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Microplankton dynamics in a perennially ice-covered Antarctic Lake - Lake Hoare
Citation
Roberts, EC and Priscu, JC and Laybourn-Parry, J, Microplankton dynamics in a perennially ice-covered Antarctic Lake - Lake Hoare, Freshwater Biology, 49, (7) pp. 853-869. ISSN 0046-5070 (2004) [Refereed Article]
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Copyright Statement
The definitive published version is available online at: http://interscience.wiley.com
Official URL: http://interscience.wiley.com
DOI: doi:10.1111/j.1365-2427.2004.01230.x
Abstract
1. Temporal and spatial variation in planktonic abundance, biomass and composition were
determined in Lake Hoare (McMurdo Dry Valleys, Antarctica) over two summer seasons
(199697 and 199798).
2. Phototrophic nanoflagellates (PNAN) dominated planktonic biomass, with a mean
monthly biomass ranging between 27.3 and 40.4 lg C L)1. The deep chlorophyll maximum
was mainly composed of cryptophytes (>87% of total PNAN biomass) and varied in depth
between 6 and 12 m.
3. Maximum bacterial concentration was 11.8 · 105 cells mL)1. Bacterial abundance
showed relatively little temporal variation, with the exception of a drop in numbers that
occurred in late November of both years studied.
4. Ciliates were the most successful heterotrophic protozoan group, with a mean monthly
biomass (1.23.2 lg C L)1) being typically at least double that of heterotrophic nanoflagellate
(HNAN) biomass (0.10.7 lg C L)1).
5. Microbial processes within this lake appear to be dominated by bottom up control. The
relative importance of allochthonous inputs into the lake (from the ice-cover and stream
flow) and autochthonous recycling (by microzooplankton regeneration) are considered.
6. Results from a horizontal transect indicate that the permanence of the main sample hole
may have enhanced planktonic biomass over a relatively small spatial scale.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Biological Sciences |
Research Group: | Microbiology |
Research Field: | Microbial ecology |
Objective Division: | Environmental Management |
Objective Group: | Management of Antarctic and Southern Ocean environments |
Objective Field: | Biodiversity in Antarctic and Southern Ocean environments |
UTAS Author: | Laybourn-Parry, J (Professor Johanna Laybourn-Parry) |
ID Code: | 49065 |
Year Published: | 2004 |
Web of Science® Times Cited: | 19 |
Deposited By: | Research Division |
Deposited On: | 2007-11-12 |
Last Modified: | 2009-06-09 |
Downloads: | 2 View Download Statistics |
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