中文摘要：

空间分发和许多小鱼在在克绍西海·莱克，的秋天 2007 被研究沿着 Changjiang (Yangtze ) 河的中间的活动范围的一个浅湖。基于植物盖子，湖被划分成三个主要产地：Myriophyllum spicatum 产地(MS 产地) ， Trapa bispinosa 产地(TB 产地) ，和非植被产地(NV 产地) 。一张修改流行音乐网在三个产地被用于小鱼的量的采样，并且 Zippin 鈥檚 移动方法被用于估计小鱼的密度。属于 5 个家庭的 13 种类的一个总数是镇定的，与在 MS 产地，在 TB 产地的 7 种类，和在 NV 产地的 5 种类的 11 种类。产地类型在小鱼的空间分发上有重要效果。在 MS， TB 和 NV 产地的 Shannon 牛肉熏香肠差异索引分别地是 1.28， 0.56 和 0.54。小鱼的全部的密度和生物资源比在 TB 产地( 1.41 ind/m2 和 0.54 g/m2 )和 NV 产地( 1.08 ind/m2 和 0.40 g/m2 )在 MS 产地( 13.68 ind/m2 和 4.44 g/m2 )是显著地更高的，并且不在 TB 产地和 NV 产地之间是显著地不同的。水深度没在小鱼的空间分发上有重要效果。植被类型在小鱼的产地选择起了一个重要作用，这被建议，并且在水下的植被的存在应该具有在小鱼差异的保存的意义。关键词小鱼-空间分发-丰富评价-产地选择-克绍西海·莱克由中国的国家自然科学基础支持了(Nos. 30571440 ， 30830025 )，国家关键技术 R&D 节目(号码 2007BAD37B03 )和中国( 973 节目)(号码 2007CB109205 )的国家基本研究节目

英文摘要：

Spatial distribution and abundance of small fishes were studied in autumn 2007 in the Xiaosihai Lake, a shallow lake along the middle reach of the Changjiang （Yangtze） River. Based on the plant cover, the lake was divided into three major habitats： Myriophyllum spicaturn habitat （MS habitat）, Trapa bispinosa habitat （TB habitat）, and non-vegetation habitat （NV habitat）. A modified pop-net was used for quantitative sampling of small fishes in the three habitats, and the Zippin＇s removal method was used for estimating densities of the small fishes. A total of 13 species belonging to 5 families were collected, with 11 species in MS habitat, 7 species in TB habitat, and 5 species in NV habitat. Habitat type had significant effect on the spatial distribution of small fishes. The Shannon-Wiener diversity index in the MS, TB and NV habitats were 1.28, 0.56 and 0.54, respectively. The total density and biomass of small fishes were significantly higher in the MS habitat （13.68 ind/m^2 and 4.44 g/m^2） than in the TB habitat （1.41 ind/m^2 and 0.54 g/m^2） and the NV habitat （1.08 ind/m^2 and 0.40 g/m^2）, and were not significantly different between the TB habitat and the NV habitat. Water depth had no significant effect on spatial distribution of the small fishes. It was suggested that vegetation type played an important role in habitat selectivity of small fishes, and the presence of submersed vegetation should be of significance in the conservation of small fish diversity.