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首页> 外文期刊>Chelonian conservation and biology >Microhabitat Selection of Juvenile Sonoran Desert Tortoises (Gopherus morafkai) in Central Arizona
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Microhabitat Selection of Juvenile Sonoran Desert Tortoises (Gopherus morafkai) in Central Arizona

机译：亚利桑那州中部索诺兰沙漠乌龟（Gopherus morafkai）的微生境选择

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摘要

Sonoran Desert Tortoise (SDT; Gopherus morafkai) populations face threats from habitat loss and fragmentation. Effective management of SDTs in Arizona will require an understanding of the species' age-related habitat needs; however, no published research addresses habitat selection and use in juvenile SDTs. We investigated microhabitat selection of juvenile SDTs in the Mazatzal Mountains in central Arizona. Eleven juvenile SDTs were tracked with radiotelemetry from April 2010 to December 2011. To determine habitat selection, we compared microhabitat characteristics from 117 tracked-tortoise locations to an equal number of random locations during 2 seasons. The summer monsoon (July to September) was the season of greatest SDT activity, whereas winter (December to February) was a season of relative inactivity and hibernation. We found that juvenile SDTs selected enclosed shelters on rocky hillsides with high proportions of boulders and annual vegetation during summer monsoon, and enclosed shelters on steep slopes with a high amount of leaf litter during winter hibernation. Microhabitat selection by juvenile SDTs allowed us to develop a habitat suitability model in a geographic information system (GIS); our model correctly predicted 82% of juvenile tortoise locations in suitable habitat at our site. Results from this study, the first of its kind in the Sonoran Desert, identify key habitat features selected by juvenile SDTs in central Arizona and provide a framework to develop GIS tools to predict juvenile tortoise habitat.
机译：索诺兰沙漠龟（SDT; Gopherus morafkai）种群面临栖息地丧失和破碎化的威胁。要在亚利桑那州有效管理SDT，就需要了解该物种与年龄相关的栖息地需求；但是，尚无公开的研究涉及青少年SDT中栖息地的选择和使用。我们调查了亚利桑那州中部马萨茨山脉中青少年SDT的微生境选择。从2010年4月至2011年12月，采用无线电遥测技术跟踪了11个少年SDT。为了确定栖息地的选择，我们比较了两个季节中117个被跟踪的乌龟与相同数量的随机地点的微生境特征。夏季季风（7月至9月）是SDT活动最旺盛的季节，而冬季（12月至2月）是相对不活跃和冬眠的季节。我们发现，青少年SDT在夏季风期间选择了在岩石山坡上有大量砾石和一年生植被的封闭式避难所，并在冬季冬眠期间选择了在具有大量落叶的陡坡上的封闭式避难所。少年SDT对微生境的选择使我们能够在地理信息系统（GIS）中开发生境适宜性模型；我们的模型正确预测了我们站点合适栖息地中82％的幼龟位置。这项研究的结果是索诺兰沙漠中的首次此类研究，它确定了亚利桑那州中部的青少年SDT选择的关键栖息地特征，并提供了开发GIS工具以预测少年乌龟栖息地的框架。

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