This paper considers the connection between the diversity of catch in a multi-species fishery and the productivity of the fishery under different access regimes. A modified Gordon–Schaefer model is used to analyse the ...

A new measure of fish biodiversity that captures not only the species’ number and abundance, but also its economic value is introduced. The measure is formulated by weighting the Simpson’s index with price. Its application ...

Orchids are mostly known for their beautiful flowers, and food-flavoring products which make them a resource of great economic importance in the global horticultural and food industries. But in the Southern African region, ...