Impacts of Invasive Asian Carps on Freshwater Ecosystems
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1 Impacts of Invasive Asian Carps on Freshwater Ecosystems Cindy Kolar Invasive Species Program Duane Chapman Columbia Environmental Research Center ACES Conference December 7, 2010 U.S. Department of the Interior U.S. Geological Survey
2 What are Asian carps? Bighead and silver carps Large-bodied planktivores Introduced in the 1970s Escaped into waterways Bighead carp Silver carp
3 Global History of Introduction Species Countries introduced Countries with self-sustaining populations Bighead carp Silver carp Number of Countries Bighead Silver Year of Introduction
4 Reasons for Introduction Around World Bighead Carp Silver Carp Aquaculture Capture fisheries Plankton control Research Sport/angling SAV control Accidental Unknown
5 Extent of Distribution Reproducing in about 20 states Nonindigenous Species Database ( Silver carp Bighead carp
6 Quickly Became Abundant Exponential population growth Most abundant fish in some areas
7 Entry into the Great Lakes? Proximity to Lake Michigan Chicago Area Waterways Electrical barriers to deter movement
8
9 Suitable Temperature? Bighead Silver Mandrak and Cudmore 2004 Pictures based only on air temperature Lots of things besides air temperature control where fish live
10 Spawning? Only free-flowing length considered
11 Food Resources? Cooke et al. (2010) Asian carps need ~10 ug/l chlorophyll (without swimming or breeding) Should do well in parts of Lake Erie But not in open water of larger Great Lakes BUT Flexible diets BUT DO live on less, in some places like Lake Balaton, Hungary
12 Freshwater Ecosystem Service Impacts Provisioning Services Regulatory Services Cultural Services Supporting Services
13 Provisioning Services Quantity and quality of water for consumptive use Drinking, domestic, industrial, agricultural Water for non-consumptive use Power, transportation, navigation Aquatic organisms for food and medicine
14 Provisioning - Effects on Water Quality
15 Provisioning Transportation, Navigation, Water Quantity
16 Provisioning Aquatic Organisms Asia Region Location Native Species Citation China, Changshouhu Reservoir, Yangtze River Sharpbelly Li (2001) China, Plateau lakes Barbless carp Xie & Chen (2001) China, Yunnan Province Racoma taliensis, Cyprinus meglophthalmus, Anabarilius grahami, A. albrunops, A. polylepis Yang (1996) Thailand Native clupeids De Iongh & Van Zon (1993) Indian subcontinent India, Gobin Sagar Reservoir India, Kulgarhi Reservoir Catla, rohu, golden mahseen Shetty et al. (1989) Catla, rohu Dey et al. (1979) Middle East Aral basin Aral barbel Pavlovskaya (1995) Israel Tilapias Spataru and Gophen (1985) Europe Poland Roach, rudd Wilkonska (1988) Germany Sunbleak, bleak, zander Costa-Pierce (1992)
17 Provisioning Aquatic Organisms Competition between paddlefish and bighead carp demonstrated in mesocosms (Schrank et al. 2003) Diet overlap between gizzard shad, bigmouth buffalo, and Asian carps (Schuyler et al. 2004) Reason to believe that planktivorous fishes will be affected declines in zooplankton Declines in commercial harvest of native species
18 Provisioning Aquatic Organisms
19 Regulatory Services Maintenance of water quality Natural filtration, water treatment Buffering of flood flows Erosion control through land/water interactions, flood control infrastructure
20 Cultural Services Recreation River rafting, canoeing, kayaking, sport fishing, jet skiing, water skiing, boating, swimming Tourism Existence values Personal satisfaction
21 Supporting Services Role in nutrient cycling and primary production Predator/prey relationships and ecosystem resilience Habitat for native species
22 Conclusions Have been and will be additional effects to freshwater ecosystem services Not a focus of study to date Not quantified Interaction of Asian carps with management goals will affect delivery of ecosystem services
23
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