Temperature-time relationships for survival of embryos and larvae of Mulinia lateralis (Mollusca: Bivalvia) |
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Authors: | V S Kennedy W H Roosenburg H H Zion M Castagna |
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Institution: | (1) Chesapeake Biological Laboratory, Natural Resources Institute, University of Maryland, Solomons, Maryland, USA;(2) Eastern Shore Laboratory, Virginia Institute of Marine Science, Wachapreague, Virginia, USA;(3) The Librarian, Chesapeake Biological Laboratory, Box 38, 20688 Solomons, Maryland, USA;(4) Present address: Department of Zoology, University of Cantebury, Christchurch 1, New Zealand |
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Abstract: | The influence of temperature over 8 time intervals on survival of cleavage stages, trochophore larvae, and straighthinge veliger larvae of Mulinia lateralis (Say) was investigated using a thermal gradient apparatus. There was a direct relationship of mortality with increased period of exposure. As the clams aged, temperature tolerance increased, with cleavage stages being most sensitive to higher temperatures and straight-hinge larvae least sensitive. Multiple-regression equations were developed to allow prediction of percentage mortalities under different conditions of temperature and time exposure. Entrainment of M. lateralis embryos and larvae in the cooling-water systems of steam-electric power plants should be as short as possible to keep mortality toa minimum.Contribution No. 550 of the Natural Resources Institute, University of Maryland, and Contribution No. 531 of the Virginia Institute of Marine Science. |
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