Knapp, Charles W. and Graham, David W. and Steedman, Robert J. and deNoyelles, Frank (2003) Deep chlorophyll maxima in small boreal forest lakes after experimental catchment and shoreline logging. Boreal Environment Research, 8 (1). pp. 9-18.
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In situ profiles of chlorophyll fluorescence combined with depth-specific water chemistry and biotic analysis were used to assess deep chlorophyll maxima (DCM) in four boreal shield lakes that were subjected to different levels of watershed disturbance by clear-cut logging. Phytoplankton communities within the DCPvl varied among lakes, but were generally comprised of chrysophytes, diatoms, and cryptophytes. One lake also had deep cyanobacterial populations. Relative in situ fluorescence (absolute fluorescence at each peak minus background fluorescence) at the fluorescence peaks was significantly correlated with the level of chlorophyll a at the peak (r(2) = 0.81, p < 0.025) for all lakes. In general, DCM peak heights were consistent in each lake over the four-year post-logging sampling period, whereas DCM depths declined slightly in the most heavily logged takes associated with increases in dissolved organic carbon. Therefore, on the basis of DCM data, only mild effects on lake water quality were apparent after the logging activity.
|Keywords:||deep chlorophyll maxima, boreal forest lakes, experimental catchment, shoreline logging, Science (General), Microbiology, Pollution, Ecological Modelling, Agricultural and Biological Sciences (miscellaneous), Atmospheric Science|
|Subjects:||Science > Science (General)
Science > Microbiology
|Department:||Faculty of Engineering > Civil and Environmental Engineering|
|Depositing user:||Dr Charles W Knapp|
|Date Deposited:||10 Mar 2010 15:54|
|Last modified:||06 Jan 2017 19:49|