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Recruitment of juvenile, captive-reared eastern loggerhead shrikes Lanius ludovicianus migrans into the wild population in Canada

机译:招募幼年,人工饲养的东部鱼Lanius ludovicianus migrans进入加拿大的野外种群

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High post-release survival, low dispersal and the recruitment of captive-reared individuals into the wild population are critical to the success of any reintroduction programme. Reintroducing a migratory species poses an additional challenge as success also depends on the return of captive-reared individuals to breeding grounds in subsequent years. We investigated the effects of seven husbandry and management factors on the return rate of captive-reared eastern loggerhead shrikes Lanius ludovicianus migrans and documented the recruitment of returning individuals. During 2004-2010, 564 juveniles were released in Ontario, Canada, as part of a field propagation and release programme and there were 27 confirmed sightings of returning birds during 2005-2011. Returning birds were significantly more likely to have been released in large groups of juveniles (9-10 birds) at 5.5 weeks post-fledging from the Carden field propagation site. Comparisons of the number of young fledged and survival to 2 weeks post-fledging revealed similar results for pairs comprising one captive-reared and one wild-reared individual and pairs comprising two wild individuals. These results highlight the contribution of captive-reared shrikes to the recovery of the wild population and the importance of monitoring outcomes and evaluating techniques.
机译:释放后的高存活率,低扩散和将人工饲养的个体招募到野生种群中对于任何重新引入计划的成功都是至关重要的。重新引进迁徙物种构成了另一项挑战,因为成功还取决于被圈养的个体在随后几年中返回繁殖地。我们调查了七个饲养和管理因素对圈养的东部牛(Lanius ludovicianus migrans)返乡率的影响,并记录了返乡人员的募集情况。在2004年至2010年期间,作为野外繁殖和释放计划的一部分,在加拿大安大略省释放了564只幼鸟,在2005年至2011年期间,已确认目击了27只返回的鸟类。从Carden田间繁殖地点出雏后5.5周,返回的鸟类更有可能在成年幼体(9-10羽)中被释放。幼雏的数量和成雏后2周的存活率的比较显示,对包括一个圈养和一个野生饲养个体的配对以及包括两个野生个体的配对相似的结果。这些结果凸显了圈养的sh鱼对野生种群恢复的贡献以及监测结果和评估技术的重要性。

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