Tempo and mode of mandibular shape and size evolution reveal mixed support for incumbency effects in two clades of island‐endemic rodents (Muridae: Murinae)*
Tempo and mode of mandibular shape and size evolution reveal mixed support for incumbency effects in two clades of island‐endemic rodents (Muridae: Murinae)*
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下颌形状和大小进化的节奏和模式揭示了对岛屿特有啮齿动物（鼠科：鼠亚科）两个进化枝的在位效应的混合支持*
DOI：
10.1111/evo.13737
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发表时间：
2019
期刊：
影响因子：
3.3
通讯作者：
Jansa, Sharon A.
中科院分区：
文献类型：
--
作者：
Rowsey, Dakota M.;Heaney, Lawrence R.;Jansa, Sharon A.
现有的辐射在空间有限的系统，如海洋岛屿可能会限制生态的机会，经历了后来的殖民者，导致较低的宏观进化率二次辐射。此外，潜在的殖民者可能会被这些现任（居民）物种竞争性地排除在外，除非它们在生物学上是不同的（生物过滤）。现存的次级殖民者的表型多样性，因此可能会受到较低的表型进化率，排除某些表型，并过渡到新的形态型，以逃避竞争现任血统。我们使用几何形态测量的方法来测试是否吕宋岛的“老地方”啮齿动物分支，Phloeomyini和Chromomyini的下颌骨进化的速度和模式，与这些预测是一致的。每个分支占据几乎完全分离的形状空间和部分分离的大小空间。我们检测到有限的支持减速和分支特定的进化速率的形状和大小，与强有力的证据，在Chromomyini内的进化模式的转变。我们的研究结果表明，减速的表型进化速率不是在职相互作用的必然结果;相反，在职效应可能更有可能决定哪些分支可以在系统中建立。通过生物过滤器的非现任分支可能会表现出相对不受约束的进化。
Existing radiations in a spatially limited system such as an oceanic island may limit the ecological opportunity experienced by later colonists, resulting in lower macroevolutionary rates for secondary radiations. Additionally, potential colonists may be competitively excluded by these incumbent (resident) species, unless they are biologically distinct (biotic filtering). The extant phenotypic diversity of secondary colonists may thus be impacted by lower rates of phenotypic evolution, exclusion from certain phenotypes, and transitions to new morphotypes to escape competition from incumbent lineages. We used geometric morphometric methods to test whether the rates and patterns of mandibular evolution of the Luzon “old endemic” rodent clades, Phloeomyini and Chrotomyini, are consistent with these predictions. Each clade occupied nearly completely separate shape space and partially separate size space. We detected limited support for decelerating and clade-specific evolutionary rates for both shape and size, with strong evidence for a shift in evolutionary mode within Chrotomyini. Our results suggest that decelerating phenotypic evolutionary rates are not a necessary result of incumbency interactions; rather, incumbency effects may be more likely to determine which clades can become established in the system. Nonincumbent clades that pass a biotic filter can potentially exhibit relatively unfettered evolution.