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Differential sensitivity to natural ultraviolet radiation among phytoplankton species in Arctic lakes (Spitsbergen, Norway)

Van Donk, E. and Faafeng, B.A. and De Lange, H.J. and Hessen, D.O. (2001) Differential sensitivity to natural ultraviolet radiation among phytoplankton species in Arctic lakes (Spitsbergen, Norway). Plant Ecology, 154, 247-259. ISSN 1385-0237.

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Official URL: http://dx.doi.org/10.1023/A:1012978328768

Abstract

Incubation experiments demonstrated a differential sensitivity to natural UV-radiation among the dominant phytoplankton species from three Arctic lakes, situated near Ny-Angstrom lesund, Spitsbergen (79 degrees N). The growth of small chlorophytes, diatoms and picocyanobacteria from two oligotrophic lakes was inhibited primarily by the shorter wavelength UV components, while the growth of the larger colony-forming species (cyanobacteria, Planktothrix sp., Woronichinia sp. and the chrysophyte, Uroglena americana Calkins) apparently was stimulated. These colonies (not easily eaten by daphnids) dominated at the end of the experiment in those treatments where the short wavelength UV components were not excluded. For the two oligotrophic localities, 70 and 61%, respectively, of total phytoplankton biovolume were edible in the treatments excluding short wavelength UV, compared to only 13 and 19%, respectively, in the treatments including such radiation. For the third, more productive and less transparent lake, the percentage of edible species in the treatments with and without short wavelength UV radiation did not differ (ca. 75% for both treatments). [KEYWORDS: cell size; cyanobacteria; daphnids; foodweb; grazers; inedible algae; Svalbard; UV-B Uv-b radiation; ozone depletion; chlamydomonas-reinhardtii; community responses; solar uvb; inhibition; growth; assemblages; algae; zooplankton]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10968
Deposited On:25 Aug 2011 02:00
Last Modified:31 Mar 2014 11:08

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