摘要
本文比较了太湖梅梁湾敞水区2004年秋季渔汛期刀鲚(Coilia ectenes)和间下(鱼箴)(Hyporhamphus intermedius)的食性,同时对不同食物的重要性、选择性以及两种鱼类食物的重叠进行了分析．结果表明,秋季刀鲚、间下(鱼箴)的食物主要由浮游甲壳动物、鱼和昆虫等组成．镖水蚤中的指状许水蚤(Schmackeria inopinus)是刀鲚最重要的食物,而间下(鱼箴)最重要的食物是裸腹溞(Moina sp．),而且摄食鱼和昆虫的比例远高于刀鲚．刀鲚和间下(鱼箴)对个体较大的指状许水蚤的选择性都比较高,对个体较小、而在太湖密度很高的象鼻溞(Bosmina spp．)都表现出主动回避．刀鲚与间下(鱼箴)的食物重叠系数较高,表明对竞争比较激烈,但要完全了解这两种鱼类的竞争关系,还要对它们在太湖的分布,不同发育阶段和不同季节的摄食情况进行详细的调查研究．
The feeding habits of Coilia ectenes and Hyporhamphus intermedius of Meiliang Bay of Lake Taihu were investigated in autumn, 2004. The relative importance, selectivity of different food items and the diet overlap between the two fish were also analyzed. The results showed that the man food of C. ectenes and H. intermedius included planktonic crustaceans, fish and insects. Calanoid copepod Schmackeria inopinus was the most important food for C. ectenes, while cladoceran Moina sp. played the most significant role in the food of H. intermedius. H. intermedius fed a much higher proportion of fish and insects than C. ectenes. Both C. ectenes and H. intermedius showed a high positive selection for S. inopinus, but negative selection for Bosmina spp. , the most numerous cladoceran in Lake Taihu. Diet overlap between C. ectenes and H. intermedius was significant which indicates a strong competition existed. However, in order to have a complete understanding of the competition between C. ectenes and H. intermedius, it needs a further investigation on distribution, ontogenetic and seasonal characteristics of the feeding of both fish species in Lake Taihu.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2007年第2期218-222,共5页
Journal of Lake Sciences
基金
中国科学院知识创新重大项目"长江中下游地区湖泊富营养化的发生机制控制对策研究"(KZCX1-SW-12)
国家863计划项目"太湖水源地水质改善技术"(2002AA60101)联合资助
关键词
太湖
刀鲚
间下鱵
食性
食物重叠
Lake Taihu
Coilia ectenes
Hyporhamphus intermedius
feeding habit
diet overlap
