An 1800-year record of Austrocedrus chilensis growth reveals an unprecedented recent decline in the Patagonian forest–steppe ecotone. - Wouters, Daiana; Christie, Duncan A.; LeQuesne, Carlos; Marcotti, Eugenia; Vega, Leticia María; Mundo, Ignacio; Gipoulou-Zúñiga, Tania; Rojas-Badilla, Moisés; Srur, Ana; Masiokas, Mariano; Villalba, Ricardo (Ecological Processes, 2026)