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Seasonal heterotrophic flagellate and bacterial plankton dynamics in a large oligotrophic lake - Loch Ness, Scotland

Citation

Laybourn-Parry, J and Walton, M, Seasonal heterotrophic flagellate and bacterial plankton dynamics in a large oligotrophic lake - Loch Ness, Scotland, Freshwater Biology, 39, (1) pp. 1-8. ISSN 0046-5070 (1998) [Refereed Article]

DOI: doi:10.1046/j.1365-2427.1998.00253.x

Abstract

1. Bacterial production in the 0-30 m water column of Loch Ness was measured using a dual labelling procedure with [3H] thymidine and [14C] leucine between May 1993 and June 1994. In most cases the uptake of the two labels did not covary, suggesting unbalanced growth. Rates of bacterial production varied from undetectable to 46.2 μg C l-1 day-1. Highest production coincided with the period of highest primary production, but carbon derived from this source was insufficient to meet the bacterial carbon demand, which was met by allochthonous humic inputs to the system. 2. Heterotrophic flagellate (HNAN) grazing rates, measured using fluorescently labelled bacteria, ranged between 10.3 and 24.5 bacteria cell-1 day-1 at temperatures between 5 and 15 °C. They removed up to 27% of the bacterial production per day. 3. Heterotrophic flagellate specific growth rates ranged from 0.043 to 0.093 h-1 between 5 and 15 °C, giving generation times of 7.4-16.1 h. 4. bacterial and HNAN abundances were not coupled, but the highest HNAN grazing impact related to a time of high bacterial productivity.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Laybourn-Parry, J (Professor Johanna Laybourn-Parry)
ID Code:49078
Year Published:1998
Web of Science® Times Cited:19
Deposited By:Research Division
Deposited On:2007-11-13
Last Modified:2011-08-10
Downloads:0

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