Some effects of inclement weather conditions on the survival and condition of bull-headed shrike nestlings
Some effects of inclement weather conditions on the survival and condition of bull-headed shrike nestlings
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DOI：
10.1046/j.1440-1703.2001.00371.x
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发表时间：
2001-03-01
影响因子：
2
通讯作者：
Takagi, M
中科院分区：
文献类型：
--
作者：
Takagi, M
1933 年，恶劣的天气袭击了日本，这使得可以进行自然实验来研究天气条件对牛头伯劳 Lanius bucephalus 筑巢成功和雏鸟生长的影响。对 1992 年和 1993 年牛头伯劳的繁殖生物学与天气条件和繁殖时间的关系进行了检查。每年两个繁殖季节分为早、晚两个时期。虽然两个时期的雏鸟期巢存活概率几乎相等，但早期卵期巢存活概率明显低于后期。 1993年，后期雏鸟成活概率明显低于前期；后期降水量波动较大，较1992年同期偏冷。“消失”雏鸟数量与日平均降水量呈正相关。消失的雏鸟中大部分是每窝中最轻的。后期饲养的鸽子比早期饲养的鸽子羽翼更轻。尽管伯劳采取了异步孵化的方式，但后来的繁殖者无法克服1993年不可预测的恶劣天气。
Inclement weather struck Japan in 1933, permitting a natural experiment for examining the effect of weather conditions on nesting success and nestling growth of the bull-headed shrike, Lanius bucephalus. Aspects of the breeding biology of bull-headed shrikes in relation to weather conditions and timing of breeding in 1992 and 1993 were examined. The two breeding seasons were divided into two periods, early and late, in each year. While the probability of nest survival in nestling stages during both periods was almost equal, the probability of nest survival in the egg stage during the early period was significantly lower than that during the late period. In 1993, the probability of nestling survival during the late period was significantly lower than during the early period; the late period had larger fluctuations of precipitation and was colder than the same period in 1992. The number of 'disappeared' nestlings positively correlated with mean precipitation per day. The greater part of the disappeared nestlings was the lightest in each brood. Late breeders fledged lighter young than the early breeders. Although shrikes adopted hatching asynchrony, the late breeders could not surmount the unpredictable inclement weather in 1993.