Restoration Effect Evaluation of Fish Habitats in River Wetlands in Jilin Momoge National Nature Reserve
The wetlands are the habitats and the stopover sites of the waterfowls,the fishes in the wetlands are the important food basis of the waterfowls.Jilin Momoge National Nature Reserve is an important resting place for the migration of rare and endangered birds,such as Grus leucogeranus and Ciconia boyciana,it was included in the list of international important wetlands in 2013.In recent years,the suitability of the fish habitat in this area has weakened,the proliferation capacity of fish resources has declined,and the suitability of wetlands as waterfowl habitats and stopover sites has decreased.In order to increase the fish resources in the wetlands and improve the suitability of the wetlands as waterfowl habitat and stopover site,from 2016 to 2017,the natural habitats of fish in the shallow water area near shore and floodplain area of Nenjiang River were repaired by the method of wetland hydrology and substrate restoration.Before and after the restoration of fish habitats,fish samples were collected and investigated in September 2015 and November 2017 to September 2021,respectively.The composition and structural characteristics of fish communities before and after the restoration of fish habitats were studied,and the restoration effect of fish habitat was evaluated.The results showed that compared with the natural habitats of fish,the number of fish species in the restored habitat increased significantly,while the relative population biomass and relative population number of economic fish decreased by 16.02％and 39.98％,respectively.The relative population biomass and relative population number of small non-economic fish increased by 1.43 times and 63.54％,respectively,compared with the original habitat.The existing resources of fish,the average annual fish resources and the average annual fish distribution density increased significantly.The values of Simpson diversity index and Pielou evenness index of the fish community in the restored habitat were 31.98％and 34.42％lower than those in the natural habitat,respectively.The wetland hydrology and substrate restoration methods adopted by improved the suitability of the restored habitat for fish,promoted the natural proliferation of fish resources and the self-development of the population,and realized the sustainability of the functions of the shallow water area near shore and the floodplain area of the Nenjiang River as the habitats and migration stopover sites of waterfowls,which made up for the defects of poor suitability of the natural habitats,low natural proliferation ability of fish and unsustainable population development.This restoration method could provide reference for the restoration of fish habitats in the nature reserves for the wetlands in Songnen Plain.
fish habitatrestorationriver wetlandsJilin Momoge National Nature Reserve
NETL
NSTL
万方数据
