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首页> 外文期刊>Ecotropica >DIVERSITY OF FLOWER VISITORS AND THEIR ROLE FOR POLLINATION IN THE ORNITHOPHILOUS BROMELIAD VRIESEA FRIBURGENSIS IN TWO DIFFERENT HABITATS IN SOUTHERN BRAZIL
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DIVERSITY OF FLOWER VISITORS AND THEIR ROLE FOR POLLINATION IN THE ORNITHOPHILOUS BROMELIAD VRIESEA FRIBURGENSIS IN TWO DIFFERENT HABITATS IN SOUTHERN BRAZIL

机译：巴西南部两种不同生境的正畸性肉豆蔻鸢尾科病原菌中花访客的多样性及其授粉作用

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摘要

In order to analyze species richness of flower visitors to the bromeliad Vriesea friburgensis, and to relate the visitor spectrum to resource availability and differences in habitat, we studied its floral biology in two habitat types: dune vegetation and secondary Atlantic rain forest on Santa Catarina Island, southern Brazil. Flowering extends from October to February, the anthesis is diurnal. We found the reproductive system to be partially autogamous without the possibility of intra-floral selfing. Therefore the bromeliad is pollinator-dependent, but the flowers do not need to be cross-pollinated. Mean nectar sugar concentration was 20.7% with a high sucrose proportion. Flowers secreted 73.9 mu l nectar per day. Although the flowers show ornithophilous features like tubular and scentless flowers and higher energetic nectar in the morning hours, besides two hummingbird species we recorded 28 species of insects and spiders also associated with the flowers of V friburgensis. Species richness of flower visitors was higher in restinga than in secondary forest. In both habitat types hummingbirds and bees were the most frequent visitor groups, but whereas hummingbirds were the most frequent animals visiting flowers in secondary forest, followed by bees, the opposite was the case in the restinga habitats. Because friburgensis is partially autogamous, small bees might also be pollinators, transferring self-pollen. Thus, there is redundancy in the pollination service provided by birds and bees, leading to a high probability of successful reproduction in this bromeliad species. Accepted 31 January 2011.
机译：为了分析凤梨鸢尾花访客的物种丰富度，并将访客谱与资源可用性和栖息地差异联系起来，我们研究了圣卡塔琳娜岛上的两种栖息地类型的花生物学：沙丘植被和次生大西洋雨林，巴西南部。开花从十月到二月，花期是昼夜。我们发现生殖系统是部分同性的，没有发生花内自交的可能性。因此凤梨科植物是传粉媒介依赖性的，但花朵不需要交叉授粉。平均花蜜糖浓度为20.7％，蔗糖比例较高。花朵每天分泌73.9亩花蜜。尽管这些花在早晨表现出诸如管状和无香的花朵以及较高能量的花蜜之类的常食性特征，但除了两种蜂鸟物种外，我们还记录了28种昆虫和蜘蛛，它们也与弗氏堡花有关。 Resta地区的花访者物种丰富度高于次生林。在这两种生境类型中，蜂鸟和蜜蜂都是最常来访的人群，而蜂鸟是次生林中最常拜访花的动物，其次是蜜蜂，而在resta栖息地中则相反。由于friburgensis是部分同性的，所以小蜜蜂也可能是传粉者，传粉自花粉。因此，鸟类和蜜蜂提供的授粉服务存在冗余，导致该凤梨科物种成功繁殖的可能性很高。 2011年1月31日接受。

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