From the intestinal tracts of 37 out of 69 birds belonging to four species of gulls (Larus fuscus, L. genei, L. argentatus, L. ridibundus) and three species of terns (Sterna sandvicensis, S. hirundo, S. minuta) 62 yeast isolates belonging to 16 species were obtained. The occurrences of individual yeast species were (% of positive birds in brackets): Saccharomyces cereυisiae (20%), Torulopsis glabrata (12%), S. oleaginosus (10%), Candida tropicalis (9%), C. albicans (9%) and T. pintolopesii (7%), other yeast species (1–4%). Average numbers of colony-forming units/g. wet intestinal contents in the seven host species were: Larus fuscus 5210; Larus genei 22,200; L. argentatus 5620; L. ridibundus 3180; Sterna sandυicensis 50; S. hirunda 211,000; S. minuta 9200.
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