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Aquatic Microbial Ecology

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AME 48:295-308 (2007)  -  doi:10.3354/ame048295

Biovolume and biomass estimates of key diatoms in the Southern Ocean

Véronique Cornet-Barthaux*, Leanne Armand, Bernard Quéguiner

Aix-Marseille Université, CNRS, LOB-UMR 6535, Laboratoire d’Océanographie et de Biogéochimie, OSU/Centre d’Océanologie de Marseille, 13288 Marseille, France

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.

KEY WORDS: Diatoms · Size measurements · Cell biovolume · Carbon biomass · Kerguelen Plateau

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Cite this article as: Cornet-Barthaux V, Armand L, Quéguiner B (2007) Biovolume and biomass estimates of key diatoms in the Southern Ocean. Aquat Microb Ecol 48:295-308.

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