Links between Gulf rivers and food for migratory shorebirds

Migratory shorebirds are present in vast numbers along the Gulf of Carpentaria’s south-east coastline, especially from ​September to April. These shallow and productive tidal environments are important resting and feeding areas, as well as staging areas for birds that fly north or south. The critically endangered Great Knot and Far Eastern Curlew are among the many migratory bird species using the Gulf coast, and food and rest are vital to their continued survival. The south-east Gulf’s significance for shorebirds has been recognised through its inclusion as a site in the international East Asian-Australasian Flyway Site Network.

Rivers flowing into the Gulf deliver freshwater, sediments and nutrients to estuaries and nearby coastal areas, nourishing the mudflats where shorebirds rest and forage for shellfish, crustaceans and worms. Developments that use significant water or changes in climate that alter river flows may therefore impact the survival of the shorebirds.

This project aims to quantify and compare the shorebird food resources produced by three Gulf river systems that flow alteration may affect – the Flinders, Gilbert and Mitchell Rivers. It will identify the ​relative importance of the estuaries and adjacent mudflats ​in terms of food resources for shorebirds. This information will inform future water planning, environmental impact assessments, and migratory shorebird habitat protection and management.

This project will:

  • improve our understanding of the role of freshwater, associated nutrient loads and benthic animals in providing sufficient food of the right quality and quantity to support shorebird species
  • inform water resource planning especially in the Flinders, Gilbert and Mitchell Rivers, and the environmental assessment of development proposals in the region
  • improve shorebird habitat protection and management, for example through contributions to priority actions in the Australian Government’s Wildlife Conservation Plan for Migratory Shorebirds, to actions for the Far Eastern Curlew in the Threatened Species Strategy, and to the East Asian-Australasian Flyway Site Network
  • help inform management of other relevant Environmental Protection and Biodiversity Conservation Act-listed species and Ramsar wetlands.

Project activities

  • Examine previous reports on shorebird distribution, abundance and diversity in the region
  • Sample the benthic organisms that provide food for shorebirds in the Flinders, Gilbert and Mitchell Rivers, in both the wet and dry seasons, to examine densities and diversity
  • Assess key shorebird species’ food preferences, the kinds of food available relative to their needs, and what kind of developments are most likely to impact on shorebirds
  • Analyse field and experimental data to determine how different flows affect densities of benthic organisms, and the implications for different shorebird species, eg. those with longer bills or shorter bills feeding at different depths in the substrate
  • Compare the results to those from other studies in comparable locations.

Anticipated outputs

  • Conceptual models of flow regime, food webs and shorebird use of intertidal habitats
  • Decision tree or guide outlining the implications of the findings for decision making
  • Referral guidelines and conservation advice to improve species management in the Gulf of Carpentaria
  • Report, scientific papers and factsheets summarising key research findings.

This project is being led by Professor Michele Burford at Griffith University. Professor Burford will be assisted by researchers from Griffith University and the Queensland Department of Environment and Science.

Contact
Michele Burford, Griffith University
[email protected]
(07) 3735 6723

Griffith logo Qld govt logo

  • The Great Knot is critically endangered but finds refuge and food along the south-east Gulf coast, FLPA/Alamy stock photo.
  • Shorebirds that migrate from Australia to the other side of the globe depend on food sources available in the Gulf of Carpentaria. Photo: Stephen Faggotter.
  • Research on the Flinders River mouth in the Gulf of Carpentaria. Photo: Stephen Faggotter.
  • A floodplain that provides food for migratory shorebirds. Photo: Michele Burford.
  • Flinders River in the Gulf of Carpentaria. Photo: Stephen Faggotter.