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中文摘要：
2005年和2006年夏秋季, 宁波一消防池中出现信阳桃花水母（Craspedacusta sowerbyi xinyangensis） , 对池中的浮游生物种类组成及种群数量变动特征进行了研究, 并与未出现桃花水母的年份进行了比较分析。共记录浮游植物85种, 分属8门53属, 以绿藻门居优势占种类总数的42.35%, 优势种为蓝、绿藻门的小球藻（Chorella vulgaris）、银灰平裂藻（Merismopedia glauca）和不定微囊藻（Microcystis incerta）; 浮游动物记录44种属, 原生动物和轮虫占绝对优势, 分别占种类总数的47.74%和45.45%, 优势种为多肢轮虫（Polyarthra sp.）。浮游植物丰度值高峰出现在11月为14065.60×10^4 ind/L, 蓝藻丰度居首位占61.05%; 浮游动物丰度呈现5月和11月两个高峰, 5月最高达5580 ind/L, 7月最低为900 ind/L; 原生动物和轮虫的丰度分别占总丰度的48.28％和43.92％, 桡足类只占7.73％, 生物量以轮虫最大。轮虫和桡足类数量在桃花水母出现前均达到高峰; 桃花水母出现盛期轮虫丰度最低; 桃花水母消失后再度回升; 浮游植物、浮游动物和桃花水母三者处于动态平衡。桃花水母出现前至出现中期的4—8月份, 池水为“寡污-中富营养类型”水质; 水母出现末期及消失后的9—11月, 发展为“中污-极富营养类型”水质。
英文摘要：
In order to investigate a internal relationship between emergence time and quantity changes of Craspedacusta and plankton, and to evaluate the water quality of Craspedacusta’ habitat by Margalef and Menkinick diversity index, the water sample and Craspedacusta were collected in a small fire-fighting pond in Ningbo, Zhejiang Province from Nov, 2005 to Dec, 2005 and from Jan, 2006 to Oct, 2006. This kind of jellyfish was identified as Craspedacusta sowerbyi xinyangensis. The water in the fire-fighting pond mainly came from rain. The area of the pond was roughly 50 m2 and about 2—3 m in depth. While collecting, the water temperature was 5.7—30.2℃, pH 6.7—7.9, the color of the water is green, with a transparency 0.55—1.45 cm. Craspedacusta’s life cycle underwent two alternating generations： sexual （medusa） and asexual （polyp）. We gained Craspedacus （medusa） periodically by the microplankton net when it appeared （6—10 month） and collected the water sample monthly. In addition, the water sample was also collected every other month in 2007 when Craspedacus did not appeared for comparing the analysis. The main results were as follow： 1） Totally 85 species remaining with phylum 8 and genera 53 were recorded. Chlorophyta was absolutely predominant in the species composition, representing 42.35% of the total phytoplankton. The dominant species of Cyanophyta and Chlorophyta mainly contained Chorella vulgaris, Merismopedia glauca and Microcystis incerta. There were 44 species in zooplankton, among which, rotifer and protozoan were absolutely predominant in the species composition, and accounting for 47.74% and 45.45% of the total of zooplankton respectively. The dominant species of zooplankton mainly contained Polyarthra sp. 2） There was a abundance peak value of phytoplankton in November to 14 065.60 ×10^4 ind/L. The abundance of Cyanophyta was premier, representing 61.05% of the total; The abundances of zooplankton had two peak value in May and November, which had the maximum abundan
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