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Abstract

Linear measurements of 31 Southern Ocean diatom species or genus groupings are presented
and used in the derivation of species-specific biovolume, biomass and surface to volume
ratios. Species measurements are in tune with summarised values in the literature and range from 2.6
to 2296 μm in length and 8.5 to 140 μm in diameter. Average cell volume ranged from 63 to 1.43 ×
105 μm3 and biomass from 10 to 3686 pg C cell–1, the values being smallest in pennate shaped species
and greatest in cylindrical centrics. The 31 species can be divided into 7 small, 12 intermediate and
12 large biomass contributors based on their cell volume and/or their surface to volume ratio. Carbon
biomass estimates from biovolume equations are discussed and suggest that future work including
large Southern Ocean species is warranted. Species-specific biomass values reported here should
serve as a baseline for future analyses of major diatom carbon contributors in the generally high
nutrient, low chlorophyll Southern Ocean.

Item Type:	Article
Authors/Creators:	Cornet-Barthaux, V and Armand, LK and Quéguiner, B
Keywords:	Diatoms · Size measurements · Cell biovolume · Carbon biomass · Kerguelen Plateau
Journal or Publication Title:	Aquatic Microbial Ecology
Publisher:	Inter-Research
ISSN:	0948-3055
DOI / ID Number:	10.3354/ame048295
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