Distribution of epipelic algal communities in an oligotrophic Adirondack lake
Thesis/Dissertation
·
OSTI ID:6995509
The biovolume and species composition of algae on the sediment along depth gradients were determined before and after artificial neutralization of an oligotrophic lake in the Adirondack Park in New York State. The epipelic algal community of Woods Lake (Herkimer Co., NY) was dominated by diatoms and cyanobacteria prior to and following liming. Distinct depth-zonation patterns of community composition were evident and unaffected by the base (CaCO/sub 3/) addition. Prior to liming, there was an increase in total algal biovolume with depth, due to the presence of a dense cyanobacterial community on the sediments in deeper water (5 m to 8 m). This mat was dominated by a single species of cyanobacteria, Hapalosiphon pumilus, which accounted for the late summer maximum in total biovolume at 7 m. The shallower (1 m-4 m) epipelic communities were dominated by diatoms, which showed a spring maximum in total biovolume. Woods Lake, one of the sites of the Lake Acidification Mitigation Project (LAMP), was treated with CaCO/sub 3/ on May 31, 1985. Among other physical and chemical changes, the base treatment increased the pH from 5.0 to above 9.0, ANC from 0 to > 400 ..mu..eq/L. Water clarity was reduced immediately after liming and cleared gradually over an eight-week period.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA)
- OSTI ID:
- 6995509
- Country of Publication:
- United States
- Language:
- English
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