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首页> 外文期刊>BMC Veterinary Research >Factors influencing mortality in a captive breeding population of Loggerhead Shrike, Eastern subspecies ( Lanius ludovicianus ssp.) in Canada
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Factors influencing mortality in a captive breeding population of Loggerhead Shrike, Eastern subspecies ( Lanius ludovicianus ssp.) in Canada

机译：影响加拿大东部亚种Loggerhead Shrike圈养繁殖种群死亡率的因素（Lanius ludovicianus ssp。）

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Background The Loggerhead Shrike, Eastern subspecies ( Lanius ludovicianus ssp.) (LOSH) is a predatory songbird native to Eastern North America. It is estimated that there are fewer than 55 breeding pairs of this subspecies in North America. Captive breeding plays a critical role in preventing the extirpation of this subspecies from its Canadian range. Unfortunately, high numbers of unexplained deaths among young birds in the captive breeding population threatened the success of this program. This paper describes fledgling mortality in the captive breeding population, and seeks to identify factors associated with fledgling survival and, ultimately, to identify steps to mitigate fledgling mortality. Results Over the study period (2006–2011) at two breeding sites, 696 LOSH were fledged. Among these, 68?% (n?=?474) were released, 10?% (n?=?69) were retained in the captive breeding population, and 22?% (n?=?155) died. Fledgling survival declined from 99?% in 2006 to 44?% in 2011. The odds of survival were significantly lower for fledglings that were part of a second clutch. As the number of fledglings in a clutch increased, the odds of surviving increased significantly. As the breeding female aged from one to four years of age, there was a marked increase in the odds of a fledgling surviving, which then subsequently declined as females aged further. Conclusions Based on our analyses, clutch number (first or second), number of fledglings in the brood, and age of breeding females were significant predictors of fledgling survival. Long-term breeding management decisions will have to balance the need to increase the number of individuals and breeding pairs in the wild by releasing large numbers of young, against the need to maintain a genetically viable captive population, until the wild population is large enough to be self-sustaining.
机译：背景东部亚种的Log头伯劳（Lanius ludovicianus ssp。）（LOSH）是原产于北美东部的掠食性鸣禽。据估计，在北美，该亚种的繁殖对少于55个。圈养繁殖在防止该亚种在加拿大范围内灭绝方面起着关键作用。不幸的是，圈养繁殖群体中幼鸟中大量无法解释的死亡威胁到该计划的成功。本文介绍了圈养繁殖种群中的雏鸟死亡率，并试图确定与雏鸟存活相关的因素，并最终确定减轻雏鸟死亡率的步骤。结果在研究期（2006-2011年）的两个繁殖场中，有696头LOSH出雏。其中，有68％（n == 474）被释放，10％（n == 69）被保留在繁殖种群中，有22％（n == 155）死亡。雏鸟的存活率从2006年的99％下降到2011年的44％。作为第二只离合器的一部分的雏鸟的存活几率显着降低。随着离合器中幼雏的数量增加，存活的几率显着增加。随着育种雌性的年龄从一岁到四岁，存活的几率显着增加，随后随着雌性年龄的增长而下降。结论根据我们的分析，离合器的数量（第一或第二），幼雏的数量和雌性的年龄是雏鸟存活的重要预测指标。长期的育种管理决策必须权衡通过释放大量幼体来增加野生个体和繁殖对数量的需要与维持遗传上可行的圈养种群的需要之间的平衡，直到野生种群足够大以至于自我维持。

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