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JPR Advance Access published online on April 25, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm036
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Seasonal dynamics and depth distribution of Planktothrix spp. in Lake Steinsfjorden (Norway) related to environmental factors

Camilla Blikstad Halstvedt1, Thomas Rohrlack1, Tom Andersen1,2, Olav Skulberg1 and Bente Edvardsen1,2,

1 Norwegian Institute for Water Research, Gaustadallèen 21, N-0349 Oslo, Norway 2 University of Oslo, Department of Biology, P.O. Box 1066 Blindern, N-0316 Oslo, Norway

Correspondence to: Camilla Blikstad Halstvedt, Norwegian Institute for Water Research, Gaustadallèen 21, N-0349 Oslo, Tel.: +47 22185100, Fax.: +47 22185200, e-mail: camilla.halstvedt{at}niva.no

Received on November 16, 2006; revised on March 1, 2007; accepted on April 24, 2007


  Abstract

To investigate factors and mechanisms regulating toxin producing populations of Planktothrix, we conducted a field study (2001-2004) in the mesotrophic Lake Steinsfjorden, South-eastern Norway. The occurring species, Planktothrix rubescens and P. agardhii, had similar depth distributions and seasonal dynamics, both forming metalimnetic blooms in 10-14 m depth. By comparing the resource availability and temperature in Lake Steinsfjorden with demands determined in laboratory studies, temperature and light were identified as the most important factors controlling growth and depth distribution of Planktothrix spp. In addition macronutrients, especially nitrogen, may have limited growth in periods. A lowering of nutrient supplies over time could in addition to the prevailing suboptimal temperature and light conditions prevent the population of Planktothrixspp. from forming blooms. On two occasions, a major decrease in Planktothrix spp. abundance in the open water could be linked to a transport towards the banks of Lake Steinsfjorden with subsequent decomposition in the littoral zone. Our results show that the depth distribution and seasonal dynamics of Planktothrix spp. in Lake Steinsfjorden is controlled by environmental factors in a similar way as in other Nordic, Central European and North American lakes.

Key Words: Cyanobacteria • Planktothrix • environmental factors • population dynamics

Communicating Editor: K.J. Flynn


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