Floral density and co‐occurring congeners alter patterns of selection in annual plant communities*
Floral density and co‐occurring congeners alter patterns of selection in annual plant communities*
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花密度和共生同源物改变一年生植物群落的选择模式*
DOI：
10.1111/evo.13960
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发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
Geber, Monica A.
中科院分区：
文献类型：
--
作者：
Eisen, Katherine E.;Wruck, Amy C.;Geber, Monica A.
虽然花的进化和多样化通常归因于传粉媒介介导的选择，但共存植物物种之间的相互作用可以改变传粉媒介和其他媒介介导的选择模式。花的密度和同类物种丰富度的影响模式的净和传粉媒介介导的选择在一个社区中的多个共同发生的物种是未知的，很可能取决于共同发生的植物是否经历竞争或促进繁殖。我们进行了观察研究的选择四种ofClarkia（柳叶菜科）和测试传粉媒介介导的选择两个Clarkiaspecies在社区不同的同类物种丰富度和当地的花密度。当选择与社会背景不同，选择一般是更强的社区与较少的物种，当地同种花密度较高，当地异种花密度较低。这些模式表明，种内竞争在高密度和种间竞争在低密度可能会影响花性状的进化。然而，花性状的选择不是传粉媒介介导的clarkia cylindricandclarkia xantiana，尽管在传粉媒介的访问和花粉限制的程度在社区C。圆柱形的因此，共存物种之间的相互作用可能会改变由非生物选择因子介导的选择模式。
Although the evolution and diversification of flowers is often attributed to pollinator-mediated selection, interactions between co-occurring plant species can alter patterns of selection mediated by pollinators and other agents. The extent to which both floral density and congeneric species richness affect patterns of net and pollinator-mediated selection on multiple co-occurring species in a community is unknown and is likely to depend on whether co-occurring plants experience competition or facilitation for reproduction. We conducted an observational study of selection on four species ofClarkia(Onagraceae) and tested for pollinator-mediated selection on twoClarkiaspecies in communities differing in congeneric species richness and local floral density. When selection varied with community context, selection was generally stronger in communities with fewer species, where local conspecific floral density was higher, and where local heterospecific floral density was lower. These patterns suggest that intraspecific competition at high densities and interspecific competition at low densities may affect the evolution of floral traits. However, selection on floral traits was not pollinator mediated inClarkia cylindricaorClarkia xantiana, despite variation in pollinator visitation and the extent of pollen limitation across communities forC. cylindrica. As such, interactions between co-occurring species may alter patterns of selection mediated by abiotic agents of selection.