. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. 50 Nature of Aquatic Environment sumption of nitrates by plancton algae. Nitrates, be- cause they furnish nitrogen supply in the form at once available for plant growths, are, in shallow waters at least, an index of the fertility of the water. As on land, so in the water, the supply of these may be inadequate for maximum productiveness, and they may be added with profit as fertilizer. The carbonates—Lime and magnesia combine with carbon dioxide, abstracting it from the water,
. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. 50 Nature of Aquatic Environment sumption of nitrates by plancton algae. Nitrates, be- cause they furnish nitrogen supply in the form at once available for plant growths, are, in shallow waters at least, an index of the fertility of the water. As on land, so in the water, the supply of these may be inadequate for maximum productiveness, and they may be added with profit as fertilizer. The carbonates—Lime and magnesia combine with carbon dioxide, abstracting it from the water, forming. Fig. 9. Environs of the Biological Field Station of the Illinois State Labora- tory of Natural History, the scene of important work by Kofoid and others on the life of a great river. solid carbonates (CaCOs and MgCOs). These accimiu- late in quantities in the shells of molluscs, in the stems of. stoneworts, in the incrustations of certain pond weeds, and of lime-secreting algae. The remains of such organisms acciunulate as marl upon the bottom. The carbonates (and other insoluble minerals) remain; the other body compounds decay and are removed. By such means in past geologic ages the materials for the earth's vast deposits of limestone were accumu-. 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 Needham, James G. (James George), 1868-1956; Lloyd, John Thomas, 1884- joint author. Ithaca,N. Y. , The Comstock Publishing Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1915
