Conclusions

The results show that cost-benefit optimal solution for removal of Ulva has the highest eco-exergy and specific eco-exergy, followed by a significant removal of nutrients from the watershed. In the case of removal of Ulva, specific exergy continues to increase as the number of vessels operating in the lagoon increase. The present situation had the lowest eco-exergy and specific eco-exergy. The result shows that it is a good sustainability policy to take care of natural resources, in this case the clams.

Eco-exergy expresses the system biomass and genetic information embedded in that biomass, while specific eco-exergy tells us how rich in information the system is. These indicators broadly encompass ecosystem characteristics and it has been shown that they are correlated with several important parameters such as respiration, biomass, etc. However it has been pointed out (Jorgensen, 2000b) that eco-exergy is not related to biodiversity, and for example, a very eutrophic system often has a low biodiversity but high eco-exergy.

When a manager has to select between different alternatives, it is difficult to evaluate the optimal solution from an ecological point of view. As eco-exergy and specific exergy are global parameters of the ecosystem, they give an idea of benefits that a measure will produce.

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