加纳森林-稀树草原过渡带森林破碎特征对疣体丰度的影响。

Bright O Kankam, Pascale Sicotte
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引用次数: 20

摘要

本文探讨了加纳森林-稀树草原过渡带11个森林碎片[Boabeng-Fiema猴保护区和周边9个森林碎片(范围:3.2-190 ha)]中疣猴丰度的影响因素。我们使用“完整”计数对碎片中的疣体进行普查。我们利用地理信息系统方法确定了碎片大小,并评估了森林碎片质量(树种丰富度)。4个森林片段中没有疣虫个体,7个片段中有疣虫个体(密度为0.13个/ha ~ 1.63个/ha)。我们使用泊松回归建模疣体密度,并根据修正的赤池信息准则模型权重选择模型。碎片大小和物种丰富度与疣体密度呈正相关,而森林碎片的隔离距离(范围:20 ~ 5632 m)与疣体密度呈负相关。我们的分析表明,碎片与Boabeng之间的隔离距离确实阻碍了疣体的运动。随着Boabeng和Fiema疣猴种群的增加,一些空置的碎片可能对分散的猴子更具吸引力。旨在增加碎片内树种丰富度的管理措施,同时在碎片之间保持一些大型树木,可能有助于增加一些目前没有永久疣虫群的碎片的占用率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of forest fragment characteristics on abundance of Colobus vellerosus in the forest-savanna transition zone of Ghana.

We explore the factors influencing the abundance of Colobus vellerosus in 11 forest fragments [Boabeng-Fiema Monkey Sanctuary and 9 surrounding forest fragments (range: 3.2-190 ha)] in the forest-savanna transition zone of Ghana. We used a 'complete' count for the colobus census in the fragments. We determined the fragment sizes using geographic information system methods and assessed forest fragment quality (tree species richness). Colobus individuals were absent from 4 forest fragments but present in 7 (densities of 0.13/ha-1.63/ha). We modelled colobus density using Poisson regression and selected models based on corrected Akaike information criterion model weights. Fragment size and tree species richness in the fragments were positively associated with colobus density, whereas isolation distance of the forest fragments (range: 20-5,632 m) was negatively associated with colobus density. Our analysis suggests that the isolation distance between the fragments and Boabeng does impede colobus movement. As the colobus populations in Boabeng and Fiema increase, some of the unoccupied fragments may become more attractive to dispersing monkeys. Management measures that aim at increasing tree species richness within fragments, while maintaining some large trees between fragments, might help to increase the occupancy of some of the fragments that currently have no permanent colobus groups.

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