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Diurnal routine O2 consumption at different O2 concentrations by Colossoma macropomum and Colossoma brachypomum (Teleostei: Serrasalmidae)
Saint-Paul, U. (1988). Diurnal routine O2 consumption at different O2 concentrations by Colossoma macropomum and Colossoma brachypomum (Teleostei: Serrasalmidae). Comp. Biochem. Physiol., Part A Physiol. 89(4): 675-682
In: Comparative Biochemistry and Physiology. Part A. Physiology. Pergamon: Oxford. ISSN 0300-9629; e-ISSN 1531-4332
Peer reviewed article  
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Trefwoorden
    Availability
    Chemical elements > Nonmetals > Atmospheric gases > Oxygen > Dissolved gases > Dissolved oxygen
    Environmental effects
    Oxygen consumption
    Temporal variations
    Temporal variations > Periodic variations > Diurnal variations
    Colossoma brachypomum; Colossoma macropomum
    Marien/Kust; Zoet water
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  • Saint-Paul, U.
Abstract
    Colossoma macropomum and C. brachypomum were found to reveal a bimodal diurnal pattern of VO2multiplied by which persisted at all levels of O2 concentration. VuO2 multiplied by increased around dawn and dusk. This seemed to be a response to the light on/off stimuli rather than being endogenous. When there is a diurnal rhythm with a morning minimum in the O2) concentration, the maximum Vu multiplied by sub(O2) of C. macropomum occurred at dawn, while that of C. brachypomum occurred at dusk. V super( )multiplied by sub(O2) of pond fish was by the factor 0.6-0.8 lower than in fish from natural water bodies. The experimental results suggest that these two species, which have somewhat similar diets, occupy separate temporal niches in the nutrient-rich habitats of the Amazon floodplains.
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