抄録
The Sakhalin kelp Saccharina latissima have been collected in Wakkanai, Northern Hokkaido, Japan, in 1973 and 1983, also obtained in Southern Sakhalim, Russia. Diving researches were conducted from 2013 to 2015 in Koetoi and Hourai, Wakkanai, also Yabloney, Bogdanovitch Krilion, Korsakov, and Lesnoye, southern Sakhalin, August 2013. Saccharina latissima was not found in the present sampling fields. However, S. japonica, Alaria crassifolia and A. sp. were observed in these sites. Water temperature and light intensity from 2016 to 2017, change of water temperature of past thirty years, recent situation of kelp community in Wakkanai is shown. Also, change of water temperature in Yanloney and Boddanovitch from 2008-2009, in Korsakov from 2012-2013 were shown. Our study examined this change of flora in Wakkanai and Southern Sakhalin.
