The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey
| dc.contributor.author | Plagányi, Éva E | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-03-14T11:46:15Z | |
| dc.date.available | 2016-03-14T11:46:15Z | |
| dc.date.issued | 2012 | |
| dc.date.updated | 2016-03-09T13:13:17Z | |
| dc.description.abstract | The nature and impact of fishing on predators that share a fished resource is an important consideration in ecosystem-based fisheries management. Krill (Euphausia superba) is a keystone species in the Antarctic, serving as a fundamental forage source for predators and simultaneously being subject to fishing. We developed a spatial multispecies operating model (SMOM) of krill–predator fishery dynamics to help advise on allocation of the total krill catch among 15 small-scale management units (SSMUs) in the Scotia Sea, with a goal to reduce the potential impact of fishing on krill predators. The operating model describes the underlying population dynamics and is used in simulations to compare different management options for adjusting fishing activities (e.g., a different spatial distribution of catches). The numerous uncertainties regarding the choice of parameter values pose a major impediment to constructing reliable ecosystem models. The pragmatic solution proposed here involves the use of operating models that are composed of alternative combinations of parameters that essentially try to bound the uncertainty in, for example, the choice of survival rate estimates as well as the functional relationships between predators and prey. Despite the large uncertainties, it is possible to discriminate the ecosystem impacts of different spatial fishing allocations. The spatial structure of the model is fundamental to addressing concerns of localized depletion of prey in the vicinity of land-based predator breeding colonies. Results of the model have been considered in recent management deliberations for spatial allocations of krill catches in the Scotia Sea and their associated impacts on dependent predator species. | en_ZA |
| dc.identifier | http://dx.doi.org/10.1890/11-0441.1 | |
| dc.identifier.apacitation | Plagányi, É. E., & Butterworth, D. S. (2012). The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey. <i>Ecological Applications</i>, http://hdl.handle.net/11427/17770 | en_ZA |
| dc.identifier.chicagocitation | Plagányi, Éva E, and Doug S Butterworth "The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey." <i>Ecological Applications</i> (2012) http://hdl.handle.net/11427/17770 | en_ZA |
| dc.identifier.citation | Plagányi, É. E., & Butterworth, D. S. (2012). The Scotia Sea krill fishery and its possible impacts on dependent predators: modeling localized depletion of prey. Ecological Applications, 22(3), 748-761. | en_ZA |
| dc.identifier.issn | 1051-0761 | en_ZA |
| dc.identifier.ris | TY - Journal Article AU - Plagányi, Éva E AU - Butterworth, Doug S AB - The nature and impact of fishing on predators that share a fished resource is an important consideration in ecosystem-based fisheries management. Krill (Euphausia superba) is a keystone species in the Antarctic, serving as a fundamental forage source for predators and simultaneously being subject to fishing. We developed a spatial multispecies operating model (SMOM) of krill–predator fishery dynamics to help advise on allocation of the total krill catch among 15 small-scale management units (SSMUs) in the Scotia Sea, with a goal to reduce the potential impact of fishing on krill predators. The operating model describes the underlying population dynamics and is used in simulations to compare different management options for adjusting fishing activities (e.g., a different spatial distribution of catches). The numerous uncertainties regarding the choice of parameter values pose a major impediment to constructing reliable ecosystem models. The pragmatic solution proposed here involves the use of operating models that are composed of alternative combinations of parameters that essentially try to bound the uncertainty in, for example, the choice of survival rate estimates as well as the functional relationships between predators and prey. Despite the large uncertainties, it is possible to discriminate the ecosystem impacts of different spatial fishing allocations. The spatial structure of the model is fundamental to addressing concerns of localized depletion of prey in the vicinity of land-based predator breeding colonies. Results of the model have been considered in recent management deliberations for spatial allocations of krill catches in the Scotia Sea and their associated impacts on dependent predator species. DA - 2012 DB - OpenUCT DP - University of Cape Town J1 - Ecological Applications LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 SM - 1051-0761 T1 - The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey TI - The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey UR - http://hdl.handle.net/11427/17770 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/17770 | |
| dc.identifier.uri | http://onlinelibrary.wiley.com/doi/10.1890/11-0441.1/full | |
| dc.identifier.vancouvercitation | Plagányi ÉE, Butterworth DS. The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey. Ecological Applications. 2012; http://hdl.handle.net/11427/17770. | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher | Ecological Society of America | en_ZA |
| dc.publisher.department | Marine Resource Assessment and Management Group | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.source | Ecological Applications | en_ZA |
| dc.source.uri | http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1939-5582 | |
| dc.title | The Scotia Sea krill fishery and its possible impacts on dependent predators:modelling localized depletion of prey | en_ZA |
| dc.type | Journal Article | en_ZA |
| uct.subject.keywords | Antarctic; ecosystem model; krill; localized depletion; multispecies model; operating model; predator—prey; uncertainty | en_ZA |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Article | en_ZA |