Beitrag
Seasonal changes of subantarctic heterotrophic bacterioplankton
Delille, D.
Archiv für Hydrobiologie Volume 119 Number 3 (1990), p. 267 - 277
40 Literaturangaben
veröffentlicht: Oct 15, 1990
DOI: 10.1127/archiv-hydrobiol/119/1990/267
ArtNo. ESP141011903002, Preis: 29.00 €
Abstract
During a two-year period systematic observations of the heterotrophic bacterial population were recorded from a nearshore seawater station in the Kerguelen Archipelago. A weekly survey including physiochemical measurements (temperature and particulate organic matter), total bacterial counts (AODC) and culturable bacteria (MPN on ZoBell medium) determinations was conducted. Potential heterotrophic bacterial activities were estimated by 14C glucose and 14C glutamic acid uptake measurements. The bacterial community structure was investigated by carrying out 29 morphological and biochemical tests on 1579 isolated strains. Quantitative data were treated by principal component analysis. Qualitative data were analysed by a numerical taxonomic technique. The results suggest a close coupling between bacterial heterotrophic microflora and trophic resources. All periods of organic enrichment of the coastal seawater studied led to significant increases of both bacterial number and their activity. Although non-fermentative Gram-negative rods were always dominant, the existence of a succession of populations during bacterial growth resulting from periodical organic enrichments is clearly demonstrated. The possible presence of degenerative forms of gram negative rods is discussed.
Schlagworte
AODC • MPN • ZoBell medium • organic enrichment • rods • Kerguelen Archipelago