著者
中村 浩志 北原 克宣 所 洋一
出版者
信州大学教育学部
雑誌
志賀自然教育研究施設研究業績 (ISSN:03899128)
巻号頁・発行日
no.40, pp.1-8, 2003
被引用文献数
1 1

The Mt. Hiuchi (2462m) is an isolated mountain from the North Alps (Hida Mountains). The Rock Ptarmigans on this mountain is the northernmost population in Japan. The distribution of territories and the number of the ptarmigans living on the mountain were examined on 23 and 24 June, 2002. A total of 8 territories were estimated. The estimated total number was 13 males and 8 females. Eight of 13 males were mated males with territory and the rest were single. The estimated number was about the same number estimated 35 years ago by Haneda et al. (1967). Why the small size population could continue so long time on the isolated mountaintop? The mechanism was discussed from the standpoints of carrying capacity, travel ability between mountains and the geographical location.
著者
北野 聡 河合 吉図 井田 秀行
出版者
信州大学教育学部
雑誌
志賀自然教育研究施設研究業績 (ISSN:03899128)
巻号頁・発行日
no.40, pp.9-13, 2003

信州大学教育学部附属志賀自然教育研究施設研究業績 (40): 9-13(2003)
著者
渡辺 隆一 大久保 明紀子 井田 秀行
出版者
信州大学
雑誌
信州大学教育学部附属志賀自然教育研究施設研究業績 (ISSN:03899128)
巻号頁・発行日
vol.43, pp.13-16, 2006-03-25

The leaf phenology of Betula ermanii was observed in Shiga Heights, central Japan from 1985 to 2004. During this period, 5 birches were selected and their phenological traits analyzed using succes- sive automatic daily photography. The annual variation of mean temperature at this monitor station, specifically over the last 10 years, has become increasingly warm. According to observable facts, these birches have gradually tended to accelerate the time of leaf flushing and delay the time of leaf coloring. This process is indispensable in clarifying the effects of global warming on ecosystems while continuing similar monitoring in/for the future.