05 May, 2023

Floral scent and pollination on the invasive plant Coreopsis lanceolata in Japan

 By Arifin and Okamoto

A halictid bee visiting the flower of Coreopsis lanceolata,
with its entire body heavily loaded with pollen.

Coreopsis lanceolata, originally from North America, has become an invasive species in Japan. It has spread to various parts of Japan, including remote islands, and has a negative effect on the environment and native species by competing for resources and reducing light availability to native vegetation.

Reproductive success plays a crucial role in establishing and spreading invasive species in the introduced range. The invasive plant C. lanceolata is self-incompatible, meaning it cannot self-fertilize and depends on pollen vectors for seed production; however, it is known to produce many seeds, up to 12,000 per individual per flowering season. This study aimed to shed light on the reproductive biology and mutualistic plant-pollinator interactions that contribute to successful seed production in C. lanceolata in the introduced range of Japan. This study involved observing floral visitors, conducting bagged and open pollination treatments, and analyzing floral scents. This study discovered that C. lanceolata attracts a diverse group of insects, including 60 species from 20 families. However, one functional group, the halictid bees, was found to be the most important in terms of frequency of visits and pollen-carrying ability. The study also found that the floral scent of C. lanceolata mainly consists of monoterpenes, sesquiterpenes, and benzenoids. In addition, the average seed set was nearly 30% of the ovules produced in the introduced range of Japan. Overall, these findings provide insight into the mechanisms that allow invasive plant C. lanceolata to establish and thrive in new environments through successful reproduction. 

Read the scientific publication in JPE 



「オオキンケイギク(Coreopsis lanceolata)の花の匂いとコハナバチ科媒介への機能的特殊化」

オオキンケイギク(Coreopsis lanceolata)は北米原産であり、日本では侵略的な外来種である。日本では、本島だけでなく遠方の島々にまで広がり、在来種との資源競争を引き起こしている。



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