1997 Frog and Toad Survey Isle Royale National Park, Michigan
Beeman JL and Oelfke JG. 1997. 1997 Frog and Toad Survey Isle Royale National Park, Michigan. Resource Management Report 97-1. Isle Royale National Park. Houghton, MI
In recent years, there has been a growing concern for the apparent decline in several species of anurans (frogs and toads). There is not only concern for the individual species but for the role these populations serve as an indicator of environmental quality. Isle Royale National Park, Michigan, established a frog survey program in 1996 to monitor and integrate island population data with the Michigan Department of Natural Resources Frog and Toad Survey program. In 1997 our objectives were to establish a third permanent survey route and to estimate the abundance of calling males by species so that a comparison could be made to the 1996 baseline data. Frog and toad surveys were conducted at Isle Royale NP in early spring, late spring, and summer by using three park trails as transects. A total of 30 points were surveyed in each of the 3 survey periods. The mean indices where species were observed was calculated for each survey period. A call index was used to estimate the numbers of calling males of a particular species. A total of 5 species of anurans were recorded on the 3 transects. Three species were located at all of the transects. Mean indices of calls varied among species. Recommendations are made for 1998.
- Type
- Published Report
- Authors
- Beeman, Jennifer; Oelfke, Jack
- Date of Issue
- 1997-09
- Publisher
- Isle Royale National Park
- Units
- ISRO
- Keywords
- Amphibians, anurans, frogs and toads (Salientia), Indicator Species, Isle Royale National Park, Michigan, Survey