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    Southern hemisphere breeding stock 'D' humpback whale population estimates from North West Cape, Western Australia

    191039_73896_salgado_southern_hemisphere_breeding_2012.pdf (1.287Mb)
    Access Status
    Open access
    Authors
    Salgado Kent, Chandra
    Jenner, C.
    Jenner, M.
    Bouchet, P.
    Rexstad, E.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Salgado Kent, Chandra and Jenner, Curt and Jenner, Micheline and Bouchet, Philippe and Rexstad, Eric. 2012. Southern hemisphere breeding stock 'D' humpback whale population estimates from North West Cape, Western Australia. Journal of Cetacean Research and Management. 12 (1): pp. 29-38.
    Source Title
    Journal of Cetacean Research and Management
    ISSN
    1561-0713
    URI
    http://hdl.handle.net/20.500.11937/34750
    Collection
    • Curtin Research Publications
    Abstract

    Estimates of the abundance of Breeding Stock D humpback whales (Megaptera novaeangliae) are key to the conservation and management of what is thought to be one of the largest populations of the species. Five years (2000, 2001, 2006, 2007 and 2008) of aerial surveys carried out over an eight-year period at North West Cape (Western Australia) using line transect methodology allowed trends in whale numbers to be investigated, and provided a base for comparison with estimates made approximately400km south at Shark Bay (Western Australia). A total of 3,127 whale detections were made during 74 surveys of the 7,043km2 study area west of NWC. Pod abundance for each flight was computed using a Horvitz-Thompson like estimator and converted to an absolute measure of abundance after corrections were made for estimated mean cluster size, unsurveyed time, swimming speed and animal availability.Resulting estimates from the migration model of best fit with the most credible assumptions were 7,276 (CI = 4,993–10,167) for 2000, 12,280 (CI = 6,830–49,434) for 2001, 18,692 (CI = 12,980–24,477) for 2006, 20,044 (CI = 13,815–31,646) for 2007, and 26,100 (CI = 20,152–33,272) for 2008. Based on these data, the trend model with the greatest r2 was exponential with an annual increase rate of 13% (CI = 5.6%–18.1%). While this value is above the species’ estimated maximum plausible growth rate of 11.8%, it is reasonably close to previous reports of between 10–12%. The coefficient of variation, however, was too large for a reliable trend estimate. Perception bias was also not accounted for in these calculations. Based on a crude appraisal which yielded an estimated p(0) of 0.783 (from independent observer effort, CV = 0.973), the 2008 humpback population size may be as large as 33,300. In conclusion, the work here provides evidence of an increasing Breeding Stock D population, but further surveys are necessary to confirm whether the population is indeed increasing at its maximum rate.

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