...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecosphere >Extreme drought and adaptive resource selection by a desert mammal
【24h】

Extreme drought and adaptive resource selection by a desert mammal

机译：沙漠哺乳动物的极端干旱和自适应资源选择

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

When animals select areas to occupy, decisions involve trade‐offs between the fitness benefits of obtaining critical resources and minimizing costs of biotic and abiotic factors that constrain their use. These processes can be more dynamic and complex for species inhabiting desert environments, where highly variable spatial and temporal distribution of precipitation can create high intra‐ and inter‐annual variability in forage conditions and water availability, and thermal constraints can differ significantly among seasons and diel periods. We examined resource selection in desert bighorn sheep (Ovis canadensis mexicana ) in Cabeza Prieta National Wildlife Refuge, Arizona, USA, at multiple spatial and temporal scales to gain insight into how a desert mammal responds to variations in climatic conditions. We used resource selection functions to test topographic, forage, and environmental features among seasons and diel periods, and between non‐drought and drought conditions at the population and home‐range scale. When precipitation was average, sheep selected for topographic features that were beneficial for predator avoidance (i.e., escape terrain—steep, rugged areas with high visibility) and locations near perennial water. When drought occurred, they ranged further from preferred escape terrain and perennial water, perhaps seeking forage conditions suitable to meet their nutritional requirements. On early (April–June) and late (July–September) summer days, sheep selected for more northerly aspects and locations with lower solar radiation, and in some periods, selection for these cooler areas coincided with periods when forage covariates, proximity to perennial water, and several topographic features were uninformative in resource selection models. These choices may be necessary trade‐offs, foregoing good escape terrain and foraging areas, and access to water, for improved thermoregulation. This study highlights the importance of identifying resource selection at variable spatial and temporal scales when investigating the interrelationship between species and their environment. It provides insight into the dynamics of resource selection in desert mammals, and how they respond to constraints imposed on them by their environment. This work can serve to inform strategies for managing and conserving species living in arid environments when faced with climate change.
机译：当动物选择要占据的区域时，决定涉及获得关键资源的健身益处之间的权衡，并最大限度地减少限制其使用的生物和非生物因素的成本。这些过程对于居住的沙漠环境的物种可以更具动态和复杂的，其中降水的高度可变空间和时间分布可以在饲料条件和水可用性方面产生高的内部和年间变异性，并且在季节和DIEL中热约束可以显着差异。期间。我们在Cabeza Prieta国家野生动物避难所，美国亚利桑那州亚利桑那州的沙漠大角羊（ ovis canadensis墨西哥人）中审查了资源选择，以多种空间和时间秤，深入了解沙漠哺乳动物如何应对气候条件的变化。我们使用资源选择函数来测试季节和DIEL期间的地形，饲料和环境特征，以及人口和家庭范围规模的无干旱和干旱条件。当沉淀平均值时，为避免避免的地形特征选择绵羊（即，逃离地形 - 陡峭，具有高可见度的崎岖区域）和多年生水附近的位置。发生干旱时，他们进一步从优选的逃脱地形和多年生水中进行，也许寻求适合满足其营养要求的饲料条件。在早期（4月至6月）和夏天（7月至9月）夏天，绵羊选择了更多的北方太阳辐射的北方各个方面和地点，并且在某些时期，这些较冷却区域的选择与牧草协变量，接近多年生的时期相互作用水和若干地形特征在资源选择模型中是不知情的。这些选择可能是必要的权衡，前一种良好的逃避地形和觅食区域，以及进入水，以改善热调节。本研究突出了在调查物种与环境之间的相互关系时确定可变空间和时间尺度的资源选择的重要性。它提供了对沙漠哺乳动物中资源选择的动态的洞察力，以及如何应对其环境对他们的限制。这项工作可用于在面对气候变化时为在干旱环境中的管理和保存物种的战略提供信息。

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