Nom du corpus

Corpus Systématique Animale

Titre du document

Diurnal distribution and behavioral responses of fishes to extreme hypoxia in an Amazon floodplain lake

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Springer (journals)
Langue(s) du document
Type de document
Mots-clés d'auteur
  • Várzea
  • Migration
  • Macrophytes
  • Aquatic surface respiration
  • Surface access
  • Locomotory activity
  • Ventilation rate
Nom du fichier dans la ressource
  • Ulrich Saint-Paul 1
  • Gercilia M. Soares 2
  • 1) Institut für Hydrobiologie und Fischereiwissenschaft, Olbersweg 24, D-2000, Hamburg 50, Federal Republic of Germany
  • 2) Instituto Nacional de Pesquisas da Amazônia (INPA), Caixa postal 478, 69 000, Manaus/Am, Brazil

Synopsis: Because of the need for surface access for aquatic surface respiration (ASR), fish density increases were demonstrated for the open water of a floodplain lake during severe hypoxia. This indicates an O2-induced diurnal pattern of horizontal migrations between the zone of macrophyte cover and open water. Supplemental experimental investigations seem to suggest that species such as characoids,Colossoma macropomum andSchizodon fasciatum, deviate from this pattern. During long periods of oxygen depletion, they return to the region of macrophyte growth and survive there without displaying the usual kind of ASR. Mortality studies in net cages exposed in natural water bodies confirmed that only these two species are able to survive severe hypoxia beneath macrophyte cover. The possibility of an O2-input through the root system of plants is discussed. The O2-concentration has a significant influence on the locomotory behavior and the frequency of opercular movement in characoids. There is significantly less locomotory activity beneath the macrophytes during periods of oxygen depletion among those species not forced to migrate than among those in the open water regions, where normal ASR behavior is possible.

Catégories Science-Metrix
  • 1 - applied sciences
  • 2 - agriculture, fisheries & forestry
  • 3 - fisheries
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
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
  • 1 - science ; 2 - ecology
Identifiant ISTEX

Environmental Biology of Fishes

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