Evidence for pollinator sharing in Mediterranean nectar-mimic orchids:: absence of premating barriers?
Evidence for pollinator sharing in Mediterranean nectar-mimic orchids:: absence of premating barriers?
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DOI：
10.1098/rspb.2005.3069
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发表时间：
2005-06-22
影响因子：
4.7
通讯作者：
Widmer, A
中科院分区：
文献类型：
--
作者：
Cozzolino, S;Schiestl, FP;Widmer, A
传粉者专一性一直被认为是兰花生殖隔离的主要机制。然而，在地中海兰花中，许多物种通过模仿花蜜奖励植物来吸引和欺骗传粉者。为了测试在何种程度上欺骗兰花物种共享传粉者，我们收集和确定hernopollinaria携带昆虫，并使用核糖体序列来识别兰花物种hernopollinaria被删除。我们发现，社会和孤独的蜜蜂，也苍蝇，进行hemipollinaria属于9种兰花具有不同程度的专业化。特别是，Anacamptis morio，Dactylorhiza romana和Orchis mascula使用了大量的传粉者物种，而其他如Orchis quadripunctata似乎只由一种传粉者物种授粉。在携带花粉囊的昆虫中，有19%的昆虫携带来自一种以上兰花的花粉囊，这表明同域食物欺骗兰花可以共享传粉者。这种共享是显而易见的，甚至在兰花姐妹种，从而揭示了一个有效的重叠传粉者之间密切相关的物种。这些结果表明，在这些兰花不同程度的传粉特异性，并表明传粉特异性不能总是作为主要的隔离机制，在食物欺骗温带兰花。
Pollinator specificity has traditionally been considered the main reproductive isolation mechanism in orchids. Among Mediterranean orchids, however, many species attract and deceive pollinators by mimicking nectar-rewarding plants. To test the extent to which deceptive orchid species share pollinators, we collected and identified hernipollinaria-carrying insects, and used ribosomal sequences to identify the orchid species from which hernipollinaria were removed. We found that social and solitary bees, and also flies, carried hemipollinaria belonging to nine orchid species with different degrees of specialization. In particular, Anacamptis morio, Dactylorhiza romana and Orchis mascula used a large set of pollinator species, whereas others such as Orchis quadripunctata seemed to be pollinated by one pollinator species only. Out of the insects with hernipollinaria, 19% were found to carry hernipollinaria from more than one orchid species, indicating that sympatric food-deceptive orchids can share pollinators. This sharing was apparent even among orchid sister-species, thus revealing an effective overlap in pollinator sets among closely related species. These results suggest varying degrees of pollinator specificity in these orchids, and indicate that pollinator specificity cannot always act as the main isolation mechanism in food-deceptive temperate orchids.