Spatial mating networks in insect-pollinated plants
Spatial mating networks in insect-pollinated plants
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DOI：
10.1111/j.1461-0248.2008.01167.x
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发表时间：
2008-05-01
期刊：
影响因子：
8.8
通讯作者：
Bascompte, Jordi
中科院分区：
文献类型：
--
作者：
Fortuna, Miguel A.;Garcia, Cristina;Bascompte, Jordi
植物种群中的基因流动在很大程度上取决于景观的异质性。授粉粒的形状和树木的空间分布都会影响花粉粒的分布及其所含的基因类型，但人们对这两个因素的相对贡献知之甚少。利用遗传标记，我们在昆虫授粉植物马哈勒李种群中的任意两棵树之间建立了授粉事件的空间网络。然后，我们应用复杂网络科学中的工具来表征这种配对网络的结构。虽然每株树的供粉者数量分布相当均匀，但供者的身份在整个种群中是不均匀分布的。这导致了一个由一群母树和它们共享的花粉捐赠者组成的、以明确定义的模块或隔间结构的种群。远距离授粉活动有利于所有可用配偶之间的交配，从而减少了模块化结构。这增加了整个种群的基因流动，减少了其遗传结构，并潜在地减少了遗传漂移的作用。
Gene flow in plant populations is largely determined by landscape heterogeneity. Both the shape of the pollination kernel and the spatial distribution of trees affect the distribution of pollen grains and the genotypes they harbour, but little is known about the relative contribution of each of these two factors. Using genetic markers we build a spatial network of pollination events between any two trees in a population of Prunus mahaleb, an insect-pollinated plant. Then, we apply tools from the science of complex networks to characterize the structure of such a mating network. Although the distribution of the number of pollen donors per tree is quite homogeneous, the identity of donors is distributed heterogeneously across the population. This results in a population structured in well-defined modules or compartments, formed by a group of mother trees and their shared pollen donors. Long-distance pollination events decrease the modular structure by favouring mating among all available mates. This increases gene flow across the entire population, reducing its genetic structure, and potentially decreasing the role of genetic drift.