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Regime shift dynamics, tipping points and the success of fisheries management
Blöcker, A.M.; Gutte, H.M.; Bender, R.L.; Otto, S.A.; Sguotti, C.; Möllmann, C. (2023). Regime shift dynamics, tipping points and the success of fisheries management. NPG Scientific Reports 13(1): 289. https://dx.doi.org/10.1038/s41598-022-27104-y
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
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| Auteurs | | Top |
- Blöcker, A.M.
- Gutte, H.M.
- Bender, R.L.
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- Otto, S.A.
- Sguotti, C.
- Möllmann, C.
|
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| Abstract |
Recovery of depleted fish stocks is an important goal for fisheries management and crucial to sustain important ecosystem functions as well as global food security. Successful recovery requires adjusting fishing mortality to stock productivity but can be prevented or inhibited by additional anthropogenic impacts such as climate change. Despite management measures to recover fish stocks being in place in legislations such as the European Union´s Common Fisheries Policy (CFP), recovery can be hindered by the occurrence of regime shift dynamics. Such non-linear discontinuous dynamics imply tipping points and bear the characteristics of abrupt change, hysteresis and non-stationary functional relationships. We here used the recent reform of the CFP as a natural experiment to investigate the existence of regime shift dynamics and its potential effects on the recovery potential on six strongly fished or even depleted commercial fish stocks in the North Sea. Using a set of statistical approaches we show that regime shift dynamics exist in all six fish stocks as a response to changes in fishing pressure and temperature. Our results furthermore demonstrate the context-dependence of such dynamics and hence the ability of management measures to rebuild depleted fish stocks, leading to either failed recovery or positive tipping. |
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