- 期刊
Population Densities, Sex Ratios of Adults, and Occurrence of Malformations in Three Species of Cyclopoid Copepods in Waterbodies with Different Degrees of Eutrophy and Toxic Pollution
並列摘要
The population structure of three common cyclopoid copepods, Acanthocyclops robustus Sars, Cyclops vicinus Uljanin, and Thermocyclops crassus Fischer, inhabiting waterbodies with different degrees of eutrophy and levels of toxic pollution is examined in this paper. Degree of eutrophy was estimated using phosphorus concentration (total PO4-P), and the level of toxic pollution by the concentration of heavy metals. The following population characters were studied: density, sex ratio of adults, and the presence and frequency of morphological abnormalities. Dominance of Acanthocyclops robustus increased with increasing eutrophy. Cyclops vicinus formed summer generations in eutrophic waterbodies. Thermocyclops crassus is typical of mesotrophic waterbodies with phosphorus concentrations about 20-50μg l^(-1). A trend toward population masculinization appeared in Acanthocyclops robustus, and was positively correlated with the degree of eutrophy. The observed sex ratio in Cyclops vicinus varied widely from male dominance to female dominance. Females of Thermocyclops crassus dominated in almost all the waterbodies examined. Malformed specimens of Acanthocyclops robustus and Cyclops vicinus were found in waterbodies with heavy-metal concentrations above 15-20μg l^(-1).
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