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Responses of Leptasterias hexactis (Echinodermata: Asteroidea) to low salinity

I. Survival, activity, feeding, growth and absorption efficiency

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Abstract

The six-rayed starfish Leptasterias hexactis (Stimpson, 1862) is seasonally exposed to low salinities in southeastern Alaska. Individuals that were gradually exposed to reduced salinities in the laboratory had a 28-d TLm of 12.9‰ S. The activity of L. hexactis, as measured by its activity coefficient, varied directly with salinity. Individual feeding rates of the starfish on similarly exposed Mytilus edulis, measured daily for 21 d at salinities of 30, 20 and 15‰ S, also varied directly with salinity. The dry weight of mussel tissue consumed was 8.84, 8.49 and 0.58 mg ·starfish-1·d-1 at 20, 20 and 15‰ S. Expressed as percent of dry starfish weight, the daily feeding rate was 1.35, 0.76 and 0.10% at 30, 20 and 15‰ S. Absorption efficiency decreased from 64% at 30‰ S to 49% at 20‰ S, further reducing the energy available for metabolism. Growth, measured in terms of changes in total dry weight or dry weight of soft tissues, also varied directly with salinity. Although exposure to hyposmotic conditions did induce stress responses, as indicated by reductions in activity, feeding, absorption efficiency and growth rates, L. hexactis maintained positive growth for at least a 3-wk period in the laboratory at 20‰ S and 13°CC. The population of L. hexactis investigated must be considered euryhaline and brief periods of exposure to hyposmotic conditions should not limit its distribution.

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  1. Department of Zoology and Physiology, Louisiana State University, 70803, Baton Rouge, Louisiana, USA

    T. C. Shirley & W. B. Stickle

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  1. T. C. Shirley
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  2. W. B. Stickle
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Communicated by J. M. Lawrence, Tampa

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Shirley, T.C., Stickle, W.B. Responses of Leptasterias hexactis (Echinodermata: Asteroidea) to low salinity. Mar. Biol. 69, 147–154 (1982). https://doi.org/10.1007/BF00396894

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  • DOI: https://doi.org/10.1007/BF00396894

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