Dose/dose-rate responses of shrimp larvae to UV-B radiation |
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Authors: | David M. Damkaer Douglas B. Dey Gayle A. Heron |
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Affiliation: | (1) University of Washington WB-10, 98195 Seattle, WA, USA;(2) National Marine Fisheries Service/NOAA, 98353 Manchester, WA, USA |
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Abstract: | Summary Previous work indicated dose-rate thresholds in the effects of UV-B on the near-surface larvae of three shrimp species. Additional observations suggest that the total dose response varies with dose-rate. Below 0.002 Wm-2[DNA] irradiance no significant effect is noted in activity, development, or survival. Beyond that dose-rate threshold, shrimp larvae are significantly affected if the total dose exceeds about 85 Jm-2[DNA]. Predictions cannot be made without both the dose-rate and the dose.These dose/dose-rate thresholds are compared to four-year mean dose/dose-rate solar UV-B irradiances at the experimental site, measured at the surface and calculated for 1 m depth. The probability that the shrimp larvae would receive lethal irradiance is low for the first half of the season of surface occurrence, even with a 44% increase in damaging UV radiation.Contribution No. 1183 from the Department of Oceanography, University of Washington, Seattle, WA 98195, USA |
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