Moulting Lagoon Important Bird Area is a composite wetland site in eastern

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

, Australia. It comprises two adjacent and

hydrologically Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability. A practitioner of hydrology is call ...

continuous wetlands – Moulting Lagoon and the Apsley Marshes – at the head of

Great Oyster Bay Great Oyster Bay is a broad and sheltered bay on the east coast of Tasmania, Australia which opens onto the Tasman Sea. The Tasman Highway runs close to the West Coast of the bay with views of the granite peaks of the Hazards and Schouten Island ...

, near the base of the Freycinet Peninsula, between the towns of Swansea and

Bicheno Bicheno is a locality and town on the east coast of Tasmania, Australia, 185 km north-east of Hobart on the Tasman Highway, with a population of around 950. It is part of the municipality of Glamorgan-Spring Bay. The town is primarily a fi ...

. Both components of the site are listed separately under the

Ramsar Convention The Ramsar Convention on Wetlands of International Importance Especially as Waterfowl Habitat is an international treaty for the conservation and sustainable use of Ramsar site, Ramsar sites (wetlands). It is also known as the Convention on W ...

as wetlands of international significance. Moulting Lagoon is so named because it is a traditional moulting place for black swans. It is an important site for

waterbird A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water. In some definitions, the term ''water bird'' is especially applied to birds in freshwater ecosystems, although others make no distinction from seabi ...

Description

Moulting Lagoon is a coastal lagoon, or largely enclosed

estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environm ...

, formed at the mouths of the Swan and Apsley Rivers, which have a combined

catchment area In human geography, a catchment area is the area from which a location, such as a city, service or institution, attracts a population that uses its services and economic opportunities. Catchment areas may be defined based on from where people are ...

of 900 km², and sheltered from the ocean by Nine Mile Spit. It is adjacent to the Apsley Marshes which store and filter

flood A flood is an overflow of water ( or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are an area of study of the discipline hydrol ...

water from the Apsley River for gradual release into the lagoon. The geology of the site is dominated by

Holocene The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene togeth ...

alluvial gravels and sands with smaller areas of

Jurassic The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of ...

dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grain ...

and

Triassic The Triassic ( ) is a geologic period and system (stratigraphy), system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Year#Abbreviations yr and ya, Mya), to the beginning of the Jurassic Period 201.36 ...

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates ...

. Average annual rainfall (recorded at Swansea) is 611 mm; average maximum temperatures are 13 °C in winter and 22 °C in summer. The tidal range of the lagoon varies from 0.3 m in its upper reaches to 0.8 m at the mouth. Although the lagoon's hydrology is usually dominated by its estuarine nature, during peak flows of the Swan River these are overridden by large quantities of fresh water. During hot, dry weather, salinity levels may reach twice that of seawater in some areas. The lagoon contains areas of both deep and shallow water and is surrounded by tidal mudflats and

saltmarsh A salt marsh or saltmarsh, also known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone between land and open saltwater or brackish water that is regularly flooded by the tides. It is dominated ...

. The western shore has been cleared and is mainly used for agriculture and

livestock Livestock are the domesticated animals raised in an agricultural setting to provide labor and produce diversified products for consumption such as meat, eggs, milk, fur, leather, and wool. The term is sometimes used to refer solely to animal ...

grazing; the eastern shore retains much of its native vegetation.

Plants

Zostera ''Zostera'' is a small genus of widely distributed seagrasses, commonly called marine eelgrass, or simply seagrass or eelgrass, and also known as seaweed by some fishermen and recreational boaters including yachtsmen. The genus ''Zostera'' co ...

'' seagrasses cover about 25 km² of the lagoon bed. The margins support successive bands of

beaded glasswort ''Salicornia quinqueflora'', synonym ''Sarcocornia quinqueflora'', commonly known as beaded samphire, bead weed, beaded glasswort or glasswort, is a species of succulent halophytic coastal shrub. It occurs in wetter coastal areas of Australia ...

, jointed rush and '' Poa'' grass tussocks, swamp paperbark and silver wattle, and Oyster Bay pine or

pasture Pasture (from the Latin ''pastus'', past participle of ''pascere'', "to feed") is land used for grazing. Pasture lands in the narrow sense are enclosed tracts of farmland, grazed by domesticated livestock, such as horses, cattle, sheep, or sw ...

. Apsley marshes contain areas of woody vegetation dominated by paperbarks, some saltmarsh, large areas of

common reed ''Phragmites australis'', known as the common reed, is a species of plant. It is a broadly distributed wetland grass that can grow up to tall. Description ''Phragmites australis'' commonly forms extensive stands (known as reed beds), which may ...

and freshwater aquatic herbland.

