Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species
Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species
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近交抑制有助于维持密切相关的猴花物种之间的栖息地隔离
DOI：
10.1111/evo.14192
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发表时间：
2021
期刊：
影响因子：
3.3
通讯作者：
Lowry, David B.
中科院分区：
文献类型：
--
作者：
Toll, Katherine;LoPresti, Eric F.;Lowry, David B.
不完全生殖隔离的物种往往被隔离到不同的微生境中，即使它们能够在两种生境中生存和繁殖。长期的进化因素可能导致这种缺乏跨栖息地的持久性。当生殖干扰降低移民的适合度时，包括自花受精在内的替代性交配会增加移民在一代中的适合度，但从长远来看，近交衰退可能会降低种群持续存在的机会。两种加州猴花在同域分布区反复分离到干燥和湿润的地区。为了测试是否近交衰退可能有助于维持这种分离模式，我们移植远交和连续近交Mimulus guttatus和Mimulus nudatus到他们的原生栖息地和异种栖息地。我们测量了发芽，生存，和种子集，发现经常性的自交降低了所有方面的健身在这两个物种，最强烈的外国栖息地。一个模拟模型，从移植实验参数化，发现近亲繁殖减少健身到这样一个程度，顺序近交种群的任何一个物种将无法坚持在heterospecific占用的栖息地在没有持续的基因流。这些结果表明，个别移民是不可能形成持久的人口，因此，近交衰退有助于在这一物种对的罚款规模共存的情况下。
Incompletely reproductively isolated species often segregate into different microhabitats, even when they are able to survive and reproduce in both habitats. Longer term evolutionary factors may contribute to this lack of cross-habitat persistence. When reproductive interference reduces immigrant fitness, assortative mating, including self-fertilization, increases immigrants’ fitness in a single generation, but longer term, inbreeding depression may reduce the chance of population persistence. Two California monkeyflower species repeatedly segregate into drier and wetter areas in their zone of sympatry. To test whether inbreeding depression may contribute to the maintenance of this segregation pattern, we transplanted outbred and successively inbredMimulus guttatusandMimulus nudatusinto their native habitats and heterospecific habitats. We measured germination, survival, and seed set and found that recurrent selfing reduced all aspects of fitness in both species, most strongly in foreign habitats. A simulation model, parameterized from the transplant experiment, found that inbreeding reduced fitness to such an extent that sequentially inbred populations of either species would be unable to persist in heterospecific-occupied habitats in the absence of continued gene flow. These results demonstrate that individual immigrants are unlikely to form persistent populations and thus, inbreeding depression contributes to the absence of fine-scale coexistence in this species pair.
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DOI：
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发表时间：
2003
期刊：
影响因子：
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作者：
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胚乳发育的破坏是 Mimulus guttatus 和 M. nudatus 杂交种子无法存活的主要原因
DOI：
10.1101/029223
发表时间：
2015
期刊：
bioRxiv
影响因子：
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作者：
E. Oneal;J. Willis;R. Franks
通讯作者：
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