Sentences with phrase «quagga mussel»

Recent U.S. Geological Survey studies in western Lake Erie suggest a decrease in zebra mussel numbers but an increase in quagga mussels and total mussel abundance over the last decade.

They found that recent decreases in critical lake nutrients, partly due to increases in invasive species such as quagga mussels, reduce the amount of Chinook salmon that the lake can support.

The study also found that lake trout and steelhead may fare better because these two species can switch from eating alewife, which are in decline, to bottom - dwelling round goby, another newly established invasive prey fish that feeds on quagga mussels.

Both zebra and quagga mussels invaded the Great Lakes at the same time.

The most important finding was that despite the many similarities between Dreissena species, quagga mussels infested unionids less severely than zebra mussels.

Infestation, or the number of dreissenids attached to native unionids, had declined by 2011 - 2012 in lakes dominated by quagga mussels to almost one - tenth of the numbers found in the 1990s.

Therefore ongoing replacement of zebra with quagga mussels in the Great Lakes Region relaxes Dreissena impact on native unionids.

«Zebra, quagga mussels trump pollution as change agents in Lake Erie.»

All boats must have current Lake County Quagga Mussel stickers.

The unwanted quagga mussel also is expected to proliferate in the Pacific Northwest, scientists say.

VICTORIA — B.C. New Democrats introduced legislation to ensure British Columbia is protected from the devastation invasive species such as Zebra and Quagga mussels have brought to communities across North America.

Meanwhile, quagga mussels have also been detected for the first time in the Rhine at Basel.

It was, they would learn two years later, the quagga mussel, named after a subspecies of actual zebras that went extinct in the 1800s.

Water suppliers are particularly concerned about the quagga mussel which, unlike the zebra mussel, can thrive at the depths from which cold water is withdrawn from lakes.

Quagga mussels (purple), which thrive in deeper waters, now cover vast regions of lake bed as well.

The ecological damage wrought by zebra mussels is minor compared with their cousin, the quagga mussel.

The quagga mussel destruction is so profound it is hard to fathom.

This is particularly important in view of the risk of another invasive species spreading across Switzerland: genetic material from the quagga mussel — known to be advancing up the Rhine — has just been detected by Eawag scientists in Basel for the first time.

The quagga mussel is believed to be displacing zebra mussels in parts of the Great Lakes, but this process is only beginning to be studied.

«Zebra mussels and quagga mussels, a related non-native species are found throughout the Great Lakes wherever food is abundant enough to support them — that is, in warmer waters of bays and shoreline areas.

«The zebra and quagga mussels (collectively called dreissenids, because they belong to the genus Dreissena) are here to stay.

The study, which was funded by the U.S. Fish and Wildlife Service via the Great Lakes Fish and Wildlife Restoration Act, focused on the impact of the invasion of Dreissena polymorpha, the zebra mussel, and Dreissena rostriformis bugensis, the quagga mussel, on native mussels.

Infestation was measured by examining unionids to see if either zebra or quagga mussels were attached to them or had been attached previously.

One reason is that the nutrients and plankton in the waters of the Great Lakes are not merely limited, they are crashing, due to a different exotic species, the zebra mussel, and its cousin, the quagga mussel, two invaders that stowed on ships from Europe in the 1980s.

«The zebra and quagga mussels are ecosystem engineers,» said Burlakova.

Although both zebra and quagga mussel populations have most likely peaked — the zebra mussel around 1989 and the quagga mussel between 1998 and 2002 — another invader, the round goby, has been preying on selected benthic groups, continuing to affect the composition of the community.

However, in 1986, Dreissena polymorpha, the zebra mussel, was detected in Lake Erie, followed in 1989 by Dreissena rostriformis, the quagga mussel.

«Other invasive species like zebra and quagga mussels have [already] dramatically shifted the structure and energy flow of many of the Great Lakes ecosystems.»

In California's Sacramento - San Joaquin Delta, higher water temperatures are expected to lead to more delta smelt dying, while invasive species such as the quagga mussel will become more plentiful.

Since then the lakes have been invaded by zebra and quagga mussels, the water levels have been dropping, giant carp are sneaking in from Chicago, and ships keep pumping out contaminated ballast water.

Quagga mussels, which wash up cracked and sharp on the shores of Great Lakes beaches, are one example of invasive species that have been mucking up the U.S. landscape for decades.