Indirect interactions between invasive and native plants via pollinators
Indirect interactions between invasive and native plants via pollinators
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DOI：
10.1007/s00114-008-0481-x
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发表时间：
2009-03-01
影响因子：
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通讯作者：
Mueller, Christine B.
中科院分区：
文献类型：
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作者：
Kaiser-Bunbury, Christopher N.;Mueller, Christine B.
在广义授粉系统中，外来植物物种的存在可能会改变传粉者对本地植物物种的觅食行为，这可能会导致本地植物物种的繁殖成功率降低。我们在毛里求斯的一项实地研究中，在小的空间和时间尺度上测试了这种间接相互作用的想法，在那里，入侵的草莓番石榴，Psidium cattleianum，为昆虫传粉者提供了额外的花卉资源。我们预测，开花番石榴的存在将通过转移共同的传粉者，间接地对具有相似花朵的特有植物Bertiera zaluzania的繁殖成功产生负面影响。我们从B的一半左右移走了5米半径范围内的卡特兰花。zaluzania目标植物（处理），而留下另一半周围的P.cattleianum花完整（对照）。到目前为止，最丰富和共享的传粉者是引进的蜜蜂，意大利蜜蜂，但其访问率处理和对照植物相似。同样，B的果实和结实率以及果实大小和重量。zaluzania不受P. cattleianum花的影响。尽管其他研究表明外来植物物种对邻近的本地植物物种有小规模的影响，但我们没有发现在我们的系统中存在这种负面间接相互作用的证据。引进的、已建立的A. mellifera表明它们取代了本地昆虫访花者，并作为本地植物物种的传粉者。然而，A.与本地传粉者相比，意大利蜜蜂是未知的。
In generalised pollination systems, the presence of alien plant species may change the foraging behaviour of pollinators on native plant species, which could result in reduced reproductive success of native plant species. We tested this idea of indirect interactions on a small spatial and temporal scale in a field study in Mauritius, where the invasive strawberry guava, Psidium cattleianum, provides additional floral resources for insect pollinators. We predicted that the presence of flowering guava would indirectly and negatively affect the reproductive success of the endemic plant Bertiera zaluzania, which has similar flowers, by diverting shared pollinators. We removed P. cattleianum flowers within a 5-m radius from around half the B. zaluzania target plants (treatment) and left P. cattleianum flowers intact around the other half (control). By far, the most abundant and shared pollinator was the introduced honey bee, Apis mellifera, but its visitation rates to treatment and control plants were similar. Likewise, fruit and seed set and fruit size and weight of B. zaluzania were not influenced by the presence of P. cattleianum flowers. Although other studies have shown small-scale effects of alien plant species on neighbouring natives, we found no evidence for such negative indirect interactions in our system. The dominance of introduced, established A. mellifera indicates their replacement of native insect flower visitors and their function as pollinators of native plant species. However, the pollination effectiveness of A. mellifera in comparison to native pollinators is unknown.