Relationships between bacterioplankton, chl a and temperature in Antarctic surface waters in summer |
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Authors: | Anne Heinänen Mika Raateoja Eila Lahdes Juha-Markku Leppänen |
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Institution: | (1) Finnish Institute of Marine Research, P.O. Box 33, FIN-00931 Helsinki, Finland fax: +358 9 61394 494; e-mail: anne.heinanen@aka.fi, FI |
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Abstract: | Spatial variations of bacterio- and phytoplankton were studied in order to compare their relationship in open-sea and coastal
areas. Sampling was done quasi-synoptically south of the Antarctic Convergence in the Lazarev Sea and in the eastern part
of the Weddell Sea during austral mid-summer. Thymidine incorporation rate was on average 1.10 nmol/m3 per hour in the open sea and 4.04 nmol/m3 per hour in the coastal area, bacterial abundance was 4.44 × 1011 and 6.11 × 1011 cells/m3 and chlorophyll a (chl a) was 0.43 and 2.42 mg/m3, respectively. Thymidine incorporation rate and chl a correlated positively in both the open-sea and coastal samples. In the coastal area bacterial numbers also correlated positively
with chl a. The scale of spatial resolution was not important for detecting empirical relationships between phytoplankton and bacterioplankton
parameters. In the coastal area, the low bacterial biomass in relation to chl a concentration compared to other oceans, indicates that generalised relationships between these parameters are not valid in
Antarctic coastal waters. Grazing could not explain the discrepancy. The results suggest a strong coupling between phytoplankton
and bacterioplankton. In addition, the results suggest that the bacterial assemblage in the coastal area was psychrophilic
and well adapted to the prevailing low temperatures.
Received: 18 October 1996 / Accepted: 8 December 1996 |
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