摘要
The effects of wavelength-specific visible light, white light, and ultraviolet-B (UV-B, 280- 315 nm) on selected behaviors, grazing rate, spawning rate, and hatching rate of the marine copepod Calanus sinicus collected from the Yellow Sea were studied. Calanus sinicus placed in a partitioned experimental system responded positively phototaxis to blue-cyan and yellow light but negatively to orange light and UVB. No obvious dodge activity was found among C. sinicus irradiated with <0.005 mW/cm^2 UV-B. Under 0.20, 0.30 and 0.50 mW/cm^2 UV-B radiation, the lethal half times of individuals were 30.47, 2.86, and 1.96 h, respectively. Grazing of C. sinicus was restrained at >0.10 mW/cm^2 UV-B, whereas yellow-red light stimulated grazing. Egg production rate was highest at a white-light intensity of 1.58 mW/cm^2, with an average rate of 10.04 eggs/(female·d). These results are consistent with the observed phenomenon that C. sinicus in the Yellow Sea mostly spawn near dawn. Our results indicate that light intensity and spectrum are important factors affecting the diel vertical migration of C. sinicus under natural conditions in the Yellow Sea.
The effects of wavelength-specific visible light,white light,and ultraviolet-B(UV-B,280-31 5 nm)on selected behaviors,grazing rate,spawning rate,and hatching rate of the marine copepod Calanus sinicus collected from the Yellow Sea were studied.Calanus s inicus placed in a partitioned experimental sy stem responded positively phototaxis to blue-cyan and yellow light but negatively to orange light and UVB.No obvious dodge activity was found among C.s inicus irradiated with<0.005 mW/cm^2 UV-B.Under0.20,0.30 and 0.50 mW/cm^2 UV-B radiation,the lethal half times of individuals were 30.47,2.86,and1.96 h,respectively.Grazing of C.sinicus was restrained at>0.10 mW/cm^2 UV-B,whereas yellow-red light stimulated grazing.Egg production rate was highest at a white-light intensity of 1.58 mW/cm^2,with an average rate of 10.04 eggs/(female d).These results are consistent with the observed phenomenon that C.sinicus in the Yellow Sea mostly spa.wn near dawn.Our results indicate that light intensity and spectrum are important factors affecting the diel vertical migration of C.sinicus under natural conditions in the Yellow Sea.
基金
Supported by the National Key R&D Program of China(No.2017YFC1404402)
the Science&Technology Basic Resources Investigation Program of China(No.2017FY100803)
the Project of Global Change and Air-Sea Interaction(No.GASI-02-PAC-STMSspr)
the National Natural Science Foundation of China(No.41306155)
