||Dose/Dose-Rate Responses of Shrimp Larvae to UV-B Radiation.
Damkaer, David M. ;
Dey, Douglas B. ;
Heron, Gayle A. ;
||Washington Univ., Seattle. Dept. of Oceanography.;Corvallis Environmental Research Lab., OR.
Radiation effects ;
Ultraviolet radiation ;
Radiation dosage ;
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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 W sq m (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 J sq m (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.