Anthropogenic disturbance promotes hybridization between Banksia species by altering their biology
Anthropogenic disturbance promotes hybridization between Banksia species by altering their biology
复制标题
DOI：
10.1046/j.1420-9101.2003.00548.x
复制
发表时间：
2003-07-01
影响因子：
2.1
通讯作者：
Miller, BP
中科院分区：
文献类型：
--
作者：
Lamont, BB;He, T;Miller, BP
在106个位于人为干扰地点（主要是道路）或其附近的钩角小蠊种群中，有12个种群被鉴定为钩角小蠊与prionotes小蠊的杂交，而在156个未受人为干扰的种群中没有发现钩角小蠊与prionotes小蠊的杂交。形态测量学和AFLP标记证实，在受干扰的生境中存在一个杂交群体，而在未受干扰的植被中，两种物种共存的地方没有中间群体。在12个地点，受干扰生境中两种植物的个体比未受干扰生境中的个体更健壮，体积更大，花头更多。这些更多产的植物也表现出季节和开花时间的变化。人为干扰通过促进钩叶螺旋藻提早开花和延长螺旋藻的开花时间，打破了两种植物之间的物候屏障。我们得出结论，人为干扰通过减少种群间分离、增加配子产生、特别是促进共花而增加基因流动的机会，从而促进杂交。
Putative hybrids between Banksia hookeriana and B. prionotes were identified among 12 of 106 populations of B. hookeriana located at or near anthropogenically disturbed sites, mainly roadways, but none in 156 undisturbed populations. Morphometrics and AFLP markers confirmed that a hybrid swarm existed in a selected disturbed habitat, whereas no intermediates were present where the two species co-occurred in undisturbed vegetation. Individuals of both species in disturbed habitats at 12 sites were more vigorous, with greater size and more flower heads than their counterparts in undisturbed vegetation. These more fecund plants also showed a shift in season and duration of flowering. By promoting earlier flowering of B. hookeriana plants and prolonging flowering of B. prionotes , anthropogenic disturbance broke the phenological barrier between these two species. We conclude that anthropogenic disturbance promotes hybridization through increasing opportunities for gene flow by reducing interpopulation separation, increasing gamete production and, especially, promoting coflowering.