摘要
利用常规显微镜直接计数法 ,研究了大连近海两种优势桡足类小拟哲水蚤 (Para calanusparvus)和拟长腹剑水蚤 (Oithonasimilis )在不同温度、饵料密度、光照周期条件下摄食率的变化情况 ,并比较了其对不同饵料———新月菱形藻 (Nitzschiaclostertum)、亚心形扁藻 (Platymonassubcordiformis)、小球藻 (Chlorellasp )、球等鞭金藻 (Isochry sisgalbana)和盐藻 (Dunaliellasp )的选择比例和在同一外界条件下雌、雄成体的摄食率。结果表明 ,在桡足类生活的适宜范围内 ,温度与摄食率呈正相关 ;饵料密度与摄食率也呈正相关 ,超过上限浓度 ,摄食率下降 ;拟长腹剑水蚤在有光照时的摄食率大于在黑暗条件下的摄食率 ;小拟哲水蚤雌性成体的摄食率大于雄性成体的摄食率 ;桡足类摄食均以新月菱形藻为主 ,但最适饵料不是新月菱形藻 ,小拟哲水蚤的最适饵料是盐藻 。
Grazing rate of dominant adult copepods (\%Paracalanus parvus\% and \%Oithona similis\%) was studied using light microscopy under different temperature, feed densities, and photoperiod conditions, and varied in selective proportion of different feed species\% including Nitzschia clostertum, Platymonas subcordiformis, Chlorella \%sp\%., Isochrysis galbana, \%and\% Dunaliella \%sp. at the coast of Dalian from May to June, 2000. The grazing rates between male copepods and female copepods were compared. The results indicated that there was a positive correlation between the sea water temperature and grazing rate within the proper temperature range for copepod; and there was a positive correlation between feed density and grazing rate of copepods in the proper feed density range for copepod. When the feed density exceeded the upper limit, the grazing rates decreased. Ingestion rate of the female adults of \%P.parvus\% was higher than that of the male. The grazing rate in light condition was greater than that in dark circumstances for \%O.similis\%.The main species of ingesting feed was\% Nitzschia clostertun\%, but the optimal feed for \% P.parvus\% was \%Isochrysis galbana\%, and for\% O.similis, Dunaliella \%sp. was the optimal feed.
出处
《大连水产学院学报》
CSCD
北大核心
2002年第1期8-14,共7页
Journal of Dalian Fisheries University
基金
辽宁省博士启动基金资助 (0 0 1 0 5 2 )
