globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0101657
论文题名:
Habitat Fragmentation and Species Extirpation in Freshwater Ecosystems; Causes of Range Decline of the Indus River Dolphin (Platanista gangetica minor)
作者: Gill T. Braulik; Masood Arshad; Uzma Noureen; Simon P. Northridge
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2014
发表日期: 2014-7-16
卷: 9, 期:7
语种: 英语
英文关键词: Dolphins ; Rivers ; Surface water ; Fresh water ; Water pollution ; Species extinction ; Biodiversity ; Habitats
英文摘要: Habitat fragmentation of freshwater ecosystems is increasing rapidly, however the understanding of extinction debt and species decline in riverine habitat fragments lags behind that in other ecosystems. The mighty rivers that drain the Himalaya - the Ganges, Brahmaputra, Indus, Mekong and Yangtze - are amongst the world’s most biodiverse freshwater ecosystems. Many hundreds of dams have been constructed, are under construction, or are planned on these rivers and large hydrological changes and losses of biodiversity have occurred and are expected to continue. This study examines the causes of range decline of the Indus dolphin, which inhabits one of the world’s most modified rivers, to demonstrate how we may expect other vertebrate populations to respond as planned dams and water developments come into operation. The historical range of the Indus dolphin has been fragmented into 17 river sections by diversion dams; dolphin sighting and interview surveys show that river dolphins have been extirpated from ten river sections, they persist in 6, and are of unknown status in one section. Seven potential factors influencing the temporal and spatial pattern of decline were considered in three regression model sets. Low dry-season river discharge, due to water abstraction at irrigation barrages, was the principal factor that explained the dolphin’s range decline, influencing 1) the spatial pattern of persistence, 2) the temporal pattern of subpopulation extirpation, and 3) the speed of extirpation after habitat fragmentation. Dolphins were more likely to persist in the core of the former range because water diversions are concentrated near the range periphery. Habitat fragmentation and degradation of the habitat were inextricably intertwined and in combination caused the catastrophic decline of the Indus dolphin.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0101657&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/18155
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews, Fife, United Kingdom;World Wildlife Fund-Pakistan, Lahore, Pakistan;Wildlife Conservation Society, Zanzibar, United Republic of Tanzania;World Wildlife Fund-Pakistan, Lahore, Pakistan;World Wildlife Fund-Pakistan, Lahore, Pakistan;Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews, Fife, United Kingdom

Recommended Citation:
Gill T. Braulik,Masood Arshad,Uzma Noureen,et al. Habitat Fragmentation and Species Extirpation in Freshwater Ecosystems; Causes of Range Decline of the Indus River Dolphin (Platanista gangetica minor)[J]. PLOS ONE,2014-01-01,9(7)
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