|| 要旨トップ | 目次 |||日本生態学会第62回全国大会 (2015年3月、鹿児島) 講演要旨
一般講演（口頭発表） G1-15 (Oral presentation)
Elevation gradients are important drivers of divergence in tree populations, yet little is known about which abiotic factors along these gradients are responsible for divergence. The endemic Hawaiian tree, `ōhi`a lehua (Metrosideros polymorpha), has diverged along elevation gradients in the forms of two pubescent varieties (M. polymorpha var. incana and M. polymorpha var. polymorpha) on Hawai`i Island. We are conducting field, greenhouse, and growth-chamber experiments on open-pollinated seedlings from six pubescent populations spanning the full elevation range of this species on Hawai`i Island. We will report the results of the reciprocal transplant experiment, which will allow estimation of the strength of local adaptation across the elevation gradient, and the stress-response experiments of seedlings exposed to environmental extremes (e.g., high UV radiation and low temperature), which will give us a better understanding of the environmental factors responsible for local adaptation. Results will reveal insight into how elevation gradients drive divergence in long-live trees as well as important ecological differences between two of the three dominant forms of M. polymorpha on Hawai`i Island.