Nom du corpus

Corpus Systématique Animale

Titre du document

Changes in the fish and zooplankton communities of Ringsjön, a Swedish lake undergoing man-made eutrophication

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • plankton feeders
  • grazing
  • eutrophication
  • trophic structure
  • zooplankton
  • freshwater fish
Nom du fichier dans la ressource
Poissons_v2b_003692
Auteur(s)
  • Eva Bergstrand
Affiliation(s)
  • Institute of Freshwater Research, S-170 11, Drottningholm, Sweden
Résumé

During the 20th century Lake Ringsjön has developed from a mesotrophic to a eutrophic lake, and the phytoplankton community has changed from a rather diverse community to a monoculture of blue-green algae. The eutrophication process has accelerated during the last decade. The most important external nutrient loading of today comes from agriculture. Although phosphorus has been shown to be the primary nutrient leading to excessive algal growth in fresh water, several biotic factors — such as interactions between nutrients, phytoplankton, zooplankton and planktivorous fish — may play a decisive role in the occurrence and maintenance of large algal blooms. The aim of this investigation was to study the changes in the fish community of Lake Ringsjön, especially the most dominant planktivores, and the state of the zooplankton community during the seventies. The fish fauna is dominated by cyprinids, especially roach, and there are relatively few predatory fish. During the seventies the mean size of roach decreased, and measurements of the zooplankton community indicated that the predation pressure on zooplankton had increased. The mean sizes of cladocerans such as Daphnia and Bosmina, which were selected for by the planktivorous fish, decreased; the size of the calanoid Diaptomus, which was not preyed upon by the dominating fish species, did not change. The growth of zooplankton-feeding stages of several fish species was retarded, which meant that the growth of young perch decreased, while older roach were mainly affected. In the prevailing situation, planktivorous roach can maintain a numerous population of small individuals, whereas the predatory perch is at a disadvantage, and predation on zooplankton is intense.

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
A341CDB123C9E2C84C39E96F7A0F4EF39EDAA777
Revue

Hydrobiologia

Année de publication
1990
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
8.727
Sous-corpus
  • Poissons
Type de publication
Journal
ark:/67375/1BB-58GP4RN3-P
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