Updated GLMM results for the south coast penguin colony foraging data

• Main Authors: Ross-Gillespie, Andrea, Butterworth, Doug S
• Format: Report
• Language: unknown
• Published: Faculty of Science 2019
• Subjects: Bird Island
• Online Access: http://hdl.handle.net/11427/32396; https://open.uct.ac.za/bitstream/11427/32396/1/FISHERIES_2019_NOV_SWG-PEL_27rev%202019%20updated%20SC%20penguin%20analysis.pdf

The GLMM model to estimate the impact of fishing on penguins at the St Croix and Bird Island colonies is updated given further data. For trip length and duration data, there is no evidence to suggest a statistically significant impact of fishery on the penguin populations on these two islands, unless the influential 2016 data points are excluded from the analyses, in which case a significant impact would be indicated for the St Croix forage trip length variable. However, no a priori independent reason to treat 2016 data differently has been put forward to justify such an exclusion. If the maximum distance from the colony is considered, a significant (at the 5% level) negative impact of the fishery is indicated for St Croix.