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Monday, January 25 • 11:20am - 11:40am
20 Years of The Michigan Frog & Toad Survey

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AUTHORS: Lori Sargent*, Michigan Department of Natural Resources

ABSTRACT: The Michigan Frog and Toad Survey has successfully completed 20 years of data collection. Three species, Fowler’s toad, Blanchard’s cricket frog, and mink frog, have ranges that include only a portion of the state. A calling index of abundance of 0, 1, 2, or 3 (less abundant to more abundant) is assigned for each species at each site. Results from the evaluation of methods and data quality showed that volunteers were very reliable in their abilities to identify species by their calls, but there was variability in abundance estimation. The number of sites per route at which species were heard is used for trend analysis. A statewide, 20-year analysis was done, along with a 10-year analysis and a one-year analysis. Percent change was calculated for each species using the number of sites per route. For most species the trends are similar between zones. Most species’ trends appear to be stable or increasing. The 10-year analysis shows only two species declining. The 20-year analysis shows declines in eight species, which is up from six as calculated in 2014.

Monday January 25, 2016 11:20am - 11:40am EST
Vandenberg A