Mitogenomic evidence for an Indo-West Pacific origin of the Clupeoidei (Teleostei: Clupeiformes).
Mitogenomic evidence for an Indo-West Pacific origin of the Clupeoidei (Teleostei: Clupeiformes).
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DOI：
10.1371/journal.pone.0056485
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Nishida M
中科院分区：
文献类型：
--
作者：
Lavoué S;Miya M;Musikasinthorn P;Chen WJ;Nishida M
鲱鱼分布于世界各地，海洋、淡水和广盐物种生活在热带或温带环境中。区域特有现象在物种和属水平上很重要，在热带海洋印度-西太平洋地区发现了最高的物种多样性。鲽鱼的分布遵循物种丰富度的两种一般模式，即纵向梯度和纬向梯度。为了测试解释这两个梯度形成的历史假设，我们研究了Clupeoidei的早期生物地理学，重建了它们的栖息地偏好的演变以及它们在时间校准的线粒体基因组系统发育上的祖先范围分布。系统发育结果支持Clupeoidei内九个主要谱系的区别，其中五个是新谱系。我们推断在Clupeoidei最初的多样化时期之后发生了从海洋到淡水环境以及从热带到温带环境的几次独立转变。这些结果与我们的祖先范围重建假说相结合，表明白垩纪时期鲱鱼的可能起源和多样化区域是目前印度-西太平洋地区的热带海洋前身。因此，我们的研究倾向于“原产地”和“热带保守主义”假设来分别解释鲱鱼物种丰富度的纵向和纬度梯度的起源。额外的地质和古生物学证据进一步将热带海洋古区域的起源确定为东特提斯海区域。 Clupeoidei 的白垩纪化石记录与此处的结果部分不一致，因为它包含在该地区之外发现的类群。我们讨论了我们的生物地理学假说与白垩纪鲽鱼化石分布之间冲突的三个可能原因：区域灭绝、不完整的分类采样和不正确的时间尺度估计。
The clupeoid fishes are distributed worldwide, with marine, freshwater and euryhaline species living in either tropical or temperate environments. Regional endemism is important at the species and genus levels, and the highest species diversity is found in the tropical marine Indo-West Pacific region. The clupeoid distribution follows two general pattern of species richness, the longitudinal and latitudinal gradients. To test historical hypotheses explaining the formation of these two gradients, we have examined the early biogeography of the Clupeoidei in reconstructing the evolution of their habitat preferences along with their ancestral range distributions on a time-calibrated mitogenomic phylogeny. The phylogenetic results support the distinction of nine main lineages within the Clupeoidei, five of them new. We infer several independent transitions from a marine to freshwater environment and from a tropical to temperate environment that occurred after the initial diversification period of the Clupeoidei. These results combined with our ancestral range reconstruction hypothesis suggest that the probable region of origin and diversification of the Clupeoidei during the Cretaceous period was the tropical marine precursor to the present Indo-West Pacific region. Thus, our study favors the hypotheses of “Region of origin” and “Tropical conservatism” to explain the origins of the longitudinal and latitudinal gradients of clupeoid species richness, respectively. Additional geological and paleontological evidence further define the tropical marine paleo-region of origin as the eastern Tethys Sea region. The Cretaceous fossil record of the Clupeoidei is partially incongruent with the results here as it contains taxa found outside this region. We discuss three possible causes of conflict between our biogeographical hypothesis and the distributions of the Cretaceous clupeoid fossils: regional extinction, incomplete taxonomic sampling and incorrect timescale estimation.
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