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The Aquatic Vegetation of the English Lakes

W. H. Pearsall
Journal of Ecology
Vol. 8, No. 3 (Dec., 1920), pp. 163-201
DOI: 10.2307/2255612
Stable URL: http://www.jstor.org/stable/2255612
Page Count: 39
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The Aquatic Vegetation of the English Lakes
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Abstract

The evidence presented in the preceding pages from the study of the aquatic plant communities of the English Lakes, seems to justify certain general conclusions for this lake area: (1) The distribution of the aquatic plants considered is primarily governed by the nature of the substratum, while the reaction of the substratum to vegetation is controlled by variations in the quality and quantity of sediments deposited on it and by the type and quantity of organic matter it contains. (2) Light intensity may limit the depth to which types of vegetation descend, but is of secondary importance as a factor in the distribution of most of the plants considered. (3) Temperature conditions are assumed to retard the development of vegetation during early summer, but in other respects to be of little significance. (4) The absence of free floating vegetation is attributed to the paucity of the waters in essential plant food substances. (5) Plant succession is accompanied by changes in the substratum akin to those resulting in the formation of moor peat.

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