Bacterioplankton, phytoplankton, and zooplankton communities in a British Columbia coastal lake before and after nutrient reduction

Inorganic nitrogen and phosphorus were applied weekly during the growing season from 1980 to 1982 and twice weekly in 1983 to Hobiton Lake, a warm monomictic coastal lake in British Columbia. The lake was not fertilized in 1984. Average numbers of bacteria during the growing season decreased from a high of 1.53 × 106∙mL−1 in the fertilized condition to 0.84 × 106∙mL−1 in the unfertilized condition. Chlorophyll a concentrations decreased from a maximum seasonal average of 2.69 μg∙L−1 (1981) to 1.30 μg∙L−1 (1984), and algal numbers decreased from 5.83 × 104∙mL−1 (1983) to 2.29 × 104∙mL−1 (1984). Although the numbers of phytoplankton in each size fraction (picoplankton, nanoplankton, or microplankton) decreased in the unfertilized condition, the greatest change was an almost fourfold decrease in picoplankton, which consisted of 90% cyanobacteria (primarily Synechococcus spp.). Abundance of the large diatoms Rhizosolenia spp. and Melosira spp. increased in 1984, resulting in an increase in average seasonal al...

[1]  B. C. Booth,et al.  Nanoplankton species predominant in the subarctic Pacific in May and June 1978 , 1982 .

[2]  U. Larsson,et al.  Fractionated phytoplankton primary production, exudate release and bacterial production in a Baltic eutrophication gradient , 1982 .

[3]  Paul W. Johnson,et al.  Phototrophic and apochlorotic components of picoplankton and nanoplankton in the north Atlantic: geographic, vertical, seasonal and diel distributions , 1985 .

[4]  D. Bird,et al.  Empirical relationships between bacterial abundance and chlorophyll concentration in fresh and marine waters , 1984 .

[5]  Ralph G. Johnson.  SALINITY OF INTERSTITIAL WATER IN A SANDY BEACH , 1967 .

[6]  D. Roff.  Reproductive Uncertainty and the Evolution of Iteroparity: Why Don't Flatfish Put All Their Eggs in One Basket? , 1981 .

[7]  K. Porter.  plant animal interface in freshwater ecosystems , 1977 .

[8]  J. Kalff,et al.  SIZE‐DEPENDENT PHOSPHORUS UPTAKE KINETICS AND CELL QUOTA IN PHYTOPLANKTON 1 , 1982 .

[9]  E. Stoermer,et al.  Importance of Picoplankton in Lake Superior , 1986 .

[10]  T. Berman.  Size fractionation of natural aquatic populations associated with autotrophic and heterotrophic carbon uptake , 1975 .

[11]  D. Caron,et al.  CHROOCOCCOID CYANOBACTERIA IN LAKE ONTARIO: VERTICAL AND SEASONAL DISTRIBUTIONS DURING 1982 1 , 1985 .

[12]  D. Schindler.  Evolution of phosphorus limitation in lakes. , 1977, Science.

[13]  M. Pace,et al.  Protozoa in Planktonic Food Webs1,2 , 1985 .

[14]  Colin S. Reynolds,et al.  The ecology of freshwater phytoplankton , 1984 .

[15]  H. Vanderploeg.  Seasonal Particle-Size Selection by Diaptomus sicilis in Offshore Lake Michigan , 1981 .

[16]  K. Hyatt,et al.  Responses of Sockeye Salmon (Oncorhynchus nerka) to Fertilization of British Columbia Coastal Lakes , 1985 .

[17]  D. J. Hall,et al.  Sugar‐coated Daphnia: A preservation technique for Cladocera1 , 1973 .

[18]  E. Laws.  The Importance of Respiration Losses in Controlling the Size Distribution of Marine Phytoplankton , 1975 .

[19]  S. Watson,et al.  Relationships between Nannoplankton and Lake Trophic Status , 1981 .

[20]  R. Vollenweider,et al.  Advances in defining critical loading levels for phosphorus in lake eutrophication. , 1976 .

[21]  M. J. Clark,et al.  The effects of heavy metal contamination on the aquatic biota of Buttle lake and the Campbell river drainage (Canada) , 1985, Archives of environmental contamination and toxicology.

[22]  J. Stockner,et al.  Periphyton biomass and species composition in 21 British Columbia lakes: seasonal abundance and response to whole-lake nutrient additions , 1984 .

[23]  J. G. Field,et al.  The Ecological Role of Water-Column Microbes in the Sea* , 1983 .

[24]  J. Stockner,et al.  Whole-Lake Fertilization Experiments in Coastal British Columbia Lakes: Empirical Relationships between Nutrient Inputs and Phytoplankton Biomass and Production , 1985 .

[25]  A. Austin,et al.  Evaluation of changes in a large oligotrophic wilderness park lake exposed to mine tailing effluent for 14 years: the phytoplankton , 1984 .

[26]  H. Paerl.  Ultraphytoplankton biomass and production in some New Zealand lakes , 1977 .

[27]  T. Fenchel.  Ecology of Heterotrophic Microflagellates. IV Quantitative Occurrence and Importance as Bacterial Consumers , 1982 .

[28]  J. Stockner,et al.  An Integration of Forest and Lake Fertilization: Transport and Transformations of Fertilizer Elements , 1984 .

[29]  Paul W. Johnson,et al.  Chroococcoid cyanobacteria in the sea: A ubiquitous and diverse phototrophic biomass1 , 1979 .

[30]  C. Burns.  THE RELATIONSHIP BETWEEN BODY SIZE OF FILTER‐FEEDING CLADOCERA AND THE MAXIMUM SIZE OF PARTICLE INGESTED , 1968 .