Changes in the diet of charr Salvelinus alpinus L. after introduction of Mysis relicta Loven in two subalpine reservoirs in Norway
Main Article Content
Abstract
The mysid crustacean Mysis relicta was introduced into two Central Norwegian subalpine reservoirs, Stugusjøen and Gjevilvatn in 1973. Maximum density of Mysis was reached 9 to 10 years after the transplanting; densities later diminished to a low level. The introduction of Mysis in Stugusjøen has resulted in a large decline in the Cladocera population. From 1978 to 1985, charr diet in the two lakes has usually comprised 20% to 60% Mysis during spring and autumn in the two lakes. The amphipod Pallasea quadrispinosa was an important part of charr diet in Stugusjøen during spring. There has been a decrease in catch per effort and in mean weight for charr in both lakes during the study period.
Downloads
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).