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Lake-wide phytoplankton production and abundance in the Upper Great Lakes: 2010–2013
Ist Teil von
Journal of Great Lakes research, 2016-06, Vol.42 (3), p.619-629
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Lake-wide phytoplankton chlorophyll a concentrations and primary production were determined for lakes Huron, Michigan, and Superior in 2010–2013. Chlorophyll a concentrations were determined using MODIS imagery with a color-producing agent algorithm and primary production with the Great Lakes Production Model using remotely sensed and empirically derived input from the Upper Great Lakes. The new chlorophyll a and primary production estimates agreed well with field measurements. Lake-wide mean chlorophyll a concentrations determined from observations in all 12months were highest in Lake Superior (mean=0.99mg/m3), intermediate in Lake Michigan (mean=0.88mg/m3), and lowest in Lake Huron (mean=0.77mg/m3). In Lake Superior, a gradient in chlorophyll a concentrations was noted from the shallow zone (0–30m, mean=1.57mg/m3) to the deep-water zone (>150m, mean=0.94mg/m3). However, in Lake Michigan, no differences in mean chlorophyll a concentrations were noted in shallow-, mid-, or deep-water zones (means, 0.83, 0.86, 0.90mg/m3, respectively). Lake-wide areal integrated primary production rates in lakes Huron, Michigan, and Superior were not significantly different for the 2010–2013 period (means, 216, 259, and 228mg C/m2/d, respectively). Also, primary production in all depth zones (shallow, mid, and deep) were similar across lakes. Annual whole-lake phytoplankton carbon fixation values for 2010–2013 ranged from 4.4 to 5.7Tg/y for Lake Huron, 5.0–7.2Tg/y for Lake Michigan, and 6.4–9.5 Tg/y for Lake Superior.