Moon phases influence encounters of anurans in the Brazilian semi-arid region of Piauí

The lunar cycle is associated with the behaviour of amphibians, influencing vocalization, reproductive behaviours, and environmental choices. In the present work, we aimed to answer some questions regarding the influence of lunar phases and their interference with the behaviours of semiarid anuran species in Piauí, Brazil. The work was carried out in the municipality of Floriano (S 6°30’; W 43°42’), and an active search was carried out for the inventory, with weekly campaigns from June 2018 to June 2019. The days were transformed into Julian days, and the sampling corresponding to 365.25 Julian days were transformed into degrees (Julian Day*360/365). The absolute occurrence by species was classified as constant, accessory, and accidental. In the circular statistics the Rayleigh test (Z) was applied to verify that there is no randomness, with the sample being considered unidirectional if the calculated interval corresponds to z≥z (α) and P=0.01. Sample sufficiency was estimated using the RAO’S (U) spacing test, with the value considered random when U