Fragmentation and Flow Regulation of the World's Large River Systems

@article{Nilsson2005FragmentationAF,
  title={Fragmentation and Flow Regulation of the World's Large River Systems},
  author={Christer Nilsson and Cathy Reidy and Mats Dynesius and Carmen Revenga},
  journal={Science},
  year={2005},
  volume={308},
  pages={405 - 408}
}
A global overview of dam-based impacts on large river systems shows that over half (172 out of 292) are affected by dams, including the eight most biogeographically diverse. Dam-impacted catchments experience higher irrigation pressure and about 25 times more economic activity per unit of water than do unaffected catchments. In view of projected changes in climate and water resource use, these findings can be used to identify ecological risks associated with further impacts on large river… 
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References

SHOWING 1-10 OF 34 REFERENCES

Alterations of Riparian Ecosystems Caused by River Regulation

An estimated two-thirds of the fresh water flowing to the oceans is obstructed by approximately 40,000 large dams (defined as more than 15 m in height) and more than 800,000 smaller ones (Petts 1984,…

THE NATURAL FLOW REGIME. A PARADIGM FOR RIVER CONSERVATION AND RESTORATION

H umans have long been fascinated by the dynamism of free-flowing waters. Yet we have expended great effort to tame rivers for transportation, water supply, flood control, agriculture, and power…

Fragmentation and Flow Regulation of River Systems in the Northern Third of the World

To improve the conservation of biodiversity and the sustainable use of biological resources, immediate action is called for to create an international preservation network of free-flowing river systems and to rehabilitate exploited rivers in areas that lack unaffected watercourses.

Fragmentation of riparian floras in rivers with multiple dams

Rivers are increasingly fragmented by dams, resulting in disruption of natural dispersal pathways and subsequent changes of riverine communities. We assessed the effect of dams as barriers to plant…

Restoring Ice-jam Floodwater to a Drying Delta Ecosystem

Abstract Overbank flooding is essential to the ecological health of riparian landscapes, particularly river deltas. One of the world's largest freshwater deltas, the Peace-Athabasca Delta (PAD) in…

Effect of Danube River dam on Black Sea biogeochemistry and ecosystem structure

Rivers contribute significantly to the pollution and eutrophication that have caused drastic changes to the ecosystem of the Black Sea1–3. Although damming is known to affect riverborne nutrient…

Riverine flood plains: present state and future trends

Natural flood plains are among the most biologically productive and diverse ecosystems on earth. Globally, riverine flood plains cover > 2 × 106 km2, however, they are among the most threatened…

Irrigated Agriculture and Wildlife Conservation: Conflict on a Global Scale

To reverse this trend, land and water managers and policy makers must assess the true economic costs of wetland loss and use the information as a basis for establishing legally enforceable water rights that protect wetlands from agricultural development.

Changes in fish communities of the Shoalhaven River 20 years after construction of Tallowa Dam, Australia

This study was undertaken as part of a long‐term investigation of the ability of high‐level fishways to rehabilitate fish communities upstream of high dams. Effects of Tallowa Dam on fish of the…

Biodiversity hotspots for conservation priorities

A ‘silver bullet’ strategy on the part of conservation planners, focusing on ‘biodiversity hotspots’ where exceptional concentrations of endemic species are undergoing exceptional loss of habitat, is proposed.