A summary of results for the island closure experiment

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dc.contributor.authorButterworth, Doug
dc.contributor.authorRoss-Gillespie, Andrea
dc.date.accessioned2021-07-29T13:57:17Z
dc.date.available2021-07-29T13:57:17Z
dc.date.issued2021
dc.description.abstractA simple summary is offered of the results of the island closure experiment reported in Ross-Gillespie and Butterworth (2021), which implemented the suggestions of the December 2020 International Panel. A single result in selected for each island/response variable combination, and reasons are provided for preferring the aggregated data approach for this, with increases made to the CI estimates so as to correspond to the unbiased REML method. Integration across the results is problematic for various reasons, but a coarse summary indicates little evidence for any impact (in either direction) of fishing in the neighbourhood of island colonies on penguin population growth rates. Given that the islands in the experiment have been closed for 50% of the period since 2008, some coarse predictions for the extent of improvement in annual population growth rates (on average over time) were these islands to be closed to fishing every year in the future are: Dassen -0.5% (i.e. no improvement), Robben +0.25%, Bird 0% and St Croix +0.5%.en_US
dc.identifier.apacitationButterworth, D., & Ross-Gillespie, A. (2021). <i>A summary of results for the island closure experiment</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/33664en_ZA
dc.identifier.chicagocitationButterworth, Doug, and Andrea Ross-Gillespie <i>A summary of results for the island closure experiment.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2021. http://hdl.handle.net/11427/33664en_ZA
dc.identifier.citationButterworth, D. & Ross-Gillespie, A. 2021. <i>A summary of results for the island closure experiment</i>. ,Faculty of Science ,Department of Mathematics and Applied Mathematics. http://hdl.handle.net/11427/33664 .en_ZA
dc.identifier.ris TY - Report AU - Butterworth, Doug AU - Ross-Gillespie, Andrea AB - A simple summary is offered of the results of the island closure experiment reported in Ross-Gillespie and Butterworth (2021), which implemented the suggestions of the December 2020 International Panel. A single result in selected for each island/response variable combination, and reasons are provided for preferring the aggregated data approach for this, with increases made to the CI estimates so as to correspond to the unbiased REML method. Integration across the results is problematic for various reasons, but a coarse summary indicates little evidence for any impact (in either direction) of fishing in the neighbourhood of island colonies on penguin population growth rates. Given that the islands in the experiment have been closed for 50% of the period since 2008, some coarse predictions for the extent of improvement in annual population growth rates (on average over time) were these islands to be closed to fishing every year in the future are: Dassen -0.5% (i.e. no improvement), Robben +0.25%, Bird 0% and St Croix +0.5%. DA - 2021 DB - OpenUCT DP - University of Cape Town KW - penguin KW - island closure KW - fishing impact KW - REML LK - https://open.uct.ac.za PY - 2021 T1 - A summary of results for the island closure experiment TI - A summary of results for the island closure experiment UR - http://hdl.handle.net/11427/33664 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/33664
dc.identifier.vancouvercitationButterworth D, Ross-Gillespie A. A summary of results for the island closure experiment. 2021 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/33664en_ZA
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.subjectpenguin
dc.subjectisland closure
dc.subjectfishing impact
dc.subjectREML
dc.titleA summary of results for the island closure experimenten_US
dc.typeReporten_US
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