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15 January 2013 Benthic organic carbon release stimulates bacterioplankton production in a clear-water subarctic lake
Patricia Rodríguez, Jenny Ask, Catherine L Hein, Mats Jansson, Jan Karlsson
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Abstract

We carried out a set of experiments in a small clear-water lake in northern Sweden during summer 2010 to assess the effect of organic C (OC) released from epipelic algae on pelagic bacterial production (BP). The release rate of OC (dissolved and particulate) from epipelic algae was ∼45.4 ng C m−2 h−1. Bacterioplankton uptake of dissolved OC was P-limited, and pelagic primary production (PP) was colimited by N and P. Pelagic BP (3.2 ± 6 µg C L−1 h−1) exceeded pelagic PP (0.012 ± 0.008 µg C L−1 h−1). Pelagic BP was higher in lake water in contact with sediments and the epipelic algae growing on their surface than in water separated from the sediments. Epipelic algae release OC to lake water and potentially stimulate pelagic BP. However, exploitation of benthic OC probably is suboptimal because of nutrient limitation (primarily by inorganic P) of BP.

The Society for Freshwater Science
Patricia Rodríguez, Jenny Ask, Catherine L Hein, Mats Jansson, and Jan Karlsson "Benthic organic carbon release stimulates bacterioplankton production in a clear-water subarctic lake," Freshwater Science 32(1), 176-182, (15 January 2013). https://doi.org/10.1899/12-005.1
Received: 13 January 2012; Accepted: 1 November 2012; Published: 15 January 2013
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