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Grazing and UV radiation effects on an Antarctic intertidal microalgal assemblage: a long-term field study
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2007 (English)In: Polar Biology, ISSN 0722-4060, E-ISSN 1432-2056, Vol. 30, no 9, 1203-1212 p.Article in journal (Refereed) Published
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Text
Abstract [en]

A 15 week field experiment (austral summer Nov-Mar) was carried out in an intertidal hard bottom platform in Antarctica (King George Island). To test whether grazing and ultraviolet radiation (UVR) influenced the succession of a benthic microalgal assemblage, a two-factorial design was used (1) ambient radiation, > 280 nm; (2) ambient minus UV-B, > 320 nm; (3) ambient minus UVR, > 400 nm versus grazer-no grazer). On four sampling occasions microalgae were identified, counted and carbon contents were calculated. The assemblage was dominated by the diatom genera Navicula and Cocconeis. Biomass was generally low in all treatments but was significantly reduced by grazing throughout the experiment. No significant UV effects were found. Grazer absence particularly favoured diatoms of the genus Cocconeis. We conclude that the Antarctic microalgal assemblage was unaffected by present day UVR whereas grazers acted as important drivers on the intertidal microalgal community structure.

Place, publisher, year, edition, pages
Alfred Wegener Inst Polar & Marine Res, D-27570 Bremerhaven, Germany. Univ Hamburg, Biozentrum Klein Flottbek, D-22609 Hamburg, Germany. Univ Gothenburg, Dept Marine Ecol, S-40530 Gothenburg, Sweden., 2007. Vol. 30, no 9, 1203-1212 p.
Keyword [en]
benthic diatoms, diversity, grazing, hard bottom community, microalgae, UV radiation
Research subject
SWEDARP; SWEDARP 2003/04, King George Island
Identifiers
URN: urn:nbn:se:polar:diva-2567DOI: 10.1007/s00300-007-0278-yISI: 000247971800010OAI: oai:DiVA.org:polar-2567DiVA: diva2:883200
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2015-12-16

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