Alien pollinator promotes invasive mutualism in an insular pollination system |
| |
Authors: | Tetsuto Abe Katsuyuki Wada Yuka Kato Shun’ichi Makino Isamu Okochi |
| |
Institution: | (1) Kyushu Research Center, Forestry and Forest Products Research Institute, Kurokami 4-11-16, Kumamoto 860-0862, Japan;(2) Institute of Boninology, Chichi-jima Miyanohamamichi, Ogasawara, Tokyo 100-2101, Japan;(3) Tokyo Metropolitan University, Minamiohsawa 1-1, Hachioji, Tokyo 192-0397, Japan;(4) Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki 305-8687, Japan |
| |
Abstract: | The alien predatory lizard, Anolis carolinensis, has reduced the insect fauna on the two main islands of the Ogasawara archipelago in Japan. As a result of this disturbance,
introduced honeybees are now the dominant visitors to flowers instead of endemic bees on these islands. On the other hand,
satellite islands not invaded by alien anoles have retained the native flower visitors. The effects of pollinator change on
plant reproduction were surveyed on these contrasting island groups. The total visitation rates and the number of interacting
visitor groups on main islands were 63% and 30% lower than that on satellite islands, respectively. On the main islands, the
honeybees preferred to visit alien flowers, whereas the dominant endemic bees on satellite islands tended to visit native
flowers more frequently than alien flowers. These results suggest that alien anoles destroy the endemic pollination system
and caused shift to alien mutualism. On the main islands, the natural fruit set of alien plants was significantly higher than
that of native plants. In addition, the natural fruit set was positively correlated with the visitation rate of honeybees.
Pollen limitation was observed in 53.3% of endemic species but only 16.7% of alien species. These data suggest that reproduction
of alien plants was facilitated by the floral preference of introduced honeybees. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|