AB 2:131-141 (2008)  -  DOI: https://doi.org/10.3354/ab00042

Copepod feeding stimulates bacterioplankton activities in a low phosphorus system

Josefin Titelman1,*,**, Lasse Riemann2,**, Karin Holmfeldt2, Trygve Nilsen3

1Department of Marine Ecology, University of Göteborg, Kristineberg 566, 450 34 Fiskebäckskil, Sweden
2Department of Natural Sciences, Kalmar University, 391 82 Kalmar, Sweden
3Department of Mathematics, University of Bergen, PO Box 7800, 5020 Bergen, Norway
**J.T. and L.R. contributed equally to this article

ABSTRACT: Zooplankton sloppy feeding releases high-quality dissolved organic matter, which is readily used by microbes. We hypothesized that in phosphorus (P) limited environments, released dissolved DNA may be a particularly important source of P for bacteria. In an incubation experiment with water from the Bothnian Bay, Sweden, we investigated the short-term effect of copepod feeding activity on bacterial production, DNA uptake and phosphatase activity. Consistent patterns in bacterial activity measures suggested that copepod feeding activity stimulated phosphatase activity, DNA uptake and production. The P taken up as dissolved DNA exceeded cellular P requirements. We speculate that bacterioplankton cells in the Bothnian Bay store excess P intracellularly during times of extensive sloppy feeding, which may then subsequently be utilized to prevent P limitation of growth.

KEY WORDS: Bacteria · Copepod · DNA uptake · Phosphorus · Alkaline phosphatase · Dissolved DNA · Bothnian Bay

Full text in pdf format  
Cite this article as: Titelman J, Riemann L, Holmfeldt K, Nilsen T (2008) Copepod feeding stimulates bacterioplankton activities in a low phosphorus system. Aquat Biol 2:131-141. https://doi.org/10.3354/ab00042

Export citation
Mail this link - Contents Mailing Lists - RSS
- -