Economic Impacts of Biological Invasion: Escaped Farmed vs. Native Species
Escaped farmed species is one type of biological invasions that have various potential ecological and economic effects on native species. The paper develops a general invasive species impact model explicitly capturing both ecological and economic effects of invasive species, especially farmed escape...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.6790 http://www.svt.ntnu.no/iso/anders.skonhoft/invasivesalmon0909.pdf |
| Summary: | Escaped farmed species is one type of biological invasions that have various potential ecological and economic effects on native species. The paper develops a general invasive species impact model explicitly capturing both ecological and economic effects of invasive species, especially farmed escapees, on native stock and harvesting. First, possible effects of escaped farmed species on the growth and stock of the native species are examined. Next, a bioeconomic model to analyze changes in yield, benefit distribution and overall profitability is constructed. Different harvesting cases such as commercial, recreational and joint commercial and recreational fishing are explored. The model is illustrated by a case study of the interaction between wild and farmed Atlantic salmon in Norway. The results suggest that the harvest and profitability of the native species decline after an invasion, but the total profit from the harvest of both the native and farmed stock may increase or decrease depending on the strength of the ecological and economic forces. |
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