Browsing by Author "Ross-Gillespie, A"

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    Report of the Sub-Committee on Other Southern Hemisphere Whale Stocks
    (2014-05-24) Ross-Gillespie, A
    SC/65b/SH12rev provided an overview of Southern Ocean Research Partnership (IWC-SORP) progress since SC/65a. Progress made by the five on-going research projects is summarised below. SC/65b/SH12rev Annex 1 provided an update on the Antarctic Blue Whale Project. Its objectives are to improve current understanding of the status of the Antarctic blue whales and their role in the Antarctic ecosystem. The project has recently cooperated on five voyages to the Southern Ocean: (1) 2013 Voyage to the Ross Sea, led by the Australian Antarctic Division (SC/65a/SH21); (2) 2013/14 Whale Song Antarctic Voyage for Ecosystem Studies (WAVES) Expedition, led by the Centre for Whale Research, Australia; (3) 2014 voyage to the Antarctic Peninsula, an initiative of the South American Consortium led by Argentina (SC/65b/SH16Rev); (4) South African voyage to the Queen Maud Land coast (SC/65b/SH01); and (5) CETA voyage to the Dumont d’Urville Sea led by France (SC/65b/SH05). Data are also being augmented with information from ships of opportunity that contribute sightings data to the online reporting system.
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    Taking account of sample size in the GLM analyses of the response variable data from the island closure feasibility study
    (2014) Butterworth, Doug S; Ross-Gillespie, A
    Two approaches are used to examine the impact of taking sample size into account in GLM analyses to estimate the fishing effect parameter λ. In the first the variance of each mean value input to the analyses is disaggregated into separate contributions reflecting process error (taken to be constant) and observation error (taken to be inversely proportional to sample size). The second simpler approach merely omits values for which the sample size was very low. The implications are evaluated for the majority of the scenarios considered and methods applied in earlier analyses which did not account explicitly for sample size. The pattern of results when sample size is taken into account is clear and consistent: broadly speaking results do not change much in the great majority of cases, and in particular the substantial preponderance of positive to negative estimates of the fishing effect parameter λ remains.