Abstract: Fiber spectrophotometer and avian visual modeling were adopted to quantitatively analyze the egg color of Chinese Pond Heron (Ardeola bacchus) in Linao and Chengmai of Hainan Island during the breeding season from April to July, 2009. The egg reflectance spectra showed that the wave crest was located on the range of medium wave, with a peak on green light zone. The blue-green egg color of A. bacchus could be an adaptation to predation, nesting habitat, or sexual selection by male. The analysis based on avian visual modeling indicated that the egg chroma, brilliance, and hue UV had no significant differences between Chengmai and Lingao populations, but the hue RGB was significantly different. Robinson Project showed that the variation of egg hue RGB was larger for Chengmai population than for Lingao population, possibly due to the difference in brood parasitism pressure or nest habitat characteristics between Chengmei and Lingao.

Key words: Rice, Enhanced UV-B radiation, Polyamine metabolism, Endogenous hormone