Sentences with word «quagga»

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.
A young girl sits on a mound of quagga shells at Sleeping Bear Dunes National Lakeshore in Michigan.
Initially, this was a post of mine on Olivia Judson's article about Quaggas and extinction, but I find it appropriate here as well...
It was awarded the Colorado Governor's Award for High Impact Research in 2012 for its work advancing the early detection of invasive quagga and zebra mussels.
The zebra - like quagga was the first extinct species to have its DNA sequenced, back in the genomic Stone Age of 1984, but it's not up to modern standards.
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.
The hope is that over many generations an animal akin in appearance to the extinct quagga might evolve.
1984: Allan Wilson and Russ Higuchi clone gene fragments from 140 - year - old quagga pelt, proving DNA in nonliving tissue can be reproduced.
Quaggas filter nutrients out of the water year - round.
This depth tolerance, coupled with the fact that quaggas don't require a hard surface to attach to, means they can blanket vast swaths of lake bottom inaccessible to zebra mussels.
Lake Michigan's quagga mass in one recent year was estimated to be about seven times greater than the schools of prey fish that sustain the lake's salmon and trout.
«New methods improve quagga and zebra mussel identification.»
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.
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.
The last wild Quagga was shot in the 1870s, with the last one held in captivity dying in August of 1883.
The earliest possible detection of quagga and zebra mussels has long been a goal of biologists seeking to discover their presence in water bodies.
One possibility is that the spread of invasive quagga and zebra mussels in the lake has promoted the dominance of microcystin - producing cyanobacteria and has altered the lake's phosphorus cycle.
The land of the Nuweveld Mountains that dominate the Karoo National Park is the home of the riverine rabbit, the black rhino and the extinct quagga.
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.
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.
At the time, George had begun collaborating with molecular biologist Allan Wilson, a colleague at Berkeley who had just cloned gene fragments from the 140 - year - old pelt of a quagga, an extinct brown - and - white - striped zebra relative.
In 1984, geneticists recovered 229 base pairs of genetic code from a quagga, a subspecies of zebra extinct since the late 1800s.
Meanwhile, quagga mussels have also been detected for the first time in the Rhine at Basel.
Unlike zebra mussels, which typically aren't found at depths beyond 60 feet, quaggas have been plucked from waters as deep as 540 feet.
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.
«Improving the accuracy of testing provides Reclamation and its partners better information about the presence of quagga and zebra mussels in water bodies where our facilities are located,» laboratory manager Denise Hosler said.
The quagga mussel destruction is so profound it is hard to fathom.
The Bureau of Reclamation's Detection Laboratory has released two reports identifying a new sampling method to improve the accuracy of quagga and zebra mussel detection while still at the microscopic larval stage.
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.
Reports identify new sampling and testing methods that improve accuracy in the detection of quagga and zebra mussels and outline procedures used to test for them.
For early detection, Reclamation searches samples from reservoirs, lakes, canals and other water bodies for the microscopic larval form of quagga and zebra mussels.
The results also draw a straight line from the prehistoric extinction of large animals via the historical regional or global extermination due to hunting (American bison, European bison, quagga, Eurasian wild horse or tarpan, and many others) to the current critical situation for a considerable number of large animals as a result of poaching and hunting (e.g. the rhino poaching epidemic).
Quagga and zebra mussels shun toxin - producing Microcystis cyanobacteria and feed instead on other species of phytoplankton at the base of the lake's food chain, including algae.
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.
In a research paper «Complex replacement of invasive congeners may relax impact on native species: interactions among zebra, quagga, and native unionid mussels,» lead author Lyubov E. Burlakova, research scientist with the Great Lakes Center discusses the importance of understanding those interactions.
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.
Quagga and Zebra Mussels are quickly becoming America's most troublesome freshwater invasive species.
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.
«Zebra, quagga mussels trump pollution as change agents in Lake Erie.»
«The zebra and quagga mussels are ecosystem engineers,» said Burlakova.

Phrases with «quagga»

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