Using historical data to assess changes in Wyoming's fish fauna

Article Abstract:

Fish survey data from 10 drainages of Wyoming from the 1960s and the 1990s have been compared to find species which are declining in numbers. The comparisons were not as good as they might have been because sampling designs and methods differed, as did efficiencies. Locations found in both surveys were used and data adjusted for differences in methods. Of 31 native species, 12 were found in fewer locations in the 1990s survey, although sampling gear was better. After adjusting for gear bias, another 12 native species showed declines. Some minimum estimates of species declines could be made, although there were problems in comparing data. On the larger scale of the drainage, fewer species seem to be changing distributions. Extirpations at the drainage scale were the most serious declines seen. If conservation efforts are to be put into effect before a species is shown to be in danger of extinction, population drops must be found before a species is very rare. Historic survey data are more useful than new data alone for showing declines in population.

Fishes, Animal populations, Wyoming, Biometric research

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Strategies for the conservation of Asteraceae in Mexico

Article Abstract:

Conservation of genera of Asteraceae in Mexico has been undertaken through use of various strategies. In an effort to determine the minimum number of sites required to protect 371 genera native to Mexico, of which 18.1% are endemic to it, distribution of the genera was analyzed, by state. Results allowed definition of patterns of geographical distribution for Asteraceae genera in Mexico and made it possible to identify the states that should have high priority in conservation efforts. If conservation strategies for the generic flora are promptly put into effect, future strategies for conservation of representative areas of the Mexican flora will be better organized and more efficient.

Statistics, Mexico, Plant conservation, Rare plants, Asters

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Conservation of Pacific salmon: response to Wainwright and Waples

Article Abstract:

Estimating risk is one small factor in recovery planning for a species. Priorities for stock-specific recovery activity are also important. Evolutionarily significant units (ESUs) are important factors and they relate to the U.S. Endangered Species Act. Failure of managers and institutions to respond when a stock is endangered is actually a major risk, however, and salmon are now becoming extinct. Prioritizing recovery efforts in such a way that waiting for perfect data or full evaluation does not interfere with efforts to save fish is important.

United States, Environmental policy, Fish populations, Salmon, Restoration ecology, North Pacific Ocean

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