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Shorebird Conservation in Australia 2002 1 S HOREBIRD C ONSERVATION IN A USTRALIA by Bianca Priest, Phil Straw and Michael Weston Supplement to Wingspan, vol. 12, no. 4, December 2002 ii Shorebird Conservation in Australia Shorebirds, also known as waders, are seen feeding around the edges of coastal beaches and shorelines, estuaries and mudflats, or inland lakes, lagoons and dams. While most frequent coastal or inland wetlands, a few species occur in grasslands, farmland and bushland. FROM THE TAXONOMIC order Charadriiformes, there are 18 species of resident shorebird (those that Below: While in Australia, shorebirds include plovers, sandpipers, stints, live in Australia all year round), and at least 36 species migratory shorebirds begin curlews, knots, snipes, godwits, avocets, stilts, that migrate each year from other countries to spend to moult into breeding plumage before the long oystercatchers, pratincoles, and some other species. their non-breeding season here. A further 21 vagrant return flight to the Arctic. (Terns and gulls are often grouped together with species are occasionally recorded in Australia This Black-tailed Godwit shorebirds as they too occur in many of the same (see Table). (second bird from left) and habitats, but are not discussed here.) male Bar-tailed Godwit Shorebirds come in different shapes and sizes, Migratory shorebirds (far right) are in full breeding plumage. The Bar-tailed ranging from the tiny Red-necked Stint, which Migratory shorebirds undertake annual migrations Godwits at the back remain weighs only 30 g, to the Eastern Curlew, which can of thousands of kilometres between their non- in non-breeding plumage, weigh up to 1.3 kg. They have a variety of bill breeding and breeding areas, in many cases flying while some of the Great shapes and sizes adapted to the different prey they from the southernmost wetlands of the southern Knots at the front are in the feed on, and legs that vary from long to very long. hemisphere to the coasts and islands of the high process of moulting into breeding plumage. Roebuck One spectacular feature of this group of birds is Arctic. Northward migration to the breeding Bay, north-western Australia. their movements, both within Australia and between grounds typically takes place from March to early Photo by Brian Chudleigh the northern and southern hemispheres. In Australia June, whilst the return migration to non-breeding areas occurs from July to October. During their migration, shorebirds stop off at a number of wetland sites where they feed intensively to build up stores of fat and protein to fuel the next leg of their flight. These migration routes are called Flyways. There are eight shorebird Flyways around the world, each consisting of a geographical grouping of similar routes shared by many species. The East Asian–Australasian Flyway stretches from Siberia and Alaska southwards through east and south-east Asia, to Australia and New Zealand (see Flyway map, p. V). It encompasses 22 countries and is used by 55 migratory species and by over 5 million birds. The breeding season of these migratory shorebirds is a short and hectic period that capitalises on the abundant supply of insect food present in the brief arctic summer. Birds must arrive and breed as soon as snow and ice starts to melt in the nesting Shorebird Conservation in Australia iii areas. Clutches, typically of four eggs, are laid within a week or two of arrival; incubation then takes about three weeks and fledging a further three. Then it’s time to head south before the weather worsens and the food supply dries up. A migrant species that differs from this pattern is the Double-banded Plover, which breeds in New Zealand and migrates to Australia from February to September. A few Australian Pratincole breed in Australia and migrate to Indonesia and New Guinea from March to November; most, however, remain in Australia year-round, so we have classified them here as ‘resident species’. Main picture: Resident Black-winged Stilts and migratory Eastern Curlews roosting at high tide, Roebuck Bay, north-western Australia. Typically, non-breeding shorebirds are gregarious and often Resident shorebirds occur in very large concentrations. Along the coast, their day is normally ruled by the tides – they Resident shorebirds breed in Australia and include feed on shellfish, crabs, shrimps and worms when mudflats are exposed at low tide, and roost on some species that nest exclusively on beaches (e.g. beaches and spits during high tide. Photo by Jan van de Kam the Beach Stone-curlew and Pied Oystercatcher) Above: Painted Snipe, Mt Carbine, Qld. The Vulnerable Painted Snipe is the subject of a recent and others such as the Sooty Oystercatcher that nest national volunteer survey co-ordinated by Birds Australia’s Threatened Bird Network and the AWSG. This survey has documented the distribution and occurrence of the species, and has already on rocky coasts. Resident shorebirds use every type saved one wetland from destruction. Photo by Keith & Lindsay Fisher of wetland: the Painted Snipe, for example, breeds on ephemeral fresh water wetlands, while the