Marine Ecology Progress Series 518:107
Vol. 518: 107–121, 2015 MARINE ECOLOGY PROGRESS SERIES Published January 7 doi: 10.3354/meps11087 Mar Ecol Prog Ser FREEREE ACCESSCCESS Eelgrass Zostera marina in subarctic Greenland: dense meadows with slow biomass turnover in cold waters Birgit Olesen1,*, Dorte Krause-Jensen2,3, Núria Marbà4, Peter Bondo Christensen2,3 1Department of Bioscience, Aarhus University, Ole Worms Allé 1, Building 1135, 8000 Aarhus C, Denmark 2Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark 3Arctic Research Centre, Aarhus University, C.F. Møllers Allé 8, 8000 Aarhus C, Denmark 4Department of Global Change Research, IMEDEA (CSIC-UIB), Institut Mediterrani d’Estudis Avancats, Miquel Marques 21, 07190 Esporles (Illes Balears), Spain ABSTRACT: Eelgrass Zostera marina L. is the most dominant seagrass species throughout the temperate northern hemisphere, and knowledge on its distribution and production in relation to climatic conditions is relevant for predicting the future of the meadows. We synthesized past and present information on eelgrass near the northern distribution limit in Greenland, and quantified the biomass, production and reproductive potential of eelgrass populations in 4 widely separated locations of Godthåbsfjorden at 64° N. Eelgrass observations in Greenland date back to 1813; most of the meadows recorded in the past still exist, and new ones were identified. The meadows are relatively small and geographically isolated, typically occurring in inner branches of the fjord sys- tem where summer water temperatures are higher (13 to 15°C) than in the outer part (<10°C). The shoot density (871 to 2045 shoots m−2), aboveground biomass (90 to 327 g dry wt [DW] m−2) and rhizome extension rates (8 to 29 cm yr−1) match levels further south.
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