Investigating dolphin population connectivity in southeast Queensland

This study reveals distinct dolphin populations in southeast Queensland, with limited gene flow between the Great Sandy Marine Park and the unprotected Sunshine Coast waters. Using photo-identification and genetic analysis of Indo-Pacific bottlenose dolphins (Tursiops aduncus) and Australian humpback dolphins (Sousa sahulensis), researchers found no spatial or social connectivity across regions, indicating socially separate populations. Social network analysis showed high gregariousness and clustering within each region, with mixed-species associations also observed. Genetic data confirmed two distinct populations with limited gene flow, though potential connectivity via unsurveyed areas like eastern K'gari cannot be ruled out. The study also identified tiger sharks (Galeocerdo cuvier) and white sharks (Carcharodon carcharias) as primary predators, with higher scarring in S. sahulensis and greater predation risk in the Great Sandy Marine Park. These findings highlight the need for tailored marine park zoning and enhanced protection in currently unprotected waters.

Hume, G. (2026). Investigating dolphin population connectivity in southeast Queensland [University of the Sunshine Coast, Queensland]. https://doi.org/10.25907/01081