Marine-occurring yeasts of the Avalon Peninsula, Newfoundland, their identification and vertical and seasonal distribution

Swyers, Barbara Ann (1975) Marine-occurring yeasts of the Avalon Peninsula, Newfoundland, their identification and vertical and seasonal distribution. Masters thesis, Memorial University of Newfoundland.

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Abstract

Yeasts were isolated from plankton samples collected off Small Point, Avalon Peninsula, Newfoundland. Morphological, reproductive, cultural and biochemical characteristics were examined. Identification was carried out by means of a key developed by Barnett and Pankhurst (1974) using biochemical data as diagnostic criteria. Only after all data were examined was identification considered final but the use of the biochemical key avoided the more subjective evaluations necessary when depending upon morphological, cultural and reproductive characteristics. -- The following yeats were identified: Debaryomyces hansenii, Rhodotorula rubra, Candida diddensii, Rhodotorula glutinis var. glutinis, Candida diffluens; Candida tropicalis, Rhodotorula graminis, Cryptococcus albidus var. albidus, Cryptococcus infirmo-minatus; Candida humicola, Candida maritima and Leucosporidium scottii. Several "black yeasts" were also isolated. None of the species identified were unique to Newfoundland or northern marine waters. Unidentified isolates were either keyed out to be organisms differing in most of the other criteria or those which had too many questionable reactions to be definitely assigned to a genus and species. -- Methodology, as well as possible effects of environmental factors on the growth of the isolates were discussed and the marine distribution of the species identified was reviewed.

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