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  • Astronotus ocellatus  (1)
  • Spatial distribution of light  (1)
  • 1990-1994  (1)
  • 1985-1989  (1)
Document type
Keywords
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Years
  • 1990-1994  (1)
  • 1985-1989  (1)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Auditory sensitivity of the cichlid fish Astronotus ocellatus (Cuvier) (1992)
    Springer
    Journal of comparative physiology 171 (1992), S. 105-109 
    Details
    ISSN: 1432-1351
    Keywords: Astronotus ocellatus ; Audiogram ; Acoustic ; sensitivity ; Fish ear ; Non-otophysan fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Auditory sensitivity was determined for the oscar, Astronotus ocellatus, a cichlid fish that has no known structural specializations to enhance hearing. Trained A. ocellatus behaviorally responded to sound stimuli from 200 Hz to 800 Hz with best sensitivity of 18 dB (re: 1 μbar) to 21 dB for frequencies between 200 and 400 Hz. This is significantly poorer than hearing sensitivity for fish classified as hearing specialists, but well within the range of hearing capabilities reported for non-specialist teleost species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195965
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial heterogeneity of photosynthetic photon flux density in the canopy ofMiscanthus sinensis (1989)
    Springer
    Ecological research 4 (1989), S. 339-349 
    Details
    ISSN: 1440-1703
    Keywords: Grass canopy ; Microsite ; Miscanthus sinensis ; Photosynthetic photon flux density ; Spatial distribution of light
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spatial variation in photosynthetic photon flux density (PPFD) was investigated in detail at different heights within the canopy of aMiscanthus sinensis grassland to evaluate the light environment of microsites for establishment of heliophilic tree seedlings. Highly heterogeneous patterns of light distribution were revealed within the apparently uniform grass canopies, especially under direct light. The frequency distribution patterns of relative PPFD (RPFD) were compared among different solar and sky conditions. With increasing height in the canopy, the mean RPFD value and standard deviation (SD) increased, while the skewness and kurtosis of the distribution decreased. The mean RPFD and SD were higher, especially at higher solar elevation angles, under direct light than those under diffuse light conditions. The frequency distribution of RPFD was more platykurtic under direct light and at higher solar elevation angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348453
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
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