Nom du corpus

Corpus Systématique Animale

Titre du document

Environmental effects of introducing whitefish, Coregonus lavaretus (L.), in Lake Ring

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Coregonus lavaretus
  • introduction
  • predation
  • zooplankton
  • chlorophyll- a
  • Secchi-depth
  • eutrophication
Nom du fichier dans la ressource
Poissons_v2b_002728
Auteur(s)
  • S. Berg 1
  • E. Jeppesen 2
  • M. Søndergaard 2
  • E. Mortensen 2
Affiliation(s)
  • 1) Inland Fisheries Laboratory, Lysbrogade 52, DK-8600, Silkeborg, Denmark
  • 2) Department of Freshwater Ecology, National Environmental Research Institute, Vejlsøvei 25, P.O. Box 314, DK-8600, Silkeborg, Denmark
Résumé

The impact of whitefish (Coregonus lavaretus (L.)) on the trophic structure of eutrophic lakes was studied in Lake Ring, a small eutrophic Danish lake (22.5 ha, mean depth 2.9 m) in which the natural fish fauna is dominated by pike (Esox lucius L.), perch (Perca fluviatilis L.), and eel (Anguilla anguilla (L.)), roach (Rutilus rutilus (L.)) and burbot (Lota lota (L.)) being the only other fish species present. A total of 10993 0+ whitefish were stocked in the lake from October 1989 to July 1990 and the structure of the fish, zooplankton and benthic invertebrate communities studied during the period 1989–1991. Stomach contents analysis revealed that the whitefish mainly ate Daphnia and copepods in 1990–1991, the proportion of copepods decreasing with increasing size of the fish and Daphnia being the overall most important food source. The density of Daphnia in the lake decreased from 72 ind. 1-1 in 1989 to 9 ind. 1-1 in 1991; concomitantly the large species Daphnia magna and D. pulex almost disappeared and the density of cyclopoid copepods increased from 72 to 101 ind. 1-1, presumably because of improved food conditions, while that of calanoid copepods remained virtually unchanged. As a result chl-a increased from 19 to 47 µg 1-1 and Secchi depth decreased from 2.4 m to 1.7 m, despite there being no change in total P and total N (0.6 mg P 1-1 and 1.3 mg N 1-1, respectively). Changes were also observed in the benthic invertebrates; Chaoborus, oligochaetes, and chironomids all decreased, whereas Pisidium increased. It is concluded that the stocking of whitefish in eutrophic lakes for commercial purposes may delay their recovery, or even lead to enhanced eutrophication.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
Identifiant ISTEX
ADD313D28F280E4A7C6082F0A122DED680E4363C
Revue

Hydrobiologia

Année de publication
1994
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
8.544
Sous-corpus
  • Poissons
Type de publication
Journal
ark:/67375/1BB-FX44N3JC-5
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