title: Demonstration of pollinator-mediated competition between two native Impatiens species, Impatiens noli-tangere and I. textori (Balsaminaceae).
abstract: Plant-plant interspecific competition via pollinators occurs when the flowering seasons of two or more plant species overlap and the pollinator fauna is shared. Negative sexual interactions between species (reproductive interference) through improper heterospecific pollen transfer have recently been reported between native and invasive species demonstrating pollination-driven competition. We focused on two native Impatiens species (I. noli-tangere and I. textori) found in Japan and examined whether pollinator-mediated plant competition occurs between them. We demonstrate that I. noli-tangere and I. textori share the same pollination niche (i.e., flowering season, pollinator fauna, and position of pollen on the pollinator's body). In addition, heterospecific pollen grains were deposited on most stigmas of both I. noli-tangere and I. textori flowers that were situated within 2 m of flowers of the other species resulting in depressed fruit set. Further, by hand-pollination experiments, we show that when as few as 10% of the pollen grains are heterospecific, fruit set is decreased to less than half in both species. These results show that intensive pollinator-mediated competition occurs between I. noli-tangere and I. textori. This study suggests that intensive pollinator-mediated competition occurs in the wild even when interacting species are both native and not invasive.
authors: Department of Biology, Faculty of Science, Shinshu University Nagano, Japan.
authors: Nanako
authors: N
authors: Tokuda
authors: Department of Biology, Faculty of Science, Shinshu University Nagano, Japan.
authors: Mitsuru
authors: M
authors: Hattori
authors: Department of Biology, Faculty of Science, Shinshu University Nagano, Japan.
authors: Kota
authors: K
authors: Abe
authors: Department of Biology, Faculty of Science, Shinshu University Nagano, Japan.
authors: Yoshinori
authors: Y
authors: Shinohara
authors: Department of Biology, Faculty of Science, Shinshu University Nagano, Japan.
authors: Yusuke
authors: Y
authors: Nagano
authors: Department of Biology, Faculty of Science, Shinshu University Nagano, Japan ; Institute of Mountain Science, Shinshu University Nagano, Japan.
authors: Takao
authors: T
authors: Itino
keywords: Bumblebees; improper pollen transfer; plant–plant interaction; pollination; reproductive interference