SEASONAL DYNAMICS OF ZOOPLANKTON FUNCTIONAL GROUPS IN RELATION TO ENVIRONMENTAL FACTORS IN GENHEYUAN WETLAND OF NORTHEAST CHINA

In order to study the seasonal changes of the freshwater zooplankton functional groups and the impact of water environment in cold temperate wetlands in China, nine sampling sites were selected in Genheyuan nature reserve in spatiotemporal of 2020. The results showed that we found seven functional groups, including protozoa filter feeders (PF), rotifer filter feeders (RF), rotifer carnivore (RC), small copepodas and cladocera filter feeders (SCF), middle copepodas and cladocera carnivore (MCC), large copepodas and cladocera carnivore (LCC) and large copepodas and cladocera filter feeders (LCF). In spring, the PF (54.32%) and RF (39.5%) functional groups were dominant. In summer, the PF was contributing 93.2%. In autumn, the PF (54.64%) and RF (44.62%) were dominant. The seasonal succession was characterzed by PF+RFPF+RF+RCPF+RF+MCC, which indicates that the filter feeding zooplankton usually dominates in three seasons, resulting in a long-term poor trophic state of the water. Pearson correlation analysis and redundancy analysis multivariate statistical analysis showed that the chemical oxygen demand, dissolved iron and pH were the mainly influencing fators. Our finding has certain reference significance for the freshwater wetlands management and protection in the cold temperate zone.