SciELO - Scientific Electronic Library Online

vol.33 issue1Reestablishment, new records, and a key for the species of Aspidosperma (Apocynaceae) from the Brazilian AmazonPalynological evidence of vegetation change during the last 10,000 years in the mid-valley of the Rio Doce, Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Acta Botanica Brasilica

Print version ISSN 0102-3306On-line version ISSN 1677-941X


NUNES, Lucas; BURLE, Giulia; GUMBOSKI, Emerson Luiz  and  DECHOUM, Michele. Abiotic effects on the cover and richness of corticolous lichens on Araucaria angustifolia trunks. Acta Bot. Bras. [online]. 2019, vol.33, n.1, pp.21-28.  Epub Sep 21, 2018. ISSN 0102-3306.

Lichens play a key role in natural ecosystems, as they can function as primary producers, recycle minerals and fix nitrogen. Despite their environmental importance, little is known about lichen ecology in Brazil, and especially about how abiotic factors may influence their spatial distribution. In this study, we aimed to verify how the cover and richness of corticolous lichens on Araucaria angustifolia trunks vary between two different habitats (Forest and Grassland). The photoquadrat sampling method was applied to A. angustifolia trunks. The Coral Point Count software with Excel extensions (CPCe) was used to analyze photographs for lichen cover and richness. Additionally, a redundancy analysis was conducted to estimate how five abiotic and two biotic variables affected the spatial distribution of lichens. Twenty-five morphospecies were identified, none of them occurring exclusively in the Grassland habitat. Canopy openness, air humidity and tree trunk rugosity were important parameters influencing lichen distribution; therefore, spatial segregation of growth forms can be explained by environmental selectivity. Foliose lichens require more air humidity, which explains their predominance in the Forest habitat. Canopy openness in Grassland habitat favors fruticose lichens, which depend on factors such as wind for reproduction.

Keywords : Ascomycota; corticolous lichens; environmental selectivity; fungi; lichen ecology; niche overlap.

        · text in English     · English ( pdf )