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Scheide, J.I. and P.N. Bonaminio, 1994. Effect of Low Water Temperature on Ion Balance in the Zebra Mussel, Dreissena polymorpha, and the Unionid Mussel, Lampsilis radiata, Central Michigan University. Reprinted from Nautilus (1994) 107(4): 113-117 with kind permission from The Bailey-Matthews Shell Museum Effect of Low Water Temperature on Ion Balance in the Zebra Mussel, Dreissena polymorpha, and the Unionid Mussel, Lampsilis radiataDreissena polymorpha, acclimated to room temperature (21 +/- 1-degrees-C) for 51 days in artificial pondwater, exhibits higher hemolymph sodium, chloride, potassium and total osmolarity than mussels acclimated to 4-5-degrees-C (cold), while hemolymph calcium was increased with cold treatment. The room temperature acclimated mussel hemolymph ion concentrations, maintained for 51 days in artificial pondwater, were similar to those measured from mussels sampled in the field. Cold-acclimation caused Lampsilis radiata hemolymph sodium, chloride and osmolarity values to decrease, while calcium and the ''other'' ions, presumably bicarbonate, increased. The positive net sodium and chloride flux and the calcium loss of zebra mussels acclimated to room temperature was reduced upon direct transfer into cold pondwater. Sodium and chloride net uptakes were increased in cold-acclimated zebra mussels with an acute increase in pondwater temperature while calcium and potassium net loss increased. The effects of cold storage on zebra mussels needs to be recognized due to possible changes in the physiology of the mussel with this treatment. Entire Paper |
