...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Biological Conservation >Survival, dispersal and early migration movements of captive-bred juvenile eastern loggerhead shrikes (Lanius ludovicianus migrans).
【24h】

Survival, dispersal and early migration movements of captive-bred juvenile eastern loggerhead shrikes (Lanius ludovicianus migrans).

机译：圈养的东部东部小（Shanis shrikes）的生存，散布和早期迁徙运动（i。Lanius ludovicianus migrans ）。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Avian captive breeding programs pose a particular challenge with migratory birds due to natal dispersal and high mortality during migration. In Canada a captive breeding program for the eastern loggerhead shrike (Lanius ludovicianus migrans) has released over 400 juveniles since 2001, but the fate of almost all these birds is unknown. In 2007 and 2008, we used radio-telemetry of captive-reared juveniles to determine pre-migration survival and dispersal movements away from the release site. Overall, 76% (29 of 38) of shrikes survived from release to the initiation of migration and the daily survival rate was 0.987. Most deaths (78%) occurred in females, suggesting a possible sex-biased pre-migration mortality. Shrikes typically dispersed independently, there was little overlap between dispersal sites, and the average pre-migration dispersal distance from the release site was 4.2 km (SD 2.4). Release date was negatively correlated with time spent at the release site prior to dispersal, but did not have a significant effect on survival, time spent at dispersal sites or distance of dispersal. Migration initiation date ranged over 6 weeks and early-hatched juveniles were the first to begin migration. Using aerial telemetry, we located five of 29 birds that had begun migration at distances up to 180 km from the release site; no birds were found dead after initiating migration despite the extensive search area. High juvenile survival to migration for captive-reared juveniles suggests that the captive breeding and release program has high potential to augment wild populations of the eastern loggerhead shrike.Digital Object Identifier http://dx.doi.org/10.1016/j.biocon.2010.06.027
机译：鸟类圈养繁殖计划对候鸟构成了特殊的挑战，原因是其出生时的扩散和迁徙期间的高死亡率。在加拿大，自2001年以来，东部鸟（ Lanius ludovicianus migrans ）的繁殖计划已经释放了400多只幼鸟，但是几乎所有这些鸟的命运都是未知的。在2007年和2008年，我们用无线电遥测圈养的未成年幼鸟来确定迁徙前的生存和远离释放地点的扩散运动。总体而言，从释放到迁移开始，幸存者中有76％（38个中的29个）幸存下来，每日生存率为0.987。大多数死亡（78％）发生在女性中，这表明可能存在性别偏见的移民前死亡率。 rik怪通常独立地散布，散布点之间几乎没有重叠，并且离释放点的平均迁移前散布距离为4.2 km（SD 2.4）。释放日期与在分散之前在释放部位花费的时间呈负相关，但对存活率，在分散部位花费的时间或分散距离没有显着影响。移徙的起始日期超过6周，早孵的幼体是第一个开始移徙的人。利用空中遥测技术，我们找到了29只禽中的5只，它们已经开始迁移，离释放地点的距离最大为180公里;尽管搜寻范围广泛，但在开始迁徙后仍未发现鸟类死亡。圈养繁殖的幼鱼的高成年存活率表明，圈养繁殖和释放计划具有增加东部黑head伯劳野生种群的潜力。数字对象标识符http://dx.doi.org/10.1016/j.biocon。 2010.06.027

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号