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Algal biomass in the East Antarctic pack ice


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Grose, Michael 2004 , 'Algal biomass in the East Antarctic pack ice', Research Master thesis, University of Tasmania.

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Sea ice algal biomass in the eastern Antarctic zone was assessed using
measurements and observations. This assessment was entered into a simple model,
using remote sensing data to estimate habitat extent, to make an estimate of total sea
ice algal biomass in the region.
The late spring (2000) algal biomass and species composition in the bottom
and surface communities in pack ice floes in East Antarctica (105-115°E) is
described. Ice cores and surface ice samples were taken, and a simple ship based
observation technique to estimate algal biomass is evaluated and assessed. Measured
values of biomass compared well with observed values. The bottom algal biomass
was between 0.66 to 28.05 mg Chl a m-2 , and highly variable across the bottom of ice
floes. Surface ice algal biomass was less than the bottom and was heavily influenced
by floe edge effects.
Remote sensing data, viewed in GIS software, was used to calculate the ice
thickness distribution and the habitat extent of each ice type across the entire study
area (30-150°E). This information was used, together with measurements of the
distribution of algal biomass within the ice column, to estimate total algal biomass.
The total sea ice algal biomass in this region was estimated to be 7.81 Tg C on 20
November 2000, 80% of which was in the bottom community. Extrapolating this
result to December based on a conservative ice algal growth rate resulted in a
maximum standing algal crop of 8.51 Tg C, 95% of which was in pack ice, and 80%
was in the pack ice bottom community. This is —14% of the Antarctic ice algal
biomass. These results suggest that bottom communities are far more important in the
East Antarctic region than they have previously been assessed to be.

Item Type: Thesis - Research Master
Authors/Creators:Grose, Michael
Keywords: Algae culture, Algal populations
Copyright Holders: The Author
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Copyright 2004 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
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Available for library use only and limited copying in accordance with the Copyright Act 1968. Thesis (M.Sc.)--University of Tasmania, 2005. Includes bibliographical references

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