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Solomon, Christopher T.; Bruesewitz, Denise A.; Richardson, David C.; Rose, Kevin C.; Van de Bogert, Matthew C.; Hanson, Paul C.; Kratz, Timothy K.; Larget, Bret; Adrian, Rita; Babin, Brenda Leroux; Chiu, Chih-Yu; Hamilton, David P.; Gaiser, Evelyn E.; Hendricks, Susan; Istvánovics, Vera; Laas, Alo; O’Donnell, David M.; Pace, Michael L.; Ryder, Elizabeth; Staehr, Peter A.; Torgersen, Thomas; Vanni, Michael J.; Weathers, Kathleen C.; Zhu, Guangwei
Limnology and oceanography, 20/May , Letnik: 58, Številka: 3Journal Article
We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers of ecosystem metabolism. We estimated daily rates of respiration and gross primary production (GPP) for up to a full year in each lake, via maximum likelihood fits of a free-water metabolism model to continuous high-frequency measurements of dissolved oxygen concentrations. Uncertainties were determined by a bootstrap analysis, allowing lake-days with poorly constrained rate estimates to be down-weighted in subsequent analyses. GPP and respiration varied considerably among lakes and at seasonal and daily timescales. Mean annual GPP and respiration ranged from 0.1 to 5.0 mg O2 L−1 d−1 and were positively related to total phosphorus but not dissolved organic carbon concentration. Within lakes, significant day-to-day differences in respiration were common despite large uncertainties in estimated rates on some lake-days. Daily variation in GPP explained 5% to 85% of the daily variation in respiration after temperature correction. Respiration was tightly coupled to GPP at a daily scale in oligotrophic and dystrophic lakes, and more weakly coupled in mesotrophic and eutrophic lakes. Background respiration ranged from 0.017 to 2.1 mg O₂ L−1 d−1 and was positively related to indicators of recalcitrant allochthonous and autochthonous organic matter loads, but was not clearly related to an indicator of the quality of allochthonous organic matter inputs.
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