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.
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.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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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.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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