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In the U.S. National Biological Service's gap analysis, potential distributions of terrestrial vertebrate species are based on the synthesis of wildlife habitat relation data and then modeled using a vegetation cover map derived from Landsat Thematic Mapper imagery. Using long-term species lists from eight National Parks in Utah, we evaluated the adequacy of the wildlife habitat relations data generated by gap analysis in predicting species distributions at landscape scales. Omission and commission error rates were estimated for major taxonomic groups and for each national park. Depending on the taxonomic group, omission error ranged from 0 to 25%, whereas commission error ranged from 4 to 33%. Error rates were...
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Staff at Bryce Canyon National Park conducted noise monitoring surveys from 30 May to 31 August 1995 at five sites using the 15-second Leq method. Noise levels from helicopters, planes, jets, and other mechanical means, as well as natural or background noise were monitored. Aircraft were heard park-wide an average 18.8% of the time with an average of 36.4 decibels. Site-specific information is presented on peak decibel levels, average noise levels, and number of aircraft overflights. Published in Proceedings of the Third Biennial Conference of Research on the Colorado Plateau, in 1996.
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