Dietary morphology of two island-endemic murid rodent clades is consistent with persistent, incumbent-imposed competitive interactions

Dietary morphology of two island-endemic murid rodent clades is consistent with persistent, incumbent-imposed competitive interactions
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两个岛屿特有的鼠科啮齿动物进化枝的饮食形态与持续的、现有的竞争性相互作用一致

DOI:
10.1098/rspb.2019.2746
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发表时间:
2020
期刊:
Proceedings of the Royal Society B: Biological Sciences
影响因子:
--
通讯作者:
Jansa, Sharon A.
Jansa, Sharon A.
中科院分区:
--
文献类型:
--
作者:
Rowsey, Dakota M.;Keenan, Ryan M.;Jansa, Sharon A.

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一个没有竞争对手的地理区域的血统殖民可能会表现出快速多样化,由于更大的生态机会。由此产生的物种多样性,这一主要殖民(现任)分支可能会限制随后的谱系的持续能力,除非这些非现任谱系生态独特。我们比较了饮食相关的下颌骨形态的多样性,两个同域的鼠啮齿类动物特有的吕宋岛,菲律宾现任Phloeomyini和二次殖民Chromomyini的下颌骨形态多样性的Sahul Hydromyini,Chromomyini的姐妹分支和现任鼠血统的超大陆Sahul。这三个分支的比较,使我们能够测试的假设,现任血统可以强制持久的生态区分随后的殖民者在殖民化的时间,并在随后的历史上的两个同域分支。我们发现,Chromomyini形式的多样性的分支加上Sahul Hydromyini,最大限度地减少重叠与Phloeomyini的一个子集。我们还推断,这种分化延伸到干的祖先Chromomyini和Sahul Hydromyini,一致的生物过滤器所施加的Phloeomyini。我们的工作表明,在职有可能产生深远的影响,在岛屿规模的殖民谱系的生态形态多样性,即使有关的性状是独立殖民分支之间以类似的速度发展。
A lineage colonizing a geographic region with no competitors may exhibit rapid diversification due to greater ecological opportunity. The resultant species diversity of this primary-colonizing (incumbent) clade may limit subsequent lineages' ability to persist unless these non-incumbent lineages are ecologically distinct. We compare the diversity in diet-related mandibular morphology of two sympatric murid rodent clades endemic to Luzon Island, Philippines—incumbent Phloeomyini and secondary-colonizing Chrotomyini—to the mandibular morphological diversity of Sahul Hydromyini, the sister clade of Chrotomyini and the incumbent murid lineage on the supercontinent of Sahul. This three-clade comparison allows us to test the hypothesis that incumbent lineages can force persistent ecological distinction of subsequent colonists at the time of colonization and throughout the subsequent history of the two sympatric clades. We find that Chrotomyini forms a subset of the diversity of their clade plus Sahul Hydromyini that minimizes overlap with Phloeomyini. We also infer that this differentiation extends to the stem ancestor of Chrotomyini and Sahul Hydromyini, consistent with a biotic filter imposed by Phloeomyini. Our work illustrates that incumbency has the potential to have a profound influence on the ecomorphological diversity of colonizing lineages at the island scale even when the traits in question are evolving at similar rates among independently colonizing clades.
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