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  • Fish ear  (1)
  • Light fluctuation  (1)
  • Springer  (2)
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  • Springer  (2)
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Auditory sensitivity of the cichlid fish Astronotus ocellatus (Cuvier) (1992)
    Springer
    Journal of comparative physiology 171 (1992), S. 105-109 
    Details
    ISSN: 1432-1351
    Schlagwort(e): Astronotus ocellatus ; Audiogram ; Acoustic ; sensitivity ; Fish ear ; Non-otophysan fish
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00195965
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Fluctuation of photosynthetic photon flux density within aMiscanthus sinensis canopy (1988)
    Springer
    Ecological research 3 (1988), S. 253-266 
    Details
    ISSN: 1440-1703
    Schlagwort(e): Light fluctuation ; Microsite ; Miscanthus sinensis ; Photosynthetic photon flux density ; Sunflecks
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Detailed measurements of diurnal variations in photosynthetic photon flux density (PPFD) were made at seven locations within the canopy of aMiscanthus sinensis grassland to evaluate the light conditions of microsites for heliophilic tree seedlings. Multiple regression analysis revealed that the short-term light fluctuation on a clear day was highly dependent on the wind speed and solar elevation angle, whereas on a cloudy day it was mainly determined by the PPFD incident from above the canopy. The relative PPFD at 40 cm aboveground varied from 0.065 to 0.252, depending on sky conditions and the sensor's position in relation to clumped patches ofM. sinensis. On a clear day, the proportion of PPFD readings above 100 μmol·m−2·s−1 contributed by sunflecks ranged between 25.4% and 82.0%. Computer simulation showed that the contribution of sunflecks to the daily carbon gain ofQuercus serrata seedlings may range from 11% to 65%. The mean relative PPFD measured under diffuse light conditions was linearly related to the daily total PPFD and the daily carbon gain by single leaves ofQ. serrata seedlings. This suggests that the relative PPFD under diffuse light conditions provides an appropriate measure of site-specific light availability within a grass canopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02348584
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
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