...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The wilson journal of ornithology >HABITAT PREFERENCE AND SURVIVAL FOR WESTERN MEADOWLARK (STURNELLA NEGLECTA) FLEDGLINGS IN A CONTIGUOUS PRAIRIE SYSTEM
【24h】

HABITAT PREFERENCE AND SURVIVAL FOR WESTERN MEADOWLARK (STURNELLA NEGLECTA) FLEDGLINGS IN A CONTIGUOUS PRAIRIE SYSTEM

机译：连续大草原系统中西花ADO（Sturnella neglicta）幼雏的栖息地偏好和生存

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

Grassland bird populations in North America continue to decline according to count and vital-rate data, highlighting the importance of remaining grasslands. Conservation efforts may be enhanced by understanding fledgling habitat preference and survival in relation to age and ambient temperature. We radio-tracked 46 Western Meadowlark (Sturnella neglecta) fledglings in 2006 and 2007 to evaluate variation in habitat preference and survival in subirrigated meadows of the Nebraska Sandhills, one of North America's largest contiguous grassland systems. Our research indicates that habitat preference varied with fledgling age and ambient temperature: at higher ambient temperatures, fledglings tended to select sites with deeper litter and shorter vegetation, while younger, mostly flightless fledglings tended to select sites with shallower litter and taller vegetation. We confirmed 23 fatalities, including 8 (35%) from predators, 2 (9%) from haying operations, and 13 (56%) from unknown causes. Seven of the eight (88%) depredated fledglings were tracked to live snakes, including six bullsnakes (Pituophis catenifer sayi). The probability of daily survival (0.981) was high compared to estimates for passerine fledglings in other grassland systems. Survival increased with age and ambient temperature but decreased with litter depth. Prior research indicates prescribed burning can decrease litter depth and associated abundance of snakes in grasslands, but neither are likely conservation strategies in subirrigated meadows of the Nebraska Sandhills, because hay production provides winter feed for cattle. We recommend maintaining mid to late summer hay harvest so first cohorts of nestlings can fledge, attain flight, and evade machinery.
机译：根据数量和生命率数据，北美草原鸟类的数量持续减少，突显了剩余草原的重要性。通过了解与年龄和环境温度有关的雏鸟栖息地的偏好和生存，可以加强保护工作。我们在2006年和2007年用无线电跟踪了46只Western Meadowlark（Sturnella neglecta）幼雏，以评估内布拉斯加州沙丘（Nabraska Sandhills）（北美最大的连续草地系统之一）的灌溉草地上的栖息地偏好和生存变化。我们的研究表明，栖息地的偏好随雏龄和环境温度的变化而变化：在较高的环境温度下，雏鸟倾向于选择凋落物较深且植被较短的地点，而较年轻且大多为不飞行的雏鸟则倾向于选择凋落物较浅且植被较高的地点。我们确认了23例死亡，包括8例（35％）来自捕食者的死亡，2例（9％）来自干草的作业，以及13例（56％）来自未知原因的死亡。在八只过时的雏鸟中，有七只（88％）被追踪到活蛇，包括六只公牛（Pituophis catenifer sayi）。与其他草地系统中的雀形目幼雏相比，其每日生存的可能性较高（0.981）。存活率随着年龄和环境温度的增加而增加，但随垫料深度的增加而降低。先前的研究表明，规定的焚烧可以减少草地的枯枝落叶深度和相关的蛇的数量，但是在内布拉斯加州桑德希尔斯（Nabraska Sandhills）的灌溉草地上，这两种养护策略都不可行，因为干草的产生为牛提供了冬季饲料。我们建议保持夏季中旬至夏末的干草收成，以使第一批雏鸟能够立马，飞行并逃避机械。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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