The longline CPUE series for the three outer islands are GLMM standardised through to 2010. Year, month, area, trap-type, soak time, depth and year-area interactions are treated as fixed effects, and year-month interactions treated as a random effect. For Tristan, for which the available powerboat data are more limited, a GLM with year and month as fixed effects is applied. After initial increase, the standardised CPUE indices show drops over the most recent years for all islands – although for Gough, this decrease is only seen in the most recent 2010 season’s data.
Reference:
Johnston, S. J., Brandao, A., & Butterworth, D. S. (2010). GLMM-and GLM-standardised lobster CPUE from the Tristan da Cunha group of islands for the 1997-2010 period. MARAM/Tristan/2012/Jun/07.
Johnston, S. J., Brandão, A., & Butterworth, D. S. (2012). GLMM- and GLM-standardised lobster CPUE from the Tristan da Cunha group of islands for the 1997-2010 period University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18655
Johnston, Susan J, Anabela Brandão, and Doug S Butterworth GLMM- and GLM-standardised lobster CPUE from the Tristan da Cunha group of islands for the 1997-2010 period. University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2012. http://hdl.handle.net/11427/18655
Johnston SJ, Brandão A, Butterworth DS. GLMM- and GLM-standardised lobster CPUE from the Tristan da Cunha group of islands for the 1997-2010 period. 2012 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18655
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