中文摘要：

为揭示莱州湾砂壳纤毛虫群落季节变化规律，在莱州湾设置8个站位，于2011年5—11月及2012年3_4月进行了9个航次的调查，用浅海Ⅲ型浮游生物网由底至表垂直拖网采集砂壳纤毛虫。结果表明，莱州湾3—11月砂壳纤毛虫物种丰富度的变化范围为5—19，周年变化呈现-峰两谷的趋势。丰度的范围为0-318ind．／L，丰度较大（＞50ind．／L）的种类有运动类铃虫（Codonellopsis mobilis）和清兰拟铃虫（Tintinnopsis chinglanensis）。各月平均丰度随时间的变化趋势为双峰型，最大值出现在7月（63ind．／L），次峰值出现在5月（48ind．／L），最小值出现在3月（2ind．／L）。黏着壳种类在3-11月均有出现，透明壳种类仅在温度较高（＞15℃）的6—9月出现。各月的优势种数目为1种（5月）到8种（8月），其中运动类铃虫在所有月中都是优势种，对砂壳纤毛虫丰度周年的变化规律产生较大影响。使用各月所有种类的平均丰度对各月砂壳纤毛虫群落进行聚类分析，得到两个群落（相似度30％）：群落I（7-9月）和群落Ⅱ（3-6月、10—11月），说明砂壳纤毛虫群落发生了明显的季节变化。砂壳纤毛虫的物种丰富度、丰度与环境因子（温度、盐度）均没有明显的相关性。

英文摘要：

The abundance and seasonal change of large-sized tintinnids were studied in Laizhou Bay. Large-sized tintinnids were collected by vertical towing using a shallow sea type III plankton net （open area 0.1 mE, mesh size 76 μm） during 9 cruises between May and November of 2011 and from March to April, 2012. The samples were fixed in formalin solution to a final concentration of 5% and counted using an inverted microscope in the laboratory. We sampled 8 stations to avoid fluctuations over a short time period. The purpose of this study was to characterize seasonal change of the large-sized tintinnid community. Maximum tintinnid species richness was 19 in August and minimum was 5 in May. Tintinnid abundance ranged from 0 ind./L to 318 ind./L. Average abundance at all stations was highest （63 ind./L） in July and lowest （2 ind./L） in March, and there was a secondary peak of 48 ind./L in May. The abundance of Codonellopsis mobilis and Tintinnopsis chinglanensis were more than 50 ind./L. Agglutinated species occurred from March to November, while the hyaline species only occurred from June to September when the temperature was 〉15℃. Codonellopsis mobilis occurred from March to November. The number of dominant species ranged from 1 in May, to 8 in August. Codonellopsis mobilis was a dominant species during all time periods and this one species significantly influenced the pattern of total ciliate abundance. Using the average abundance data of 8 sta-tions, two distinct cluster groups were observed （30% similarity）： cluster I （July to September） and cluster II （March to June, October to November）. The cluster results showed that there was a seasonal change of the large-sized tintinnid community. Average abundance and species richness were not significantly correlated with temperature and salinity.