disrupting the food web, the filtering action of zebra and quagga mussels greatly improves water clarity in a water body. As a result, valued sportfish are impacted. Where are they now? Zebra mussels were first discovered in the U.S. in the late 1980s. This change can cause shifts in local food webs, both by robbing food from native species that feed on plankton and also by increasing water clarity and thus making it easier for visual predators to hunt. In the St. Lawrence ETZ, where zebra mussel veligers are now the dominant zooplankton in summer, d13C ranged from 231.2% -Zebra Mussel's have the ability to filter feed large amounts of water, and by doing this, they not only clear up polluted water but they remove large percentages of primary productivity which may reduce the energy available to pelagic food webs. This also causes clearer water, allowing sunlight to penetrate deeper, increasing growth of aquatic vegetation. Any contaminant in the water is multiplied up to 10 times the water concentration in the zebra mussels. These organisms play a critical part in each lake’s ecological food web. When animals such as birds eat these contaminated mussels, they can die. The removal of significant amounts of phytoplankton from the water can cause a shift in native species and a disruption of the ecological balance of a lake. The filtering action of zebra and quagga mussels may also lead to the accumulation of toxins (e.g., metals, PCBs, pesticides) in the fatty tissue and feces of the mussels. The zebra in a food web is 3rd in a food web because, first example there is the sun,then the grass, then the herbavores [vegatarians].Other examples along with the zebra are horses,cows,ZEBRAS, and lots more. This case study allows students to understand community level … Effects of Zebra Mussel on Phytoplankton in Lake Erie. Zebra Mussels are found throughout all the Great Lakes, Lake St. Clair and the Mississippi river watershed. These surveys began prior to the zebra mussel introduction, allowing for pre and post invasion assessment. Using video, data, and hands-on investigations, students will explore how food webs and the abiotic resources and conditions of the ecosystem have changed in response to the zebra mussel invasion. Zebra mussels consume considerable amounts of these beneficial microscopic organisms and this creates less food … The dual reliance of zebra mussels on terrestrial detritus and phytoplankton production, combined with their high biomass, along with the significant terrestrial support of several other consumers, indicates that terrestrial detritus supports a significant portion of the Hudson River food web. The Zebra Mussels have a positive impact into fresh water areas such as its native land in the black and Caspian sea's. Yet another ecological impact that the zebra mussels impose on our native fauna is the fact that they are bioaccumulators. It is up to a point. Tropic transfer in Lake Erie with Zebra Mussel present. Published on the web 12 April 2011. The impacts of zebra mussels have been well documented in … I know what you are thinking – this is a good thing right? When zebra mussels enter into these fragile systems, their voracious filter feeding depletes the availability of microscopic organisms that play a critical part in each lake's ecological food web. Where it has been found. Since their initial discovery in 1989, zebra and quagga mussels have had dramatic impacts on the Great Lakes ecosystem and economy, including changes to the food web, degrading fish habitat, interfering with drinking water systems and damaging tourism and recreation economies. (Photo: Greg Armstrong) 6. The American Great lakes lake Ontario food web of ecosystem with the Zebra Mussel absent. We evaluated by stable isotope analysis the trophic structure of an estuarine transition zone (ETZ) food web and the role of an invasive species, the veliger stage of the zebra mussel Dreissena polymorpha. ... zebra mussels alter the entire food web. Ecological and economic impacts. Zebra mussels consume considerable amounts of these beneficial microscopic organisms. Indirect effects of zebra mussels (Dreissenapolymorpha) on the planktonic food web Erik G. Noonburg, Brian J. Shuter, and Peter A. Abrams Abstract: The exotic zebra mussel (Dreissena polymorpha) has caused dramatic reductions in phytoplankton density in Food Web With Zebra Mussels Human Smelt Birds Bass Trout/ Salmon Zebra Mussels *primary consumer Plankton Perch *primary consumer Mussels Frog Insects *primary consumer Algae *producer Bacteria *producer *unless stated otherwise all organisms are secondary consumers Food Chain With Zebra Mussels Plankton Algae Zebra Mussels *primary consumer *producer The Sun *secondary consumer Indirect effects of zebra mussels (Dreissena polymorpha) on the planktonic food web. The Quagga Mussel has a convex ventral surface. Zebra Mussel filters water to the point where food sources such as plankton are removed, altering food webs. Why are they a concern for Lake Winnipeg’s ecosystem? Zebra Mussel filters water to the point where food sources such as plankton are removed, altering food webs. As a result, valued sportfish are impacted.

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