The Macquarie Marshes comprise the wetland

Wetland

A wetland is an area of land whose soil is saturated with water either permanently or seasonally. Wetlands are categorised by their characteristic vegetation, which is adapted to these unique soil conditions....

s associated with the floodplain

Floodplain

A floodplain, or flood plain, is a flat or nearly flat land adjacent a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls and experiences flooding during periods of high discharge...

s of the Macquarie River and its tributaries, in northern New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. The Macquarie River and the marshes eventually drain into the Darling River

Darling River

The Darling River is the third longest river in Australia, measuring from its source in northern New South Wales to its confluence with the Murray River at Wentworth, New South Wales. Including its longest contiguous tributaries it is long, making it the longest river system in Australia.The...

. The marshes are important as a breeding site for waterbirds, especially in the aftermath of major floods.

Description

The marshes consist of a system of freshwater channels and streams, some of which are permanent following construction of water regulation devices, with semi-permanent and ephemeral swamps and floodplains. The extent of the marshes varies according to the extent of flooding. The historical maximum flooding of 4780 km² was recorded in the mid 1950s; since then flooding has become both less frequent and less extensive. Most of the area covered by the marshes is used as rangeland

Rangeland

Rangelands are vast natural landscapes in the form of grasslands, shrublands, woodlands, wetlands, and deserts. Types of rangelands include tallgrass and shortgrass prairies, desert grasslands and shrublands, woodlands, savannas, chaparrals, steppes, and tundras...

 or pasture

Pasture

Pasture 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 swine. The vegetation of tended pasture, forage, consists mainly of grasses, with an interspersion of legumes and other forbs...

; some 10% is protected in the Macquarie Marshes Nature Reserve

Macquarie Marshes Nature Reserve

The Macquarie Marshes Nature Reserve is located in the Macquarie Marshes, a region along the lower Macquarie River in northwestern New South Wales, Australia, about 600 km northwest of Sydney. The marshes are created by irregular flooding of the flat lands along the river...

. Among the variety of vegetation types supported by the marshes are River Red Gum

River Red Gum

The River Red Gum is a tree of the genus Eucalyptus. It is one of around 800 in the genus. It is a plantation species in many parts of the world, but is native to Australia, where it is widespread, especially beside inland water courses...

 forest

Forest

A forest, also referred to as a wood or the woods, is an area with a high density of trees. As with cities, depending where you are in the world, what is considered a forest may vary significantly in size and have various classification according to how and what of the forest is composed...

 and woodland

Woodland

Ecologically, a woodland is a low-density forest forming open habitats with plenty of sunlight and limited shade. Woodlands may support an understory of shrubs and herbaceous plants including grasses. Woodland may form a transition to shrubland under drier conditions or during early stages of...

, extensive beds of Common Reed

Phragmites

Phragmites, the Common reed, is a large perennial grass found in wetlands throughout temperate and tropical regions of the world. Phragmites australis is sometimes regarded as the sole species of the genus Phragmites, though some botanists divide Phragmites australis into three or four species...

, and meadows

Flood-meadow

A flood-meadow is an area of grassland or pasture beside a river, subject to seasonal flooding. Flood-meadows are distinct from water-meadows in that the latter are artificially created and maintained, with flooding controlled on a seasonal and even daily basis.- Examples :* Angel & Greyhound...

 of Water Couch

Paspalum distichum

Paspalum distichum is a species of grass known by the common name knotgrass. Other common names include couch paspalum, eternity grass, gingergrass, and Thompson grass. Its native range is obscure because it has long been present on most continents, and in most areas it is certainly an introduced...

. Daily temperatures in the area vary from about 4°C

Celsius

Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius , who developed a similar temperature scale two years before his death...

 in July to 36°C in January, with an average annual rainfall of 300-400 mm.

Fauna

The marshes support at least eight native and six introduced

Introduced species

An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...

 mammal

Mammal

Mammals are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young...

s, with 56 species of reptile

Reptile

Reptiles are members of a class of air-breathing, ectothermic vertebrates which are characterized by laying shelled eggs , and having skin covered in scales and/or scutes. They are tetrapods, either having four limbs or being descended from four-limbed ancestors...

, 15 species of frog

Frog

Frogs are amphibians in the order Anura , formerly referred to as Salientia . Most frogs are characterized by a short body, webbed digits , protruding eyes and the absence of a tail...

 and 16 species of freshwater fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

.

Birds

The Macquarie Marshes have been identified by BirdLife International

BirdLife International

BirdLife International is a global Partnership of conservation organisations that strives to conserve birds, their habitats and global biodiversity, working with people towards sustainability in the use of natural resources...

 as a 2378 km² Important Bird Area

Important Bird Area

An Important Bird Area is an area recognized as being globally important habitat for the conservation of bird populations. Currently there are about 10,000 IBAs worldwide. The program was developed and sites are identified by BirdLife International...

