Efeito do micro e macroclima sobre o canto de anúncio de anuros da caatinga

Abstract

The advertisement call of anurans is a highly important attribute for the interaction between males and females during the reproductive period. Studies on the thermal biology of these animals have demonstrated that environmental temperature greatly influences the acoustic parameters of the advertisement call. Thus, the analysis of body temperatures, microhabitat temperatures, as well as macro-temperatures, can help researchers understand how the thermal environment affects the reproduction and climatic suitability areas of these animals, particularly in the context of climate change. This study aimed to analyze the relationship between micro and macro-climate on the advertisement call and reproductive behavior of 11 anuran species from the Caatinga Biome. Data collection occurred during the rainy season in 12 locations in the states of Bahia and Paraíba . A total of 666 calls belonging to 11 species were analyzed. Stepwise regression indicated that substrate temperature is the thermal variable that best predicts the body temperature of the analyzed species, followed by humidity. Canonical Correspondence Analysis revealed that air temperature had the greatest effect on the acoustic parameters of the species, particularly on pulse duration. The other analyzed acoustic parameters did not undergo significant changes. The analysis integrating the body temperatures of singing males and distribution models revealed differences in the distribution patterns of the species. Five out of the thirteen analyzed species showed an retraction of their geographical occupancy area under future climate scenarios.