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SC/69B/CMP/08
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Resource ID
22051
Access
Open
Document Number
SC/69B/CMP/08
Full Title
2023 population assessment of southern right whales in the south-western Atlantic Ocean
Author
Romero, M.A., M.A. Coscarella, G.D. Adams, J.C. Pedraza, R.A. Gonz lez And E.A. Crespo
Authors Summary
We updated the Bayesian state-space surplus production model developed for southern right whale (SRW) Eubalena australis by Romero et al. (2022) to include additional years of aerial-survey data collected in 2021-2023. Demographic parameters were derived from a model averaged ensemble of 11 model sensitivities described in Romero et al. (2022). The population trajectory indicated that the pre-exploitation abundance was close to 55,000 individuals (median = 54,991; 95% CI = 32,358?93,381). The abundance dropped to its lowest abundance levels in the 1830s when fewer than 2,000 individuals remained. The current median population abundance in 2023 was estimated at 5,159 whales (95% CI = 4,126?6,585). This suggests that while the SRW population remains small relative to its pre-exploitation abundance (median depletion P2023 = 9.9%), it continues to recover.
Publisher
IWC
Publication Year
2024