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Varying demographic impacts of different fisheries on three Mediterranean seabird species.
Copyright policy ) Meritxell Genovart; Daniel F. Doak; José Manuel Igual; Stefano Sponza; Jelena Kralj; Daniel Oro;
Meritxell Genovart; Daniel F. Doak; José Manuel Igual; Stefano Sponza; Jelena Kralj; Daniel Oro;
Varying demographic impacts of different fisheries on three Mediterranean seabird species.
Fisheries have an enormous economic importance, but reconciling their socio-economic features with the conservation and sustainability of marine ecosystems presents major challenges. Bycatch mortality from fisheries is clearly among the most serious global threats for marine ecosystems, affecting a wide range of top predators. Recent estimates report ca. 200,000 seabirds killed annually by bycatch in European waters. However, there is an urgent need to rigorously estimate actual mortality rates and quantify effects of bycatch on populations. The Mediterranean Sea is one of the most impacted regions. Here, we estimate for the first time both bycatch mortality rates and their population-level effects on three endemic and vulnerable Mediterranean taxa: Scopoli’s shearwater, Mediterranean shag, and Audouin’s gull, that die in different types of fishing gears: longlines, gillnets and sport trolling, respectively. We use multi-event capture–recapture modelling to estimate crucial demographic parameters, including the probabilities of dying in different fishing gears. We then build stochastic demography models to forecast the viability of the populations under different management scenarios. Longline bycatch was particularly severe for adults of Scopoli’s shearwaters and Audouin’s gulls (ca. 28% and 23% of total mortality, respectively) and also for immature gulls (ca. 90% of mortality). Gillnets had a lower impact, but were still responsible for ca. 9% of juvenile mortality on shags, whereas sport trolling only slightly influenced total mortality in gulls. Bycatch mortality has high population-level impacts in all three species, with shearwaters having the highest extinction risk under current mortality rates. Different life-history traits and compensatory demographic mechanisms between the three species are probably influencing the different bycatch impact: for shearwaters, urgent conservation actions are required to ensure the viability of their populations. Results will be very useful for guiding future seabird conservation policies and moving towards an ecosystem-based approach to sustainable fisheries management.
Regional Government of the Balearic Islands; European Social Fund; Spanish Ministry of Economy, Grant/Award Number: CGL2013-42203-R; European Union, Grant/Award Number: H2020- 634495
Este artículo contiene 18 páginas, 7 figuras, 8 tablas.
Peer reviewed
Croatia, Spain
- University of Colorado Boulder United States
- Spanish National Research Council Spain
- University of Trieste Italy
Microsoft Academic Graph classification: Bycatch Range (biology) Shearwater biology.organism_classification biology Fishery Ecology Marine ecosystem Fishing Seabird biology.animal Apex predator Fisheries management
Animals, Charadriiformes, Conservation of Natural Resources, Demography, Ecosystem, Fisheries, Mediterranean Sea, Population Dynamics, Stochasticity, Survival, Bycatch, Conservation, Marine predators, Multi-event capture–recapture, Parameter uncertainty, Population models, PVA, Seabirds, bycatch ; conservation ; marine predators ; multi-event capture–recapture ; parameter uncertainty ; population models ; PVA ; seabirds ; stochasticity ; survival, General Environmental Science, Ecology, Environmental Chemistry, Global and Planetary Change, Stochasticity, Survival, Bycatch, Conservation, Marine predators, Multi-event capture–recapture, Parameter uncertainty, Population models, PVA, Seabirds
Animals, Charadriiformes, Conservation of Natural Resources, Demography, Ecosystem, Fisheries, Mediterranean Sea, Population Dynamics, Stochasticity, Survival, Bycatch, Conservation, Marine predators, Multi-event capture–recapture, Parameter uncertainty, Population models, PVA, Seabirds, bycatch ; conservation ; marine predators ; multi-event capture–recapture ; parameter uncertainty ; population models ; PVA ; seabirds ; stochasticity ; survival, General Environmental Science, Ecology, Environmental Chemistry, Global and Planetary Change, Stochasticity, Survival, Bycatch, Conservation, Marine predators, Multi-event capture–recapture, Parameter uncertainty, Population models, PVA, Seabirds
Microsoft Academic Graph classification: Bycatch Range (biology) Shearwater biology.organism_classification biology Fishery Ecology Marine ecosystem Fishing Seabird biology.animal Apex predator Fisheries management
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).22 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average views 22 downloads 69 citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).22 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average - 22views69downloads
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This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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- University of Colorado Boulder United States
- Spanish National Research Council Spain
- University of Trieste Italy
Fisheries have an enormous economic importance, but reconciling their socio-economic features with the conservation and sustainability of marine ecosystems presents major challenges. Bycatch mortality from fisheries is clearly among the most serious global threats for marine ecosystems, affecting a wide range of top predators. Recent estimates report ca. 200,000 seabirds killed annually by bycatch in European waters. However, there is an urgent need to rigorously estimate actual mortality rates and quantify effects of bycatch on populations. The Mediterranean Sea is one of the most impacted regions. Here, we estimate for the first time both bycatch mortality rates and their population-level effects on three endemic and vulnerable Mediterranean taxa: Scopoli’s shearwater, Mediterranean shag, and Audouin’s gull, that die in different types of fishing gears: longlines, gillnets and sport trolling, respectively. We use multi-event capture–recapture modelling to estimate crucial demographic parameters, including the probabilities of dying in different fishing gears. We then build stochastic demography models to forecast the viability of the populations under different management scenarios. Longline bycatch was particularly severe for adults of Scopoli’s shearwaters and Audouin’s gulls (ca. 28% and 23% of total mortality, respectively) and also for immature gulls (ca. 90% of mortality). Gillnets had a lower impact, but were still responsible for ca. 9% of juvenile mortality on shags, whereas sport trolling only slightly influenced total mortality in gulls. Bycatch mortality has high population-level impacts in all three species, with shearwaters having the highest extinction risk under current mortality rates. Different life-history traits and compensatory demographic mechanisms between the three species are probably influencing the different bycatch impact: for shearwaters, urgent conservation actions are required to ensure the viability of their populations. Results will be very useful for guiding future seabird conservation policies and moving towards an ecosystem-based approach to sustainable fisheries management.
Regional Government of the Balearic Islands; European Social Fund; Spanish Ministry of Economy, Grant/Award Number: CGL2013-42203-R; European Union, Grant/Award Number: H2020- 634495
Este artículo contiene 18 páginas, 7 figuras, 8 tablas.
Peer reviewed
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