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THE EFFECT OF IRRADIANCE ON THE GROWTH OF DIFFERENT FORMS OF FRESHWATER DIATOMS: IMPLICATIONS FOR SUCCESSION IN ATTACHED DIATOM COMMUNITIES
Authors:Akihiro Tuji
Institution:Lake Biwa Research Institute, 1-10, Uchidehama, Otsu, Shiga, 520-0806, Japan
Abstract:The growth rates of 12 strains of attached freshwater diatoms were examined as a function of irradiance. The results were used to determine physiological parameters in the growth–irradiance relationships. Values of G max (maximum growth rate) and I  k (irradiance at half of G max) correlated with successional phase. The development of attached diatom communities appears to proceed from high irradiance species to low irradiance species that appear later in the successional sequence. Thus, efficiency of light use is linked to successional strategy, as has been documented for terrestrial plants.
Keywords:diatoms  functional form analysis  growth–irradiance relation  growth forms  microphytobenthos  periphyton  succession
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