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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Microbial breathing lessons

Article Abstract:

Researchers led by P.A. del Giorgio conclude that bacterial respiration exceeds primary production in bodies of water. It claims that when primary production drops below 100 (mu)C1(-1) d(-1), bacteria consumption exceeds phytoplankton produce. As evidence, del Giorgio compared data on bacterial respiration and bacterial production. However, study results can become problematic with the open ocean where dissolved organic matter mostly come from marine sources.

Author: Kirchman, David L.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997

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Photosynthesis or planktonic respiration?

Article Abstract:

Scientists Paul A. del Giorgio et al believe that planktonic bacteria living in the euphotic zone of the oligotrophic sea undergo respiration more than photosynthesis. They calculate the level of bacterial respiration using a respiratory quotient of 1.0 carbon dioxide per oxygen consumed. However, scientist Richard J. Geider believes that a net heterotrophic environment does not exist in the ocean although it may very well exist in lakes.

Author: Cole, Jonathan J., Geider, Richard J., del Giorgio, Paul A.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
Measurement, Environmental aspects, Bacteria, Heterotrophic, Heterotrophic bacteria, Bacteria, Photosynthetic, Photosynthetic bacteria

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Respiration rates in bacteria exceed phytoplankton production in unproductive aquatic systems

Article Abstract:

Bacterial respiration exceeds primary production in aquatic systems with less than 70 to 120 (mu)g carbon per liter daily. This implies that the biological system is a source of carbon dioxide in unproductive systems. Bacterial growth efficiency, which is the result of bacterial production and respiration, must range from less than 10% to 25% in most aquatic systems. This range falls below the values assumed in modern ecological models.

Author: Cole, Jonathan J., del Giorgio, Paul A., Cimbleris, Andre
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997

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Subjects list: Analysis, Primary productivity (Biology), Microbial respiration, Carbon cycle (Biogeochemistry), Carbon cycle, Marine microbiology
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