The intensity and spectral composition of upwelling light in relation to the density of Chaoborus flavicans swarms

Authors: Horppila, J.; Nurminen, L.

Source: Fundamental and Applied Limnology / Archiv für Hydrobiologie, Volume 169, Number 3, July 2007 , pp. 259-263(5)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

The effects of swarms of Chaoborus flavicans larvae on the quantity and quality of reflected light were experimentally studied. When density of larvae was increased from zero to 7894 ind. m⁻², total light reflection (wavelength range 320-800 nm) increased from 7.8 to 9.4 %. At wavelengths < 400 nm, light decreased and at wavelengths 400-700 nm increased with increasing chaoborid density. The positive effect of chaoborids on light reflectance was strongest at wavelengths 600-700 nm. For wavelengths >750 nm, the effects of chaoborids on reflectance were insignificant. The positive effect of chaoborids on the reflectance of long wavelength light may reduce their visibility to predators in brown-water lakes were environment is dominated by long wavelength light.

Keywords: CHAOBORUS FLAVICANS; SWARMS; LIGHT REFLECTION; SPECTRAL COMPOSITION

Document Type: Research article

DOI: http://dx.doi.org/10.1127/1863-9135/2007/0169-0259

Publication date: 2007-07-01

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Volumes prior to vol. 168 were published under the previous title Archiv f�r Hydrobiologie.
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