丧失:人口减少和土地覆盖面的变化随着时间和空间的推移
Pamela R Narváez-Torres1, Nicola K Guthrie1, Typhenn A Brichieri-Colombi2
1Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada.
American journal of primatology
|March 11, 2024
概括
马达加斯加的土地覆盖面变化严重影响群,一些物种减少了80%. 退化息地对灵长类动物密度产生负面影响,突显了这些独特物种的紧急保护需求.
科学领域:
- 生态生态学 生态生态学
- 保护生物学 保护生物学
- 遥感 遥感 遥感 遥感
背景情况:
- 全球森林砍伐和息地退化威胁着生物多样性,特别是在热带和亚热带生态系统.
- 由于森林砍伐率高,马达加斯加的特有面临着人口减少和灭绝的高风险.
- 了解土地覆盖变化对灵长类种群的影响对于有效的保护至关重要.
研究的目的:
- 为了研究短期土地覆盖变化对马达加斯加东南部碎片化景观中的鱼物种密度的影响.
- 评估土地利用/土地覆盖 (LULC) 变化与人口动态之间的关系.
- 识别特定的土地覆盖类型,对类物种产生负面影响.
主要方法:
- 从2015年到2019年,每月进行线截面调查,以评估五个森林片段的密度.
- 土地使用/土地覆盖 (LULC) 地图每年使用Sentinel-2图像和监督分类生成.
- 在LULC地图上叠加了特定物种的缓冲器,以量化调查区域内的土地覆盖比例.
主要成果:
- 四种白日和白日物种的年密度大幅下降,其中一种物种 (Varecia variegata) 减少了80%.
- 两种夜间的密度下降,而其中一种 (Cheirogaleus major) 在2015年至2016年间增加了五倍.
- 到2019年,草原成为占主导地位的土地覆盖面 (50%),而成熟的农业用地显著增加. 退化的土地覆盖类型对三种虫物种产生了负面影响,尽管森林覆盖率较高与虫密度较高无关.
结论:
- 土地覆盖面的变化,特别是退化息地的增加,对马达加斯加的种群产生了重大负面影响.
- 不同的鱼物种对息地修改的多样性反应强调了保护挑战的复杂性.
- 应对土地利用变化的紧急干预措施和有针对性的保护战略对于缓解种群减少至关重要.
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