Abstract
During May and June 1991, the biological and ecological features of sixteen aquatic localities in Zhanjiakou region, Hebei, northern China, were investigated. Their salinity ranged from 0.98 to 175.2 g L−1. Fish and benthic macroinvertebrates were depauperate. 116 samples were collected. 91 species (or genera) of phytoplankton and 94 species of zooplankton were recorded. In most of the saline lakes, Cl− and Na+ were dominant, and alkalinity and pH values were higher. For phytoplankton, major species were Chroococcus minutus, Oscillatoria tenuis [blue-green algae]; Chlamydomonas spp., Chlorococcus spp., Chlorella vulgaris, Crucigenia quadrata, Dunaliella salina, Kirchneriella contorta, Oocystis lacustris, Scenedesmus acuminatus [green algae] and Cyclotella meneghiniana, Navicula spp., Nitzschia spp. [diatoms]. Other phytoplankton taxa present included: Cryptomonas erosa, Chroomonas acuta, Chromulina pascheri, Euglena viridis. For zooplankton, major species included: Vorticella campanula, Epistylis breviramosa, Euplotes terricola [protozoa] Brachionus plicatilis, Hexarthra fennica, Keratella quadrata, Notholca acuminata quadrata [Rotifera] Daphnia magna, D.longispina [‘Cladocera’] Artemia spp. [Anostraca] Arctodiaptomus rectispinosus and Cyclops vicinus [Copepoda]. The species composition, distribution, salinity tolerance of planktonic forms in inland saline waters are discussed and their relationship with certain environmental factors.
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