中文摘要：

台湾海峡与唯一的水文学和创造特殊海洋的社区特征的地理环境是在华东海和华南海之间的一个转变地区。在台湾海峡分析空间结构和自游生物集合的季节的变化，季节的试验性的拖网调查在 2006-2007 期间被进行。结果证明在有种类的不同集合的区域有二个集合，并且在每个组以内的平均类似在 39.38% 和 74.20% 之间变化。由使用 multivariate 统计分析并且分析主导的种类的分发，我们发现集合的结构有明显的季节的变化。到厦门横断的从 Putian 横断的中间的区域能为二个集合被认为一个混合区域。在种类集合和环境因素之间的关系的分析显示温度是在冷季节，和 22.5 牧摡摥戠瑵琠敨 ? 愠摮 ? 影响社区结构的最重要的因素 ?? 潣汵?潮 t

英文摘要：

The Taiwan Strait is a transition zone between the East China Sea and the South China Sea with unique hydrology and a geographical environment that creates special marine community features.To analyze the spatial structure and seasonal changes of the nekton assemblages in the Taiwan Strait,seasonal experimental trawl surveys were conducted during 2006-2007.The results showed that there were two assemblages in the area with different sets of species,and the average similarity within each group varies between 39.38% and 74.20%.By using multivariate statistical analysis and analyzing the distribution of dominant species,we found that the structures of the assemblages had obvious seasonal variation.The middle region from the Putian transect to the Xiamen transect could be considered a mixing area for the two assemblages.The analysis of the relationship between species assemblages and environmental factors indicated that temperature was the most important factor affecting the community structure in cold seasons,and 22.5°C and 17°C could be considered dividing lines for spring and winter,respectively.In warm seasons,the most important factor was water depth,but the relationship with depth was not as significant,with a correlation between 0.264 and 0.399.The seasonal changes of nekton assemblages basically reflected the dynamic currents in the Taiwan Strait.The south coastal assemblage extended to nearly the entire area of the Taiwan Strait along with a strong and intense warm current that shrinks in spring and winter when the southward intrusion of the cold Zhejiang-Fujian coastal current becomes stronger.The impact of shortterm and long-term environmental changes,such as extreme weather,global warming and human activity on nekton assemblages,had been recognized but need further research.Our study on nekton assemblages could be used as a baseline for measuring future changes.