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Evaluating population connectivity and targeting conservation action for an endangered cat
Ecosphere ( IF 2.7 ) Pub Date : 2021-02-09 , DOI: 10.1002/ecs2.3367
Sarah E. Lehnen 1 , Mitch A. Sternberg 2 , Hilary M. Swarts 3 , Steven E. Sesnie 1
Affiliation  

Dispersal of animals among populations helps to increase genetic variability and population viability. The endangered ocelot (Leopardus pardalis) in south Texas persists in two small populations separated by 30 km and cutoff from populations in northeastern Mexico. Despite the relatively short distance separating the two south Texas populations, movement between them has been limited, leading researchers to believe landscape connectivity is poor in the region. We developed habitat suitability maps using remote sensing and GPS‐collared ocelots and ran connectivity analyses to assess current habitat linkages, important areas for conservation, and areas where connectivity could be improved through habitat restoration. First, we developed a resource selection function using random forest models and GPS data from ten ocelots collared at Laguna Atascosa National Wildlife Refuge combined with spatial layers derived from LiDAR and remotely sensed imagery. We then used these results as the basis for a cost surface layer. Using this layer, we examined habitat connectivity using least‐cost and circuit theory methods. We evaluated linkages by cost of movement, identified areas important for maintaining existing connectivity, and ranked areas where restoration would have the greatest benefit to connectivity. We found that core habitats within the two populations were relatively well connected but connectivity between the two populations was poor. By identifying areas currently important for connectivity and areas with the greatest benefit to ocelots if restored, these results will help inform land acquisition and restoration planning to improve ocelot conservation in south Texas.

中文翻译:

评估人口连通性并针对濒临灭绝的猫采取保护行动

将动物分散在种群中有助于增加遗传变异性和种群生存力。濒临灭绝的豹Leopardus pardalis)在得克萨斯州南部的两个小种群中仍然存在,相隔30公里,与墨西哥东北部的种群隔离开来。尽管两个德克萨斯州南部人口之间的距离相对较短,但它们之间的移动受到了限制,导致研究人员认为该地区的景观连通性很差。我们使用遥感和GPS领口的鳄鱼开发了栖息地适宜性地图,并进行了连通性分析,以评估当前的栖息地联系,重要的保护区以及可以通过栖息地恢复改善连通性的区域。首先,我们使用随机森林模型和来自拉古纳·阿塔斯科萨国家野生动物保护区的十只圈颈圈的GPS数据,结合来自LiDAR和遥感影像的空间层,开发了资源选择功能。然后,我们将这些结果用作成本表层的基础。在这一层,我们使用最小成本和电路理论方法研究了栖息地的连通性。我们通过移动成本评估了链接,确定了对维持现有连接至关重要的区域,并对恢复对连接最大益处的区域进行了排名。我们发现,两个种群中的核心栖息地之间的联系相对良好,但是两个种群之间的联系较差。通过确定当前对于连通性很重要的区域以及如果恢复将对鹰嘴兽最大的收益,这些结果将有助于为土地收购和恢复计划提供信息,以改善德克萨斯州南部的豹猫保护。我们通过移动成本评估了链接,确定了对维持现有连接至关重要的区域,并对恢复对连接最大益处的区域进行了排名。我们发现,两个种群中的核心栖息地之间的联系相对良好,但是两个种群之间的联系较差。通过确定当前对于连通性很重要的区域以及如果恢复将对鹰嘴兽最大的收益,这些结果将有助于为土地收购和恢复计划提供信息,以改善德克萨斯州南部的豹猫保护。我们通过移动成本评估了链接,确定了对维持现有连接至关重要的区域,并对恢复对连接最大益处的区域进行了排名。我们发现,两个种群中的核心栖息地之间的联系相对良好,但是两个种群之间的联系较差。通过确定当前对于连通性很重要的区域以及如果恢复将对鹰嘴兽最大的收益,这些结果将有助于为土地收购和恢复计划提供信息,以改善德克萨斯州南部的豹猫保护。我们发现,两个种群中的核心栖息地之间的联系相对良好,但是两个种群之间的联系较差。通过确定当前对连通性很重要的区域以及如果恢复将对鹰嘴兽最大的收益,这些结果将有助于为土地收购和恢复计划提供信息,以改善德克萨斯州南部的豹猫保护。我们发现,两个种群中的核心栖息地之间的联系相对良好,但是两个种群之间的联系较差。通过确定当前对连通性很重要的区域以及如果恢复将对鹰嘴兽最大的收益,这些结果将有助于为土地收购和恢复计划提供信息,以改善德克萨斯州南部的豹猫保护。
更新日期:2021-02-09
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