...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Avian Biology >Variable reproductive effort for two ptarmigan species in response to spring weather in a northern alpine ecosystem
【24h】

Variable reproductive effort for two ptarmigan species in response to spring weather in a northern alpine ecosystem

机译：北部高山生态系统中两种雷鸟物种对春季天气变化的生殖力的变化

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

Predicting how animal populations respond to climate change requires knowledge of how species traits influence the response of individuals to variation in anuual weather. Over a four-year study with two warm and two cold years, we examined how sympatric rock ptarmigan Lagopus muta and white-tailed ptarmigan L. leucura in the southern Yukon Territory respond to spring weather in terms of breeding phenology and the allocation of reproductive effort. The onset of breeding was approximately synchronous; for each one-degree rise in spring temperature, mean breeding dates of rock and white-tailed ptarmigan advanced by about 2.7 and 4 days respectively. Although onset of breeding was similar, the two species differed in their reproductive effort. As breeding was delayed, average first clutch sizes of rock ptarmigan declined from 9.4 to 5.8 eggs over the breeding period, while those of white-tailed ptarmigan only declined from an average of 7.8 to 6.8. Rock ptarmigan were also less likely to re-nest if their first clutch was lost to predators and as a consequence they had shorter breeding seasons. White-tailed ptarmigan produced about 25% more offspring annually than rock ptarmigan and contributed more young through re-nesting. While white-tailed ptarmigan had higher annual reproductive output, adult rock ptarmigan had a 20-25% higher annual survival rate, which may indicate a reproduction-survival trade-off for the two species. These results show that even within the same location, closely related species can differ in how they allocate effort as environmental conditions fluctuate.
机译：预测动物种群如何应对气候变化，需要了解物种特征如何影响个体对日照天气变化的响应。在四年的研究中，有两个温暖的年份和两个寒冷的年份，我们考察了育空地区南部的同伴岩石雷鸟Lagopus muta和白尾雷鸟L. leucura在繁殖物候和生殖力分配方面如何响应春季天气。 。繁殖的开始大致是同步的。春季温度每升高1度，岩石和白尾雷鸟的平均繁殖日期分别提前2.7天和4天。尽管繁殖的开始相似，但这两个物种的繁殖力却有所不同。随着繁殖的延迟，雷鸟雷鸟的平均第一窝大小在繁殖期间从9.4降低到5.8，而白尾雷鸟的平均第一只抓住的鸡蛋从平均7.8降低到6.8。如果雷鸟的第一个离合器失去了捕食者的帮助，它们的巢雀也就不太可能了，因此繁殖季节更短。白尾雷鸟每年产生的后代比岩雷鸟多约25％，并且通过重新嵌套贡献了更多的幼鸟。白尾雷鸟的年繁殖量较高，成年岩雷鸟的年存活率高20-25％，这可能表明这两个物种在繁殖与生存之间进行权衡。这些结果表明，即使在同一地点，随着环境条件的变化，密切相关的物种在分配努力方面的方式也会有所不同。

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