Nest-Site Characteristics Affect Probability of Nest Predation of Bull-Headed Shrikes
Nest-Site Characteristics Affect Probability of Nest Predation of Bull-Headed Shrikes
复制标题
巢穴特征影响牛头伯劳巢穴捕食的概率
DOI：
10.1676/11-164.1
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Endo
中科院分区：
文献类型：
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作者：
S. Endo
摘要我调查了日本繁殖的牛头伯劳（Lanius bucephalus）种群的巢捕食概率与巢址特征之间的关系：（1）巢高，（2）附在巢上的树枝数，（3）巢周围有刺的树枝数。在2008年和2009年期间发现了38个巢，其中16个被捕食，14个成功地在雏鸟中，4个被遗弃，2个被寄生，2个可能被部分掠夺，尽管实际原因尚不清楚。无论是巢的高度，也没有多刺的分支机构的数量与繁殖成功。然而，分支的数量与巢捕食的概率呈负相关。根据被掠夺的巢穴中的实物证据，主要的捕食者被认为是鸟类。牛头伯劳巢穴周围高密度的树枝可以确保它们不容易被捕食者发现和掠夺。
Abstract I investigated the relationship between the probability of nest predation and nest-site characteristics: (1) nest height above ground, (2) number of branches attached to a nest, and (3) number of thorny branches around the nest for a population of Bull-headed Shrikes (Lanius bucephalus) breeding in Japan. Thirty-eight nests were located during 2008 and 2009 of which 16 were lost to predation, 14 were successful in fledging young, four were abandoned, two were parasitized, and two may have been partially depredated, although the actual reason is unclear. Neither nest height nor the number of thorny branches was correlated with breeding success. However, the number of branches was negatively correlated with probability of nest predation. The primary predators were believed to be birds, based on physical evidence at depredated nests. A high density of branches around nests of Bull-headed Shrikes may ensure they are not easily discovered and depredated by predators.