The Acoustic Index User's Guide: A practical manual for defining, generating and understanding current and future acoustic indices. - Bradfer‐Lawrence, Tom; Duthie, Brad; Abrahams, Carlos; Adam, Matyáš; Barnett, Ross J.; Beeston, Amy; Darby, Jennifer; Dell, Benedict; Gardner, Nick; Gasc, Amandine; Heath, Becky; Howells, Nia; et al. (Methods in Ecology & Evolution, 2025)