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Studies in the Ecology of Rivers: IV. Observations on the Growth and Distribution of the Sessile Algae in the River Hull, Yorkshire

R. W. Butcher
Journal of Ecology
Vol. 28, No. 1 (Feb., 1940), pp. 210-223
DOI: 10.2307/2256170
Stable URL: http://www.jstor.org/stable/2256170
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Studies in the Ecology of Rivers: IV. Observations on the Growth and Distribution of the Sessile Algae in the River Hull, Yorkshire
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Abstract

The algae that grow on submerged glass slides were collected at four places on the river Hull over a period of 2|frac12 years. The Hull is a canal and the water is hard, mildly polluted by sewage and contains a plentiful supply of dissolved salts. The number of algae growing on the slides is rather less than what is found in other calcareous waters but more than in non-calcareous waters. The dominant algae are Cocconeis placentula and Ulvella frequens. This community has been found in rivers in which the one character in common seems to be a plentiful supply of nitrates and other mineral salts. No community characteristic of hard waters can be seen. There is no seasonal variation and this may be because nutritive salts are always superabundant. The author wishes to express his best thanks to Mr N. C. Akers of Hornsea who collected all the slides for three years and without whose assistance this work could not have been completed.

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