Nuevos Datos de Referencia para la Tasa de Crecimiento de Rhizocarpon Subg. Rhizocarpon en Patagonia

Abstract

This paper presents the results from lichen size survey of genus Rhizocarpon subgenus Rhizocarpon performed on surfaces exposed during last century in arid Patagonian environments (Santa Cruz, Argentina). We surveyed the cemetery of Puerto Deseado City and rock surfaces exposed by the retreat of Túnel Glacier in Los Glaciares National Park, providing eight new reference sites to estimate the growth rate of these lichens. Growth rate estimations for subgenus Rhizocarpon are between 0,125 to 0,061 mm per year. These values agree with previous estimations for other portions of Patagonian steppe and exhibit significant difference with available estimations for wetter regions in the Patagonian Andes.