食物种类对萼花臂尾轮虫种群增长率的影响(英文)  

Influence of food-type on the population growth rate of the rotifer Brachionus calyciflorus in short-chronic assays

作　　者：M.LüRLING W.BEEKMAN 

机构地区：[1]Department of Environmental Sciences,Aquatic Ecology and Water Quality Management Group,Wageningen University,P.O.Box 8080,6700 DD Wageningen,The Netherlands

出　　处：《动物学报》2006年第1期70-78,共9页ACTA ZOOLOGICA SINICA

基　　金：ThisresearchwasfundedbyafellowshipfromtheRoyalNetherlandsAcademyofArtsandSciences

摘　　要：在短期慢性观测过程中,食物类型可能是造成萼花臂尾轮虫(Brachionuscalyciflorus)种群繁殖率变化的一种原因。共观测了分别单独投喂10种不同绿藻对轮虫种群增长率的影响。为验证藻青菌是藻类饵料(如绿藻Scenedesmus)有价值的佐剂这一假说,还用蓝细菌单独投喂或与斜生栅藻(Scenedesmusobliquus)混合投喂轮虫进行实验观测。结果发现食物种类对萼花臂尾轮虫种群增长率影响显著。斜生栅藻组获得最大种群增长(1.6/d),而Desmodesmus组增长率最低(0.3/d)。以占斜生栅藻组最大增长的百分率来表示,其它几种绿藻组种群增长由高到低依次为:Desmodesmussubspicatus88%,小球藻(Chlorellavulgaris)83%,单壳缝藻(Monoraphidiumminutum)77%,D.quadricauda74%,S.falcatus71%,S.acuminatus69%,S.pectinatus64%,莱茵衣藻(Chlamydomonasreinhardtii)57%,D.abundans19%。轮虫增长率的差异不能用藻类饵料的大小差异来解释。蓝细菌(Microcystisaeruginosa)和(Synechococcuselongates)不论是单独投喂还是与优良藻类饵料(斜生栅藻)混合投喂都对萼花臂尾轮虫种群增长有抑制作用。这种副作用似乎与微囊藻素无关。该结果不支持无毒蓝细菌可作为与其他绿藻饵料配合使用的优良佐剂这一假说。本研究所观察到的生长变化显示了饵料种类对萼花臂尾轮虫种群增长的影响。The type of food given during short chronic assays with the rotifer Brachionus calyciflorus might be one of the sources of variation in the reproductive rate of the rotifers. Ten green algal species were supplied as monospecific diets to examine variability in rotifer growth rate. In addition, rotifers were fed cyanobacteria as monospecific food and in mixtures with the green alga Scenedesmus obliquus to test the hypothesis that cyanobacteria are a valuable supplement in combination with food items such as Scenedesmus. The population growth rate of B. calyciflorus was influenced significantly by the different green algal food species. S.obliquus promoted the highest growth in B.calyciflorus （1.6 per day）, while growth on Desmodesmus abundans was the lowest （0.3 per day）. As percentage of maximal growth on S.obliquus, the sequence of green algal food species is： Desmodesmus subspicatus （88%）, Chlorella vulgaris （83%）, Monoraphidium rninutum （77%）, D . quadricauda （74%）, S. falcatus （71%）, S. acuminatus （69 % ）, S. pectinatus （64 % ）, Chlamydornonas reinhardtii （57%） and D. abundans （19 % ）. The growth differences were not explained from size differences of the algae. The cyanobacteria,a Microcystis aeruginosa and Synechococcus elongatus depressed growth of B. calyciflorus not only as monospecific food but also in mixed diets with the good food source S. obliquus. The detrimental effect appeared not related to microcystins. The results do not support the hypothesis that nontoxic cyanobacteria are a valuable supplement in combination with other green algal food species. The variation in growth rates observed in current study underlines the influence food species might have on the growth of B. calyciflorus and potentially on the outcome of toxicity tests [ Acta Zoologica Sinica 52 （1）- 70 - 78, 2006].

关 键 词：萼花臂尾轮虫 种群增长 食物种类 藻类饵料 

分 类 号：S963.214[农业科学—水产养殖]