Tidal influences on foraging strategies of resident bottlenose dolphins (Tursiops aduncus) in Jervis Bay, NSW

Observations of tidal influences on foraging strategies of Indo-Pacific bottlenose dolphins (Tursiops aduncus) resident in Jervis Bay, New South Wales are discussed. Currambene Creek is an outlet, located on the western edge... [ view full abstract ]

Observations of tidal influences on foraging strategies of Indo-Pacific bottlenose dolphins (Tursiops aduncus) resident in Jervis Bay, New South Wales are discussed. Currambene Creek is an outlet, located on the western edge of Jervis Bay, with high vessel traffic site associated with commercial fishing, ecotourism operators and recreational boat users. The area of Jervis Bay is a multiple use marine park, which also accommodates active training with the Royal Australian Navy. Resident inshore bottlenose dolphins inhabit Jervis Bay, associated with rocky reefs, coastal fringes, estuaries and creek systems. Shallow protected habitats around Jervis Bay provide a consistent food supply for the dolphins, with rocky reefs or seagrass meadows recognised as preferred foraging grounds. Observations have highlighted the importance of estuaries as preferred habitats for foraging activities, engaged by recognised individuals and/or small groups of 2-3 resident dolphins, showing a degree of site fidelity, displaying these foraging strategies. Targeting scattered prey that congregate around the Currambene Creek inlet, particularly during the changing tides when the creek is flushed in and out on a mid- to high-tide. Foraging dolphins have been documented, engaged in active pursuit against the tide, makes them seem stationary as the unknowing prey is flushed inward and capture and consumption by the awaiting dolphins. Information gathered from research efforts will provide critical data to help inform on future management decisions associated with urban development on inshore dolphins in Jervis Bay.