Relative importance of diurnal and nocturnal pollinators for reproduction in the early spring flowering shrub Stachyurus praecox (Stachyuraceae)
Relative importance of diurnal and nocturnal pollinators for reproduction in the early spring flowering shrub Stachyurus praecox (Stachyuraceae)
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DOI：
10.1111/1442-1984.12299
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发表时间：
2020-10-23
影响因子：
1.4
通讯作者：
Sugiura, Shinji
中科院分区：
文献类型：
--
作者：
Funamoto, Daichi;Sugiura, Shinji
广义授粉系统可能有利于早春开花植物，因为在此期间传粉活动是不可预测的。许多以前的研究都集中在白天的访客授粉的重要性，因此，信息的贡献夜间访客授粉早春是有限的。本研究进行了评估的相对重要性，在早春开花雌雄异株的灌木Stachyurus praecox（Stachyuraceae），在日本中部的两个温带森林的昼夜传粉者。在白天和夜晚观察雌花和雄花的访客，并比较它们对结实的相对贡献。传粉昆虫观察表明，白天和夜间昆虫访问雄花和雌花，主要的花访客是白天的小蜜蜂和苍蝇以及夜间定居的飞蛾。白天和夜间的访花者也充当传粉者，如S.从雌花上采集的昆虫上附着有早花。传粉实验表明，白天传粉者对结实的贡献高于夜间传粉者。本研究结果表明，S.早熟禾的传粉系统广泛，既有昼行性昆虫，也有夜间定居的蛾类。虽然昼行性昆虫在传粉过程中的作用更为重要。早花蛾、夜宿蛾在早春可能起补充作用。
Generalized pollination systems may be favored in early spring flowering plants, as during this period pollinator activity is unpredictable. Many previous studies have concentrated on the importance of diurnal visitors in pollination, and consequently, information on the contribution of nocturnal visitors to pollination in early spring is limited. This study was conducted to evaluate the relative importance of diurnal and nocturnal pollinators in the early spring flowering dioecious shrub Stachyurus praecox (Stachyuraceae), in two temperate forests in central Japan. Visitors to the female and male flowers were observed during day and night, and their relative contributions to seed set were compared. The pollinator observations revealed that the diurnal and nocturnal insects visited both male and female flowers, and that the main flower visitors were diurnal small bees and flies as well as nocturnal settling moths. The diurnal and nocturnal flower visitors also acted as pollinators, as the pollen grains of S. praecox were attached to the insects collected from the female flowers. Pollination experiments demonstrated that the contributions of diurnal pollinators to the seed set were higher than those of the nocturnal pollinators. The results of this study indicate that S. praecox has a generalized pollination system, comprising both diurnal insects and nocturnal settling moths. Although the roles of diurnal insects are more important in the pollination of S. praecox, nocturnal settling moths may have a complementary role in early spring.