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Old 10-25-2010, 10:56 AM   #1
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Default Nature and Humans Leaving Indelible Mark on Rivers, Harming the Intricate Food Webs They Support

Nature and Humans Leaving Indelible Mark on Rivers, Harming the Intricate Food Webs They Support
ScienceDaily
Oct. 14, 2010

Nature and humans leaving indelible mark on rivers, harming the intricate food webs they support
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"Floods and droughts shorten the food chain but they accomplish this in different ways," said John Sabo, an Arizona State University associate professor in the School of Life Sciences. Sabo is the lead author of the paper, "The Role of Discharge Variation in Scaling of Drainage Area and Food Chain Length in Rivers," which appeared Oct. 15, 2010, in Science Express, the online, early publication venue for the journal Science.

"High flows take out the middle men in the food web making fish (the top predator) feed lower in the food chain; droughts completely knock out the top predator. The end result in either case is a simpler food web, but the effects we see for low flows are more catastrophic for fish, and much more long lasting," said Sabo, who...
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