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加纳莫尔国家公园大象的季节性栖息地利用情况

Seasonal habitat use by Elephants () in the Mole National Park of Ghana.

作者信息

Ashiagbor George, Danquah Emmanuel

机构信息

Department of Wildlife and Range Management Kwame Nkrumah University of Science and Technology Kumasi Ghana.

出版信息

Ecol Evol. 2017 Apr 18;7(11):3784-3795. doi: 10.1002/ece3.2962. eCollection 2017 Jun.

Abstract

To avoid unnecessary waste of limited resources and to help prioritize areas for conservation efforts, this study aimed to provide information on habitat use by elephants between the wet and dry seasons in the Mole National Park (MNP) of Ghana. We compiled coordinates of 516 locations of elephants' encounters, 256 for dry season and 260 for wet season. Using nine predictor variables, we modeled the probability of elephant's distribution in MNP. We threshold the models to "suitable" and "nonsuitable" regions of habitat use using the equal training sensitivity and specificity values of 0.177 and 0.181 for the dry and wet seasons, respectively. Accuracy assessment of our models revealed a sensitivity score of 0.909 and 0.974, and a specificity of 0.579 and 0.753 for the dry and wet seasons, respectively. A TSS of 0.488 was also recorded for the dry season and 0.727 for the wet season indicating a good model agreement. Our model predicts habitat use to be confined to the southern portion of MNP due to elevation difference and a relatively steep slope that separates the northern regions of the park from the south. Regions of habitat use for the wet season were 856 km and reduced significantly to 547.68 km in the dry season. We observed significant overlap (327.24 km) in habitat use regions between the wet and dry seasons (Schoener's D = 0.922 and Hellinger's-based I = 0.991). DEM, proximity to waterholes, and saltlicks were identified as the key variables that contributed to the prediction. We recommend construction of temporal camps in regions of habitat use that are far from the headquarters area for effective management of elephants. Also, an increase in water point's density around the headquarters areas and selected dry areas of the park will further decrease elephant's range and hence a relatively less resource use in monitoring and patrols.

摘要

为避免有限资源的不必要浪费,并帮助确定保护工作的重点区域,本研究旨在提供加纳莫尔国家公园(MNP)大象在雨季和旱季栖息地使用情况的信息。我们汇总了516个大象出没地点的坐标,其中旱季256个,雨季260个。我们使用九个预测变量,对大象在莫尔国家公园分布的概率进行建模。我们分别使用旱季和雨季相等的训练敏感度值0.177和特异度值0.181,将模型阈值设定为栖息地使用的“适宜”和“非适宜”区域。对我们模型的准确性评估显示,旱季的敏感度得分分别为0.909和特异度为0.579,雨季的敏感度得分分别为0.974和特异度为0.753。旱季还记录到TSS为0.488,雨季为0.727,表明模型一致性良好。由于海拔差异以及将公园北部与南部分开的相对陡坡,我们的模型预测栖息地使用局限于莫尔国家公园的南部。雨季的栖息地使用区域为856公里,旱季显著减少至仅547.68公里。我们观察到雨季和旱季栖息地使用区域存在显著重叠(327.24公里)(Schoener's D = 0.922和基于Hellinger的I = 0.991)。数字高程模型(DEM)、与水坑的距离以及盐碱地被确定为有助于预测的关键变量。我们建议在远离总部区域的栖息地使用区域建造临时营地,以有效管理大象。此外,在公园总部区域和选定的干旱区域周围增加水源点的密度,将进一步缩小大象的活动范围,从而在监测和巡逻中减少资源使用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9328/5468139/f3d26dba1f2f/ECE3-7-3784-g001.jpg

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