Deep chlorophyll maxima in small boreal forest lakes after experimental catchment and shoreline logging

Charles W. Knapp, David W. Graham, Robert J. Steedman, Frank deNoyelles

Research output: Contribution to journalArticle

6 Citations (Scopus)
63 Downloads (Pure)

Abstract

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.
Original languageEnglish
Pages (from-to)9-18
Number of pages9
JournalBoreal Environment Research
Volume8
Issue number1
Publication statusPublished - Mar 2003

Fingerprint

Chlorophyll
Lakes
boreal forests
Catchments
boreal forest
logging
shoreline
chlorophyll
fluorescence
catchment
lakes
Fluorescence
lake
Diatoms
Phytoplankton
Bacillariophyceae
water chemistry
Water Quality
lake water
dissolved organic carbon

Keywords

  • deep chlorophyll maxima
  • boreal forest lakes
  • experimental catchment
  • shoreline logging

Cite this

Knapp, Charles W. ; Graham, David W. ; Steedman, Robert J. ; deNoyelles, Frank. / Deep chlorophyll maxima in small boreal forest lakes after experimental catchment and shoreline logging. In: Boreal Environment Research. 2003 ; Vol. 8, No. 1. pp. 9-18.
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Deep chlorophyll maxima in small boreal forest lakes after experimental catchment and shoreline logging. / Knapp, Charles W.; Graham, David W.; Steedman, Robert J.; deNoyelles, Frank.

In: Boreal Environment Research, Vol. 8, No. 1, 03.2003, p. 9-18.

Research output: Contribution to journalArticle

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T1 - Deep chlorophyll maxima in small boreal forest lakes after experimental catchment and shoreline logging

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AU - Graham, David W.

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AB - 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.

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