Ecology of cultivable yeasts in pristine forests in northern Patagonia (Argentina) influenced by different environmental factors.
Environmental factors influencing the occurrence and community structure of soil yeasts in forests are not well studied. There are few studies dedicated to Southern Hemisphere soil yeasts populations and even fewer focused on temperate forests influenced by volcanic activity. The present work aimed to study the ecology of soil yeast communities from pristine forests influenced by different environmental factors (precipitation, physicochemical properties of soil, tree species, soil region, and season). The survey was performed in 4 northern Patagonian forests: 2 dominated by Nothofagus pumilio and 2 by Nothofagus antarctica. Yeast communities were described with ecological indices and species accumulation curves, and their association with environmental characteristics was assessed using multivariate analysis. Each forest site showed a particular arrangement of species as a result of environmental characteristics, such as dominant plant species, nutrient availability, and climatic characteristics. Cryptococcus podzolicus was most frequently isolated in nutrient-rich soils, Trichosporon porosum dominated cold mountain forests with low nutrient and water availability in soil, and capsulated yeasts such as Cryptococcus phenolicus dominated forest sites with low precipitation. The present work suggests that environmental factors affecting yeast communities may not be the current soil characteristics but the result of complex interactions of factors including natural disturbances like volcanic activity.
a Laboratorio de Microbiología Aplicada y Biotecnología, Centro Regional Universitario Bariloche (CRUB), UNCO-INIBIOMA (Universidad Nacional del Comahue-CONICET), Quintral 1250, Bariloche (8400), Río Negro, Argentina.
María Cecilia
MC
Mestre
Sonia
S
Fontenla
Carlos A
CA
Rosa
D001118:Argentina; D001487:Basidiomycota; D044822:Biodiversity; D004271:DNA, Fungal / Q000737:chemistry / Q000302:isolation & purification; D004777:Environment; D015999:Multivariate Analysis; D010802:Phylogeny; D025341:Principal Component Analysis; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D014197:Trees; D015003:Yeasts / Q000145:classification / Q000235:genetics / Q000254:growth & development / Q000502:physiology*
D004271:DNA, Fungal; D012987:Soil
Patagonian forests soil; community yeast structure; diversité des levures; soil ecology; sol des forêts patagoniennes; structure communautaire des levures; yeast diversity; écologie des sols