By evaluating the role of a species in an ecosystem such as its position within the network of species in the community/ecosystem and thus the stability that it provides to the community, we could evaluate the importance of that species. The loss of some species on the periphery of the food web might have a much lower impact than central species that are interconnected with large numbers of other species. This still makes it bloody hard to put a £ value on a species but at least they species could be ranked in order of importance within the ecosystem. Then again maybe not?
diversity
conservation
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