Molecular fossil evidence for anaerobic ammonium oxidation in the Arabian Sea over the last glacial cycle
作者： Andrea Jaeschke , Martin Ziegler , Ellen C. Hopmans , Gert-Jan Reichart , Lucas J. Lourens
DOI: 10.1029/2008PA001712
关键词:
摘要: Anaerobic ammonium oxidation (anammox) has been recognized as an important process converting fixed nitrogen to N2 in many marine environments, thereby having a major impact on the present‐day cycle. However, essentially nothing is known about importance of anammox past cycles. In this study, we analyzed distribution fossil ladderane lipids, derived from bacteria performing anammox, sediment core northern Arabian Sea. Concentrations lipids varied between 0.3 and 5.3 ng g−1 during 140 ka, with high values observed Holocene, intervals last glacial, penultimate interglacial. Maxima lipid abundances correlate total organic carbon (4–6%) elevated δ 15N (>8‰) values. Anammox activity, therefore, seems enhanced periods characterized by intense oxygen minimum zone (OMZ). Low concentrations ladderanes (<0.5 sediment), indicating low‐anammox coincide which OMZ was severely diminished. Since activity covaried intensity, it may play role loss inorganic global ocean glacial‐interglacial timescales, so far attributed only heterotrophic denitrification.
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