Ing-Marie Gren
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Enforcement of environmental regulations: inspection costs in Sweden
Ing-Marie Gren , Chuan-Zhong Li -
Economic effects of carbon sink management for the EU climate policy
Ing-Marie Gren , Katarina Elofsson -
Cost-effective nutrient and green-house gas management in the Baltic Sea region
Ing-Marie Gren , Sarah Säll -
Habitat quality and fish populations: impacts of nutrient enrichment on the value of European perch off the east coast of Sweden
Wondmagegn Tafesse Tirkaso , Ing-Marie Gren doi: http://dx.doi.org/10.21511/ee.08(1).2017.05Environmental Economics Volume 8, 2017 Issue #1 pp. 46-56
Views: 1741 Downloads: 494 TO CITE АНОТАЦІЯDegradation of marine ecosystems through, e.g., eutrophication and climate change is a concern for sustainable fishery management worldwide, but studies on associated impacts on fish populations are rare. This study examines the effects of eutrophying nutrient loads on the economic value of perch populations along the Swedish east coast by estimating the effects of nutrient loads on the population of perch and, then, simulates the harvest value of future perch population under the changes in nutrient loads. A modified Gordon-Schaefer logistic growth model was used for econometric estimation of perch populations based on annual time series data for the period of 1970-2014. Regression analysis using the fully modified ordinary least square (FMOLS) estimator revealed that phosphorus loads had significant effects on the perch population. A 40% decrease in phosphorus loads, as suggested by the international HELCOM agreement, could increase the steady state perch population by 50%. Simple calculations showed that this could increase the total discounted recreational and commercial harvest value of the perch by 30% over a 30 year period.
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