Fig. 2
Temporal fluctuation of the measured environmental variables: sound pressure amplitude (root mean square of the signal amplitude envelope), rainfall (mm), temperature (°C), solar radiation (w/m2), atmospheric pressure (Pa) and relative humidity (%). The acoustic amplitude plot shows two clear peaks that are related to explosive breeding events. For illustration purposes, only the variables measured at a single pond (Blanc) are highlighted in dark colours, the data collected at the other four ponds are plotted as light grey lines in the background. Dates are given as year/month/day