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  • anoxia  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The behavioural responses and tolerance of freshwater benthic cyclopoid copepods to hypoxia and anoxia (1985)
    Springer
    Hydrobiologia 127 (1985), S. 257-263 
    Details
    ISSN: 1573-5117
    Keywords: anoxia ; behaviour ; copepod ; hypoxia ; migration ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of four benthic cyclopoid copepods, Acanthocyclops viridis (Megacyclops viridis) (Jurine, 1820), Macrocyclops albidus (Jurine), Eucyclops agilis (Koch, Sars) (Eucyclops serrulatus) (Fischer, 1851) and Paracyclops fimbriatus (Fischer), to hypoxia and anoxia was investigated. All of these species died within six hours when confronted by totally anoxic conditions, but all survived four days at oxygen saturation levels as low as 25%. Males succumbed to the effects of anoxia more rapidly than the larger females of each species, and larger species survived for shorter periods than smaller species. In artificially stratified columns, where the lower layer was anoxic, all four species displayed an upward migratory response towards oxygenated conditions. Where the artificial hypolimnion was hypoxic, however, the migratory response was not observed. The results suggest that some benthic copepods cope with seasonal anoxia in eutrophic stratified lakes by migration rather than the various physiological adaptations shown by planktonic and semi-planktonic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The behavioural responses and tolerance of freshwater benthic cyclopoid copepods to hypoxia and anoxia (1985)
    Springer
    Hydrobiologia 127 (1985), S. 257-263 
    Details
    ISSN: 1573-5117
    Keywords: anoxia ; behaviour ; copepod ; hypoxia ; migration ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of four benthic cyclopoid copepods,Acanthocyclops viridis (Megacyclops viridis) (Jurine, 1820),Macrocyclops albidus (Jurine),Eucyclops agilis (Koch, Sars) (Eucyclops serrulatus) (Fischer, 1851) andParacyclops fimbriatus (Fischer), to hypoxia and anoxia was investigated. All of these species died within six hours when confronted by totally anoxic conditions, but all survived four days at oxygen saturation levels as low as 25%. Males succumbed to the effects of anoxia more rapidly than the larger females of each species, and larger species survived for shorter periods than smaller species. In artificially stratified columns, where the lower layer was anoxic, all four species displayed an upward migratory response towards oxygenated conditions. Where the artificial hypolimnion was hypoxic, however, the migratory response was not observed. The results suggest that some benthic copepods cope with seasonal anoxia in eutrophic stratified lakes by migration rather than the various physiological adaptations shown by planktonic and semi-planktonic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024230
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The distribution and abundance of benthic cyclopoid copepods in Esthwaite Water, Cumbria (1986)
    Springer
    Hydrobiologia 131 (1986), S. 225-234 
    Details
    ISSN: 1573-5117
    Keywords: anoxia ; benthos ; copepod ; diapause ; migration ; stratification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial and temporal distribution of the benthic cyclopoid copepods, Acanthocyclops viridis, Acanthocyclops bicuspidatus, Eucyclops agilis, Paracyclops fimbriatus and Macrocyclops albidus in a small eutrophic lake Esthwaite Water, Cumbria was investigated in 1982 and 1983. The behavioural and physiological mechanisms by which these organisms cope with the conditions of hypoxia and anoxia prevalent during seasonal stratification of the lake waters was considered. During stratification all of these species, with the exception of resting stage A. bicuspidatus, disappeared from the profundal zone and were limited to the shallower margins of the lake. None of these copepod species entered the plankton and established planktonic populations, none appeared capable of sustained anaerobic respiration, although all can withstand some degree of hypoxia, and only A. bicuspidatus appeared capable of entering resting stages. The data suggest that in eutrophic lakes species normally found in the profundus deal with anoxia by lateral migration to shallow waters where oxygen is available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008858
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    Paper (German National Licenses)
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