| タイトル |
-
en
Factors affecting individual variation in nest-defense intensity in colonially breeding Black-tailed Gulls (Larus crassirostris)
|
| 作成者 |
|
| アクセス権 |
open access |
| 主題 |
|
| 内容注記 |
-
Abstract
en
The physiological state of parent birds combined with the value of their clutch may affect the intensity of their nest defense. In colonially breeding birds, nest defense intensity may also be affected by the behavior of neighbors. We investigated individual variation in the intensity of nest defense among colonial Black-tailed Gulls Larus crassirostris in two years. Only 30-40% of males attacked a decoy of an egg predator (crow), and the other males and females rarely attacked. Males attacking the decoy had higher levels of plasma testosterone than males that did not attack. Each male's, but not female's, nest defense intensity was consistent throughout the incubation period and also across years. The intensity was not related to egg-laying date, clutch size, or age of offspring. The intensity was likely to be higher when individuals had one or more neighbors, representing higher nest defense intensity in the year where gulls had larger number of adjacent neighboring nests (5.23 nests), but this trend was not observed in the year where they had smaller number of the neighboring nests (3.73 nests). Thus, in addition to testosterone levels, behavior of neighbors also influences the intensity of nest defense.
|
| 出版者 |
en
Canadian Science Publishing
|
| 日付 |
|
| 言語 |
|
| 資源タイプ |
journal article |
| 出版タイプ |
AM |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/47660
|
| 関連 |
-
URI
http://www.nrcresearchpress.com/journal/cjz
-
isVersionOf
DOI
https://doi.org/10.1139/Z11-063
|
| 収録誌情報 |
-
-
en
Canadian Journal of Zoology
-
巻89
号10
開始ページ938
終了ページ944
|
| ファイル |
|
| コンテンツ更新日時 |
2023-07-26 |
