...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Southeastern naturalist >Sources of Variation in the Abundance and Detection of the Endangered Florida Grasshopper Sparrow
【24h】

Sources of Variation in the Abundance and Detection of the Endangered Florida Grasshopper Sparrow

机译：濒临灭绝的佛罗里达蚱Grass麻雀的丰度和检测变化的来源

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

Information on factors affecting the abundance and detection of the endangered Ammodramus savannarum floridanus (Florida Grasshopper Sparrow) was required to determine appropriate management strategies and evaluate monitoring efforts. We examined annual point-count data, records of prescribed fire (2003–2008), observer variability, and landscape features for Three Lakes Wildlife Management Area to identify sources of variation in abundance and detection. The population of male Florida Grasshopper Sparrows was estimated to be 498 (95% CL = 354–641), which corresponded to 23.9 (95% CL = 17.0–30.7) males per km~2. Over most or all observed covariate ranges, abundance estimates increased with mean elevation above sea level, distance from outer edge of optimal habitat, and with growing-season burns (P ≤ 0.025). Abundance declined with time since last burn (P ≤ 0.006). Estimates of probability of detection ranged from 0.041 to 0.101, depending on observer and prior detections. Probability of detection declined with time of day, day of year, and days since last burn (P ≤ 0.058). The current prairie burn regime of 2- to 3-year intervals should be maintained with preference for increased growing-season burns. Annual point-count surveys should be continued. Surveys should be conducted within 2 hours of sunrise between mid-April and mid-May. Future monitoring should incorporate covariates of abundance and detection during the collection of data and in their analysis for population estimates used for recovery criteria.
机译：需要信息以了解影响濒临灭绝的沙门氏菌（佛罗里达蚱F麻雀）的数量和检测的因素，以确定适当的管理策略并评估监测工作。我们检查了三湖野生动物管理区的年度点数数据，指定的火灾记录（2003-2008年），观察员变化和景观特征，以识别丰度和探测变化的来源。据估计，雄性佛罗里达蚱Sp麻雀的数量为498（95％CL = 354–641），相当于每平方公里2的雄性23.9（95％CL = 17.0–30.7）。在大多数或所有观察到的协变量范围内，丰度估计值随海平面以上的平均海拔，距最佳栖息地外缘的距离以及生长季节的灼伤而增加（P≤0.025）。自上次烧伤以来，丰度随时间下降（P≤0.006）。根据观察者和先前的检测结果，检测概率的估计值范围为0.041至0.101。检测的概率随一天中的时间，一年中的一天以及自上次灼伤以来的天数而降低（P≤0.058）。应维持目前的2至3年间隔的草原烧伤制度，并优先考虑增加季节性烧伤。年度点数调查应继续进行。应在4月中旬至5月中旬的日出前2小时内进行调查。未来的监测应在数据收集过程中以及在其用于恢复标准的人口估计分析中纳入丰度和检测的协变量。

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