The effects of varied dissolved oxygen concentrations and temperature on the wood-boring isopod genus Limnoria |
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Authors: | J. W. Anderson D. J. Reish |
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Affiliation: | (1) Department of Biology, California State College at Long Beach, 90804 Long Beach, California, U.S.A.;(2) Present address: Department of Organismic Biology, University of California, Irvine, California, U.S.A. |
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Abstract: | Three species of the marine wood-boring genus Limnoria were subjected to low dissolved oxygen concentrations at different temperatures under laboratory conditions. 28-day median tolerance limits (TLm) were 1.0 mg/l of dissolved oxygen at 15° to 16°C and 19° to 20°C for L. lignorum, 0.75 and 0.60 mg/l at 15° to 16°C and 22° to 25°C, respectively, for L. quadripunctata, and 1.0 and 1.18 mg/l at 15° to 16°C and 22° to 25°C, respectively, for L. tripunctata. The amount of burrowing activity, as measured by the egestion rate, was directly related to the amount of dissolved oxygen. A daily egestion rate of 0.116 mg per day in L. tripunctata at 22° to 25°C was the highest figure measured. The daily egestion rate was sharply reduced at dissolved oxygen concentrations below 3.0 mg/l. |
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