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Vertical movements by planktonic cyanobacteria and the translocation of phosphorus: implications for lake restoration.

Head, R. M. and Jones, Roger I. and Bailey-Watts, A. E. (1999) Vertical movements by planktonic cyanobacteria and the translocation of phosphorus: implications for lake restoration. Aquatic Conservation: Marine and Freshwater Ecosystems, 9 (1). pp. 111-120. ISSN 1052-7613

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Abstract

1. Vertical movements of cyanobacteria during summer stratification were studied in Cauldshiels Loch, a small dimictic temperate lake. 2. Filaments of the three species of cyanobacteria dominant in the summer phytoplankton were recorded moving vertically in both directions, by simple traps deployed just below the thermocline. 3. These phytoplankters could potentially exploit opposing ends of the vertical light/nutrient gradient that existed in the water column during stratification. 4. The hypolimnion and water overlying the sediments were enriched by phosphorus released from the sediments. This internal loading to the lake provides a source of phosphorus available to migrating cyanobacteria to sustain production and growth in the epilimnion. 5. In this study, cyanobacteria filaments moving from the hypolimnion were found to be translocating phosphorus to the epilimnion. 6. Following reduction of external phosphorus loading, utilization of such internal phosphorus sources may delay expected reductions of bloom-forming cyanobacterial communities, and consequent improvements in other aspects of water quality.

Item Type: Article
Journal or Publication Title: Aquatic Conservation: Marine and Freshwater Ecosystems
Uncontrolled Keywords: plankton ; cyanobacteria ; phosphorus loading ; nutrient enrichment ; lake restoration
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > School of Computing & Communications
ID Code: 10942
Deposited By: Mr Richard Ingham
Deposited On: 28 Jul 2008 13:27
Refereed?: Yes
Published?: Published
Last Modified: 18 Sep 2013 16:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10942

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