Data from: Non-native insects dominate daytime pollination in a high-elevation Hawaiian dryland ecosystem
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PREMISE OF THE STUDY: Over one-third of the native flowering plant species in the Hawaiian Islands are listed as federally Threatened or Endangered. Lack of sufficient pollination could contribute to reductions in populations, reproduction, and genetic diversity among these species, but has been little studied. METHODS: We used systematic observations and manual flower treatments to quantify flower visitation and outcrossing dependency of eight native (including four Endangered) plant species in a dryland ecosystem in Hawaii: Argemone glauca, Bidens menziesii, Dubautia linearis, Haplostachys haplostachya, Sida fallax, Silene lanceolata, Stenogyne angustifolia, Tetramolopium arenarium. KEY RESULTS: During 576.36 hours of flower observations, only insects visited the flowers. Out of all recorded flower visits, 85% were performed by non-native species, particularly honeybee (Apis mellifera) and flies in the family Syrphidae. Some plant species received little visitation (e.g., S. angustifolia received one visit in 120 observation hours), while others were visited by a wide diversity of insects. The Endangered plant species were visited by fewer visitor taxa than were the common native plant species. For six of the focal plant species, bagging of flowers to exclude pollinators resulted in significant reductions in seed set. CONCLUSIONS: The flower visitor community in this system, although heavily dominated by non-native insects, appears to be facilitating pollination for multiple plant species. Non-native insects may thus be sustaining biotic interactions otherwise threatened with disruption in this island ecosystem. This may be particularly important for the studied Endangered plant species, which exhibit fewer partners than the more common plant species. In compliance with data protection regulations, please contact the publication office if you would like to have your personal information removed from the database.
研究背景：夏威夷群岛超过三分之一的本土开花植物物种被列为美国联邦级受威胁（Threatened）与濒危（Endangered）物种。授粉不足可能导致这些物种种群规模缩减、繁殖能力下降以及遗传多样性丧失，但目前相关研究仍较为匮乏。 研究方法：本研究通过系统性观测与人工花部处理，量化夏威夷旱地生态系统中8种本土植物（其中4种为濒危（Endangered）物种）的访花行为与异交依赖程度，涉及物种包括：Argemone glauca、Bidens menziesii、Dubautia linearis、Haplostachys haplostachya、Sida fallax、Silene lanceolata、Stenogyne angustifolia、Tetramolopium arenarium。 主要结果：在总计576.36小时的花部观测中，仅昆虫类群造访目标花朵。在所有记录的访花事件中，85%由外来物种完成，尤以西方蜜蜂（Apis mellifera）与食蚜蝇科（Syrphidae）昆虫占比最高。部分植物物种的访花频率极低（例如S. angustifolia在120小时的观测中仅被造访1次），而另一些物种则有丰富多样的昆虫类群来访。濒危植物物种的访花类群数量少于常见本土植物物种。对6种目标植物进行套袋以隔绝传粉者后，其结实率均出现显著下降。 研究结论：尽管该系统中的访花类群以外来昆虫为主导，但它们似乎为多种植物物种提供了传粉便利。因此，外来昆虫可能维系了原本可能在这座岛屿生态系统中面临中断的生物交互关系。这一点对于本次研究的濒危植物物种尤为重要——相较于常见植物，这些濒危物种的传粉伙伴数量本就更少。 根据数据保护法规要求，若您希望将个人信息从本数据库中移除，请联系出版办公室。
