More than 3,800 species of plants and animals live in Nevada and 173 of these are not found anywhere else in the world. Their well-being was examined in a three-year study of Nevada's streams.
The survey said that less than half of the state's 283 streams surveyed are in good to very good condition.
The study said 13 percent of the streams are in poor condition. Some of the problems included excessive ground water withdrawal, incompatible livestock grazing and grazing by wild horses and burros.
The Nevada Stream Conservation Plan, released Monday was compiled by the Nevada Natural Heritage Program, the Desert Research Institute at the Nevada System of Higher Education and the Nature Conservancy.
The goal of the group is to have half of the state's streams in good to very good condition by 2025.
The report says about 90 miles northwest of Las Vegas in the Amargosa and Oasis valleys of Southern Nye County "is a desert oasis harboring at least 20 plants and animals found nowhere else in the world, plus a number of other species of concern dependent upon spring ecosystems."
And restoration is planned in this area to restore the critically needed aquatic habitat for the native species within the Fairbanks and Soda Springs spring brook overflow systems.
The report said the restoration is important to protect the Ash Meadows pupfish, speckled dace, endemic aquatic invertebrates and springnails.
Statewide, two of the threats to the rare plants and animal life are the bullfrog and the convict circhlids. "The bullfrogs feed on anything that gets into their mouth directly contributing to the decline of native species," the study said.
The convict circhlids is released into fresh water and "preys on native aquatic species," the study said. The goal is to reduce, control and eradicate these "highly invasive non-native aquatic species."
Jennifer Newmark, administrator of the Nevada Natural Heritage Program, said the study found of the 69 highest priority conservation sites 53 are springs with rare plant and animal life.
The Nature Conservancy is a leading conservation organization working around the world to protect ecologically important lands and waters for nature and people. The Conservancy and its more than 1 million members have protected nearly 120 million acres worldwide. Visit The Nature Conservancy on the Web at www.nature.org.