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Microzooplankton biomass distribution in Terra Nova Bay, Ross Sea (Antarctica)
Umani, S.F.; Monti, M.; Nuccio, C. (1998). Microzooplankton biomass distribution in Terra Nova Bay, Ross Sea (Antarctica), in: Le Fèvre, J. et al. (Ed.) Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4): pp. 289-303. hdl.handle.net/10.1016/S0924-7963(98)00044-X
In: Le Fèvre, J.; Tréguer, P. (Ed.) (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4). Elsevier: Amsterdam. 1-619 pp., more
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963, more
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Keywords
    Biomass; Community composition; Dominant species; Ecological zonation; Heterotrophic organisms; Nannoplankton; Spatial variations; Vertical distribution; Zooplankton; Antarctica, Victoria Land, Terra Nova [Marine Regions]; Marine

Authors  Top 
  • Umani, S.F.
  • Monti, M.
  • Nuccio, C.

Abstract
    This work describes the spatial and vertical distribution of microzooplankton (20–200 µm) abundance and biomass of the upper layers (0–100 m), collected during the first oceanographic Italian expedition in Antarctica (1987/1988) in Terra Nova Bay (Ross Sea). Biomass was estimated by using biovolume calculations and literature conversion factors. Sampling was carried out at three depths, surface, 50 and 100 m. The dominant taxa were made up of tintinnid ciliates, ciliates other than tintinnids, larvae of micrometazoa and heterotrophic dinoflagellates. The abundance of the total microplankton fraction had its absolute maximum in the center of Terra Nova Bay at the surface with 31?042 ind. dm-3. The areal and vertical distribution of heterotrophic microplankton biomass differs from that of abundance. On the basis of hydrological conditions, phytoplankton composition and biomass and microzooplankton biomass and structure it is possible to identify three groups of stations: 1—northern coastal stations (intermediate chlorophyll maxima, microphytoplankton prevalence, low microzooplankton biomass); 2—central stations (high surface chlorophyll, nanoplankton prevalence, high abundance of microzooplankton); 3—northern stations (deeper pycnocline, nanoplankton prevalence, high microzooplankton biomass at intermediate depths).

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