Graduate School of Environmental Science, Hokkaido University, Sapporo, Hokkaido, Japan.
Naturwissenschaften. 2022 Jun 27;109(4):35. doi: 10.1007/s00114-022-01807-8.
Phenological overlap with pollinators is crucial for reproductive success in insect-pollinated plants. In this study, we examined whether pollinator visitation successfully occurred during an entire flowering season in two populations of the insect-pollinated spring ephemeral Trillium camschatcense in the Tokachi region of Hokkaido, northern Japan. We bagged flowers and excluded pollinator visitation during either the first or the last half of the entire flowering season to compare pollination success between the two periods. The two populations have experienced differing levels of climate warming in the last 60 years, which impacted pollinator visitation. In the population experiencing temperature rise more rapidly, fertilization rate and seed set decreased sharply when bagged during the first half period, indicating that pollinator visitation is skewed to the early part of the flowering season. The temporal skewness of pollination success would be an early warning signal of the impacts of climate warming on the reproductive success of T. camschatcense.
与传粉者的物候重叠对于虫媒授粉植物的繁殖成功至关重要。在这项研究中，我们检查了在日本北海道十胜地区的两个昆虫授粉的春季短命植物 Trillium camschatcense 种群中，传粉者的访问是否在整个开花季节内成功发生。我们在整个开花季节的前半段或后半段期间对花朵进行套袋并排除传粉者的访问，以比较两个时期的授粉成功率。这两个种群在过去 60 年中经历了不同程度的气候变暖，这影响了传粉者的访问。在经历了更快升温的种群中，当在开花季节的前半段进行套袋时，受精率和种子结实率急剧下降，表明传粉者的访问偏向于开花季节的早期。授粉成功的时间偏斜将是气候变暖对 T. camschatcense 繁殖成功影响的早期预警信号。
