著者

橋本 啓史 須川 恒 西野 麻知子 石川 俊之

出版者

「野生生物と社会」学会

雑誌

野生生物保護 (ISSN:13418777)

巻号頁・発行日

vol.14, no.1-2, pp.15-29, 2013-07-01 (Released:2017-09-07)

参考文献数

40

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We studied the impacts of human disturbances by boats on wintering waterbirds at 2 sites, in the North and South of Lake Biwa, a Ramsar wetland in Shiga Prefecture, Japan. Most land-feeding ducks (Anas platyrhynchos, An. poecilorhyncha, An. crecca, and An. formosd) slept offshore during the daytime. Herbivorous ducks (An. penelope, An. strepera, and An, falcata) foraged on the water surface. Diving herbivorous waterbirds (Fulica atra) foraged by diving offshore in the North, and by surface-feeding over a wide area of the water surface in the South. Most diving ducks (Ayihya ferina, Ay. fuligula, Ay. marila, and Bucephala clangula) slept on the water surface near the shoreline during the daytime, and some individuals started diving to forage in the afternoon. At both sites, waterbirds were often disturbed by fishing boats. Some birds flew away from the disturbance, but the species foraging in the daytime tended to come back to the same area and resume foraging promptly, whereas the species sleeping in the daytime tended not to come back.

著者

橋本 啓史 澤 邦之 田端 敬三 森本 幸裕 西尾 伸也

出版者

社団法人日本造園学会

雑誌

ランドスケープ研究 : 日本造園学会誌 : journal of the Japanese Institute of Landscape Architecture (ISSN:13408984)

巻号頁・発行日

vol.69, no.5, pp.529-532, 2006-03-27

被引用文献数

3 2

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Tree hollows are important nest and roost sites for various animals such as Ninox scutulata even in urban areas, but the number of such sites is very low. In this study, we recorded the characteristics of legacy trees with hollows in an urban area within Kyoto City (25km^2), Japan in 2002. We found 288 legacy trees with a trunk perimeter more than 300 cm and 94 trees with hollows. Legacy trees of Castanopsis sieboldii (an ever-green broad-leaf tree) and Aphananthe aspera (a deciduous broad-leaf tree) had a high rate of hollows. All six legacy trees of Cinnamomum camphora (an ever-green broad-leaf tree) with more than 1.5 m of DBH had hollows, but other trees of this species did not have hollows even when the trunk perimeter was more than 300 cm. We applied a logistic regression model to trunk perimeter and the probability of hollow-bearing in each species in an urban woods. We also predicted tree perimeter in relation to age from the annual relative growth rate in each species. A. aspera trees showed the highest incidence of tree hollows in relation to trunk perimeter, but these trees grow very slowly. Celtis sinensis trees grow rapidly, but they have a lower rate of tree hollows than A. aspera. Z. serrata trees grow at an intermediate speed and rarely have tree hollows. Cinnamomum camphora trees grow rapidly. Castanopsis sieboldii trees grow at an intermediate speed.

著者

橋本 啓史 澤 邦之 田端 敬三 森本 幸裕 西尾 伸也

出版者

公益社団法人 日本造園学会

雑誌

ランドスケープ研究 (ISSN:13408984)

巻号頁・発行日

vol.69, no.5, pp.529-532, 2006 (Released:2007-11-13)

参考文献数

18

被引用文献数

3 2

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Tree hollows are important nest and roost sites for various animals such as Ninox scutulata even in urban areas, but the number of such sites is very low. In this study, we recorded the characteristics of legacy trees with hollows in an urban area within Kyoto City (25 km2), Japan in 2002. We found 288 legacy trees with a trunk perimeter more than 300 cm and 94 trees with hollows. Legacy trees of Castanopsis sieboldii (an ever-green broad-leaf tree) and Aphananthe aspera (a deciduous broad-leaf tree) had a high rate of hollows. All six legacy trees of Cinnamomum camphora (an ever-green broad-leaf tree) with more than 1.5 m of DBH had hollows, but other trees of this species did not have hollows even when the trunk perimeter was more than 300 cm. We applied a logistic regression model to trunk perimeter and the probability of hollow-bearing in each species in an urban woods. We also predicted tree perimeter in relation to age from the annual relative growth rate in each species. A. aspera trees showed the highest incidence of tree hollows in relation to trunk perimeter, but these trees grow very slowly. Celtis sinensis trees grow rapidly, but they have a lower rate of tree hollows than A. aspera. Z. serrata trees grow at an intermediate speed and rarely have tree hollows. Cinnamomum camphora trees grow rapidly. Castanopsis sieboldii trees grow at an intermediate speed.

著者

田端 敬三 橋本 啓史 森本 幸裕

出版者

日本緑化工学会

雑誌

日本緑化工学会誌 (ISSN:09167439)

巻号頁・発行日

vol.41, no.1, pp.97-102, 2015 (Released:2016-04-19)

参考文献数

43

被引用文献数

1 4

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京都下鴨神社の社叢,糺の森全域において2002年と2010年に実施した幹直径10 cm 以上の全樹木対象の毎木調査結果から,アラカシ,シラカシの断面積成長量に対する初期サイズおよび周辺競争個体の影響を検討した。その結果,アラカシ,シラカシのいずれも断面積の初期値と断面積成長量は有意な正の相関を示した。アラカシでは半径6 m,シラカシは半径8 m 範囲内までに位置する競争個体が対象個体の成長に影響していた。アラカシでは初期サイズと周辺の競争個体からの被圧の2要因による成長への影響が強く見られ,これらを説明変数とする成長モデルの説明力は54%であった。一方,シラカシでは41%にとどまり,他の要因の影響も示唆された。