River Food Webs Threatened by Widespread Hydropower Practice (2 of 3) (IMAGE)
Caption
Emergent rocks (pictured) are critical egg laying sites for aquatic insects. Hydropeaking operations at Glen Canyon Dam create artificial tides along river shorelines to which freshwater organisms are not adapted. If water levels rapidly drop and expose the eggs, they can dry out and die before hatching.
The decline of aquatic insects downstream from some hydroelectric dams has been linked to a widespread practice known as hydropeaking, whereby river flows are increased during the day when electricity demands are large, according to a new study led by the US Geological Survey, along with researchers from Oregon State University, Utah State University and Idaho State University. Findings show it may be possible to mitigate these negative effects by using alternative hydropower practices.
Credit
David Herasimtschuk © Freshwaters Illustrated
Usage Restrictions
Credit David Herasimtschuk © Freshwaters Illustrated
License
Licensed content