Purple heron

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Purple heron
Purple heron - Vadodara 2022-01-08.jpg
Adult on a tree, at Vadodara, Gujarat, India
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Pelecaniformes
Family: Ardeidae
Genus: Ardea
Species:
A. purpurea
Binomial name
Ardea purpurea
Linnaeus, 1766
ArdeaPurpureaIUCNver2019 1.png
Range of A. purpurea
  Breeding
  Resident
  Non-breeding

The purple heron (Ardea purpurea) is a wide-ranging heron species. It breeds in Africa, central and southern Europe, and southern and eastern Palearctic. The Western Palearctic populations migrate between breeding and wintering habitats whereas the African and tropical-Asian populations are primarily sedentary, except for occasional dispersive movements. It is similar in appearance to the more common grey heron but is slightly smaller, more slender and has darker plumage. It is also a more evasive bird, favouring densely vegetated habitats near water, particularly reed beds. It hunts for a range of prey including fish, rodents, frogs and insects, either stalking them or standing waiting in ambush.

Contents

Purple herons are colonial breeders and build a bulky nest out of dead reeds or sticks close to the water' edge among reeds or in dense vegetation. About five bluish-green eggs are laid and are incubated by both birds. The young hatch about four weeks later and fledge six weeks after that. The International Union for Conservation of Nature notes that the global population trend is downwards, largely because of the drainage of wetlands, but assesses the purple heron's conservation status as being of "least concern".

Description

3D scan of the skeleton Ardea purpurea 3d scan Natural History Museum University of Pisa AV 6820.stl
3D scan of the skeleton

The purple heron is a large bird, 78–97 cm (31–38 in) in length with a standing height from 70 to 94 cm (28 to 37 in) and a 120–152 cm (47–60 in) wingspan. [2] [3] However, it is slender for its size, weighing only 0.5 to 1.35 kg (1.1 to 3.0 lb). [4] It is somewhat smaller than the grey heron, from which it can be distinguished by its darker reddish-brown plumage, and, in adults, its darker grey back. Adults have the forehead and the crown of the head black, with a dark stripe down the back of the neck that terminates in a slender, dangling crest. This is shorter than the crest of the grey heron and does not exceed 140 mm (5.5 in). The sides of the head and the neck are buffish chestnut, with dark streaks and lines down either side of the whole the neck. The mantle is oily brown and the upper scapular feathers are elongated but not the lower ones. The rest of the upper parts and the tail are brownish grey. The front of the neck is paler than the sides and there are some elongated feathers at the base of the neck which are streaked with white, chestnut and black. The breast is chestnut brown, with some blackening at the side, and the belly and under-tail coverts are black. The brownish-yellow beak is long, straight and powerful, and is brighter in colour in breeding adults. The iris is yellow and the legs are brown at the front and yellowish behind. [5]

A purple heron at Powai Lake, Maharashtra, India Purple Heron at Powai Lake.jpg
A purple heron at Powai Lake, Maharashtra, India

The call is a harsh "frarnk", but is quieter and more high-pitched than that of the grey heron. It is generally a less noisy bird, though similar guttural sounds are heard emanating from the heronry. It is also less robust, and appears somewhat hollow-chested. Its head and neck are more slender and snake-like than the grey heron and its toes much longer. Unlike that bird, it often adopts a posture with its neck extending obliquely, and even nestlings tend to use this stance. [5]

Taxonomy and naming

There are three or four subspecies: [6]

The scientific name comes from Latin ardea "heron", and purpureus, "coloured purple". [9]

Distribution and habitat

Adult A. p. purpurea with chicks at Lake Baringo, Kenya Ardea purpurea -Lake Baringo, Great Rift Valley, Kenya -adult and chicks-8.jpg
Adult A. p. purpurea with chicks at Lake Baringo, Kenya
Immature A. p. manilensis, Maharashtra, India Purple heron (Ardea purpurea) by Shantanu Kuveskar.jpg
Immature A. p. manilensis, Maharashtra, India

The purple heron has a mostly palaearctic distribution and breeds in Europe, Asia and Africa. The range of the western race extends from Portugal eastwards across much of central and southern Europe and parts of North Africa as far as Lake Balkhash in Kazakhstan. In Africa, the bird breeds in Senegal, down the east coast of Africa and in Madagascar. The eastern race extends from the Indian Subcontinent, eastwards to eastern China and the Philippines, and northwards to the basins of the Amur River and the Ussuri River at about 49°N. The southern race is restricted to Madagascar, [10] and a small population of purple herons on the Cape Verde Islands is regarded as a separate race by some authorities. [7]

Between August and October, birds of the western population migrate southwards to tropical Africa, returning northwards in March. Purple herons often overshoot their normal range on their return, and are vagrants to northern Europe including Britain. The eastern population is largely resident, though some birds from the northern part of the range fly southwards to Korea, Thailand and Malaysia. The African birds are resident. [10]