Below: The tiny Red-necked Stint, Australia’s smallest migratory shorebird at only 30 g, nevertheless manages to make the huge journey to breed in the Arctic – a distance of some 15,000 km one-way! Banded Stilt breeds on hypersaline lakes in inland Photo by Brian Chudleigh Australia. Some resident species have moved beyond wetlands – the Plains-wanderer nests in grasslands, the Bush Stone-curlew in open woodland and the Resident, migratory and vagrant shorebirds in Australia Masked Lapwing commonly breeds in agricultural and urban landscapes. Resident Migratory Vagrant Resident shorebirds may nest in large colonies Australian Pratincole * Asian Dowitcher American Golden Plover (e.g. Banded Stilt), as solitary pairs (e.g. Black-fronted Banded Lapwing Bar-tailed Godwit Baird’s Sandpiper Plover) or sometimes in loose groups (e.g. Painted Banded Stilt Black-tailed Godwit Buff-breasted Sandpiper Beach Stone-curlew Broad-billed Sandpiper Caspian Plover Snipe). They may be sedentary or undertake nomadic Black-fronted Dotterel Common Greenshank Dunlin movements, depending on availability of habitat and Black-winged Stilt Common Redshank Green Sandpiper breeding opportunities. An example of a sedentary Bush Stone-curlew Common Sandpiper Grey Phalarope species is the Hooded Plover, whose beach Comb-crested Jacana Curlew Sandpiper Hudsonian Godwit environment is relatively stable throughout the year, Hooded Plover Double-banded Plover Kentish Plover thus fulfilling the bird’s requirements year-round. Inland Dotterel Eastern Curlew Lesser Yellowlegs Masked Lapwing Great Knot Little Stint The Banded Stilt, on the other hand, is a nomadic Painted Snipe Greater Sand Plover Little Ringed Plover species that moves in vast numbers from coastal areas Pied Oystercatcher Grey Plover Pheasant-tailed Jacana to central Australia, to exploit the explosion of brine Plains-wanderer Grey-tailed Tattler Ringed Plover shrimp in ephemeral wetlands following Red-capped Plover Latham’s Snipe Short-billed Dowitcher unpredictable rains. Red-kneed Dotterel Lesser Sand Plover South Island Pied Oyster- Red-necked Avocet Little Curlew catcher Sooty Oystercatcher Long-toed Stint Spotted Redshank Marsh Sandpiper Stilt Sandpiper Oriental Plover Upland Sandpiper Oriental Pratincole White-rumped Sandpiper Pacific Golden Plover Wilson’s Phalarope Pectoral Sandpiper Pin-tailed Snipe Red Knot Red-necked Phalarope Red-necked Stint Ruddy Turnstone Ruff Sanderling Sharp-tailed Sandpiper Swinhoe’s Snipe Terek Sandpiper Wandering Tattler Whimbrel Wood Sandpiper * A few Australian Pratincoles migrate to Indonesia and New Guinea. iv Shorebird Conservation in Australia M AIN T HREATS west. It has a massive 22,400 km2 of intertidal flats – the largest expanse in the world. Six hundred Above: Pied Oystercatchers Threats to migratory shorebirds million people (about 10 per cent of the world’s breed on beaches and Australia’s migratory shorebirds encounter few human- population) live in its catchment area. along the shores of other induced problems on their breeding grounds, which The numbers of shorebirds using the Yellow Sea coastal wetlands, laying their eggs in simple scrapes are in sparsely populated areas. However, they share the wetlands are staggering: at least 2 million birds, or on the ground. Nests are East Asian–Australasian Flyway with more than 45 per about 40 per cent of all birds using the East often cryptic, making them cent of the world’s human population, in countries Asian–Australasian Flyway (EAAF), during their susceptible to trampling by with rapidly developing economies. The resultant northward migration alone. The area supports more walkers or crushing by economic and social pressures pose major threats to than 30 per cent of the EAAF populations of 18 4WDs. Eggs and young chicks which have been migratory shorebirds, primarily through wetland species during northward migration; for six of the abandoned by parent birds destruction and alteration, pollution and hunting. species (Bar-tailed Godwit, Eurasian and Eastern disturbed by people, dogs Northward migration is a critical time for migratory Curlews, Great Knot, and Grey and Kentish and vehicles are left shorebirds because they have a very tight schedule if they Plovers), the region carries almost the whole EAAF vulnerable to changes in are to arrive at the breeding grounds on time and in population at this time. temperature and predation by foxes, cats and other good condition, to make full use of the short breeding About 1 million birds use these wetlands on birds. (Oystercatcher) season. Good feeding conditions and safe roosting sites their southward passage. by Kelvin Jakes; (eggs) on the way are essential for successful breeding. While most shorebirds use the region’s wetlands by Bianca Priest The most important region for shorebirds on as migration stopover sites, seven species also occur Far right: Banded Stilt northward migration is the Yellow Sea, yet its in significant concentrations during the non- breeding colony, Lake coastal wetlands are probably the most threatened breeding season and five species breed there in Ballard, WA, 1995.
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