Abstract
Periphyton biovolume and cell densities increased significantly with both nitrogen and phosphorus enrichment but were not affected by shading. Phosphorus enrichment increased periphyton accumulation only when N levels were high, indicating a significant interactive effect between N and P. Differences in species composition among treatments were mostly due to changes in the diatoms Nitzschia palea and Rhopalodia gibba. Ambient and phosphorus-enriched substrates were dominated by R. gibba, which contains a nitrogen-fixed endosymbiont, and blue-green aglae. Nitrogen enrichment and N and P in combination resulted in an assemblage dominated by N. palea. Unshaded and highly shaded substrates were dominated by N. palea and Achnanthes minutissima, but the medium-shade substrates were dominated by R. gibba. -from Authors
Original language | English (US) |
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Pages (from-to) | 1270-1278 |
Number of pages | 9 |
Journal | Canadian Journal of Fisheries and Aquatic Sciences |
Volume | 50 |
Issue number | 6 |
DOIs | |
State | Published - 1993 |
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Aquatic Science