摘要
为认识我国南亚热带地区以杂食性鱼类为主的水库中级联反应的特点,文章于2009年9～11月在贫-中营养水库-流溪河水库进行了围隔（体积约为85 m3）实验.包括控制组在内,共3个处理,每个处理有3个重复.控制组为水库原水,不添加营养盐和罗非鱼;处理组：（1）在水库原水中添加营养盐;（2）水库原水中添加罗非鱼.通过比较添加营养盐组与空白组,分析了浮游生物对营养盐的响应;比较添加罗非鱼组与空白组,分析了鱼对浮游生物的作用.在添加营养盐组中,浮游植物丰度和生物量都升高,添加营养盐使浮游动物的丰度和生物量显著增加.桡足类的优势种以无节幼体、桡足幼体,舌状叶镖水蚤、中剑水蚤等为主,枝角类的网纹溞、裸腹溞、象鼻溞等的丰度和生物量均明显地受到鱼类捕食的影响.当鱼类的生物量较低或不存在时,滤食性枝角类可能成为优势种群.
In order to understand trophic cascades effects of omnivorous fish （tilapia） in warm waters, an enclosure experiment was carried out in Liuxihe Reservoir, an otigo-mesotropbic water body, from September 10 to November 14 of 2009.9 enclosures in total were used, each enclosure has a water volume of 85 m3. There are 3 treatments; there are three replicates for each treatment. In the control treatment （C）, the water was pumped from the reservoir after filtering small fish, other two treatments included： （1） adding nutrients to enclosure in the filtered reservoir water, （2） adding tilapia to the enclosure （F）. The response of plankton to nutrient addition（N） was analyzed through the controls; the effect of tilapia on plankton was analyzed through the controls. In the N treatment, the abundance and biomass ofphytoplankton increased, the abundance and biomass of zooplankton increased markedly. In all the encousres, zooplankton were dominated by copepods, such as Phyllodiaptomus tunguidus, Mesocyclops thermocyclopoides. The cladocerans were mainly composed of Bosmina longirostris, Moina micrura, Diaphanosoma orghidani and Ceriodaphnia cornuta. In the F treatment, the abundance and biomass of Bosmina longirostris, Moina micrura and Ceriodaphnia cornuta was evidently influenced by fish predation.
出处
《广东化工》
CAS
2014年第8期41-42,共2页
Guangdong Chemical Industry
关键词
南亚热带水库
围隔
浮游植物
浮游动物
营养盐
罗非鱼
southern sub-tropical reservoir： enclosure： phytoplankton
zooplankton： nutrient： tilapia
