Measurements of primary production in Kattegat and in adjacent waters of the Baltic entrance region: a brief historical review.

Lars Rydberg.
Department of Oceanography
University of Gothenburg
Tel. +46 31 7732856
lary@oce.gu.se

Measurements of primary production in Kattegat and in adjacent waters of the Baltic entrance region are presented. The presentation includes a brief review of long-term trends, but also of spatial and seasonal variability. Data are discussed in the light of changing and variable nutrient supply. Other mechanisms affecting primary production, such as mixed layer depth, changing ecology and hydrography are also considered. An interpretation of concepts such as net or regenerated production, in relation to the measured primary production, is given.