 (IBA), defined by the maximum extent of the 1990 floods. Among over 200 species of birds recorded, the marshes have supported over 1% of the world population of the endangered Australasian Bittern

Australasian Bittern

The Australasian Bittern , also known as the Brown Bittern, is found in south-western and south-eastern Australia, Tasmania, New Zealand, New Caledonia and Ouvea. Populations in Australia and New Zealand have declined in the 20th century.It is a large bittern, patterned and streaked brown, buff...

, as well as of White-necked Heron

White-necked Heron

The White-necked Heron, Ardea pacifica also known as the Pacific Heron is found throughout New Guinea and Australia, except for the most arid regions, and is a vagrant to New Zealand....

s, Intermediate Egret

Intermediate Egret

The Intermediate Egret, Median Egret, or Yellow-billed Egret is a medium-sized heron. It is a resident breeder from east Africa across tropical southern Asia to Australia. It often nests in colonies with other herons, usually on platforms of sticks in trees or shrubs...

s, Nankeen Night-Herons, Australian White

Australian White Ibis

The Australian White Ibis , is a wading bird of the ibis family Threskiornithidae. It is widespread across much of Australia...

 and Straw-necked Ibis

Straw-necked Ibis

The Straw-necked Ibis is a bird of the ibis and spoonbill family Threskiornithidae. It can be found throughout Australia, New Guinea, and parts of Indonesia. Adults have distinctive straw-like feathers on their neck....

es, and Sharp-tailed Sandpiper

Sharp-tailed Sandpiper

The Sharp-tailed Sandpiper, Calidris acuminata is a small wader.- Taxonomy :More recently, a review of new data has indicated that this bird should perhaps better be placed into the genus Philomachus- as P...

s. The IBA also supports a population of Diamond Firetail

Diamond Firetail

The Diamond Firetail Stagonopleura guttata is a species of estrildid finch found in eastern Australia, from Eyre Peninsula, South Australia, to south-eastern Queensland, commonly found on the slopes of the Great Dividing Range. The bird lives in eucalypt forest and woodland, mallee country,...

s. Other birds recorded in substantial numbers include Glossy Ibis

Glossy Ibis

The Glossy Ibis is a wading bird in the ibis family Threskiornithidae.This is the most widespread ibis species, breeding in scattered sites in warm regions of Europe, Asia, Africa, Australia, and the Atlantic and Caribbean region of the Americas...

es, Intermediate

Intermediate Egret

The Intermediate Egret, Median Egret, or Yellow-billed Egret is a medium-sized heron. It is a resident breeder from east Africa across tropical southern Asia to Australia. It often nests in colonies with other herons, usually on platforms of sticks in trees or shrubs...

, Great

Great Egret

The Great Egret , also known as the Great White Egret or Common Egret, White Heron, or Great White Heron, is a large, widely-distributed egret. Distributed across most of the tropical and warmer temperate regions of the world, in southern Europe it is rather localized...

 and Little Egret

Little Egret

The Little Egret is a small white heron. It is the Old World counterpart to the very similar New World Snowy Egret.-Subspecies:Depending on authority, two or three subspecies of Little Egret are currently accepted....

s, Royal Spoonbill

Royal Spoonbill

The Royal Spoonbill, Platalea regia, also known as the Black-billed Spoonbill, occurs in intertidal flats and shallows of fresh and saltwater wetlands in Australia, New Zealand, Indonesia, Papua New Guinea, and the Solomon Islands. It has also been recorded as a vagrant in New Caledonia...

s, Pacific Black Duck

Pacific Black Duck

The Pacific Black Duck is a dabbling duck found in much of Indonesia, New Guinea, Australia, New Zealand, and many islands in the southwestern Pacific, reaching to the Caroline Islands in the north and French Polynesia in the east. It is usually called the Grey Duck in New Zealand...

s and Caspian Tern

Caspian Tern

The Caspian Tern is a species of tern, with a subcosmopolitan but scattered distribution. Despite its extensive range, it is monotypic of its genus, and has no subspecies accepted either...

s. Australian Painted Snipe

Australian Painted Snipe

The Australian Painted Snipe is a medium-sized, long-billed, distinctively patterned wader.-Taxonomy:The distinctiveness of the Australian Painted-snipe was recognised by John Gould in 1838 when he described and named it Rostratula australis. However, it was subsequently lumped with the Greater...

s, Superb Parrots, Painted

Painted Honeyeater

The Painted Honeyeater is a species of bird in the Meliphagidae family. It is monotypic within the genus Grantiella.It is endemic to Australia. Its natural habitat is subtropical or tropical dry forests...

 and Pied Honeyeater

Pied Honeyeater

The Pied Honeyeater is a species of bird in the Meliphagidae family.It is endemic to Australia.-References:* BirdLife International 2004. . Downloaded on 25 July 2007....

s have been recorded from the IBA.