Discovery and characterization of a large population of Parodia linkii (Lehm.) R. Kiesling (Cactaceae) in Southern Brazil: Challenges and conservation implications

Parodia comprises 62 cactus species inhabiting the Pampas plains and Andes slopes. Notably, Parodia linkii is vulnerable to extinction in Brazil but classified as Least Concern by the IUCN. This study describes an area in Rio Grande do Sul, Brazil, where P. linkii occurs. Research was conducted in a transitional zone between the Pampa and Atlantic Forest biomes in Santiago municipality. Data collection involved 23 linear transects, each 25m long and spaced 1m apart, covering about 600 m². Individuals and sprouts from different colonies were quantified. For analysis, 14 quadrants (1 x 1 m) were established along the population, spaced 5m apart, including sloped and flat rocky areas with mixed vegetation. Diameter measurements and floral sprout recordings were taken. A total of 1,205 P. linkii individuals were recorded, thriving in basalt rock crevices, averaging 2.08 individuals per square meter, with approximately 50 (±2.39) individuals along each transect. The study highlights the importance of habitat cataloging for preserving P. linkii, especially in its transitional habitat. This research enhances understanding of P. linkii’s ecological needs and supports conservation efforts for diverse landscapes that sustain various biological communities, ensuring the species’ long-term survival.