Seasonal occurrence of yeasts and other fungi in a freshwater lake

Yeast diversity in a mesotrophic lake on the karstic plateau of Lagoa Santa, MG-Brazil

“…The functioning of tropical lakes is known to be influenced by differences between dry and rainy seasons, in contrast to temperate lakes, which usually show a well-marked seasonal predictability. The ecological significance of yeasts in aquatic environments is still unclear but an increase of yeasts with input of allocthonous organic material and diatom blooms was observed (Quinn, 1984). Probably, yeasts are metabolically active in aquatic ecosystems and contribute to the carbon cycling in these environments, as part of the microbial loop.…”

Terrigenous micromycetes in freshwater ecosystems (review)

“…Arnaud are considered temporary or even perma nently active in the aquatic environment. The propagules of dozens of terrestrial fungi species were registered in the mycobiota of the bottom sediments of the lakes and other standing; these fungi species are common for the terrestrial environment of different climatic zones, where mitosporic hyphomycetes dom inate [18,22,23,38,39,42].…”

“…Two seasonal peaks of mitosporic micromycetes, spring and autumn, are observed in the lakes [18,34,35,42,47]. In Pleshcheevo Lake, the first peak occurs in March-May and the second occurs in SeptemberNovember.…”

“…If the trophic status of the lake is high, the sea sonal dynamics are less pronounced, as is observed during the comparison of the mycoplankton of mesotrophic Pyashechno Lake and eutrophic Gle bokoe Lake in Poland [35]. The autumn peak of the abundance of the fungi propagules is preconditioned by their transport with the detritus and soil particles coming from the watershed areas, especially after rain, as well as with the transport by the leaf fall and autoch thonous organic matter [42], supported by the maxi mal abundance of micromycete propagules in the sur face water layer [18]. The spring peak of the fungi abundance links to an increase in the autochthonous food sources for the fungi, i.e., with the death of dia toms after the spring bloom [42].…”

“…The autumn peak of the abundance of the fungi propagules is preconditioned by their transport with the detritus and soil particles coming from the watershed areas, especially after rain, as well as with the transport by the leaf fall and autoch thonous organic matter [42], supported by the maxi mal abundance of micromycete propagules in the sur face water layer [18]. The spring peak of the fungi abundance links to an increase in the autochthonous food sources for the fungi, i.e., with the death of dia toms after the spring bloom [42]. In Loch Ness they are considered an endogenous active population of the yeast belonging to the terrestrial fungi [42].…”