Conclusions

The emergy analysis reveals that the higher emergy flow in the subsidized marsh is caused by a higher input of nonrenewable energy sources. Community parameters (density and overall biomass) are also higher in the subsidized marsh, but at a cost of lowered richness, diversity, and evenness. Complexity of community structures is not influenced by the external subsidy. External subsidies increase the total emergy flow in an ecosystem and may increase the rate of successional processes in both the vegetative and wildlife communities.

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