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Journal of Plankton Research Vol.23 no.2 pp.143-156, 2001
© Oxford University Press 2001

Influence of mid-ultraviolet (UVB) radiation on the physiology of the marine planktonic copepod Acartia omorii and the potential role of photoreactivation

Dorothy G. Lacuna and Shin-Ichi Uye

Graduate School Of Biosphere Sciences, Hiroshima University, 4–4 Kagamiyama 1 Chome, Higashi-Hiroshima, 739–8528, Japan

The damaging effect of mid-ultraviolet (UVB, 280-320 nm) radiation on the marine planktonic copepod Acartia omorii was investigated by using egg-hatching success, survival of various naupliar and copepodite stages, and feeding and egg production of adult females, as physiological parameters under different radiation conditions in the laboratory. No deleterious effect was induced by UVA (320-400 nm) or PAR (400-700 nm), but UVB inflicted a more damaging effect with increasing UVB dose, Among various life stages, eggs, particularly freshly-spawned ones (< 2 hold), were most susceptible50= 2.76 kJ m–2) and adult females least susceptible (LD50= 22.0 kJ m–2). The feeding and egg production of adult females were not significantly reduced until the UVB dose was elevated to 15.0 kJ m–2. The UVB-induced damage was alleviated under simultaneous irradiation with enhanced PAR. This photorepair mechanism was more effective for eggs compared with older stages. Our outdoor experiment using solar UVB demonstrated that present-day levels of solar UVB radiation caused reduced hatching success of A. omorii eggs. In the habitat of A. omorii, however, due to high attenuation properties of the water, the solar UVB radiation may affect only young developmental stages distributed near the sea surface.


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