Mating patterns, pollen dispersal, and the ecological maternal neighbourhood in a Prunus mahaleb L. population
Mating patterns, pollen dispersal, and the ecological maternal neighbourhood in a Prunus mahaleb L. population
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DOI：
10.1111/j.1365-294x.2005.02542.x
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发表时间：
2005-05-01
影响因子：
4.9
通讯作者：
Jordano, P
中科院分区：
文献类型：
--
作者：
García, C;Arroyo, JM;Jordano, P
性别多态性、植物-动物相互作用和环境异质性是交配系统和花粉传播模式变异的三个重要来源。我们使用后代阵列和父系分析，以评估性别类型和密度水平的影响，在交配模式的变化在一个高度孤立的人口内的马哈利，一个雌雄异株的物种。对种群中的所有成年树进行取样和定位。远距离昆虫介导的授粉事件的直接估计值较低（<10%）。性别表达对交配系统有很大影响，降低了雌雄同体树的异交率（t（m））和花粉库多样性。远的交配距离（> 250米）显着更频繁的女性母树。当地树木密度的变化也影响花粉池多样性和intermate距离，与更高的有效数量的父亲（k（e））和更长的intermate距离雌树在低密度补丁。典型相关分析表明，交配变量和产妇的生态邻里之间的显着相关性。只有第一个典型变量是显着的，解释了78%的变异。异交率趋于下降，父亲之间的相关性趋于增加，当母树生长在密集的补丁与其他木本物种的高覆盖和较高的植被远离松林边缘。我们强调的相关性，考虑母性的生态邻居的影响，交配系统和基因流的研究作为母本树同时作为受体的花粉和种子的来源被分散。
Gender polymorphism, plant-animal interactions, and environmental heterogeneity are the three important sources of variation in mating system and pollen dispersal patterns. We used progeny arrays and paternity analysis to assess the effects of gender type and density level on variation in mating patterns within a highly isolated population of Prunus mahaleb, a gynodioecious species. All the adult trees in the population were sampled and located. The direct estimate of long-distance insect-mediated pollination events was low (< 10%). Gender expression deeply influenced the mating system, decreasing the outcrossing rates (t(m)) and the pollen pool diversity in hermaphrodite trees. Long intermate distances (> 250 m) were significantly more frequent among female mother trees. Variation in local tree density also affected pollen pool diversity and intermate distance, with a higher effective number of fathers (k(e)) and longer intermate distances for female trees in low-density patches. A canonical correlation analysis showed significant correlations between mating variables and the maternal ecological neighbourhood. Only the first canonical variable was significant and explained 78% of variation. Outcrossing rates tended to decrease, and the relatedness among the fathers tended to increase, when mother trees grew in dense patches with high cover of other woody species and taller vegetation away from the pine forest edge. We highlight the relevance of considering maternal ecological neighbourhood effects on mating system and gene flow studies as maternal trees act simultaneously as receptors of pollen and as sources of the seeds to be dispersed.