三北地区内陆盐水的浮游甲壳类

Planktonic Crustaceans of Inland Saline Watersin Sanbei District, Northern China

１９９０～１９９１年间在三北地区盐度０．５７～２１４ｇ／Ｌ的２８个内陆水体采集了浮游甲壳类水样．共检出４３种甲壳类，其中无甲类２种，枝角类２３种，桡足类１８种。根据出现率和平均密度，浮游甲壳类的主要种类有１２种，即无甲类：卤虫；枝角类：大型、蒙古裸腹、点滴尖额和矩形尖额；桡足类：细巧华哲水蚤、亚洲后镖水蚤、直刺北镖水蚤、近邻剑水蚤、短角异剑水蚤、扁平小剑水蚤和等刺温剑水蚤。结果表明，浮游甲壳类总种数随盐度增大而趋于下降，文中讨论了内陆盐水浮游甲壳类的种类组成、分布和盐度耐性以及种类多样性与盐度、碱度、ｐＨ、离子系数之间的关系等问题。

Collection of planktonic crustaceans were made from 28 inlandsaline water bodies in Sanbei District located in northern China ranging insalinity from 0. 57～ 214 g/L during 1990～1991.Crustaceans in 43 specieswere identified,2 species belong to Anostraca,23 species to Cladocera and 18species to Copepoda.According to the rate of occurrence and the average den-sity,the important species are Anostraca: Artemia sp.;Clandocera: Daphniamagna, Moina mongolica, Alona guttata and A. rectangula;Copepoda:Sinocalanus tenellus,Metadiaptomus asiuticus.Arctodiaptomus rectispinosus ,Cyclops vicinus,Apocyclops royi,Microcyclops uenoi and Thermocyclops kawa-murai. The results showed that the total number of species present a tenden-cy to dicline as salinity in crease. The species composition, distribution andsalinity tolerance of planktonic crustaceans from inland saline waters as wellas the relationships between salinity, alkalinity, PH, ratio of monovalent ofdivalent ions and species diversity were discussed.