Sympatric Sister Species of Californian Antirrhinum and Their Transiently Specialized Pollinators
Sympatric Sister Species of Californian Antirrhinum and Their Transiently Specialized Pollinators
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DOI：
10.1674/0003-0031-164.2.337
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发表时间：
2010-10-01
影响因子：
0.6
通讯作者：
Baum, David A.
中科院分区：
文献类型：
--
作者：
Oyama, Ryan K.;Jones, Kristina N.;Baum, David A.
研究了传粉者对同域分布的姐妹类群金鱼草和金鱼草的传粉反应。vexillo-calycalatum（车前草科）。这两个分类群，原产于北方加州，有重叠的地理分布，显示专业化不同的土壤类型和形态相似，除了它们不同的花色（分别为白色和紫色）。我们观察和识别访花者并进行阵列实验。我们的研究结果表明，类似的套房的传粉者访问两个植物类群，这意味着没有固定的偏好的传粉者物种的一部分。然而，当单个昆虫访问混合阵列，他们往往限制他们的访问，无论是白色或紫色花的分类群，可能导致在排斥性花粉转移，即使在细尺度同域分布的地区。观察到的非正式访问是值得注意的，因为A。subcordatum和A. vexillo-calyculatum最好解释为初期物种。因此，由个体传粉者向单一花色的专门化引起的选择性交配可能是允许这些谱系继续分化的关键。这些数据有助于我们了解被子植物物种和它们的动物传粉者之间的关系，以及这些相互作用如何有助于显花植物的多样化。
We investigated pollinator response to a pair of sympatric sister taxa, Antirrhinum subcordatum and A. vexillo-calycalatum (Plantaginaceae). These two taxa, native to northern California, have overlapping geographic distributions, show specialization to different soil types and are morphologically similar except that they differ in flower color (white and purple respectively). We observed and identified floral visitors and performed array experiments. Our results show that similar suites of pollinators visit both plant taxa, which implies no fixed preference on the part of the pollinator species. However, when individual insects visit mixed arrays, they tend to restrict their visits to either the white or purple flowered taxon, likely resulting in assortative pollen transfer even in areas of fine-scale sympatry. The assortative visitation observed is noteworthy given that A. subcordatum and A. vexillo-calyculatum are best interpreted as incipient species. Thus, assortative mating caused by the specialization of individual pollinators towards a single flower color may be crucial for allowing the continued divergence of these lineages. These data contribute to our understanding of the relationship between angiosperm species and their animal pollinators and how these interactions may contribute to the diversification of flowering plants.