Wave-induced variability of the underwater light climate in the littoral zone

摘要: Underwater irradiance, here referred to as photosynthetically active radiation (PAR), undergoes strong temporal fluctuations. These fluctuations are not only caused by variations in the incoming light intensity but also elevation and curvature of water surface resulting from wave motion (SNYDER & DERA 1970, KIRK 1994, ZANEVELD et al. 2001). In addition, wave-induced resuspension particles littoral zone can cause rapid changes attenuation within column. Thus, variability field is maximal at shallow depths (DERA GORDON 1968, RORSLETT 1997, SCHUBERT Light important for growth phytoplankton (FINGER 2007), biofilms, macrophytes (SCHEFFER 1993) affects habitat choice, food uptake, predation pressure fishes (UTNEPALM 2004, SCHLEUTER ECKMANN 2006). The biological relevance fluctuating determined fluctuations, scales (WALSH LEGENDRE 1983, PAHL-WOSTL 1992). We experimentally investigated underwater climate with intension providing amplitudes focussing, change resuspension.