Salinity sensitivity of early embryos of the Antarctic sea urchin, <Emphasis Type="Italic">Sterechinus neumayeri</Emphasis> |
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| Authors: | Dominique A Cowart Paul N Ulrich Douglas C Miller Adam G Marsh |
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| Institution: | (1) College of Marine and Earth Studies, University of Delaware, Lewes, DE 19958, USA;(2) Present address: Department of Biology, Pennsylvania State University, University Park, PA 16802, USA;(3) Present address: Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA 30602, USA |
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| Abstract: | Embryos and larvae of the Antarctic sea urchin, Sterechinus neumayeri, have received considerable experimental attention assessing impacts of low temperature on development; however, salinity
effects are not well documented because heretofore, the Antarctic coastal marine environment has been remarkably stenohaline.
In this study, subtle decreases of 2 and 4 parts per 1,000 in standard salinity were tested to see if the developmental rate
of S. neumayeri embryos would be impacted by a potential hyposmotic stress. At 30 psu, significantly fewer embryos (2 individuals out of
198 tested) reached morula stage by 36 h post-fertilization in comparison embryos in control treatments at 34 psu. Antarctic
sea urchins are an important component of marine environments due to their grazing activities. Reductions in larval recruitment
success due to the influx of freshwater from melting ice shelves resulting from global climate change could have far-reaching
impacts on benthic ecosystem structure in Antarctica. |
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| Keywords: | Development Sea urchin Salinity Embryos Antarctica |
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