Economic repercussions of fisheries-induced evolution
Open Access
- 8 July 2013
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 110 (30), 12259-12264
- https://doi.org/10.1073/pnas.1212593110
Abstract
Fish stocks experiencing high fishing mortality show a tendency to mature earlier and at a smaller size, which may have a genetic component and therefore long-lasting economic and biological effects. To date, the economic effects of such ecoevolutionary dynamics have not been empirically investigated. Using 70 y of data, we develop a bioeconomic model for Northeast Arctic cod to compare the economic yield in a model in which life-history traits can vary only through phenotypic plasticity with a model in which, in addition, genetic changes can occur. We find that evolutionary changes toward faster growth and earlier maturation occur consistently even if a stock is optimally managed. However, if a stock is managed optimally, the evolutionary changes actually increase economic yield because faster growth and earlier maturation raise the stock’s productivity. The optimal fishing mortality is almost identical for the evolutionary and nonevolutionary model and substantially lower than what it has been historically. Therefore, the costs of ignoring evolution under optimal management regimes are negligible. However, if fishing mortality is as high as it has been historically, evolutionary changes may result in economic losses, but only if the fishery is selecting for medium-sized individuals. Because evolution facilitates growth, the fish are younger and still immature when they are susceptible to getting caught, which outweighs the increase in productivity due to fish spawning at an earlier age.This publication has 31 references indexed in Scilit:
- Reconsidering the Consequences of Selective FisheriesScience, 2012
- Towards the Optimal Management of the Northeast Arctic Cod FisherySSRN Electronic Journal, 2011
- Fishing-induced evolution and changing reproductive ecology of fish: the evolution of steepnessCanadian Journal of Fisheries and Aquatic Sciences, 2010
- Spare the Young Fish: Optimal Harvesting Policies for North-East Arctic CodEnvironmental and Resource Economics, 2010
- ORIGINAL ARTICLE: Avoidance of fisheries‐induced evolution: management implications for catch selectivity and limit reference pointsEvolutionary Applications, 2009
- Expected rate of fisheries-induced evolution is slowProceedings of the National Academy of Sciences of the United States of America, 2009
- Reversal of evolutionary downsizing caused by selective harvest of large fishProceedings. Biological sciences, 2009
- Deriving condition indices from standard fisheries databases and evaluating their sensitivity to variation in stored energy reservesCanadian Journal of Fisheries and Aquatic Sciences, 2004
- Studying spatial and trophic interactions between capelin and cod using individual-based modellingICES Journal of Marine Science, 2004
- Super-individuals a simple solution for modelling large populations on an individual basisEcological Modelling, 1995