Geology topics

H.F. Hasenclever

Publications and source records attributed to H.F. Hasenclever.

3 recordsLinked to original sources

USGS1974

Seasonal variation of the upper digestive tract yeast flora of feral pigeons

Feral pigeons were sampled over a 16-month period to determine whether their normal yeast flora varied according to season. Candida albicans and Saccharomyces telluris occurred during the entire sampling period, with C. albicans reaching its highest levels between August and January and S. telluris peaking from March through May. Candida krusei was present for 10 months but exhibited no predictable variation in density. Candida tropicalis , C. guilliermondii and Geotrichum were isolated on several occasions while C. lusitaniae , C. pseudotropicalis and Torulopsis glabrata were each isolated once. The high levels of infection and frequency of occurrence of some yeast species make the feral pigeon highly suspect as a carrier and disseminator of potentially pathogenic yeast.

Journal of Wildlife Diseases↗

USGS1973

Serotypes in Saccharomyces telluris: Their relation to source of isolation

Three serotypes have been characterized with three reference strains of Saccharomyces telluris and designated as A, B, and C. One reference strain of Torpulopsis bovina , the imperfect form of S. telluris , belonged to serotype B. Strains (141) of S. telluris isolated from four columbid species were serotyped. All 98 strains of this yeast isolated from Columba livia (feral pigeon) belonged to serotype B. Three other columbid species, C. leucocephala (white-crowned pigeon), C. fasciata (band-tailed pigeon), and Zenaidura macroura (mourning dove) harbored strains of serotype C only. Serotype A was not isolated from any of the avian species.

Infection and Immunity↗

USGS1972

Normal yeast flora of the upper digestive tract of some wild columbids

Seven species of pigeons and doves were cultured for yeasts in the upper digestive tract. The following list gives the isolation rate for each columbid species and the yeasts cultured from them: feral pigeon Colwnha livia (Gmelin) 95% — Candida albicans (Robin) Berkhout, C. tropicalis (Castellani) Berkhout, C. krusei (Cast.) Berkhout, C. guilliermondii (Cast.) Langeron et Guerra, Torulopsis glabrata (Anderson) Lodder et De Vries, Saccharomyces telluris Van der Walt, and Geotrichum sp.; white-crowned pigeon ( C. leucocephala Linnaeus) 56% — S. telluris ; mourning dove ( Zenaidura macroura Linnaeus) 24% — C. albicans , C. tropicalis , C. guilliermondii , and Geotrichum sp.; passerine ground dove ( Collumbigallina passerina Linnaeus) 20% — C. parapsilosis (Ashford) Langeron et Talice, Kloeckera apiculata (Reess Emend. Klocker) Janke; zenaida dove ( Zenaida auritu Temminck) 16% — C. albicans , C. guilliermondii , and T. glabrata ; one moustasche dove ( Geotrygon mystacea Gosse) — C. guilliermondii ; ringed turtle dove ( Streptopelia rizoria Linnaeus) 14% — C. albicans and Geotrichum sp. No signs of disease could be seen in the 139 birds that were examined, and it was concluded that these yeasts comprise a part of the columbid's normal microbial flora.

Journal of Wildlife Diseases↗