@article{abe57a6d-0bbe-4c4f-8fec-d426a16af791,
author = {O. Roger Anderson},
title = {Microbial Respiration of Organic Carbon in Freshwater Microcosms: The Potential for Improved Estimation of Microbial CO2 Emission from Organically Enriched Freshwater Ecosystems},
journal = {Acta Protozoologica},
volume = {2016},
number = {Volume 55, Issue 3},
year = {2016},
issn = {0065-1583},
pages = {189-196},keywords = {Aquatic microbial CO2 emissions; atmospheric CO2; climate change; environmental change; organic aquatic pollution; protists},
abstract = {Respiratory CO2 emissions from laboratory freshwater microcosms enriched with organic C (glucose and amino acids) and kept in the dark at 24°C were compared to control microcosms without C enrichment for two different freshwater pond sources. The purpose was to estimate experimentally the rate of respiratory CO2 emission from organically polluted freshwater ecosystems compared to non-enriched water. Experiment One, used pond water collected at the Lamont-Doherty Earth Observatory campus; and Experiment Two used pond water, inoculated with natural detritus, obtained from North Carolina. At peak respiration, the net efflux of CO2 (enriched minus control) to the atmosphere was ~ 90 nmol min–1 L–1 (Day 7, Experiment One) and ~ 240 nmol min–1 L–1 (Day 3, Experiment Two). The corresponding net efflux of C to the atmosphere was 25 nmol C min–1 L–1 (Day 7, Experiment One) and 65 nmol C min–1 L–1 (Day 3, Experiment Two). Peak CO2 emissions from the organic-enriched microcosms expressed as μmol m–2 s–1 (as more typically reported for natural bodies of water) were 0.20 for Experiment One, and 0.42 for Experiment Two, at a surface layer depth of approx. 20 cm, i.e. the microcosm depth. There was a relatively large correlation between respiratory CO2 emission and bacterial densities in the organic-C enriched microcosms (r = 0.76), but a smaller correlation (r = 0.32) in the non-enriched, control microcosm. Further broad scale research, robustly sampling natural bodies of organically polluted water, is needed to confirm and better establish the results of the research reported here using microcosms.},
doi = {10.4467/16890027AP.16.018.5750},
url = {https://ejournals.eu/en/journal/acta-protozoologica/article/microbial-respiration-of-organic-carbon-in-freshwater-microcosms-the-potential-for-improved-estimation-of-microbial-co2-emission-from-organically-enriched-freshwater-ecosystems}
}