By Don Freeman

As he and his buddies prepare to have fun Easter with a different social gathering, Corduroy wonders if the Easter Bunny is genuine.

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The cells in thick tissues therefore on average receive a lower irradiance, relative to the incoming irradiance, than cells in thin tissues as a consequence of self-shading. This effect can partly be counteracted by concentrating the strongly pigmented photosynthetic cells close to the surface of the organism, and letting cells deeper in the tissue function in maintaining strength, flexibility, transport and storage. The light path is very short through small microalgae. Only a small fraction of the incoming irradiance (< 10 %) is absorbed during passage, but the efficiency of absorption is large when expressed as the number of absorbed photons per amount of pigment or per unit length of the path.

Large macroalgae and plants constitute a special substratum, because they have a limited longevity (weeks to few years) and because the host plant can inhibit the epiphytes by consuming inorganic carbon and nutrients and by producing oxygen (Borum 1985, Sand-Jensen et al. 1985). During senescence of old host tissue the release of dissolved organic matter and nutrients can be utilized by the epiphyte community (Moeller et al. 1988). The epiphytic algae are mostly fast-growing microalgae, but if the host plant lives for a long time slow-growing algae will have sufficient time to colonize and grow.

Data compiled from many sources by Hein et al. (1995). The greater stimulation of α-values by small algal size may derive from the thinner diffusive boundary layers of small cells. The smaller size-dependence of Vmax-values may also be accounted for if larger algae have higher areal density of membrane transporters or better ability to supply them with energy and transfer the absorbed nutrients to deeper layers. 0 would mean a direct inverse proportionality with the linear dimension. The size dependence is markedly smaller than the inverse relationship to the diameter squared, previously calculated for spherical organisms (eq.

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