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Hokkaido University Collection of Scholarly and Academic Papers >
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Spatiotemporal niche overlap, asymmetric reproductive interference, and population genetics between the sympatric species, Rhododendron diversipilosum and Rhododendron subarcticum, in alpine fellfield habitat
| Title: | Spatiotemporal niche overlap, asymmetric reproductive interference, and population genetics between the sympatric species, Rhododendron diversipilosum and Rhododendron subarcticum, in alpine fellfield habitat |
| Authors: | Shiotani, Yuki Browse this author | | Kudo, Gaku Browse this author →KAKEN DB |
| Keywords: | Alpine plant | | competition | | congeneric species | | interspecific interaction | | reproductive interference |
| Issue Date: | 28-Mar-2023 |
| Publisher: | Taylor & Francis |
| Journal Title: | Arctic antarctic and alpine research |
| Volume: | 55 |
| Issue: | 1 |
| Start Page: | 2188716 |
| Publisher DOI: | 10.1080/15230430.2023.2188716 |
| Abstract: | Reproductive interference between sympatric-related species often causes adverse impacts on rare species, which increases the risk of local extinction, particularly in small and isolated populations. To evaluate the congeneric interactions in alpine plants, we compared the ecological and genetic properties and assessed the reproductive interference between tetraploid Rhododendron diversipilosum (widespread species) and diploid Rhododendron subarcticum (rare species in alpine fellfields) in northern Japan. In alpine fellfields, R. diversipilosum is commonly distributed close to shrubby patches, whereas R. subarcticum tends to grow in more exposed places, although they are sometimes mixed. R. subarcticum initiated flowering one week earlier; however, the flowering periods overlapped between species, indicating incomplete phenological isolation. The pollination experiment showed that both species were self-incompatible. Furthermore, heterospecific pollination occurred only for R. subarcticum; however, hybrid seeds seldom germinated. These results indicate that reproductive interference is asymmetric between species, where only the rare R. subarcticum may suffer from heterospecific pollination. Genetic analysis showed that R. subarcticum populations had lower genetic diversity but higher divergence among populations than R. diversipilosum. Although spatiotemporal niche separations may mitigate reproductive interference, the risk of local extinction could be higher in R. subarcticum populations because of isolated distributions with low genetic diversity. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/89238 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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