[MARMAM] New publication: Productivity aggregates killer whales and other cetaceans in the Bremer Sub-Basin, south-western Australia
pjbouchet at gmail.com
Mon Jul 13 06:13:32 PDT 2020
My co-authors and I are pleased to announce the publication of our new paper on the distribution and abundance of cetaceans in the Bremer Sub-Basin, Western Australia – with a particular focus on killer whales. The paper is freely available from the journal’s website.
Salgado Kent CP, Bouchet PJ, Wellard R, Parnum I, Fouda L, Erbe C (2020). Seasonal productivity drives aggregations of killer whales and other cetaceans over submarine canyons of the Bremer Sub-Basin, south-western Australia. Australian Mammalogy, DOI: 10.1071/AM19058
Cetaceans are iconic predators that serve as important indicators of marine ecosystem health. The Bremer Sub-Basin, south-western Australia, supports a diverse cetacean community including the largest documented aggregation of killer whales (Orcinus orca) in Australian waters. Knowledge of cetacean distributions is critical for managing the area’s thriving ecotourism industry, yet is largely sporadic. Here we combined aerial with opportunistic ship-borne surveys during 2015–2017 to describe the occurrence of multiple cetacean species on a regional scale. We used generalised estimating equations to model variation in killer whale relative density as a function of both static and dynamic covariates, including seabed depth, slope, and chlorophyll a concentration, while accounting for autocorrelation. Encountered cetacean groups included: killer (n = 177), sperm (n = 69), long-finned pilot (n = 29), false killer (n = 2), and strap-toothed beaked (n = 1) whales, as well as bottlenose (n = 12) and common (n = 5) dolphins. Killer whale numbers peaked in areas of low temperatures and high primary productivity, likely due to seasonal upwelling of nutrient-rich waters supporting high prey biomass. The best predictive model highlighted potential killer whale ‘hotspots’ in the Henry, Hood, Pallinup and Bremer Canyons. This study demonstrates the value of abundance data from platforms of opportunity for marine planning and wildlife management in the open ocean.
Dr. Phil Bouchet | Postdoctoral Research Fellow
Centre for Research into Ecological & Environmental Modelling (CREEM)
The Observatory, Buchanan Gardens
University of St Andrews, St Andrews Fife
KY16 9LZ, Scotland (UK)
E pjbouchet at gmail.com | pb282 at st-andrews.ac.uk
Twitter @pjbouchet • Web pjbouchet.github.io
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