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The Distribution of the Amphipod Gammarus pseudolimnaeus Bousfield as Influenced by Oxygen Concentration, Substratum, and Current Velocity

Colin P. Rees
Transactions of the American Microscopical Society
Vol. 91, No. 4 (Oct., 1972), pp. 514-529
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3225480
Stable URL: http://www.jstor.org/stable/3225480
Page Count: 16
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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.
The Distribution of the Amphipod Gammarus pseudolimnaeus Bousfield as Influenced by Oxygen Concentration, Substratum, and Current Velocity
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Abstract

An attempt was made to delineate the variable effects of the physical nature of the substratum, the current velocity, and dissolved oxygen concentration on the distribution of the amphipod Gammarus pseudolimnaeus. A series of experiments designed to evaluate the relationship between oxygen consumption and substratum particle size under both still- and flowing-water conditions shows that as the particle size increases or decreases from φ -4.0 (16-32 mm diameter), oxygen consumption rises, the absolute levels varying according to the rate of flow. An inverse relationship is manifest when data from substratum selection studies and oxygen consumption levels over particle types are compared. In this connection, it is noteworthy that individual specimens entrapped in small glass-tygon tubes consume less oxygen and demonstrate a greater capacity for regulation (reflected in a decreased number of pleopod beats) and that field and laboratory substratum selection experiments indicate a significant correlation between body size and choice of substratum category. The experimental maximal current speed against which G. pseudolimnaeus can move approximates the maximum speed at which the amphipod is taken in nature.

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