caa a22 4500 397552696 CHVBK 20180308164754.0 cr unu---uuuuu 161202e199603 xx s 000 0 eng 10.1111/j.1574-6941.1996.tb00213.x doi (NATIONALLICENCE)oxford-10.1111/j.1574-6941.1996.tb00213.x Bacterial activity and production in near-surface estuarine and freshwater sediments [Elektronische Daten] [Peter Wellsbury, Rodney A. Herbert, R. John Parkes] Two indices of bacterial production, thymidine incorporation and the frequency of divided and dividing cells were measured, along with a suite of measurements of aerobic and anaerobic bacterial activity, to investigate the relationship between bacterial cell production and organic carbon mineralisation at three different sediment sites: a sheltered intertidal estuarine mudflat (Kingoodie Bay), a riverside mudbank (Ashleworth Quay) and an intertidal mudflat in a hydraulically dynamic estuary (Aust Warth). Organic carbon mineralisation was dominated by anaerobic processes at all three sites: sulfate reduction at the two estuarine sites (equivalent to 76% and 61% of oxygen uptake) and methanogenesis at the freshwater site (56%). Although all three sites had similar bacterial population sizes, activities in Kingoodie Bay were 2-3 times higher than at Aust Warth or Ashleworth Quay. Thymidine incorporation rates and Numbers of Dividing and Divided Cells correlated strongly at all three sites. Thymidine incorporation rates were spatially uncoupled from zones of principal anaerobic activity, providing in situ evidence that sulfate-reducing bacteria and methanogens do not incorporate radiolabelled thymidine into DNA during growth. Cell yield was lower in the anaerobic zone, as subsurface peaks in anaerobic mineralisation were not matched by increases in bacterial productivity. However, as anaerobic degradation processes were so dominant, anaerobic productivity still accounted for the majority of cell production. © 1996 Federation of European Microbiological Societies. All rights reserved Bacterial production nationallicence Organic carbon mineralisation nationallicence Thymidine incorporation nationallicence Sulfate reduction nationallicence Methanogenesis nationallicence Aquatic sediment nationallicence Wellsbury Peter Department of Geology, University of Bristol, Bristol, UK aut Herbert Rodney A. Department of Biological Sciences, University of Dundee, Dundee, UK aut Parkes R. John Department of Geology, University of Bristol, Bristol, UK aut FEMS Microbiology Ecology Blackwell Publishing Ltd 19/3(1996-03), 203-214 19:3<203 1996 19 femsec https://doi.org/10.1111/j.1574-6941.1996.tb00213.x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1111/j.1574-6941.1996.tb00213.x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wellsbury Peter Department of Geology, University of Bristol, Bristol, UK aut NATIONALLICENCE 700 1- Herbert Rodney A. Department of Biological Sciences, University of Dundee, Dundee, UK aut NATIONALLICENCE 700 1- Parkes R. John Department of Geology, University of Bristol, Bristol, UK aut NATIONALLICENCE 773 0- FEMS Microbiology Ecology Blackwell Publishing Ltd 19/3(1996-03), 203-214 19:3<203 1996 19 femsec Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford