Abstract
ed male signals, which can subsequently be artificially modified until they fall outside female recognition levels. In this study, the drumming of Alaska and Colorado populations of Pteronarcella badia appeared to represent dialects. Seventy-six signals from four Alaska pairs differed from 104 signals of three Colorado pairs in having: fewer numbers of mode and x beats in males and females, shorter male-female beat intervals despite recording of 3?C cooler temperature, and female answers to male responses (four-way) in 2.6% of signal sequences, compared to none in Colorado pairs (Table 1). These differences suggest a behavioral variation that could represent an early indication of speciation. We will reciprocally test males and females of these populations to determine how exclusive these dialects have become.
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