Light Climate and Metabolism of Nitella flexilis (L.) AG. In the Bottom Waters of Oligotrophic Lake Grane Langsø, Denmark

• Published in: Internationale Revue der gesamten Hydrobiologie und Hydrographie
• Main Authors: Nygaard, Gunnar, Sand‐Jensen, Kaj
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1981
• Subjects: Grane; Langsø; Nitella flexilis
• Online Access: http://dx.doi.org/10.1002/iroh.19810660506; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Firoh.19810660506; https://onlinelibrary.wiley.com/doi/pdf/10.1002/iroh.19810660506

Abstract The irradiance reaching Nitella at 11.5 m depths was almost the same during three years: 1000 cal cm −2 year −1 PAR, or 2.2% of the surface irradiance PAR. Green light (500–600 nm) constituted most (62–88%) of the irradiance on Nitella. Net photosynthesis by Nitella was linearly correlated to irradiance. Nitella had a positive oxygen balance from mid‐May to late September and a minor negative one at other times. The annual turnover of biomass was potentially high, and the dark‐respiration was very important in the metabolic balance. The contribution of Nitella to total autotrophic production and to oxygen conditions in the hypolimnion is discussed.