Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017

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dc.contributor.authorBrandão, Anabela
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2019-06-20T10:17:31Z
dc.date.available2019-06-20T10:17:31Z
dc.date.issued2018-08
dc.description.abstractGLM methods are applied to the “new” compliance database in which policing effort is linked to confiscations taken as well as to the “old” compliance database on confiscations (and abandonments) and on policing effort (but restricting the analyses to policing effort types that are common with the “new” database) to estimate recent trends in the amount of rock lobster that is poached. GLM methods are also applied to this “old” database, but estimates of relative effort efficiencies for different effort types obtained from the “new” database (and adjusted to account for inspections with zero confiscations which are not recorded in the “new” database) are used to link effort to the number of confiscations to provide a refined “old”-linked time series for the level of poaching. Because the number of data in the “new” database is so much less (only some 0.5%) than in the “old” database, it is recommended that the “new” database analyses be used only to provide estimates of relative efficiency of different effort types, and that the “old”-linked series serve as the basis for the assumptions concerning poaching needed for future assessments. These series suggest generally higher levels of poaching subsequent to 2008/9 than did earlier analyses.en_US
dc.identifier.apacitationBrandão, A., & Butterworth, D. (2018). <i>Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/30232en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug Butterworth <i>Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2018. http://hdl.handle.net/11427/30232en_ZA
dc.identifier.citationBrandão, A., Butterworth, D. 2018-08. Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017.en_ZA
dc.identifier.ris TY - Report AU - Brandão, Anabela AU - Butterworth, Doug AB - GLM methods are applied to the “new” compliance database in which policing effort is linked to confiscations taken as well as to the “old” compliance database on confiscations (and abandonments) and on policing effort (but restricting the analyses to policing effort types that are common with the “new” database) to estimate recent trends in the amount of rock lobster that is poached. GLM methods are also applied to this “old” database, but estimates of relative effort efficiencies for different effort types obtained from the “new” database (and adjusted to account for inspections with zero confiscations which are not recorded in the “new” database) are used to link effort to the number of confiscations to provide a refined “old”-linked time series for the level of poaching. Because the number of data in the “new” database is so much less (only some 0.5%) than in the “old” database, it is recommended that the “new” database analyses be used only to provide estimates of relative efficiency of different effort types, and that the “old”-linked series serve as the basis for the assumptions concerning poaching needed for future assessments. These series suggest generally higher levels of poaching subsequent to 2008/9 than did earlier analyses. DA - 2018-08 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2018 T1 - Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017 TI - Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017 UR - http://hdl.handle.net/11427/30232 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/30232
dc.identifier.vancouvercitationBrandão A, Butterworth D. Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017. 2018 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/30232en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleRefined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017en_US
dc.typeReporten_US
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