Reassessing the costs of biological invasion: Mnemiopsis leidyi in the Black sea |
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| Institution: | 1. UPV-EHU, Faculty of Science and Technology, Dept. Plant Biology and Ecology, POB 644, 48080 Bilbao, Spain;2. UPV-EHU, Faculty of Pharmacy, Dept. Plant Biology and Ecology, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain;3. Institut de Ciències del Mar (CSIC), Passeig Marítim 37-49, 08003 Barcelona, Spain;4. Joint Research Centre of the European Commission, Institute for Environment and Sustainability, Water Resources Unit, Via E. Fermi 2749, TP 440, 21027 Ispra (VA), Italy;1. National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan;2. Department of Polar Science, The Graduate University for Advanced Studies (SOKENDAI), 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan;3. Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577, Japan;4. Graduate School of Biosphere Science, Hiroshima University, 4-4 Kagamiyama 1 Chome, Higashi-Hiroshima 739-8528, Japan;1. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, (OGS), Section of Oceanography, Via A. Piccard 54, 34151 Trieste, Italy;2. National Institute of Biology, Marine Biology Station Piran, Fornace 41, 6330 Piran, Slovenia;3. Gollasch Consulting (GoConsult), Grosse Brunnenstrasse 61, 22763 Hamburg, Germany;4. University of Dubrovnik, Institute for Marine and Coastal Research, Dubrovnik, Croatia;5. Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Via Vitaliano Brancati, 48, 00144 Roma, Italy;6. Vina Gorica 17, 8210 Trebnje, Slovenia;7. Dr.Matej David Consult d.o.o., Korte 13 e, 6310 Izola, Slovenia;1. Istituto Superiore per la Protezione e la Ricerca Ambientale – ISPRA, Via Vitaliano Brancati 48, 00144 Rome, Italy;2. University of Rijeka, Faculty of Maritime Studies, Studentska 2, 51000 Rijeka, Croatia;3. Ministry of the Sea, Transport and Infrastructure, Prisavlje 14, 10 000 Zagreb, Croatia;4. Maritime Safety Department, Marsala Tita 7, 85 000 Bar, Montenegro;5. GoConsult, Grosse Brunnenstrasse 61, 22763 Hamburg, Germany;6. Dr Matej David Consult, Korte 13e, 6310 Izola, Slovenia |
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| Abstract: | Invasions of ecosystems by exotic species have been the focus of a growing body of research in applied biology and ecology, but relatively little attention has been paid to their economic consequences. Even where economic estimates have been made these often make ad hoc assumptions about the biological relationships of interest and lack grounding in economic theory. This paper develops an integrated ecological-economic approach to assess the economic consequences of invasion for a commercially harvested endemic species whose population dynamics are altered by the invader. As a case study, the Black Sea anchovy fishery represents an interesting example of such a situation. In the early 1980s, the comb jelly Mnemiopsis leidyi invaded the Black Sea, eventually becoming established and experiencing a population explosion with dire consequences for the commercial anchovy fishery. In modeling the population dynamics of the Black Sea anchovy (Engraulis encrasicolus), the influence of Mnemiopsis is incorporated as a structural change in the anchovy stock-recruitment relationship. Then the economic loss associated with this structural change is assessed, using a discrete, dynamic bioeconomic model. It is shown that Mnemiopsis had a dramatic effect on the potential sustainable harvest from an optimally managed anchovy fishery but these losses were at least an order of magnitude lower than estimates cited elsewhere. |
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