Inferring the evolution of reproductive isolation in a lineage of fossil threespine stickleback, Gasterosteus doryssus.
Inferring the evolution of reproductive isolation in a lineage of fossil threespine stickleback, Gasterosteus doryssus.
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推断化石三刺鱼（Gasterosteus doryssus）谱系中生殖隔离的进化。
DOI：
10.1098/rspb.2024.0337
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发表时间：
2024
期刊：
影响因子：
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通讯作者：
Stuart,YoelE
中科院分区：
文献类型：
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作者：
Siddiqui,Raheyma;Swank,Samantha;Ozark,Allison;Joaquin,Franklin;Travis,MatthewP;McMahan,CalebD;Bell,MichaelA;Stuart,YoelE
达尔文将化石记录中物种转变的缺失归因于他的假设，即物种形成发生在地理上过于局限而无法被化石序列捕获的孤立栖息地斑块中。迈尔的周边物种形成模型补充说，这种物种形成将是迅速的，进一步解释了缺乏多样性的证据。事实上，埃尔德雷奇和古尔德最初的间断平衡模型结合了达尔文的猜想、迈尔的模型和124年来未能成功的化石记录转换采样。然而，观察到这种差异可以说明早期物种形成过程中的进化克里思和模式。在这里，我们调查的围域分歧在中新世棘鱼，Gasterosteus doryssus.This谱系出现，并在大约8000代，进化显着减少12的16个特征相关的盔甲，游泳和饮食，相对于其祖先的人口。这是更大的形态差异比我们观察到的生殖隔离，底栖湖沼生态型exterosteus aculeatus。因此，我们推测生殖隔离是进化的，但局部灭绝的G。doryssuslineages显示了年轻的、孤立的、物种形成的种群是如何经常消失的，支持了达尔文对证据缺失的解释，并揭示了形态停滞背后的机制。灭绝也可以解释有限的持续分歧内刺鱼物种复杂，并帮助协调物种形成率的变化，观察到跨时间尺度。
Darwin attributed the absence of species transitions in the fossil record to his hypothesis that speciation occurs within isolated habitat patches too geographically restricted to be captured by fossil sequences. Mayr's peripatric speciation model added that such speciation would be rapid, further explaining missing evidence of diversification. Indeed, Eldredge and Gould's original punctuated equilibrium model combined Darwin's conjecture, Mayr's model and 124 years of unsuccessfully sampling the fossil record for transitions. Observing such divergence, however, could illustrate the tempo and mode of evolution during early speciation. Here, we investigate peripatric divergence in a Miocene stickleback fish,Gasterosteus doryssus.This lineage appeared and, over approximately 8000 generations, evolved significant reduction of 12 of 16 traits related to armour, swimming and diet, relative to its ancestral population. This was greater morphological divergence than we observed between reproductively isolated, benthic-limnetic ecotypes of extantGasterosteus aculeatus. Therefore, we infer that reproductive isolation was evolving.However, local extinction ofG. doryssuslineages shows how young, isolated, speciating populations often disappear, supporting Darwin's explanation for missing evidence and revealing a mechanism behind morphological stasis. Extinction may also account for limited sustained divergence within the stickleback species complex and help reconcile speciation rate variation observed across time scales.