Nom du corpus

Corpus Systématique Animale

Titre du document

Changes in mercury levels in lake whitefish ( Coregonus clupeaformis ) and northern pike ( Esox lucius ) in the LG-2 reservoir since flooding

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Poissons_v2b_003898
Auteur(s)
  • K. A. Morrison 1
  • N. Thérien 1
Affiliation(s)
  • 1) Faculty of Applied Sciences, University of Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada
Résumé

After flooding of the LG-2 reservoir in 1978–1979, it was noticed that Hg levels in fish rose dramatically. In this study the Hg data have been examined on the basis of fish age for lake whitefish (Coregonus clupeaformis) and northern pike (Esox lucius), representing two different trophic levels. Data were fit to Von Bertalanffy functions using non-linear regression analyses. Reductions in error sums of squares indicated that differences among years were the major sources of variation, but that there were differences among stations within years. For age profiles both species showed changes after flooding, whitefish increasing immediately and remaining similar until 8 years after flooding, with decreases afterward, while pike continued to increase until 8 years after flooding, remaining somewhat stable afterwards. For whitefish, cohorts (year classes) from before flooding had similar concentrations, with maxima reached by around 1982, concentrations afterward remaining stable. Subsequent cohorts reached plateaus at around 2–4 years of age, each successive cohort having a lower plateau. For pike, Hg kept increasing in an almost linear fashion, cohorts from before flooding having similar concentrations. Analyses indicated the very gradual return of whitefish to conditions present before flooding, while pike were remaining at much higher levels. Inputs to older pike were therefore not decreasing, but younger pike may have been improving.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - earth & environmental sciences
  • 3 - environmental sciences
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Pollution
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Water Science and Technology
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecological Modelling
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Environmental Chemistry
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Environmental Engineering
Catégories WoS
  • 1 - science ; 2 - water resources
  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
Identifiant ISTEX
65D4CD6F1F34C5BF7FD770343B275381E3557AF3
Revue

Water, Air, and Soil Pollution

Année de publication
1995
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
7.61
Sous-corpus
  • Poissons
Type de publication
Journal
ark:/67375/1BB-GDZRV3CX-2
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