Modeling the role and impact of alien species and fisheries on the Israeli marine continental shelf ecosystem
Corrales, X.; Ofir, E.; Coll, M.; Goren, M.; Edelist, D.; Heymans, J.J.; Gal, G. (2017). Modeling the role and impact of alien species and fisheries on the Israeli marine continental shelf ecosystem. J. Mar. Syst. 170: 88-102. https://dx.doi.org/10.1016/j.jmarsys.2017.02.004
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, more
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| Keyword |
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| Author keywords |
Eastern Mediterranean Sea; Food web; Ecopath model; Alien species; Fishing |
| Authors | | Top |
- Corrales, X.
- Ofir, E.
- Coll, M.
- Goren, M.
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- Edelist, D.
- Heymans, J.J., more
- Gal, G.
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| Abstract |
The ecosystems of the Israeli Mediterranean coast have undergone significant changes in recent decades mainly due to species invasions and fishing. In order to characterize the structure and functioning of the marine continental shelf of the Israeli Mediterranean coast and assess temporal changes, we developed a food web model representing two time periods: 1990–1994 and 2008–2012.The 1990–1994 and 2008–2012 food web models were composed of 39 and 41 functional groups, respectively. Functional groups ranged from primary producers to top predators, and included six and eight alien functional groups, respectively, encompassing several crustacean and fish species. Input data included local surveys and fishery statistics, published data on stomach content analyses, and the application of empirical equations to estimate consumption and production rates.Results of the competitive interactions between alien and native species and changes in trophic flows between food web components highlight the increasing impact of alien species over time. Fishing had noticeable impacts in both time periods and played an important role in the ecosystem. Despite different productivity rates and other environmental differences, the Israeli marine ecosystem shared common structural and functional traits with other Mediterranean marine ecosystems. This is the first attempt to study the ecosystem of the Levant region using mass-balance models and to integrate such a large amount of alien species into food web analyses. |
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