Seasonal progression of diatom assemblages in surface waters of Ryder Bay, Antarctica

Annett, Amber L.; Carson, Damien S.; Crosta, Xavier; Clarke, Andrew ORCID:; Ganeshram, Raja S.. 2010 Seasonal progression of diatom assemblages in surface waters of Ryder Bay, Antarctica. Polar Biology, 33 (1). 13-29.

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Phytoplankton assemblages from seasonally sea-ice covered Ryder Bay (Adelaide Island, Antarctica) were studied over three austral summers (2004–2007), to link sea-ice variability and environmental conditions with algal speciation. Typical of near-shore Antarctic waters, biomass was dominated by large diatoms, although the prymnesiophyte Phaeocystis antarctica was numerically dominant. Although there was considerable interannual variability between main diatom species, high biomass of certain species or species groups corresponded consistently to certain phases of seasonal progression. We present the first documentation of an extensive bloom of the late-season diatom Proboscia inermis in February 2006, accounting for over 90% of diatom biomass. At this time, water column stratification and nutrient drawdown were high relative to other periods of the study, although carbon export was relatively low. Melt water flux in this region promotes well-stratified surface waters and high chlorophyll levels, but not necessarily concurrent increases in export production relative to seasons with lower freshwater inputs.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Other
ISSN: 0722-4060
NORA Subject Terms: Marine Sciences
Biology and Microbiology
Ecology and Environment
Date made live: 17 Aug 2010 13:34 +0 (UTC)

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