The Mud Islands reserve is located within
Port Phillip
Port Phillip (Kulin languages, Kulin: ''Narm-Narm'') or Port Phillip Bay is a horsehead-shaped bay#Types, enclosed bay on the central coast of southern Victoria (Australia), Victoria, Australia. The bay opens into the Bass Strait via a short, ...
, about south-west of
Melbourne
Melbourne ( ; Boonwurrung/Woiwurrung: ''Narrm'' or ''Naarm'') is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in both Australia and Oceania. Its name generally refers to a met ...
,
Australia
Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
, lying inside Port Phillip Heads, north of
Portsea and east of
Queenscliff. The land area of about is made up of three low-lying islands surrounding a shallow tidal
lagoon
A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') a ...
connected to the sea by three narrow channels. The shapes and configuration of the islands change over the years due to movement of sand by tidal currents.
[
]
History
First sighted by Europeans in 1802, the islands were originally named ''Swan Isles'' because of the large number of swans on the surrounding waters. It was not until 1836 that Lieutenants T M Symonds and H R Henry of surveyed the islands and renamed them ''Mud Islands''.
Protection
In 1961, the Victorian Fisheries and Wildlife Department declared the islands a sanctuary for the White-Faced Storm Petrel. In 1979, the area of the islands above high water was proclaimed a permanent reserve for the management of wildlife. It forms part of the
, which was designated in , as a wetland of international importance, and it is also included on the
Register of the National Estate
The Register of the National Estate was a heritage register that listed natural and cultural heritage places in Australia that was closed in 2007. Phasing out began in 2003, when the Australian National Heritage List and the Commonwealth Heritag ...
. Since 2002 it has been, with the adjacent waters, part of the
Port Phillip Heads Marine National Park
The Port Phillip Heads Marine National Park is a marine protected area located in the vicinity of the bay of Port Phillip, between the Bellarine and Mornington Peninsulas, in Victoria, Australia. The marine national park comprises six separate ...
.
Environment
Flora
Within the reserve there are nine native vegetation communities.
Seagrass meadow
A seagrass meadow or seagrass bed is an underwater ecosystem formed by seagrasses. Seagrasses are marine (saltwater) plants found in shallow coastal waters and in the brackish waters of estuaries. Seagrasses are flowering plants with stems and ...
s,
sand dune
A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, fl ...
s,
mudflat
Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal fl ...
s and
salt marsh
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 ...
es support a diversity of life ranging from marine
invertebrate
Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...
s to
fish
Fish are aquatic, craniate, gill-bearing 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. Approximately 95% of li ...
and
bird
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...
s. Wind and tide are gradually changing the shape of the islands, although they are partly stabilised by a salt marsh of
austral sea-blite and
beaded and
shrubby glasswort. The dense coastal scrub on the northern island has disappeared, apparently as a result of
overgrazing
Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves, or nature res ...
by rabbits. Today only a single specimen of
coastal teatree (''Leptospermum laevigatum'') remains.
Fauna
The site is part of the
Swan Bay and Port Phillip Bay Islands Important Bird Area
The Swan Bay and Port Phillip Bay Islands Important Bird Area comprises a cluster of disparate sites centred at the eastern end of the Bellarine Peninsula, and the southern end of Port Phillip, in Victoria, south-eastern Australia. As well as ...
, identified as such by
BirdLife International
BirdLife International is a global partnership of non-governmental organizations that strives to conserve birds and their habitats. BirdLife International's priorities include preventing extinction of bird species, identifying and safeguarding ...
.
Some 70 species of birds have been recorded on the Islands, which form essential breeding, feeding and roosting areas for
seabird
Seabirds (also known as marine birds) are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same enviro ...
s and
wader
245px, A flock of Dunlins and Red knots">Red_knot.html" ;"title="Dunlins and Red knot">Dunlins and Red knots
Waders or shorebirds are birds of the order Charadriiformes commonly found wikt:wade#Etymology 1, wading along shorelines and mudflat ...
s, many of them
migratory.
Seabirds
The isolation of the islands provides protection from predators and makes them an ideal sanctuary for breeding seabirds, notably the five and a half thousand
white-faced storm-petrel
The white-faced storm petrel (''Pelagodroma marina''), also known as white-faced petrel is a small seabird of the austral storm petrel family Oceanitidae. It is the only member of the monotypic genus ''Pelagodroma''.
