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JPR Advance Access published online on August 2, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi047
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received March 18, 2005
Accepted July 8, 2005

Article

Photosynthetic algal production, accumulation and release of phytoplankton storage carbohydrates, and bacterial production in a gradient in daily nutrient supply

Knut Yngve Børsheim 1*, Olav Vadstein 2, Sverre M. Myklestad 2, Helge Reinertsen 3, Ståle Kirkvold 2, and Yngvar Olsen 3

1 Department of Biotechnology, Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway; Current address: Department of Biology, The University of Bergen, Jahnebakken 5, NO- 5020 Bergen, Norway
2 Department of Biotechnology, Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway
3 Department of Biology, Norwegian University of Science and Technology, NTNU, NO-7491 Trondheim, Norway

* To whom correspondence should be addressed.
Knut Yngve Børsheim, E-mail: knut.borsheim{at}bio.uib.no


  Abstract

In a mesocosm experiment providing a gradient of semi-continuous addition of mineral nutrient, production rates and mortality of phytoplankton were estimated. Heterotrophic bacterial biomass and production rates, and their responses to the mineral nutrients additions were also estimated. The purpose of the experiment was to establish responses of the major biological factors as a function of nutrient amendments. Initial primary production was approximately 0.47 µg C L-1d-1. In the most fertilised mesocosm, phytoplankton biomass increased at a specific rate of 0.4 d-1 during the first week of the experiment, and on day 9 primary production reached a peak at 1027 µg C L-1d-1. The responses in the other fertilised mesocosms were intermediate, and in an unfertilised control the variables measured stayed almost constant throughout the experiment. The termination of the blooms in the fertilised mesocosms was a consequence of nitrogen limitation, and nitrogen limitation subsequently induced storage of intracellular organic material in the phytoplankton. In the mesocosm receiving the highest daily dose of nutrients, strong post-bloom nutrient limitation resulted in high phytoplankton mortality, and release of organic material from the algae supported the gradient’s highest heterotrophic bacterial production.

Keywords: Primary production, bacterial production, cellular carbohydrate, DOC, mesocosm.
Communicating Editor: KJ Flynn
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