The 2005 ESA Annual Meeting and Exhibition
December 15-18, 2005
Ft. Lauderdale, FL

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Saturday, December 17, 2005
D0376

Gryllotalpa major populations at The Nature Conservancy's Tallgrass Prairie Preserve in Oklahoma: Evidence of a fire-dependent species

Dan R. Howard, daniel-howard@utulsa.edu, University of Tulsa, Biological Sciences, 600 South College, Tulsa, OK

The prairie mole cricket (Gryllotalpa major Saussure) is a native of the tallgrass prairie ecosystem of the south central United States. Largest of the North American cricket species, its populations have dwindled with the reduced availability of suitable grassland habitat. Populations are known to occupy relict prairie sites in Oklahoma, Kansas and Missouri. The Nature Conservancy’s Tallgrass Prairie Preserve in north central Oklahoma is the largest continuous tract of tallgrass prairie remaining (~16,100 ha). The long-term management plan for this property includes the utilization of prescribed burns, bison grazing, cattle grazing and limited mowing to restore a functional tallgrass prairie landscape. Prairie mole cricket populations were surveyed at the site from 1993 – 1998, and again beginning in 2005, using the male cricket’s acoustic call as a discrete presence indicator. Records from these surveys were integrated with prescribed burn maps (using ArcGIS 9.0 software) of the same period to identify spatial distribution patterns of the calling aggregations at the preserve. This data was then analyzed to determine the randomness of these distributions in regard to pasture burn frequencies. Analysis revealed a statistically significant non-random distribution of prairie mole cricket calling sites, with calling males preferring sites that had been more recently burned. Additionally, a moderately negative correlation exists between the number of prairie mole crickets found in a pasture and the number of months since the pasture had last been burned.


Species 1: Orthoptera Gryllotalpidae Gryllotalpa major (Prairie Mole Cricket)
Keywords: Tallgrass prairie, Fire ecology