Description
The white-faced ...
s which, during summer, lay their eggs in burrows in the loose sand of Middle Island. During the day they feed at sea on shrimps and small fish, returning at night to feed their chicks. Although there are fewer than at nearby
South Channel Fort
South Channel Fort, also known as South Channel Island, is a 0.7 ha artificial island in southern Port Phillip, Victoria, Australia, 6 km north-east of the town of Sorrento. It was part of a network of fortifications protecting the narrow e ...
, nearly a quarter of the white-faced storm-petrels in Victoria breed on Mud Islands.
Silver gull
The silver gull (''Chroicocephalus novaehollandiae'') is the most common gull of Australia. It has been found throughout the continent, but particularly at or near coastal areas. It is smaller than the Pacific gull (''Larus pacificus''), which ...
s are even more numerous. During the second half of the 20th century the breeding population increased to about 100,000. Given a chance, gulls readily attack the eggs and young of other breeding seabirds. The impact is under study.
Other seabirds nesting on Mud Islands include nearly a thousand
crested tern
The greater crested tern Retrieved 28 February 2012 (''Thalasseus bergii''), also called crested tern or swift tern, is a tern in the family Laridae that nests in dense colonies on coastlines and islands in the tropical and subtropical Old World ...
s, one of the largest colonies in Victoria and the only one in
Port Phillip
Port Phillip (Kulin languages, Kulin: ''Narm-Narm'') or Port Phillip Bay is a horsehead-shaped bay#Types, enclosed bay on the central coast of southern Victoria (Australia), Victoria, Australia. The bay opens into the Bass Strait via a short, ...
. Also important to the islands are the dozen breeding pairs of
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 ' ...
s and, in 1983 and 1986, several pairs of
Australian pelican
The Australian pelican (''Pelecanus conspicillatus'') is a large waterbird in the family Pelecanidae, widespread on the inland and coastal waters of Australia and New Guinea, also in Fiji, parts of Indonesia and as a vagrant in New Zealand ...
s.
Little penguin
The little penguin (''Eudyptula minor'') is a species of penguin from New Zealand. They are commonly known as little blue penguins or blue penguins owing to their slate-blue plumage and are also known by their Māori name .
The Australian lit ...
s and
fairy tern
The fairy tern (''Sternula nereis'') is a small tern which is native to the southwestern Pacific. It is listed as " Vulnerable" by the IUCN and the New Zealand subspecies is " Critically Endangered".
There are three subspecies:
* Australian fai ...
s have bred there in the past. The
common tern
The common tern (''Sterna hirundo'') is a seabird in the family Laridae. This bird has a circumpolar distribution, its four subspecies breeding in temperate and subarctic regions of Europe, Asia and North America. It is strongly migrator ...
also roosts in exceptionally large numbers and as many as 260 have been seen there at once.
Waders
The mud from which the islands get their name is excellent feeding habitat for migratory
wader
245px, A flock of Dunlins and Red knots">Red_knot.html" ;"title="Dunlins and Red knot">Dunlins and Red knots
Waders or shorebirds are birds of the order Charadriiformes commonly found wikt:wade#Etymology 1, wading along shorelines and mudflat ...
s. More than 1% of the known Australian populations of four wader species,
Pacific golden plover,
grey plover
The grey plover or black-bellied plover (''Pluvialis squatarola'') is a large plover breeding in Arctic regions. It is a long-distance migrant, with a nearly worldwide coastal distribution when not breeding.
Taxonomy
The grey plover was forma ...
,
lesser sand plover
The lesser sand plover (''Charadrius mongolus'') is a small wader in the plover family of birds. The spelling is commonly given as lesser sand-plover, but the official British Ornithologists' Union spelling is "lesser sand plover". The genu ...
and
ruddy turnstone
The ruddy turnstone (''Arenaria interpres'') is a small cosmopolitan wading bird, one of two species of turnstone in the genus ''Arenaria''.
It is now classified in the sandpiper family Scolopacidae but was formerly sometimes placed in the plov ...
, spend the summer around Mud Islands. More than 5% of the Victorian populations of
red knot
The red knot or just knot (''Calidris canutus'') is a medium-sized shorebird which breeds in tundra and the Arctic Cordillera in the far north of Canada, Europe, and Russia. It is a large member of the ''Calidris'' sandpipers, second only to the ...
