|| 要旨トップ | 目次 |||日本生態学会第57回全国大会 (2010年3月，東京) 講演要旨|
This study was to find out the responsiveness of some mangrove communities after cyclone impact in the Ayeyarwady mangrove forests of Myanmar. We recorded mangrove species and their positions by using three belt transects (each 10 m x 50 m) at low ground with Rhizophora apiculata dominants, middle ground with Avicennia officinalis dominants and high ground with Heritiera fomes dominants. Due to the cyclone, the mortality of A. officinalis and H. fomes trees at middle and high ground was less than 10 % whereas that of R. apiculata at low ground was more than 90 %. Almost all survival trees of A. officinalis and H. fomes had high ability to reproduce vegetative sprouts from damaged stems, and abundant mangrove seedlings were also observed in these two communities. In case of R. apiculata community, few survival trees of R. apiculata had no vegetative sprouts. Furthermore, limited number of mangrove seedlings was also observed in this community. However, the number of mangrove saplings in this community seemed to be more abundant than two other communities, and these saplings seemed to substitute for large canopy gaps from high mortality of trees. Therefore, without any more disturbances, natural mangroves are highly likely to respond severe abiotic disturbance with their own survival strategies.