title: SPECIES-SPECIFIC VARIATION IN FATTY ACID CONCENTRATIONS OF FOUR PHYTOPLANKTON SPECIES: DOES PHOSPHORUS SUPPLY INFLUENCE THE EFFECT OF LIGHT INTENSITY OR TEMPERATURE?(1).
abstract: We tested, in the laboratory, the influence of light intensity, temperature, and phosphorus (P) supply on fatty acid (FA) concentrations of four freshwater algae: the green algae Scenedesmus quadricauda (Turpin) Bréb. and Chlamydomonas globosa J. Snow, the cryptophyte Cryptomonas ovata Ehrenb., and the diatom Cyclotella meneghiniana Kütz. We investigated the main and interactive effects of two variables on algal FA concentrations (i.e., light intensity and P supply or temperature and P supply). Interactive effects of light intensity and P supply were most pronounced in C. meneghiniana, but were also found in S. quadricauda and C. ovata. Changes in several saturated and unsaturated FA concentrations with light were more distinct in the low-P treatments than in the high-P treatments. Interactive effects of temperature and P supply on various FA concentrations were observed in all four species, but there was no consistent pattern. In lake ecosystems, P limitation often coincides with high light intensities and temperatures in summer. Therefore, it is important to examine how combinations of these environmental conditions affect FA concentrations of primary producers that are important sources of FAs for higher trophic levels.
authors.affiliation: Institute of Biochemistry and Biology, Theoretical Aquatic Ecology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, GermanyEnvironment Canada, National Water Research Institute, 867 Lakeshore Road, PO Box 5050, Burlington, Ontario L7R 4A6, CanadaInstitute of Biochemistry and Biology, Theoretical Aquatic Ecology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.
authors.forename: Maike
authors.initials: M
authors.lastname: Piepho
authors.affiliation: Institute of Biochemistry and Biology, Theoretical Aquatic Ecology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, GermanyEnvironment Canada, National Water Research Institute, 867 Lakeshore Road, PO Box 5050, Burlington, Ontario L7R 4A6, CanadaInstitute of Biochemistry and Biology, Theoretical Aquatic Ecology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.
authors.forename: Michael T
authors.initials: MT
authors.lastname: Arts
authors.affiliation: Institute of Biochemistry and Biology, Theoretical Aquatic Ecology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, GermanyEnvironment Canada, National Water Research Institute, 867 Lakeshore Road, PO Box 5050, Burlington, Ontario L7R 4A6, CanadaInstitute of Biochemistry and Biology, Theoretical Aquatic Ecology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Wacker
keywords: Chlamydomonas; Cryptomonas; Cyclotella; PUFA; Scenedesmus; fatty acids; light; lipids; phosphate; temperature