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24 巻 , 1 号
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  • 木村 裕一, 水野聖子
    24 巻 (2012) 1 号 p. 14-19
    公開日: 2013/08/26
    ジャーナル フリー
    We developed a nest box trap for the Broad-billed Roller Eurystomus orientalis. This capture trap is a technique for monitoring the breeding ecology of this species. Important features of this trap are (1) ease of setting and (2) safety for captured birds. We captured rollers using this trap on 27 occasions at 24 nest boxes in mid-May, 2010. This capture period was during the pre-egg-laying stage. We captured 12 individuals. Ten individuals bred in the nest boxes in which they were captured, one individual bred in a different location, and one individual was missing. In some cases, nest box trap malfunction and avoidance of the trap (i.e., removing a pin from the trap) were observed. On the basis of our results, it appears that the trap is useful for capturing E. orientalis; however, we suggest that some points can be improved, such as changing materials (i.e., pin types and wires). Because capturing during the pre-incubation period and other periods could disturb breeding, we concluded that it is best to capture the rollers during the egg-incubation period.
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