Birds

The lagoon and the adjacent marshes have been identified by BirdLife International as a 63 km² Important Bird Area (IBA) because they regularly support over 1% of the world populations of black swans and

pied oystercatcher The pied oystercatcher (''Haematopus longirostris'') is a species of oystercatcher. It is a wading bird native to Australia and commonly found on its coastline. The similar South Island pied oystercatcher (''H. finschi'') occurs in New Zealand. ...

s. Other

s sometimes present on the lagoon in substantial numbers include

Australian shelduck The Australian shelduck (''Tadorna tadornoides''), also known as the chestnut-breasted shelduck or mountain duck, is a shelduck, a group of large goose-like ducks part of the bird family Anatidae. The genus name ''Tadorna'' comes from Celtic root ...

s, chestnut teals, Australasian shovellers,

musk duck The musk duck (''Biziura lobata'') is a highly aquatic, stiff-tailed duck native to southern Australia. It is the only living member of the genus '' Biziura''. An extinct relative, the New Zealand musk duck or de Lautour's duck (''B. delauto ...

s, black-faced and

little pied cormorant The little pied cormorant, little shag or kawaupaka (''Microcarbo melanoleucos'') is a common Australasian waterbird, found around the coasts, islands, estuaries, and inland waters of Australia, New Guinea, New Zealand, Thailand, Myanmar, Singapo ...

s, hoary-headed and

great crested grebe The great crested grebe (''Podiceps cristatus'') is a member of the grebe family of water birds noted for its elaborate mating display. Taxonomy The great crested grebe was formally described by the Swedish naturalist Carl Linnaeus in 1758 in t ...

s, crested and

Caspian tern The Caspian tern (''Hydroprogne caspia'') is a species of tern, with a subcosmopolitan but scattered distribution. Despite its extensive range, it is monotypic of its genus, and has no accepted subspecies. The genus name is from Ancient Greek ' ...

white-faced heron The white-faced heron (''Egretta novaehollandiae'') also known as the white-fronted heron, and incorrectly as the grey heron, or blue crane, is a common bird throughout most of Australasia, including New Guinea, the islands of Torres Strait, Ind ...

s, masked lapwings, red-capped and

double-banded plover The double-banded plover (''Charadrius bicinctus''), known as the banded dotterel or pohowera in New Zealand, is a species of bird in the plover family. Two subspecies are recognised: the nominate ''Charadrius bicinctus bicinctus'', which breed ...

s, and

red-necked stint The red-necked stint (''Calidris ruficollis'') is a small migratory wader. The genus name is from Ancient Greek ''kalidris'' or ''skalidris'', a term used by Aristotle for some grey-coloured waterside birds. The specific ''ruficollis'' is from ...

s.BirdLife International. (2011). Important Bird Areas factsheet: Moulting Lagoon. Downloaded from http://www.birdlife.org on 18/08/2011. It supports the largest flock of

common greenshank The common greenshank (''Tringa nebularia'') is a wader in the large family Scolopacidae, the typical waders. The genus name ''Tringa'' is the New Latin name given to the green sandpiper by Aldrovandus in 1599 based on Ancient Greek ''trungas'' ...

s in Tasmania.

History

The area was extensively used by the Oyster Bay Tribe, especially for harvesting swan eggs, prior to European settlement in the early 19th century. By the late 1820s most arable land in the region had been taken by European settlers. Subsequently, it became a popular site for

waterfowl hunting Waterfowl hunting (also called wildfowling or waterfowl shooting in the UK) is the practice of hunting ducks, geese, or other waterfowl for food and sport. Many types of ducks and geese share the same habitat, have overlapping or identical hunt ...

, especially of chestnut teal and Australian shelduck. In 1918 much of the lagoon was proclaimed a sanctuary for waterfowl, though in 1928 it reverted to crown land. In 1959 and 1980 some parts of the lagoon were given legislative protection; however, attempts to give protection to the whole area was resisted by duck hunters and local residents. It was eventually proclaimed a

game reserve A game reserve (also known as a wildlife preserve or a game park) is a large area of land where wild animals live safely or are hunted in a controlled way for sport. If hunting is prohibited, a game reserve may be considered a nature reserve; ...

in 1988, with seasonal hunting over much of the area continuing to take place, though the use of

lead shot Shot is a collective term for small spheres or pellets, often made of lead. These were the original projectiles for shotguns and are still fired primarily from shotguns and less commonly from riot guns and grenade launchers, although shot shell ...

ended in 2005. Contemporary use of the lagoon includes recreational boating and fishing as well as

oyster farming Oyster farming is an aquaculture (or mariculture) practice in which oysters are bred and raised mainly for their pearls, shells and inner organ tissue, which is eaten. Oyster farming was practiced by the ancient Romans as early as the 1st century ...

Ramsar listing

On 16 November 1982 most of what was to become the 4760 ha Moulting Lagoon Game Reserve in 1988 was designated Ramsar site 251, and a 940 ha area of the Apsley Marshes was designated Ramsar site 255, mainly because of their value as waterbird habitat, especially for black swans.

References

{{coord, 42, 01, 33, S, 148, 11, 25, E, display=title, region:AU-TAS_type:waterbody Important Bird Areas of Tasmania Lagoons of Australia Estuaries of Tasmania Ramsar sites in Australia