CAJ | 학술논문

为了阐明三峡水库初次蓄水后干流库区枝角类的时空分布规律,2004年4月至2005年1月,在600余公里干流库区设置10个样点,定性和定量采集枝角类标本.本次调查共采到9种枝角类,其中春季8种,夏季5种,秋季2种,冬季3种.枝角类种类组成的空间分布差异明显,河流状态的江段有4种,水库状态的江段有7种,水库状态的江段距大坝越近,枝角类种类越丰富.枝角类的密度和生物量的空间分布和季节变化规律一致,季节间差异极显著(P<0.01),春季最高,夏季次之,秋季和冬季较低;空间分布上表现为在干流库区的纵向分布上差异极显著(P<0.01),河流状态样点远低于水库状态的样点,水库上游江段又低于下游坝前段.结果显示三峡水库的枝角类具有明显的纵向分布和季节变化特征.
위료천명삼협수고초차축수후간류고구지각류적시공분포규률,2004년4월지2005년1월,재600여공리간류고구설치10개양점,정성화정량채집지각류표본.본차조사공채도9충지각류,기중춘계8충,하계5충,추계2충,동계3충.지각류충류조성적공간분포차이명현,하류상태적강단유4충,수고상태적강단유7충,수고상태적강단거대패월근,지각류충류월봉부.지각류적밀도화생물량적공간분포화계절변화규률일치,계절간차이겁현저(P<0.01),춘계최고,하계차지,추계화동계교저;공간분포상표현위재간류고구적종향분포상차이겁현저(P<0.01),하류상태양점원저우수고상태적양점,수고상유강단우저우하유패전단.결과현시삼협수고적지각류구유명현적종향분포화계절변화특정.
To reveal patterns of longitudinal distribution, seasonal variation, and ecological succession in cladocerans communities in the Three Gorges Reservoir, ten sites were used to sample cladoceran communities across a longitudinal gradient from April, 2004 to January, 2005. Nine cladoceran species were collected throughout the year. Species richness was highest in spring (8 species), lower in summer (5 species) and winter (3 species), and lowest in autumn (2 species). Cladoceran species composition varied across sampling sites. Four species were collected from river sampling sites and seven species from reservoir sampling sites. Cladoceran species richness decreased gradually with increasing distance to the dam within the reservoir area. Cladoceran density and biomass varied among seasons (P <0.01) and sampling sites (P <0.01), and both were highest in spring. Density and biomass of cladocerans in river areas were lower than in the reservoir area. Density and biomass of cladoceran in up area of reservoir was lower than that in down area of reservoir. The cladoceran communities of the Three Gorges Reservoir showed distinct patterns in both longitudinal distribution and seasonal variation.