Abundance, survival and temporary emigration of bottlenose dolphins (Tursiops sp.) off Useless Loop in the western gulf of Shark Bay, Western Australia

A study off Useless Loop in Shark Bay, Western Australia, estimated the abundance of Indo-Pacific bottlenose dolphins (Tursiops sp.) to range between 115 and 208 individuals from 2007 to 2011, with variability likely reflecting individual usage patterns rather than true population changes. Using capture–recapture models on photo-identification data collected during boat-based surveys, researchers found high temporary emigration rates (0.33–0.66), suggesting the study area did not encompass the full range of these dolphins. Apparent survival rates were estimated at 0.95 annually, indicating strong resilience in this population. This baseline data is critical for monitoring potential impacts from climate change or increased human activity on this UNESCO World Heritage Site.

Nicholson, K., Bejder, L., Allen, S. J., Krützen, M., & Pollock, K. H. (2012). Abundance, survival and temporary emigration of bottlenose dolphins (Tursiops sp.) off Useless Loop in the western gulf of Shark Bay, Western Australia. Marine and Freshwater Research, 63(11), 1059–1068. https://doi.org/10.1071/mf12210