Distribution of halotolerant and/or fermentative yeasts in aquatic environments
2001
Urano, N. (Tokyo Univ. of Fisheries (Japan)) | Yamazaki, M. | Ueno, R.
This study deals with halotolerant and/or fermentative yeasts living in various aquatic environments: upper stream of Arakawa river, middle and lower streams of Tamagawa rivers and sea coasts of Kemigawa in Chiba prefecture and of Chemigahama in Choshi city. Colony forming units of the yeasts decreased with the increase of osmotic pressure or salt concentration and increased with the increase of total organic carbon in aquatic areas. The average limit concentration of NaCl for yeast growth and fermentation in the sea coasts were 2.3 - 2.5M and those in the rivers were 1.2 - 1.9M. The existence ratio in number of fermentative yeasts to total yeasts under 2.5M NaCl was 17 - 31% in the sea coasts and 0 - 4% in the rivers, respectively. Therefore, high salt tolerant and fermentative yeasts were found to inhabit largely the sea coasts.
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