Abstract
Clearance of polyethylene glycol (PEG), inulin, or dextran that had been injected into the hemolymph of the mussel, Dreissena polymorpha, was measured in animals acclimated to pondwater (PW) or 10% seawater (SW). In addition, we measured the clearance of PEG from mussels acutely transferred into 10% SW and following return to PW after acclimation to 10% SW. Clearance values calculated for PW-acclimated mussels ranged from 2.0 to 3.3 ml (g dry tissue · h)−1 and declined to 0.28 ml (g dry tissue · h)−1 in 10% SW-acclimated animals. Transferring mussels into 10% SW resulted in a reduction in PEG clearance from the blood, coincident with the reduction of osmotic gradient. When 10% SW-acclimated mussels were returned to PW the clearance of PEG increased to rates observed in PW-acclimated animals within 1 h. The PEG clearance remained constant during the re-acclimation to PW even though the osmotic gradient declined from about 100 to 30 mosmol kg−1. Clearance of the solutes used in this study was likely to be a measurement of renal filtration rate. The clearance values appeared to be maximal when the animals were in PW. The limited capacity to increase clearance in the face of an osmotic challenge may be a critical factor in restricting D. polymorpha to freshwater or lower salinity environments with small ranges in salinity.
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Dietz, T.H., Byrne, R.A. (1998). Effects of salinity on solute clearance from the freshwater bivalve, Dreissena polymorpha Pallas. In: EBO — Experimental Biology Online Annual 1996/97. EBO — Experimental Biology Online Annual, vol 1996/1997. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-00932-1_21
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DOI: https://doi.org/10.1007/978-3-662-00932-1_21
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