Factors controlling the lipid composition of marine planktonic Thaumarchaeota
Veröffentlichungsdatum
2015-08-13
Autoren
Betreuer
Gutachter
Zusammenfassung
Marine ammonia-oxidizing archaea of the phylum Thaumarchaeota synthesize glycerol dibiphytanyl glycerol tetraether (GDGT) membrane lipids that are used as for the reconstruction of sea surface temperatures by means of the TEX86 paleothermometer. Discrepancies between observed and predicted TEX86-temperatures throughout the global ocean indicate that the physiological and ecological controls on lipid composition in planktonic Thaumarchaeota remain poorly understood. In this thesis, the influence of growth phase, temperature, pH, and salinity on the membrane lipid composition of Thaumarchaeota were investigated. The results indicate that TEX86 is not only influenced by temperature but similarly by growth phase and community composition, which compromises its utility as a paleothermometer. A comprehensive study of the lipidomes of 11 thaumarchaeal cultures revealed that Thaumarchaeota contain a high diversity of membrane lipids that is related to phylogeny as well as growth characteristics. This analysis further revealed that all Thaumarchaeota contain the specific biomarkers crenarchaeol, methoxy archaeol, and saturated menaquinone-6.
Schlagwörter
Thaumarchaeota
;
TEX86
;
paleotemperature
;
sea surface temperature
;
proxy
;
paleothermometer
;
paleoceanography
;
Archaea
;
Ammonia-oxidizing archaea
;
GDGT
;
Crenarchaeol
;
Nitrosopumilus maritimus
;
Respiratory quinones
;
IPL
;
Membrane lipids
;
intact polar lipids
;
biosynthesis
;
lipidome
;
menaquinone
;
glycerol dibiphytanyl glycerol tetraether
Institution
Fachbereich
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
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