Sustainable Yields

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Sustainable yields is a key part of sustainable management of ecosystems. It represents the 'safe' level of harvest that can be hunted/caught/utilised without harming the environment.

Maximum sustainable yield - the greatest harvest that can be taken indefinitely while leaving the ecosystem intact

Optimum sustainable yield - the best compromise achievabl

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Sustainable Yield Management in southern ocean fisheries:

Antarctic Treaty System

Single species approach - sets limits for harvesting individual species that are indefinitely sustainable

Ecosystem approach - involves considering harvested species both on their own and in relation to dependent species and the whole environment

Precautionary principle aims to model the consequences of any planned expansion of catches before it is permitted

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CAMPFIRE Zimbabwe:

Communal Areas Management Programme for Indigenous Resources was a scheme aimed at the long term development, management and sustainable use of natural resources in each communal area. This was achieved by placing responsibility with local people and allowing communities to benefit directly from exploitation of the available resources e.g. wildlife. Schemes made money from big game hunting at sustainable yield levels an the money was fed back into the community (controlled killing)