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ALGAL BIOASSAY AND GROSS PRODUCTIVITY EXPERIMENTS USING SEWAGE EFFLUENT IN A MICHIGAN WETLAND'
Author(s) -
Richardson Curtis J.,
Schweglei Benedict R.
Publication year - 1986
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1986.tb01866.x
Subject(s) - cladophora , effluent , phosphorus , productivity , nutrient , periphyton , biomass (ecology) , bioassay , sewage , environmental science , zoology , dry weight , environmental chemistry , nitrogen , biology , algae , ecology , agronomy , chemistry , environmental engineering , macroeconomics , organic chemistry , economics
One component of the filamentous algal community of a northern fen ecosystem in central Michigan was studied under conditions of nutrient enrichment by secondarily treated sewage effluent during one growing season. The productivity of Cladophora spp. measured by continuous flow bioassay was 2.6 g dry weight m day at the site of effluent addition compared to 0.085 g m day at the control site. Under conditions of nutrient enrichment, uptake by bioassay Cladophora spp. averaged 12 mg m −2 day −1 for phosphorus and 55 mg m −2 day −1 for nitrogen, compared to 0.01 mg m − 2 day −1 and 0.16 mg m −2 day −1 for phosphorus and nitrogen, respectively, in the control area. At the end of the growing season approximately 4.3 g N m − 2 and 0.96 g P m −2 were immobilized in Cladophora algal biomass. Algal growth temporarily immobilized 3.0 percent of the nitrogen and 1.0 percent of the phosphorus added as sewage effluent. Gross productivity of surface water in the fen averaged 1.5 g O 2 m −2 day −1 at the nutrient enriched site, compared to 0.5 g O 2 m −2 day −1 at the control area. Gross productivity, community respiration and reaeration constant values in the fen were similar to data collected by other researchers in shallow water aquatic systems, but only at the fertilized sites.