True Cost of Reservoirs: What happens to the aquatic fauna? Judy Takats Senior Program Officer World Wildlife Fund Saturday, 27 February 2010.

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Presentation transcript:

True Cost of Reservoirs: What happens to the aquatic fauna? Judy Takats Senior Program Officer World Wildlife Fund Saturday, 27 February 2010

Who is WWF? An international conservation organization that is supported by almost 5 million members globally, 1.2 million members in the United States and over 110,000 in the Southeast Rivers and Streams ecoregion.

The diversity of life isn't evenly distributed around the globe. It is concentrated in certain areas, making them a greater priority for conservation. Places of Focus Goal: By 2020, WWF will conserve 19 of the world's most important natural places and significantly change global markets to protect the future of nature. Places of Focus Amazon Coral Triangle Madagascar Alabama + Tennessee = 70.9% area About 10.8 million people rely on the waters – projected to grow 266,483 km 2 (102,890 mi 2 )

Lay of the Water - The Southeast Rivers and Streams Outside of the Amazon and Mekong, the Southeast Rivers and Streams of the United States is the most aquatically biodiverse. The highest number of fish, snail, mussel, crayfish, amphibians species in North America.

Lower and Upper Colorado River Basins Columbia River Basin Cahaba Clinch – 126 Conasauga – 76 Paint Rock – 79 Duck – 147 Lay of the Water - Native Fish 33 Native Fish Species 25 Native Fish Species

Lay of the Water - August 2008 (Fishes)

Why Are So Many Species in Decline? HABITAT LOSS sediment nutrient loading contaminants dams mining agriculture/aquaculture forestry/forest products non-point sources point sources invasive/exotic species water withdrawals sprawl (infrastructure)

Dams/Impoundments

Barrier to migration Impacts to Aquatic Species dam!

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam?

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam? Sediments

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam? Sediments Mussel and snail species

 12 species of mussels and 26 species (63%) of freshwater snails were lost when the river was dammed and modified.  Currently,  7 threatened or endangered fish  10 threatened or endangered mussels  3 threatened or endangered snails Pleurobema decisum Gary Peeples, U.S. Fish and Wildlife Service

relationship

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam? Sediments Mussel and snail species? Water Flow

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam? Mussel and snail species? Sediments Water flow Water Temperature

Impacts to Aquatic Species

Barrier to migration Benthic diversity downstream of dam? Mussel and snail species? Sediments Water flow Water Temperature

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam? Mussel and snail species? Sediments Water flow Water Temperature Dissolved Oxygen

Impacts to Aquatic Species Barrier to migration Benthic diversity downstream of dam? Mussel and snail species? Sediments Water flow Water Temperature Dissolved Oxygen Certain recreational fishing

Impacts to Aquatic Species