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Constraining bacterial production, conversion efficiency and respiration in the Ross
- Estuar. Coast. Shelf Sci
, 2000
"... Abstract Bacteria consume dissolved organic carbon at rates averaging about 50% of primary production across a wide spectrum of marine ecosystems. However, total utilization rates are poorly constrained due to a lack of data on conversion e$ciencies and/or bacterial respiration rates. We estimated ..."
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Abstract Bacteria consume dissolved organic carbon at rates averaging about 50% of primary production across a wide spectrum of marine ecosystems. However, total utilization rates are poorly constrained due to a lack of data on conversion e$ciencies and/or bacterial respiration rates. We estimated total community dark respiration rates (DCR) from in vitro oxygen utilization and estimated bacterial production from H-leucine incorporation during January}February 1997 in the Ross Sea, Antarctica. Bacterial respiration rates (BR) were estimated by assuming that BR was less than some fraction of DCR, and by choosing values for the bacterial growth e$ciency. By comparing these derived bacterial respiration rates with the DCR we were able to constrain conversion e$ciency and bacterial production within various bounds. Bacterial biomass was 10% of phytoplankton stocks, and we considered that bacterial respiration was a similar fraction of the total respiration. To meet this constraint bacterial production rates likely averaged about 5}10% of the net community production, and conversion e$ciencies had to be in the range of 35}45%, similar to independent discrete measurements made during the summer season on this cruise. Dark respiration rates are an absolute constraint on the estimates of bacterial carbon demand. A low value of the leucine conversion factor (1.5 kgC mol\) was required to meet this strong constraint.
unknown title
, 2001
"... www.elsevier.com/locate/ecolmodel A Bayesian hierarchical model to predict benthic oxygen demand from organic matter loading in estuaries and coastal zones ..."
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www.elsevier.com/locate/ecolmodel A Bayesian hierarchical model to predict benthic oxygen demand from organic matter loading in estuaries and coastal zones
FACTORS CONTROLLING BACTERIAL ABUNDANCE, BIOMASS AND GROWTH
, 1998
"... Copyright © and Moral Rights for this thesis are retained by the author and/or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This thesis cannot be reproduced or quoted extensively from without first obtaining permi ..."
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Copyright © and Moral Rights for this thesis are retained by the author and/or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder/s. The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders. When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given e.g.