Great Australian Bight Marine Park

Great Australian Bight Marine Park is a Commonwealth marine protected area located in the Great Australian Bight, an expansive oceanic bight off the central and western coasts of Australia. Managed by Parks Australia, it was established to protect one of the most significant marine ecosystems in Australian waters, renowned for its high biological productivity and unique geological features. The park safeguards critical habitats for a diverse array of marine life, including several endangered species, and plays a vital role in scientific research and sustainable resource use.

Geography and location

The park encompasses approximately 45,822 square kilometres of ocean, situated in both state and Commonwealth waters off the southern coast of Australia. It lies adjacent to the coastline of South Australia and Western Australia, stretching from near the Head of Bight in the east to offshore from Eucla in the west. The marine environment is dominated by the continental shelf and the dramatic, steeply sloping continental slope that plunges into the Southern Ocean. Key geological features include the Eucla Canyon, a massive submarine canyon system, and the Bight Basin, a significant sedimentary basin. The region is influenced by the northward-flowing Flinders Current and the eastward-flowing Leeuwin Current, which converge to create highly productive waters.

History and establishment

The area's significance was formally recognized by the Australian Government following extensive oceanographic and biological studies in the late 20th century. Initial protection was established in 1998 under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act), designating the first marine park in the region. This was part of a broader national strategy to create a representative system of Marine Protected Areas around Australia. The park's boundaries and management plans have been reviewed and adjusted over time, incorporating new scientific data and stakeholder input. Key milestones include its inclusion in the South-west Marine Region network and subsequent management plan reviews led by the Director of National Parks.

Ecology and biodiversity

The park protects an ecosystem of exceptional productivity, driven by seasonal upwelling that brings nutrient-rich waters to the surface. This supports vast blooms of phytoplankton, forming the base of a rich food web. The area is a globally significant habitat for cetaceans, most notably as a crucial nursery and feeding ground for the endangered Southern right whale. Other notable marine mammals include Australian sea lions, New Zealand fur seals, and various species of dolphins and beaked whales. The benthic environment, particularly the Eucla Canyon, hosts diverse communities of deep-sea corals, sponges, and associated invertebrates. The park also provides important foraging areas for seabirds like the wandering albatross and flesh-footed shearwater.

Management and protection

The park is managed by Parks Australia under the EPBC Act, with zoning designed to balance protection and sustainable use. The management plan establishes multiple zones, including highly protected Sanctuary Zones (IUCN Ia) where extractive activities are prohibited, and Habitat Protection Zones that safeguard the seafloor while allowing some fishing. Key management objectives include protecting biodiversity, conserving threatened species and ecological communities, and managing human activities to minimize impacts. The park is part of the National Representative System of Marine Protected Areas (NRSMPA). Ongoing threats addressed by management include potential oil and gas exploration, climate change, and impacts from commercial fishing activities adjacent to the park.

Human uses and activities

The park supports a range of regulated human activities. It is a prime location for whale watching, particularly at the Head of Bight where Southern right whales congregate. Limited commercial fishing occurs under strict quotas in specific zones, targeting species like deepwater flathead and blue grenadier. The park is a vital area for marine science, with research conducted by institutions like the CSIRO and various universities on topics from oceanography to whale ecology. Recreational fishing is permitted in certain zones, and the dramatic coastline attracts tourism and nature-based tourism. The waters are also part of major shipping lanes, with vessel traffic managed to reduce the risk of pollution and wildlife strikes.

Category:Marine parks of Australia Category:Protected areas of South Australia Category:Protected areas of Western Australia Category:Great Australian Bight