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Dynamics of yeast populations recovered from decaying leaves in a nonpolluted stream: a 2-year study on the effects of leaf litter type and decomposition time.
- Source :
-
FEMS Yeast Research . Jun2007, Vol. 7 Issue 4, p595-603. 9p. 1 Chart, 3 Graphs. - Publication Year :
- 2007
-
Abstract
- Here we report on the results of a survey of the yeast populations occurring on submerged leaves (alder, eucalyptus and oak) in a natural mountain stream, during different phases of their decomposition and through two consecutive years. Leaf litter mass loss, total yeast counts, Shannon–Weiner index ( H′), yeast community structure and physiologic abilities were analyzed to evaluate the dynamics of yeast communities during decay. Seventy-two yeast taxa were recorded, and in all litter types, species of basidiomycetous affinity predominated over ascomycetous ones. Discriminant analysis of presence/absence data (yeast species) showed significant differences both among substrate types ( P<0.0026) and with decomposition time ( P<0.0001). Carbon and nitrogen source utilization by yeast strains also varied with the substrate ( P<0.0001) and decomposition time ( P<0.0001). Further conclusions were that: (1) all litter types have in common ubiquitous yeast species, such as Cryptococcus albidus, Debaryomyces hansenii and Rhodotorula glutinis, among the common 20 yeast species; (2) only a few species were dominant, and most species were rare, being recorded once or twice throughout decomposition; and (3) the order of yeast appearance, and their substrate assimilation patterns, strongly suggest a succession phenomenon. Finally, explanations for the distribution patterns and variations in yeast communities are discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *YEAST
*CHEMICAL decomposition
*LEAVES
*BIODEGRADATION
*PLANT growing media
Subjects
Details
- Language :
- English
- ISSN :
- 15671356
- Volume :
- 7
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- FEMS Yeast Research
- Publication Type :
- Academic Journal
- Accession number :
- 25065431
- Full Text :
- https://doi.org/10.1111/j.1567-1364.2007.00218.x