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1 0 0 0 OA 微小血管機能からみた肺病変 : 肺疾患の診断治療への新たな微小血管研究手法の応用

著者: 伊藤博道
巻号頁・発行日: 2012

筑波大学博士 (医学) 学位論文・平成24年4月30日授与 (甲第6281号)

2013-12-06 08:31:32
1 + 0 Twitter

http://hdl.handle.net/2241/120275

1 0 0 0 OA ウキゴリ属(Gymnogobius,Gobiidae)魚類の個体発生と生活史の進化に関する研究

著者: 原田慈雄
出版者: 京都大学
巻号頁・発行日: 2005-03-23

新制・課程博士

2013-12-05 19:59:00
1 はてなブックマーク

http://hdl.handle.net/2433/145042

1 0 0 0 OA MeCabで利用可能なロシア語辞書について

著者: 上原順一 Уэхара Дзюнъити
出版者: 大阪大学大学院言語文化研究科
雑誌: 言語文化研究 (ISSN:03874478)
巻号頁・発行日: vol.37, pp.315-322, 2011-03-31

言語社会専攻

2013-12-05 08:53:33
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http://hdl.handle.net/11094/24677

1 0 0 0 OA Trapline foraging by bumble bees: VII. Adjustments for foraging success following competitor removal

著者: Ohashi Kazuharu Leslie Alison Thomson James D.
出版者: Oxford University Press
雑誌: Behavioral ecology (ISSN:10452249)
巻号頁・発行日: vol.24, no.3, pp.768-778, 2013-05
被引用文献数: 9

Animals collecting food from renewable resource patches scattered in space often establish small foraging areas to which they return faithfully. Such area fidelity offers foraging advantages through selection of profitable patches, route minimization, and regular circuit visits to these patches (“trapline foraging”). Resource distribution under field conditions may often vary in time, however, especially when competitors suddenly vanish and a number of patches become available for their neighbors. Previous studies suggested that site-faithful foragers of bumble bees quickly respond to such unexpected events by readjusting their foraging areas, although it is not clear how much their foraging performance was improved, beyond the simple relaxation of competitive pressure, or how they manifest such flexibility while persistently using certain foraging areas or paths. Here, we conducted indoor flight-cage experiments with bumble bees and found that a bee, when encountering a loss of its competitor, improved its foraging performance to a greater extent than expected from a simple relaxation of competitive pressure by increasing the size of its foraging area. Moreover, bees with better-established traplines achieved greater foraging areas after the loss of competitors, suggesting that bees do not necessarily need to “sample” neighboring patches to monitor temporal changes in environments. We discuss how periodical returns and route memory associated with accurate reward values could allow inherently conservative trapliners to make flexible adjustments, by effectively monitoring their circumstances and quickly readjusting to detected changes.