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Carter Lake, Pottawattamie County

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Carter Lake, Pottawattamie County


Record 1 of 5 in Biological Abstracts 2000/07-2000/12
TI: Remote detection and seasonal patterns of phycocyanin, carotenoid and chlorophyll pigments in eutrophic waters.
AU: Schalles-John-F {a}; Yacobi-Yosef-Z
SO: Ergebnisse-der-Limnologie. 2000; (55): 153-168..
IS: 0071-1128
LA: English
AB: High spectral resolution water reflectance measurements were made on more than 80 dates between 1994 and 1998 in Carter Lake, a hypereutrophic floodplain lake in Nebraska, USA. Ranges and mean values of pigment fractions (concentrations as mugcntdotL-1) were - phycocyanin c: 10-530 (mean 140); total carotenoids: 17-87 (mean 42); and Chlorophyll a: 31-290 (mean 105). Phycocyanin was readily detectable from absorbance near 625 nm in reflectance spectra. A semi-empirical equation using a ratio of reflectance values for a local peak near 650 and the trough feature near 625 nm appears to be an effective predictor of phycocyanin. Relationships between carotenoids and reflectance were weaker but evident near 500 nm. The algal community oscillated between diatom dominance from April through June to cyanobacteria dominance from July through December. The peak position of green light reflectance varied from 552 to 577 nm and was inversely related to phycocyanin (r2 = 0.83) and the peak of NIR reflectance varied from 696 to 713 nm and was positively related to Chlorophyll a (r = 0.817). The positions of both peaks had orderly, seasonal cycles coincident with bloom dynamics and taxonomy.
AN: 200000178145

Record 2 of 5 in Biological Abstracts 1998/01-1998/06
TI: Estimation of chlorophyll a from time series measurements of high spectral resolution reflectance in an Eutrophic Lake.
AU: Schalles-John-F {a}; Gitelson-Anatoly-A; Yacobi-Yosef-Z; Kroenke-Amy-E
SO: Journal-of-Physiology. April, 1998; 34 (2) 383-390..
IS: 0022-3646
LA: English
AB: We acquired high spectral resolution reflectance data in Carter Lake, a eutraphic oxbow on the Iowa-Nebraska border, from April 1995 to April 1996. Chlorophyll a, total seston, sestonic organic matter, Secchi depth, and nephelometric turbidity were determined for each respective spectral measurement. Changes in algal taxonomic structure and abundance coincided with the development and senescence of a midsummer through autumn bloom of Anabaena. Taxonomic structure was more diverse in late winter and spring when Synedra sp. (diatom) and several chlorophytes and dinoflagellates were present. Overall, chlorophyll a varied from about 20 to 280 mugcntdotL-1, Secchi transparency from 18 to 74 cm, and seston day weight from 11 to 48 mgcntdotL-1 in February and September, respectively. Particulate matter completely dominated take water light attenuation. Dissolved organic matter had low optical activity. The most sensitive spectral feature to variation in chlorophyll a concentration was the magnitude of the scattering peak near 700 nm. The 700-nm peak correlated to chlorophyll concentration through the relationships between algal pigment absorption near 670 nm and the cell biomass and surface-related scattering signal in the near infrared. An algorithm relating the height of the 700-nm reflectance peak above a reference baseline between 670 and 850 nm to chlorophyll a was accurate and robust despite large variations in optical constituents caused by both strong seasonality in the algal system and short-term variations in seston from wind-induced sediment resuspension. The present algorithms were successfully used in other systems with different seasonality and productivity patterns. The coefficients of the models relating chlorophyll a and spectral reflectance variables appeared to be ecosystem specific: both the intercept and slope for the models in this study were moderately lower than for several other recently published results. We validated our algorithm coefficients with a second, independent dataset. The standard error for chlorophyll a prediction was +-28 mugcntdotL-1.
AN: 199800254664


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