IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Southern Gondwanan fungi associated with Nothofagaceae in Patagonia
Autor/es:
HEALY, ROSANNE; TRUONG, CAMILLE; MUJIC, ALIJA; NOUHRA E
Reunión:
Congreso; International mycological congress; 2018
Resumen:
Current understanding of fungal biodiversity is particularly limited in South America, yetglobal studies have identified many unique fungal lineages that are present in the Southern Hemispherebut absent from other regions. The ectomycorrhizal tree family Nothofagaceae is one striking exampleof vicariance associated with the final breakup of Southern Gondwana (part of the supercontinent thatincluded South America, Antarctica and Australia) and the onset of Antarctic glaciation at theEocene/Oligocene boundary (ca. 32 mya). However, conflicting evidence suggests that long-distancedispersal or migration has continued long after the fragmentation of Southern Gondwana. As expectedfrom previous studies, we detected strong biogeographic connections between South America andAustralasia within many ectomycorrhizal fungal lineages collected in our biodiversity assessment of thePatagonian region (Chile and Argentina). We traced the most recent common ancestors of severalsouthern temperate lineages of Basidiomycota and Ascomycota using dated phylogenies built fromnuclear ribosomal loci ITS and LSU as well as RPB2 and EF1-alpha markers. We tested alternativehypotheses of vicariance or long distance-dispersal while taking into account the spore dispersalabilities, responses to disturbance, and whether taxa are early or late successional in Nothofagaceaeforests. We also tested whether taxa with sequestrate fruiting bodies are more likely to have a restricteddistribution and show evidence of a Southern Gondwanan origin. Our global approach usingbasidiomycete and ascomycete fungi with various life-history strategies will highlight common patternsfor ectomycorrhizal fungi in the Patagonian region.