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—Advertisement call variation and male mating success was investigated in a population of the Arizona tree frog, Hyla wrightorum, from central Arizona. Dominant frequency of advertisement calls was significantly correlated (negatively) with male snout-vent length. Males found mating were not significantly larger than nonmating males, nor was there a significant correlation between sizes of males and females found in ample.xus. These results are discussed in relation to Renaud's (1977) work with H. tiri^,htorum and in light of recent work with anurans in general. The Arizona tree frog {Hyla wrightonwi) is primarily restricted to the Petran Montane Conifer Forest Biome (Brown and Lowe 1980) along the Mogollon Rim in central Arizona and extreme west central New Mexico, and in the Hnachuca Mountains of southern Arizona (Stebbins 1966, Renaud 1977). Other than discussions of taxonomy, to date little has been published concerning this anuran. In his description Taylor (1938) placed H. wrightorum in the H. eximia species group; subsequently a number of authors have considered H. wrightorum as a subspecies of H. regilla (Jameson et al. 1966, Jameson and Richmond 1971) or as conspecific with H. eximia (Duellman 1970). However, Renaud (1977) documented that H. eximia, H. regilla, and H. wrightorum are distinct in their mori3hology (primarily size) and advertisement calls, and in light of their allopatric distributions warrant recognition as full species. Unfortunately Renaud's work remains unpublished and, hence, largely overlooked. Here I present an analysis of advertisement call variation in a population of//, wrightorum from central Arizona. I compare my results with those of Renaud (1977) and hope to draw attention to his valuable work. I also examine the relationship between male size and mating success and test the hypothesis that advertisement call parameters (frequency, pulse rate, and duration) are predictably related to male snout-vent

Advertisement call variation in the Arizona Tree Frog, Hyla wrightorum Taylor, 1938