The purple heron inhabits marshes, lagoons and lakes surrounded by dense vegetation. It may frequent mangrove swamps on the coast but it usually chooses freshwater habitats, particularly locations with Phragmites reed beds. It also visits mudflats, river banks, ditches and canals. [5] In the Cape Verde Islands, it is more likely to be seen in the open, on arid slopes. [10]

Behaviour and ecology

juvenile A. p. purpurea, Danube delta, Romania Purple heron (Ardea purpurea) juvenile in flight Danube delta.jpg
juvenile A. p. purpurea, Danube delta, Romania
A. p. manilensis in North Sulawesi, Indonesia showing long toes Ardea purpurea manilensis.JPG
A. p. manilensis in North Sulawesi, Indonesia showing long toes
Egg, Collection Museum Wiesbaden Ardea purpurea MWNH 0894.JPG
Egg, Collection Museum Wiesbaden

Flight is slow, with the neck retracted and the legs extending a long way behind the tail. This is characteristic of herons and bitterns, and distinguishes them from storks, cranes and spoonbills, which extend their necks in flight. It is a secretive bird, spending less time out in the open than the grey heron and tending to skulk in reed beds. Its long toes mean it can walk on floating vegetation, and it sometimes walks over bushes in the same way, not making any attempt to grip the branches. It seldom perches in trees, preferring more terrestrial sites to rest. [5]

It is most active at dawn and dusk, roosting with other birds in the middle of the day and at night, but increasing its diurnal activity while rearing young. It feeds in shallow water, grabbing its prey with its powerful beak. It will often wait motionless for prey, or slowly stalk its victim. The diet consists mainly of fish, small mammals and amphibians, but nestling birds, snakes, lizards, crustaceans, water snails, insects and spiders are also eaten. Terrestrial beetles are the commonest insect prey, followed by water beetles and aquatic larvae, with grasshoppers, dragonflies, bees and flies also being consumed. [5]

The purple heron usually breeds in colonies but sometimes the nests are solitary. It sometimes associates with other species such as the goliath heron (Ardea goliath) or grey heron at multi-species nesting colonies. The site chosen is generally in reed beds, canebrakes or low bushes close to large lakes or other extensive wetlands. It builds a bulky nest of dead reeds, sticks or whatever is available, carelessly pulling the material together. The eggs are bluish-green, averaging 56 by 45 mm (2.2 by 1.8 in). The clutch is usually four or five eggs, with occasionally seven or eight eggs being laid, though these large clutches may have resulted from two females laying in the same nest. The eggs are laid at intervals of three days, and incubation may begin with the first egg, or start when the clutch is complete. Both parents share the incubation, which lasts between 24 and 28 days, and the care of the young. When an adult brings food, its beak is dragged down by the chicks and it regurgitates food from the crop onto the nest, or the young may take food directly from the beak. The young fledge at about six weeks and become independent at two months. They then disperse widely. [5]

Status

Watercolour illustration of Ardea purpurea Linnaeus: purple heron Ardea purpurea Linnaeus purple heron - Ann Lee - 107-1973-3.jpg
Watercolour illustration of Ardea purpurea Linnaeus: purple heron

The global purple heron population was estimated to comprise 180,000 to 380,000 individuals as of 2019, and the population is probably decreasing; it has therefore been assessed as least concern on the IUCN Red List. The chief threat is drainage and disturbance of wetland habitats, particularly destruction of reed beds. [1] The purple heron is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. [11]

Related Research Articles

<span class="mw-page-title-main">Eurasian bittern</span> Species of bird

The Eurasian bittern or great bittern is a wading bird in the bittern subfamily (Botaurinae) of the heron family Ardeidae. There are two subspecies, the northern race breeding in parts of Europe and across the Palearctic, as well as on the northern coast of Africa, while the southern race is endemic to parts of southern Africa. It is a secretive bird, seldom seen in the open as it prefers to skulk in reed beds and thick vegetation near water bodies. Its presence is apparent in the spring, when the booming call of the male during the breeding season can be heard. It feeds on fish, small mammals, fledgling birds, amphibians, crustaceans and insects.

<span class="mw-page-title-main">Heron</span> Family of birds

Herons are long-legged, long-necked, freshwater and coastal birds in the family Ardeidae, with 74 recognised species, some of which are referred to as egrets or bitterns rather than herons. Members of the genus Botaurus are referred to as bitterns, and, together with the zigzag heron, or zigzag bittern, in the monotypic genus Zebrilus, form a monophyletic group within the Ardeidae. Egrets do not form a biologically distinct group from herons, and tend to be named differently because they are mainly white or have decorative plumes in breeding plumage. Herons, by evolutionary adaptation, have long beaks.