,
great knot
__NOTOC__
The great knot (''Calidris tenuirostris'') is a small wader. It is the largest of the calidrid species. The genus name is from Ancient Greek ''kalidris'' or ''skalidris'', a term used by Aristotle for some grey-coloured waterside bird ...
,
eastern curlew
The Far Eastern curlew (''Numenius madagascariensis'') is a large shorebird most similar in appearance to the long-billed curlew, but slightly larger. It is mostly brown in color, differentiated from other curlews by its plain, unpatterned brown ...
and
bar-tailed godwit
The bar-tailed godwit (''Limosa lapponica'') is a large and strongly migratory wader in the family Scolopacidae, which feeds on bristle-worms and shellfish on coastal mudflats and estuaries. It has distinctive red breeding plumage, long legs, an ...
feed in
Swan Bay
Swans are birds of the family Anatidae within the genus ''Cygnus''. The swans' closest relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini. Sometim ...
to the west but roost on the islands at high tide. Two resident waders, the
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. ...
and the
red-capped plover
The red-capped plover (''Charadrius ruficapillus''), also known as the red-capped dotterel, is a small species of plover.
It breeds in Australia. This species is closely related to (and sometimes considered conspecific with) the Kentish plover, ...
, regularly breed on undisturbed parts of the islands.
Other
Few land birds are permanently resident, although many species visit and may breed. Large numbers of
straw-necked ibis and, to a lesser extent,
Australian white ibis
The Australian white ibis (''Threskiornis molucca'') is a wading bird of the ibis family, Threskiornithidae. It is widespread across much of Australia. It has a predominantly white plumage with a bare, black head, long downcurved bill and blac ...
, nest and roost on the islands and fly daily to the mainland for feeding.
Lewin's rail
Lewin's rail (''Lewinia pectoralis'') is a species of bird in the family Rallidae. It is also known as the water rail, Lewin's water rail, Lewin's grind rail, slate-breasted rail, slate-breasted water rail, pectoral rail, pectoral water rail, sho ...
occasionally breeds in the salt marsh but is so shy that nesting is seldom recorded. Up to 100 rare
orange-bellied parrot
The orange-bellied parrot (''Neophema chrysogaster'') is a small parrot endemic to southern Australia, and one of only three species of parrot that migrate. It was described by John Latham in 1790. A small parrot around long, it exhibits sex ...
s have been seen on the islands during winter when they migrate to the Australian mainland from
Tasmania
)
, nickname =
, image_map = Tasmania in Australia.svg
, map_caption = Location of Tasmania in AustraliaCoordinates:
, subdivision_type = Country
, subdi ...
. Since the mid-20th century, however, numbers have declined, possibly because the increasing number of gulls has changed the chemistry of the soil and so the vegetation on which the parrots feed. Nevertheless, the islands are an important habitat for this endangered species.
Bronze whaler
The copper shark (''Carcharhinus brachyurus''), bronze whaler, or narrowtooth shark, is a species of requiem shark, family Carcharhinidae, and the only member of its genus found mostly at temperate latitudes. It is distributed in a number of sepa ...
sharks are known to breed around the islands.
Access
The islands can only be reached by boat, the most convenient departure points being
Queenscliff or
Sorrento
Sorrento (, ; nap, Surriento ; la, Surrentum) is a town overlooking the Bay of Naples in Southern Italy. A popular tourist destination, Sorrento is located on the Sorrentine Peninsula at the south-eastern terminus of the Circumvesuviana rail ...
. Day visitors are permitted, but overnight camping is not. BirdLife Australia conduct regular tours to Mud Islands, usually in February and March. South Bay Eco Adventures also run guided walking tours of the islands. As the islands are surrounded by shallow waters, visitors need to be cautious when attempting a landing. Passengers must be ferried to shore by dinghy or else wade in. Visits need careful planning to avoid the boat being stranded at low tide.
References
* Parks Victoria. (2006). ''Port Phillip Heads Marine National Park Management Plan''. Parks Victoria: Melbourne.
External links
Friends of Mud IslandsBirdLife AustraliaSouth Bay Eco Adventures
{{Islands of Victoria , state=autocollapse
Islands of Victoria (Australia)
Geography of Melbourne
Nature reserves in Victoria (Australia)
Ramsar sites in Australia
Port Phillip
Important Bird Areas of Victoria (Australia)