Overview

Comprehensive Description

Description

Despite its English common name, the purple heron actually has a chestnut-red head and neck with striking vertical black stripes, grey shoulders and outer-wings, and a rich chestnut stomach and inner-wings. The Spanish name for the purple heron is garza imperial, which translates as the ‘imperial heron’, perhaps a more suitable name for this vibrant-looking species. Its regal appearance is emphasized by the elongated golden-ochre beak, proportionally larger than most species of its genus . Its kinked, snake-like neck is coiled into an s-shape when in flight, and with longer toes than other similar species, the purple heron can wade over floating vegetation with ease. Although both sexes are similar in appearance, the female is lighter than the male. The juvenile heron is duller, with beige and brown chest, and it lacks the neck stripes and the extended plumage of the adult.

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Distribution

Global Distribution

The purple heron is common throughout southern and eastern Europe, central and southern Asia, and Africa.

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Physical Description

Size

Size

Length: 78 – 90 cm. Wingspan: 120 – 150 cm. Weight : 525 – 1345 g.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Behaviour Populations breeding in the western Palearctic are migratory1 and travel on a broad front between breeding and wintering grounds2. African and tropical-Asian populations are largely sedentary however, occasionally making local dispersive movements1. The species breeds from April to June in the western Palearctic, during the rains in Africa, and from June to October in the north of India or November to March in the south of India1. It is a colonial breeder1, 2, 3, 4 and although nesting group sizes are usually small (e.g. 2-3 pairs per colony in Africa) and rarely exceed 50 pairs3, colonies of up to 1,000 pairs have been recorded in some areas1, 4. It often also nests on the periphery of colonies of other heron species such as Grey Ardea cinerea2. In migratory populations the autumn migration occurs from August to October4, with the return passage in the spring beginning in March4. On migration the species commonly occurs in small groups (the maximum recorded migratory groups sizes being 300-400 individuals)1 and throughout the year it will roost communally by day and by night4 in groups of up to 100 individuals5 although it generally feeds solitarily1, 4. The species is mainly crepuscular, but may also feed diurnally1. Habitat The species inhabits wetlands from sea level to 1,800 m (Madagascar)1, showing a preference for dense, flooded, freshwater reedbeds (Phragmites spp.) in temperate areas (occupying Typha, Scirpus and Papyrus swamps elsewhere)2. It also utilises lake shores, river margins1, ditches, canals, brackish water lagoons2, rice-fields, mangroves and coastal mudflats1. Diet Its diet consists of fish 5-15 cm long1 (occasionally up to 55 cm), salamanders2, frogs, insects1 (e.g. beetles, dragonflies, hemiptera2 and locusts4), crustaceans1, spiders2 and molluscs4 as well as small birds and mammals, snakes and lizards1. Breeding site The nest is a platform of reeds stems or sticks2 positioned over or beside water up to 3 m high in flooded reedbeds1, 3-4 m high in thickets or mangroves2 or up to 25 m high in trees1. The species usually nests in loose single- or mixed-species colonies with Grey Ardea cinerea, and although colony sizes are usually small, large groups of up to 1,000 pairs have been recorded1, 4 (the colony size depends on the size of the area of marshland)2. Management information Studies in southern France have shown that the overall conservation of this species in Europe is favoured by maintaining large uncut reedbeds with relatively high spring water levels7.

Systems
  • Terrestrial
  • Freshwater
  • Marine
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Habitat

The purple heron inhabits wetland habitat such as swamps, reed-beds, rice-fields, and lake shores. It is found from sea-level up to an altitude of about 1,800 metres.

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Associations

Associations

In Great Britain and/or Ireland:
Animal / parasite / ectoparasite
imago of Icosta ardeae ectoparasitises Ardea purpurea

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Life History and Behavior

Behavior

Behaviour

Usually feeding at dusk or dawn, the purple heron has a very varied diet consisting of fish, salamanders, frogs, insects, crustaceans, spiders, molluscs, small birds, mammals, snakes and lizards. It hunts by hiding in vegetation and waiting motionless until prey approaches.

Populations breeding in Europe, the Middle East and North Africa are migratory and travel between breeding and wintering grounds. However, southern African and tropical Asian populations are non-migratory. The purple heron migrates by day, typically in small groups, although in Turkey it is known to migrate in large groups of 350 to 400 individuals. Purple herons often nest alongside other heron species, such as the grey heron, in groups that typically do not exceed 50 pairs; however, a colony of 1,000 pairs has been recorded. Between two and eight eggs are laid, which are incubated for 25 to 27 days, and the fledglings reach independence at around 45 to 50 days.

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Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 25.4 years (wild)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Ardea purpurea

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 1
Species With Barcodes: 1

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2009

Assessor/s
BirdLife International

Reviewer/s
Bird, J., Butchart, S.

Contributor/s

Justification
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

History
  • 2008
    Least Concern
  • 2004
    Least Concern
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Status in Egypt

Resident breeder, regular passage visitor and winter visitor.

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IUCN

Least Concern.

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Threats

Threats

Major Threats
The main threat to this species in Europe is the loss of reedbeds though direct elimination (to reduce sedimentation)2, agricultural encroachment6, water management practices2 (e.g. drainage)6 and reed cane harvesting2.
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Threats

Due to its huge range, the purple heron is not currently considered to be globally threatened. Populations, however, are reportedly declining, mainly as a result of human-induced factors. The loss of its wetland habitat due to agriculture, drainage, pesticide use and reed cane harvesting has caused concern about some localised populations. Also, many flocks of purple herons are migratory and so are sensitive to changes in both their breeding and wintering grounds.

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Wikipedia

Purple Heron

The Purple Heron (Ardea purpurea) is a wading bird in the heron family Ardeidae, breeding in Africa, central and southern Europe, and southern and eastern Asia. The European populations are migratory, wintering in tropical Africa; the more northerly Asian populations also migrate further south within Asia. It is a rare but regular wanderer north of its breeding range.

Contents

Description

The Purple Heron is a large bird, 78–90 cm (31–35 in) in length with a standing height of up to 94 cm (37 in) and a 120–152 cm (47–60 in) wingspan.[1] However, it is slender for its size, weighing only 0.5–1.35 kg (1.1–3.0 lb).[2] It is somewhat smaller than the Grey Heron, from which it can be distinguished by its darker reddish-brown plumage, and, in adults, darker grey back. It has a narrower yellow bill, which is brighter in breeding adults.

Taxonomy

There are three or four subspecies:

Behaviour

The Purple Heron breeds in colonies in reed beds or trees close to large lakes or other extensive wetlands. It builds a bulky stick nest.

It feeds in shallow water, spearing fish, frogs, insects and small mammals. It will often wait motionless for prey, or slowly stalk its victim. It tends to keep within reedbeds more than the Grey Heron, and is often inconspicuous, despite its size.

In flight in Kolkata, West Bengal, India.

It has a slow flight, with its neck retracted. This is characteristic of herons and bitterns, and distinguishes them from storks, cranes and spoonbills, which extend their necks. The long neck of Purple Heron looks particularly snake-like, with more of an S-shape in flight. The call is a loud croaking "krek".

The Purple Heron is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

References

  1. ^ "Purple heron videos, photos and facts - Ardea purpurea". ARKive. http://www.arkive.org/purple-heron/ardea-purpurea/#text=Facts. Retrieved 2011-10-18. 
  2. ^ CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.
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