摘要
2007年1—12月对淮河中游浮游甲壳动物群落结构的季节动态进行研究。共记录浮游甲壳动物24种,其中枝角类8属13种、桡足类9属11种。枝角类在4月和9月形成两个峰值,即(28.2±21.6)ind/L和(40.8±10.1)ind/L,其优势种分别为僧帽溞Daphnia cucullata和脆弱象鼻溞Bosmina fatalis。捕食性桡足类—近邻剑水蚤Cyclops vicinus vicinus、广布中剑水蚤Mesocyclops leuckarti和台湾温剑水蚤Thermocyclops taihokuensis分别在4月、5月和6月形成较大的密度。汤匙华哲水蚤Sinocalanus dorrii和中华窄腹剑水蚤Limnoithona sinensis分别在5月和8月占优势。小型浮游植物(≤20μm)生物量在4月达到最大值,之后快速下降,而较大型浮游植物(>20μm)生物量从4月上升,到7月达到最大值。典型冗余分析(RDA)显示,溞属Daphnia的仲春下降与捕食性桡足类(尤其是近邻剑水蚤)的摄食压力、浮游植物生物量的季节变化密切相关。
Seasonal dynamics of community structure of crustacean zooplankton were studied throughout 2007. Twenty-four species were recorded, including eight genera and thirteen species for cladocerans and nine genera and eleven species for copepod. Two peaks of cladoceran density were observed in April and September, （28.2± 21.6） ind./L and （40.8±10.1） ind./L, respectively. The dominant species were D. cucullata and B. fatalis, respectively. The predatory copepod were C. vicinus vicinus, M. leuckarti and T. Taihokuensis, and their peak densities occurred in April, May and June, respectively. The relationship between predatory copepod density and Daphnia density was significant （r=0.541, n=48, P〈0.01）. S. dorrii and L. sinensis were dominant species in May and August, respectively. The maximum edible phytoplankton （≤20 μm） biomass appeared in April and then declined rapidly, while inedible phytoplankton （ 〉 20μm） biomass increased from April and peaked in July. Redundancy analysis （RDA） showed that mid-spring decline of Daphnia density was related to the feeding pressure of predatory copepod （especially C. vicinus vicinus） and seasonal variation of phytoplankton biomass.
出处
《水生生物学报》
CAS
CSCD
北大核心
2013年第5期869-875,共7页
Acta Hydrobiologica Sinica
基金
国家自然科学基金(31070387)
淡水生态与生物技术国家重点实验室开放项目(2007PB02)资助
关键词
淮河
浮游甲壳动物
溞属
群落结构
季节动态
Huaihe River
Crustacean zooplankton
Daphnia
Community structure
Seasonal variation
