Aquatic Sciences Meeting, Albuquerque 2001

CS40 Nutrients, Primary Production, and Aquatic Ecosystems

Date: Wednesday, February 14, 2001, Time: 3:45:00 PM

Location: La Cienega

Lyche-Solheim, A, , Norwegian Institute for Water Research, Oslo, Norway, anne.lyche@niva.no

Brettum, P, , Norwegian Institute for Water Research, Oslo, Norway, paal.brettum@niva.no

EFFECTS OF NUTRIENT ADDITIONS ON THE FATE OF PRIMARY PRODUCTION IN TWO ARCTIC LAKES, NORWAY

To estimate the transfer of added nutrients to higher trophic levels in Arctic lakes, primary production, zooplankton grazing and sedimentation were measured in two ultraoligotrophic arctic lakes receiving nutrient additions and in one reference lake. Nutrient additions (from 3 to 10 µg total-P L-1) increased primary production with an order of magnitude. The proportion of primary production grazed by mesozooplankton increased, whereas the proportion lost to the sediments decreased in both the fertilized lakes, indicating an increased efficiency of nutrient transfer to higher trophic levels.

This Session Listing

Aquatic Sciences Meeting, Albuquerque 2001

Quicklinks