Whitford, P.C. 1991. Blanchard's cricket frog survey of southeast Minnesota 1990/1991. Report submitted to the Nongame Wildlife Program, Minnesota Department of Natural Resources. Unpaged.
Auditory surveys for calling male Blanchard's Cricket Frogs, whose voice differs recognizably from other frog species were conducted between 8:00 p.m. and 2:00 a.m. along selected routes in Houston and Fillmore counties from 20 March to 31 July 1990 and 1991. Observers were upper level Biology Majors from WSU who were trained with tapes of frog and toad calls provided by the Wisconsin Department of Natural Resources - Nongame Division. They followed the protocol of that department's volunteer anuran survey program in data collection. A total of 3236 miles were driven and 148 student hours were spent on the surveys during the two years of data collection. Data from all locations includes all species of frog heard at each site in the surveys and their relative abundance, judged by number calling at each site. These data were recorded, compiled, mapped and provided to the Minnesota Department of Natural Resources - Nongame Office. Specific data on Blanchard's Cricket Frog breeding site selection was not able to be obtained as originally planned for lack of adequate numbers of this species found. Only three very probably sites were found where this species was thought to be present, and one possible site was recorded. None of the sites had populations large enough or loud enough to permit recording of calls above the clammer of other larger, more abundant frog species, to document presence of Blanchard's Cricket Frog in the manner required by the Minnesota Department of Natural Resources.