花背蟾蜍繁殖种群食物多样性及营养生态位的研究

作者于１９９５年４～５月份在长春市调查了花背蟾蜍繁殖种群不同繁殖时期的食性，并通过食物多样性和营养生态位对食性变化进行了分析。结果表明，繁殖种群繁殖后的食物多样性指数、营养生态位宽度较繁殖期为大；繁殖期和繁殖后的食物百分率相似性指数及营养生态位重叠值小，而食物百分率相异性及营养生态位分离值大。繁殖期雄体的食物多样性指数及营养生态位宽度均大于雌体，繁殖后雌体的食物多样性指数及营养生态位宽度均大于雄体，雌雄个体间的食物百分率相异性指数及营养生态位分离值小。摄食活动性受繁殖影响，并随繁殖结束而增强。

FOOD DIVERSITY AND TROPHIC NICHE OF THE BREEDING POPULATION OF BUFO RADDEI

Based on the food habit of the breeding population of Bufo raddei, the food diversity and trophic niche were studied in Changchun,Jilin province in 1995 from April to May.Both the index of food diversity and the breadth of trophic niche of the population were greater after reproduction.Both the index of food percentage similarity and the overlap of trophic niches between breeding period and post breeding period were lower.During reproduction both the index of food diversity and the breadth of trophic niche of the males were greater than those of the females,but were lower after reprodution.Both the index of food dissimilarity and the separation of trophic niche between males and females were lower after reproduction.Reproduction affected the animal's food intake.The toads did not take in much food until finished reproduction.