BECAS
COSTAS Santiago Martin
artículos
Título:
The relative effect of altitude and aspect on saxicolous lichen communities at mountain summits from central-west of Argentina
Autor/es:
COSTAS, SANTIAGO MARTÍN; CANTON, NORMA; RODRÍGUEZ, JUAN MANUEL
Revista:
RODRIGUESIA
Editorial:
Instituto de Pesquisas Jardim Botanico do Rio de Janeiro
Referencias:
Lugar: Río de Janeiro; Año: 2021 vol. 72
ISSN:
0370-6583
Resumen:
The altitudinal patterns of lichen communities in altitudinal gradients are very variable. The changes that occur along the mountains depend on climatic factors but also on microsite variables such as substrate type and aspect. The effect of altitude and aspect on richness, cover and composition of saxicolous lichens communities along an elevation gradient in extra Andean mountains from the central-west of Argentina was studied. Rock outcrops on the north and south aspect of three mountain summits distributed between 2,500 and 4,500 m.a.s.l. were sampled. Lichen species present in a 20 × 20 cm square were identified and the relative cover was measured using digital photography. Richness, cover and composition were analyzed through linear models and multivariate analysis. Fifty-eight saxicolous lichen species were identified between the three sites. Richness and cover were maximum at middle altitude. Also compositional differences among communities of each mountain summit were found. Finally, the effect of the aspect was significant at lower altitudes for cover and composition.
