胶州湾浮游桡足类时空分布

根据2003年1月至12月在胶州湾所获得的浮游生物样品,已鉴定浮游桡足类28种,幼虫、幼体6类.分析了该海区浮游桡足类的分布﹑时空变化及其与生态环境因子的关系,同相关历史资料进行了比较,结果表明,浮游桡足类的种类组成单纯,生态属性以暖温带、近岸低盐种类为主.浮游桡足类的丰度分布具明显的月份变化,高峰在7月份,为181.61个/m3,最低在12月份,为23.53个/m3,全年平均为71.42个/m3.浮游桡足类丰度的平面分布不均匀,最大丰度在5号站,为132.62个/m3,最小丰度在8号站,为40.45个/m3,丰度平面分布的变化趋势基本是湾北部海域大于湾南部海域.浮游桡足类丰度的时空分布,主要种类的季节更替,近20a来的变化趋势基本相同,高峰出现时间的差异,是受温度年季变化差异因素的影响.浮游桡足类丰度的时空分布与海水温度和盐度密切相关,与温度的关系更重要于与盐度的关系.并且用胶州湾的调察资料证实了浮游桡足类对浮游植物的依存关系,浮游植物为浮游桡足类的生长、繁衍提供了饵料.

Spatial-temporal distribution of planktonic copepod in the Jiaozhou Bay

Based on the planktons sampled in the Jiaozhou Bay during the time period from January to December 2003,totally 28 species of planktonic copepods and 6 species of the larva are identified. The spatial\|temporal distribution and variation of the species, and their relationships to the environmental factors of the sea area are analyzed. As it is shown by the results from the analysis and the comparison with the historical data, the species composition can be clearly simplified and mainly characterized by their ecological features of the typical species living in the low\|salinity water of the near\|shore sea in the warm temperate zone. The planktonic copepod abundance variates from month to month with its peak of 181.61 ind./m3 in July, the lowest of 23.53 ind./m3 in December, and the annual mean of 71.42 ind./m3.The planktonic copepod abundance is inhomogeneous in its horizontal distribution, with the densest of 132.62 ind./m3 at Station 5 and the sparsest of 40.45 ind./m3 at Station 8. In general, the abundance tends to be denser in the north of the sea area than in the south. The spatial\|temporal distribution of the dominant species and the seasonal variation of their abundances keep less changeable in the 20 years. Although the time for the peak abundance appearance is different from year to year, this difference depends upon the temperature seasonal or annual variation. In fact, the spatial\|temporal distribution of the planktonic copepod abundance are closely related to thermohaline distribution, even more closely to temperature than to salinity. Furthermore it is evidenced by means of the investigation data the Jiaozhou Bay that planktonic copepod population depends upon the phytoplankton abundance, and the latter provides food for the former growing and breeding.