<span class="mw-page-title-main">Grey heron</span> Long-legged predatory wading bird

The grey heron is a long-legged wading bird of the heron family, Ardeidae, native throughout temperate Europe and Asia, and also parts of Africa. It is resident in much of its range, but some populations from the more northern parts migrate southwards in autumn. A bird of wetland areas, it can be seen around lakes, rivers, ponds, marshes and on the sea coast. It feeds mostly on aquatic creatures which it catches after standing stationary beside or in the water, or stalking its prey through the shallows.

<span class="mw-page-title-main">Great egret</span> Species of bird

The great egret (Ardea alba), also known as the common egret, large egret, or great white egret or great white heron, is a large, widely distributed egret. The four subspecies are found in Asia, Africa, the Americas, and southern Europe. Recently, it has also been spreading to more northern areas of Europe. Distributed across most of the tropical and warmer temperate regions of the world, it builds tree nests in colonies close to water.

<span class="mw-page-title-main">Little egret</span> Species of water bird

The little egret is a species of small heron in the family Ardeidae. It is a white bird with a slender black beak, long black legs and, in the western race, yellow feet. As an aquatic bird, it feeds in shallow water and on land, consuming a variety of small creatures. It breeds colonially, often with other species of water birds, making a platform nest of sticks in a tree, bush or reed bed. A clutch of three to five bluish-green eggs is laid and incubated by both parents for about three weeks. The young fledge at about six weeks of age.

<span class="mw-page-title-main">Slender-billed gull</span> Species of bird


The slender-billed gull is a mid-sized gull which breeds very locally around the Mediterranean and the north of the western Indian Ocean on islands and coastal lagoons. Most of the population is somewhat migratory, wintering further south to as far as North Africa and India. A few birds have wandered to western Europe. A vagrant individual was reportedly seen on Antigua, April 24, 1976.

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<span class="mw-page-title-main">Western reef heron</span> Species of bird

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<span class="mw-page-title-main">Black-headed heron</span> Species of bird

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<span class="mw-page-title-main">White-faced heron</span> Species of bird

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<span class="mw-page-title-main">Cinnamon bittern</span> Species of bird

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<span class="mw-page-title-main">Humblot's heron</span> Species of bird

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<span class="mw-page-title-main">White-necked heron</span> Species of bird

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<span class="mw-page-title-main">Cocoi heron</span> Species of bird

The cocoi heron is a species of long-legged wading bird in the heron family Ardeidae found across South America. It has predominantly pale grey plumage with a darker grey crest. A carnivore, it hunts fish and crustaceans in shallow water.

Bourne's heron, also known as the Cape Verde heron, Cape Verde purple heron or Santiago heron, or locally in Portuguese as the garça vermelha, is an endangered subspecies of the purple heron that is endemic to the Cape Verde archipelago, in the Atlantic Ocean off the coast of West Africa. It is sometimes considered a full species, Ardea bournei.

References

  1. 1 2 BirdLife International (2019). "Ardea purpurea". IUCN Red List of Threatened Species . 2019: e.T22697031A154816177. doi: 10.2305/IUCN.UK.2019-3.RLTS.T22697031A154816177.en . Retrieved 11 November 2021.
  2. "Purple heron videos, photos and facts – Ardea purpurea". ARKive. Archived from the original on 2011-10-16. Retrieved 18 October 2011.
  3. Ali, S. (1996). The Book of Indian Birds. Bombay: Bombay Natural History Society. ISBN   978-0-19-563731-1.
  4. Dunning Jr., John B., ed. (1992). CRC Handbook of Avian Body Masses. CRC Press. ISBN   978-0-8493-4258-5.
  5. 1 2 3 4 5 6 Witherby, H. F., ed. (1943). Handbook of British Birds, Volume 3: Hawks to Ducks. H. F. and G. Witherby Ltd. pp. 133–137.
  6. Gill, F.; Donsker, D., eds. (2015). IOC World Bird List (version 5.3) (Report). doi: 10.14344/IOC.ML.5.3 . Retrieved 25 August 2015.
  7. 1 2 de By, R.A. "Cape Verde Purple Heron". Recent proposals for specifically distinct bird species: Herons. Bird Taxonomy for Birders.
  8. "ITIS - Report: Ardea purpurea manilensis".
  9. Jobling, J. A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 54, 325. ISBN   978-1-4081-2501-4.
  10. 1 2 3 Hancock, J.; Kushlan, J. A. (2010). The Herons Handbook. Bloomsbury Publishing. pp. 108–110. ISBN   978-1-4081-3496-2.
  11. "AEWA Species". Agreement on the Conservation of African-Eurasian Migratory Waterbirds. Retrieved 23 October 2015.