Decline in biological soil crust N-fixing lichens linked to increasing summertime temperatures - Finger-Higgens, Rebecca; Duniway, Michael; Fick, Stephen; Geiger, Erika; Hoover, David; Pfennigwerth, Alix A.; Van Scoyoc, Matthew; Belnap, Jayne (Proceedings of the National Academies of Science (PNAS), 2022)