MSA - Ecology/Pathology
Marano, Agostina V , Gleason, Frank H .
Patterns of frequency, abundance and density of Rhizophlyctis rosea populations from cropping soils in Australia.
The distribution of Rhizophlyctis rosea populations was examined in soils from 21 locations including disturbed and undisturbed habitats in Australia. Within the disturbed habitats, samples from four sites which experience different temperatures ranges at New South Wales (Narrabri, Robertson and Pitt Town Bottoms) and Queensland (Biloela) were assessed for frequency, abundance, density and number of thalli recovered (TRG). Lens paper baits were placed into Petri dishes with water and air dried soil. The cultures were then incubated for up to four days at 20, 35 and 40 C, or at 20 C after freezing (-15 C) and heating (80 C) the soil. Thalli of R. rosea were observed on baits from 59 % of the sites and more frequently in cropping (71 %) than in natural soils (39 %). The abundance, frequency, density and TRG of its populations varied among the samples analyzed, with the greatest abundance, number of thalli, density and TRG for Pitt Town Bottoms and the highest frequency for Pitt Town Bottoms and Narrabri soils. Stressful temperature conditions (freezing and heating) increased the number of thalli observed on the baits. The present study showed preliminary evidence of a different distribution pattern of its populations related to soil temperature stress.
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1 - Universidad Nacional de La Plata, Instituto de Botánica Spegazzini, 53 N° 477, La Plata, Buenos Aires, 1900, Argentina
2 - University of Sydney , School of Biological Sciences A12, Sydney, New South Wales, 2006, Australia
Presentation Type: Poster:Posters for Topics
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM