Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results

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dc.contributor.authorRoss-Gillespie, Andrea
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2016-03-16T09:11:03Z
dc.date.available2016-03-16T09:11:03Z
dc.date.issued2013
dc.date.updated2016-03-16T08:49:19Z
dc.description.abstractHake cannibalism and inter-species predation is modelled explicitly using a Type II functional response. Because of the fast dynamics of predation compared to other processes, the standard hake assessment model is converted from a yearly to a monthly time-step. Convergence of model fits is difficult to achieve both because of providing good estimates for starting values and of the tendency of the model towards oscillating behaviour. Thus far satisfactory fits have been obtained only from a somewhat reduced level of predation compared to that thought to occur. These results suggest that both hake species are at higher levels relative to pristine than for the standard assessment.en_ZA
dc.identifier.apacitationRoss-Gillespie, A., & Butterworth, D. S. (2013). <i>Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/17838en_ZA
dc.identifier.chicagocitationRoss-Gillespie, Andrea, and Doug S Butterworth <i>Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2013. http://hdl.handle.net/11427/17838en_ZA
dc.identifier.citationRoss-Gillespie, A. & Butterworth, D.S. (2013). Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results. International Stock Assessment Workshop document: MARAM IWS/DEC13/Ecofish/P10en_ZA
dc.identifier.ris TY - Working Paper AU - Ross-Gillespie, Andrea AU - Butterworth, Doug S AB - Hake cannibalism and inter-species predation is modelled explicitly using a Type II functional response. Because of the fast dynamics of predation compared to other processes, the standard hake assessment model is converted from a yearly to a monthly time-step. Convergence of model fits is difficult to achieve both because of providing good estimates for starting values and of the tendency of the model towards oscillating behaviour. Thus far satisfactory fits have been obtained only from a somewhat reduced level of predation compared to that thought to occur. These results suggest that both hake species are at higher levels relative to pristine than for the standard assessment. DA - 2013 DB - OpenUCT DP - University of Cape Town KW - cannibalism KW - inter-species KW - predation KW - hake LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results TI - Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results UR - http://hdl.handle.net/11427/17838 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17838
dc.identifier.vancouvercitationRoss-Gillespie A, Butterworth DS. Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results. 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17838en_ZA
dc.languageengen_ZA
dc.publisher.departmentMarine Resource Assessment and Management Groupen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subjectcannibalism
dc.subjectinter-species
dc.subjectpredation
dc.subjecthake
dc.titleIncorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary resultsen_ZA
dc.typeWorking Paperen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceResearch paperen_ZA
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