how did zebra mussels get to canada?
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Zebra mussels first arrived in Canada in 1986. They were found in a harbour in Lake Erie, most likely transported from Europe via transatlantic shipping. Within several years, zebra mussels spread throughout the Laurentian Great Lakes. ... They are currently found in more than 750 lakes in North America.
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Zebra mussels are a small, destructive invasive species that can spread across Texas by hitching a ride on boats and trailers. They grow to only about 1 ½ inches and develop a distinctive zebra-striped shell. One zebra mussel can produce up to one million microscopic larvae.
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Lake floor food supplies are enriched by zebra mussels as they filter pollution out of the water. This biomass becomes available to bottom-feeding species and to the fish that feed on them.
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Zebra mussels can be introduced into an isolated lake by attaching themselves to boats or boat trailers and then reproducing in the new, isolated lake. To prevent the spread of zebra mussels, workers should refrain from building connecting waterways.
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Within several years, zebra mussels spread throughout the Laurentian Great Lakes. By 1991, zebra mussels began to spread to smaller inland lakes in Ontario and the eastern United States. They are currently found in more than 750 lakes in North America.
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Zebra mussels first entered North America in about 1986, when foreign ships apparently dumped the larvae with ballast water into Lake St. Clair; Within six years, zebra mussels had spread to all the Great Lakes and had entered eight large river systems.
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Zebra mussels are suspension feeders, eating phytoplankton, small zooplankton, large bacteria, and organic detritus by filtering the water and straining out the edible material. Phytoplankton and zooplankton form the base of the aquatic food web, so many animals depend on them for survival.
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The Invasion Zebra mussels were first discovered in the Hudson at very low densities in 1991. By the end of 1992, they had spread throughout the river, and their biomass was greater than the combined biomass of all other consumers (fish, zooplankton, zoobenthos, bacteria) in the river.
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The mussels increased water clarity, but unleashed ecological havoc. ... As they filter water through their bodies, zebra and quagga mussels consume plankton, tiny organisms that are the foundation of the Great Lakes food chain. That increases water clarity, which allows sunlight to penetrate deeper in the lake.
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Adult zebra mussels feed by filtering large amounts of plankton and detritus from the water. Each mussel can filter one liter of water per day! Zebra mussels thrive in nutrient-rich water which supports healthy populations of plankton.
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– Inland lakes in Michigan that have been invaded by zebra mussels, an exotic species that has plagued bodies of water in several states since the 1980s, have higher levels of algae that produce a toxin that can be harmful to humans and animals, according to a Michigan State University researcher.
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Their sharp shells can cut a swimmer's foot. They can have health impacts on fish, wildlife and humans. Zebra Mussels filter contaminants from the water, and can move them up the food chain as mussels are consumed by fish and wildlife.
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Origin and Spread The species was unintentionally introduced into the United States' Great Lakes through the discharge of contaminated cargo ship ballast water. They were first discovered in the Great Lakes in 1988 and were first confirmed in the Duluth/Superior Harbor in 1989.
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The Zebra Mussel gets its name from the dark, striped pattern on their shells. ... Zebra Mussels are believed to have hitch-hiked from Europe to North America in ballast water from transoceanic ships.
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zebra mussels are a huge problem because they harm Native Species. In order for a zebra mussel to live, it must attach itself to a hard object. ... Zebra mussels contribute to biomagnification—the toxins that they filter out of the water are concentrated in their bodies, and passed on to their predators.
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Originally native to Ontario, the Trumpeter swan's extirpation from eastern Canada over 200 years ago was primarily due to hunting pressure and habitat loss. Biologist Harry Lumsden began a provincial reintroduction program in the early 1980's to re-establish the Trumpeter swan in its former habitat and range.
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The species was unintentionally introduced into the United States' Great Lakes through the discharge of contaminated cargo ship ballast water. They were first discovered in the Great Lakes in 1988 and were first confirmed in the Duluth/Superior Harbor in 1989.