. Elements of ecology. Ecology. 194 Light the seacoast and by submerged or floating vascular plants along the shores of inland waters in much the same way that light is cut down by the larger vegetation on land. In the free water of ponds, lakes, and the oceans the phytoplankton is sometimes sufficiently abundant to produce a noticeable reduction of light. Plankton populations may cause an additional extinction of light indirectly by adding detritus or stains to the water after the organisms have died and disintegrated. A thick "bloom" of algae in a pond may thus reduce the light sup
. Elements of ecology. Ecology. 194 Light the seacoast and by submerged or floating vascular plants along the shores of inland waters in much the same way that light is cut down by the larger vegetation on land. In the free water of ponds, lakes, and the oceans the phytoplankton is sometimes sufficiently abundant to produce a noticeable reduction of light. Plankton populations may cause an additional extinction of light indirectly by adding detritus or stains to the water after the organisms have died and disintegrated. A thick "bloom" of algae in a pond may thus reduce the light supply to such an extent as to curtail its own growth and that of other plants in the water layers G Y Wavelength Fig. Reduction in intensity and shift in spectral composition of light in heavily stained Rudolph Lake, Wisconsin. (Clarke, 1939, AAAS Ptibl. No. 10.) In temperate and coastal seas and in the majority of clear inland lakes fine particles or stains are present that tend to absorb or scatter the blue component of light more strongly than occurs in pure water. As a result the green component of sunlight is usually the most pene- trating in these situations and gives the water its characteristic emerald color. The organic stains occurring in some ponds and rivers absorb the shorter wavelengths so strongly that the red or orange components of sunlight become the most penetrating. In Rudolph Lake, Wiscon- sin, for example, the combined absorption of the water and of stains in the water causes not only a very rapid reduction in the light with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clarke, George L. (George Leonard), 1905-. New York, Wiley
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