Little compton whale11/9/2023 ![]() ![]() ![]() ![]() Second, we simulated the abundance and distributions of four baleen whale species for the study area and sampled them with both standardized line transect surveys and non-standardized tourist vessel-based surveys, then compared modeled abundance and distributions from each survey to the original simulation. We used a dataset of tourist vessel locations from the southwest Atlantic sector of the Southern Ocean and published knowledge from Southern Ocean sighting surveys to determine the number of tourist vessel voyages required for robust abundance estimates. We explore the potential use of tourist vessel-based sampling as a cost-effective solution for conducting distance sampling surveys for baleen whales in the Southern Ocean. Distance sampling is the standard method for estimating baleen whale abundance but requires specific logistic requirements which are rarely achieved in the remote Southern Ocean. Key to understanding the present and future role of baleen whales in Southern Ocean ecosystems is determining their abundance on foraging grounds. Many populations of southern hemisphere baleen whales are recovering and are again becoming dominant consumers in the Southern Ocean. 5Biodiversity Section, Norwegian Polar Institute, Tromø, Norway.4Norwegian Institute of Marine Research, Bergen, Norway.3Australian Antarctic Division, Hobart, TAS, Australia.2Centre for Marine Socioecology, University of Tasmania, Hobart, TAS, Australia.1Institute of Marine and Antarctic Studies, College of Science and Engineering, University of Tasmania, Hobart, TAS, Australia.Angus Fleetwood Henderson 1,2* Mark Andrew Hindell 1 Simon Wotherspoon 3 Martin Biuw 4 Mary-Anne Lea 1,2 Nat Kelly 3 Andrew Damon Lowther 1,5 ![]()
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