Analysis of key functional group for Xiaoqinghe River ecosystem based on Ecopath
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Abstract:
Key functional group is of great significance to monitoring aquatic ecosystem health and protecting biodiversity. In this paper, we introduced the Ecopath model to quantitively analyze the structural composition and nutritional relationships in an aquatic ecosystem. After calculating the direction and amount of the substance and energy flow in the ecosystem, we determined the key species in the ecosystem and proposed a method to build the key functional group. The method was then applied to the Xiaoqinghe River Basin. Results showed that the members of the key functional group changed with the season: in spring, there were Oryzias latipes, Carassius auratus, Limnodrilus, Protozoa, and Cryptomonas; in summer, there were Oryzias latipes, Misgurnus anguillicaudatus (including Paramisgurnus dabryanus), Limnodrilus, Protozoa, and Tribonema sp.; in autumn, there were Misgurnus anguillicaudatus (including Paramisgurnus dabryanus), Hemiculter leucisculus, Exopalaemon modestus, Lepadella and Euglena. This approach can provide a simple way to select important species for aquatic ecosystem protection, and provide a basis for the wise management of water resources and construction of aquatic ecological civilization.
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