高州水库轮虫垂直分布的季节变化

本文为高州水库轮虫调查(1988)的第三部分。各水层轮虫数量的季节变化是:上层(5米以上水层),春季占82.5％,夏季占67％,冬季占65.2％,秋季由于轮虫种群向中层(10至15米)迁移,只占46.5％;下层(20至30米)各季节轮虫数量一般少于8％。除7、8月份外,它们的最大密度都在2-4米水层。轮虫垂直变化的特点主要是由占轮虫总量83％的8种优势轮虫所形成。文中还讨论了水温、水深、风和其他因素对轮虫垂直分布的巨大影响。

THE SEASONAL CHANGES IN VERTICAL DISTRIBUTION OF ROTATORIA IN GAOZHOU RESERVOIR(1988)

This paper is the third part of Rotatorian survey in Gaozhou Reservoir(1988) The seasonal changes of the percentage of the total sum of Rotatoria in each water layer are as follows: in the upper layer(from water face to 5 meters), 82.5% in spring, 67% in summer, 65.2% in winter and 46.5% in autumn because of the migration of the Rotatoria to the middle layer (from 10 to 15 meters), at the same time usually less than 8% in lower layer (from 20 to 30 meters) on each season. The maxima of the population density are always between 2 and 4 depth in meters except July and August. The character in vertical distribution of Rotatoria is formed by the eight dominant Rotatoria which accounts tor 83.8 percent of tatol sum of Rotatoria. In this paper, we also discuss the effect of water temperature, depth, wind and other factors on the distribution of Rotatoria.