关的海平面变化影响，菲律宾群岛的地表景观曾反复发生合并与破碎化。这种由气候驱动的反复地理分隔现象，被提议为群岛内共同分布的各演化谱系的物种形成模型。该模型预测，物种形成时间会在时间上聚集于间冰期海平面上升导致群岛破碎化的时段。鉴于该模型具备重要的学术意义与概念影响力，却鲜有研究对这一预测展开实证检验。本研究收集了16对岛屿……的比较基因组数据。