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dc.contributorVirginia Tech
dc.contributor.authorFairchild, G. W.
dc.contributor.authorLowe, R. L.
dc.contributor.authorRichardson, W. B.
dc.date.accessioned2014-03-27T13:06:00Z
dc.date.available2014-03-27T13:06:00Z
dc.date.issued1985
dc.identifier.citationG. Winfield Fairchild, Rex L. Lowe, and William B. Richardson 1985. Algal Periphyton Growth on Nutrient-Diffusing Substrates: An in situ Bioassay. Ecology 66:465-472. http://dx.doi.org/10.2307/1940395
dc.identifier.issn0012-9658
dc.identifier.urihttp://hdl.handle.net/10919/46819
dc.description.abstractDifferences in nutrient limitation for dominant species within an algal periphyton community were determined using additions of N and P supplied by nutrient-diffusing artificial substrates. Sealed clay flowerpots were filled with 2% agar and one of nine nutrient treatments (all combinations of K2HPO4 at 0.0, 0.05, and 0.5 mol/L with NaNO3 at 0.0, 0.05, and 0.5 mol/L). The pots were submerged at 0.5 m depth in Douglas Lake, Michigan, and diffused N and P to their outer surfaces in proportion to internal concentrations. After 51 d the pots were scraped and analyzed for attached algae. Total algal biomass as chlorophyll a on the pots ranged from 0.17 - 0.02 (SE) mg/cm2 for pots without added nutrients to 15.7 - 2.0 mg/cm2 for pots with K2HPO4 at 0.05 mol/L and NaNO3 at 0.5 mol/L. chlorophyll a on pots containing just P (0.05, 0.5 mol/L) increased 6- to 10-fold over controls. The diatoms Epithemia adnata and Rhopalodia gibba and the blue-green alga Anabaena increased significantly on the P-only pots; these species are suspected of N-fixing capability. Chlorophyll a on pots containing just N (0.05 mol/L) increased 1.5- to 2-fold, though this increase was nonsignificant; Achnanthes minutissima, Gomphonema tenellum, and Cocconeis placentula showed enhanced growth on these pots. Combinations of N and P caused heavy growth of the filamentous alga Stigeoclonium tenue. Naviculoid diatoms were also most abundant on the N + P pots. Average nutrient levels in Douglas Lake during the study were: NH3, 2.02 _mol/L; NO3, 0.44 _mol/L; and PO4, 0.06 _mol/L. The low ambient concentrations of both N and P, together with results of the periphyton bioassay, indicate that the two nutrients may jointly limit overall growth, and that the form of growth limitation differs by species within the periphyton community.
dc.language.isoen_US
dc.publisherEcological Society of America
dc.subjectalgal growth
dc.subjectbioassay
dc.subjectnitrogen
dc.subjectnitrogen flxation
dc.subjectnutrient limitation
dc.subjectperiphyton
dc.subjectphosphorus
dc.titleAlgal periphyton growth on nutrient-diffusing substrates: an in situ bioassay
dc.typeArticle - Refereed
dc.identifier.urlhttp://www.jstor.org/stable/1940395
dc.date.accessed2014-03-11
dc.title.serialEcology
dc.identifier.doihttps://doi.org/10.2307/1940395


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