• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ethology >Are the Costs of Site Unfamiliarity Compensated With Vigilance? A Field Test in Eurasian Siskins
【24h】

Are the Costs of Site Unfamiliarity Compensated With Vigilance? A Field Test in Eurasian Siskins

机译：站点不熟悉的成本是否可以通过警惕得到补偿？欧亚Siskins的现场测试

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

Determination of fitness differentials between individuals adopting different migratory and dispersal strategies is basic to understand the evolution of migration. In the Eurasian siskin Carduelis spinus, both resident and transient birds forage within the same wintering area, providing the rare opportunity to compare their foraging behaviour in the same area and habitat. The aim of this study was to test the predictions associated to the different hypothesized costs of transience by studying the vigilance and foraging behaviour of wild wintering siskins foraging at three bird tables with different predation risk and interference competition levels. Transient siskins showed longer scan durations than residents, either because of site unfamiliarity or subordination (i.e. prior-occupancy effect). However, residents and transients did not differ in aggression rates, contrary to the dear-enemy effect. Transient siskins did not show a higher allocation of time to vigilance, contrary to the hypothesis of compensation vigilance to reduce predation risk by dispersing animals. Moreover, transients increased pecking rate with increasing predation risk, showed lower scan rates, longer foraging bouts and, in males, presented marginally higher proportions far from cover. Altogether these results strongly support the hypothesis that transients incur a predation cost due to a less efficient vigilance and foraging system
机译：确定采用不同迁移和分散策略的个体之间的适应性差异是了解迁移演变的基础。在欧亚siskin Carduelis spinus中，常驻鸟类和短暂鸟类都在同一越冬区域内觅食，这提供了难得的机会来比较它们在相同区域和栖息地的觅食行为。这项研究的目的是通过研究在三个具有不同捕食风险和干扰竞争水平的鸟类餐桌上的野生越冬siskins觅食的警惕性和觅食行为，来检验与不同的暂定成本相关的预测。暂时性siskins显示扫描持续时间比居民长，这是因为地点不熟悉或从属（即先前居住的影响）。但是，与亲爱的敌人效应相反，居民和瞬态分子的攻击率没有差异。暂时性siskins没有表现出更高的时间分配警惕性，这与补偿警惕性通过分散动物来降低捕食风险的假设相反。此外，瞬态随啄食风险的增加而增加啄食率，显示出较低的扫描率，较长的觅食回旋，并且在男性中，隐蔽率远高于掩盖率。总而言之，这些结果有力地支持了以下假设：由于较低的警惕性和觅食系统，瞬态会导致掠夺成本

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