Fishermen, markets, and population diversity

摘要: Fishing impacts biodiversity on multiple levels, potentially resulting in unintended feedbacks to the economic performance of fishery over time. For example, targeting observable traits within a population can impact genetic diversity and valuable species at ecosystem level. The bioeconomic literature, however, has given little attention effect fishing diversity, even though contributes services estimates extinction rates are three orders magnitude higher than rates. Here we develop stochastic model that links harvest salmon populations single commercial trajectory stock complex. We parameterize our with biological data from Copper River Chinook fishery. show markets incentivize degradation reducing infra-marginal rents, increasing variability returns. also second-best management conserve improve welfare. Furthermore, depending fishermen׳s time preferences, this strategy is self-financing.