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首页> 外文期刊>Bothalia: African Biodiversity & Conservation >Assessing habitat fragmentation of the KwaZulu-Natal Sandstone Sourveld, a threatened ecosystem
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Assessing habitat fragmentation of the KwaZulu-Natal Sandstone Sourveld, a threatened ecosystem

机译：评估KwaZulu-Natal砂岩Sourveld（一个受到威胁的生态系统）的栖息地碎片

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Background: The KwaZulu-Natal Sandstone Sourveld (KZN SS) is a grassland ecosystem categorised as endangered by the terms of the National Environmental Management: Biodiversity Act (Act 10 of 2004). Pressure from urbanisation has led to the remaining areas of the KZN SS being physically fragmented, causing low connectivity levels which have diminished the biological persistence of this ecosystem.Objectives: This study aimed to quantify the overall level of habitat fragmentation of the KZN SS and determine the level of connectivity within the ecosystem, and patches of the KZN SS occurring in the eThekwini Municipal area. Using graph theory, we compared the effectiveness of broad-scale and fine-scale data sets in quantifying habitat fragmentation.Methods: The Conefor Sensinode software, which employs the bases of graph theory, was chosen to aid in assessing fragmentation levels. The integral index of connectivity (IIC) (values range from 0 to 1, with 1 highlighting optimal connectivity) was chosen as the best index to determine landscape connectivity.Results: The KZN SS was shown to be highly fragmented, especially at dispersal distances less than 500 m. This resulted in very low connectivity levels, with the highest IIC value recorded at 0.0063. Moreover, the use of either fine-scale or broad-scale data to measure connectivity differed substantially at 1000 m.Conclusion: Broad-scale data were shown to overestimate habitat fragmentation and underestimate landscape connectivity. A more apt description of KZN SS connectivity levels was realised with fine-scale data. This study recommends that crucial KZN SS patches be prioritised to safeguard this endangered ecosystem.
机译：背景：夸祖鲁-纳塔尔砂岩（KZN SS）是一种草原生态系统，被《国家环境管理：生物多样性法》（2004年第10号法案）的条款列为濒危物种。城市化带来的压力导致KZN SS的其余区域在物理上处于零散状态，导致连接水平较低，从而削弱了该生态系统的生物持久性。目的：本研究旨在量化KZN SS的生境破碎化的总体水平并确定生态系统内的连通性水平，以及在eThekwini市辖区发生的KZN SS斑块。使用图论，我们比较了大规模和精细数据集在量化栖息地碎片化方面的有效性。方法：选择采用图论基础的Conefor Sensinode软件来帮助评估碎片化水平。连接性积分指数（IIC）（值的范围从0到1，其中1表示最佳连接性）被选为确定景观连接性的最佳指数。结果：KZN SS被显示为高度碎片化，尤其是在分散距离较小的情况下超过500 m。这导致非常低的连接级别，最高IIC值记录为0.0063。此外，在1000 m处使用精细数据或大规模数据来测量连通性存在很大差异。结论：大规模数据显示过高估计了生境破碎化和低估了景观连通性。使用精细数据实现了对KZN SS连接级别的更恰当的描述。这项研究建议优先考虑关键的KZN SS补丁，以保护这一濒临灭绝的生态系统。

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