Overview

Comprehensive Description

Description

The distinctively spatulate bill of the Eurasian spoonbill lends this tall, pure white waterbird a slightly comical appearance. During the breeding season, adults develop a crest of pointed and drooping plumes, as well as patches of yellow on the upper breast and the tip of the bill. The rest of the bill is black, as are the long legs. The sexes are similar in overall appearance but the male is somewhat larger than the female, with a longer bill and longer legs. Juveniles resemble the non-breeding adults, but have pinkish bills and black tips to the wing feathers.

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Distribution

Global Distribution

The wide but fragmented breeding range of the Eurasian spoonbill extends from Europe to northwest Africa, the Red Sea, India and China. Wintering areas include the Atlantic coast of Europe, the Mediterranean, sub-Saharan Africa, southwest Asia, India, Sri Lanka, southern China, and Japan.

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Physical Description

Size

Size

Length: 70 - 95 cm. Weight: 1130 - 1960 g.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Behaviour Palearctic breeding populations are fully migratory1 but may only travel short distances4 while other populations are resident and nomadic or partially migratory1. In the north of its range the species breeds in the local spring (e.g. from April) but in the tropics the timing of breeding coincides with the rains1. The species usually nests in monospecific colonies or in small monospecific groups amidst mixed-species colonies1. When not breeding the species forages singly or in small flocks1 of up to 100 individuals2 and migrates in flocks of up to 100 individuals (Africa)3, 4. It is most active during the morning and evening (although in coastal areas it forages at low tide regardless of the time of day)2, and often roosts communally up to 15 km away from feeding areas3. Habitat The species shows a preference for extensive shallow1 (less than 30 cm deep) wetlands with mud, clay or fine sand substrates, generally avoiding waters with rocky substrates, thick vegetation or swift currents2. It inhabits either fresh, brackish or saline2, 4 marshes, rivers, lakes, flooded areas and mangrove swamps, especially those with islands for nesting or dense emergent vegetation (e.g. reedbeds) and scattered trees or srubs1 (preferably willow Salix spp., oak Quercus spp. or poplar Populus spp.)2. It may also frequent sheltered marine habitats during the winter such as deltas, estuaries, tidal creeks and coastal lagoons1, 2. Diet Its diet consists of adult and larval insects (e.g. waterbeetles, dragonflies, caddisflies, locusts and flies), molluscs, crustaceans, worms, leeches, frogs, tadpoles and small fish1 up to 10-15 cm long2. It may also take algae or small fragments of aquatic plants1 (although these are possibly ingested accidentally with animal matter)2. Breeding site The nest is a platform of sticks and vegetation constructed on the ground on islands in lakes and rivers, or alternatively in dense stands of emergent vegetation (e.g. reedbeds)1, bushes, mangroves or deciduous trees (e.g. willow Salix spp., oak Quercus spp. or poplar Populus spp.)2 up to 5 m above the ground1. The species nests in colonies within which neighbouring nests are usually placed 1-2 m apart or touching2. Breeding colonies are sited within 10-15 km of feeding areas, often much less (although the species may also feed up to 35-40 km away)2.

Systems
  • Terrestrial
  • Freshwater
  • Marine
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Habitat

The Eurasian spoonbill inhabits fresh and saltwater marshes, estuaries, deltas, tidal creeks, rivers, lakes, reservoirs and mangrove swamps. It shows a particular preference for shallow wetlands with a mud, clay or fine sand bottom, as well as islands, dense reedbeds, and scattered trees and shrubs for nesting.

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Life History and Behavior

Behavior

Behaviour

The Eurasian spoonbill forages alone or in small groups, wading methodically through shallow water whilst sweeping its distinctive bill from side to side in search of prey. Small fish, aquatic insects, shrimp and other invertebrates comprise the bulk of its diet, but it will also take algae and fragments of aquatic plants, although these may just be accidentally ingested. Foraging activity generally peaks around morning and evening, except in coastal areas, where it is governed by the timing of low tide.

Populations in the north of this species’ range breed during the spring, whilst in the tropics the timing of the breeding season coincides with the rains. Most breeding pairs nest in monospecific colonies, or mixed species colonies in which they tend to form small monospecific groups. The nest is a platform of twigs, sticks and other bits of vegetation located on the ground on a small island, or up to five metres above the ground in dense reed, bushes, trees or mangroves. The female usually lays three to four eggs which are incubated for around 24 to 25 days before hatching.

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Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 30.1 years (captivity) Observations: One specimen lived for 30.1 years in captivity (Brouwer et al. 1994).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Platalea leucorodia

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 2
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). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds 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 species is threatened by habitat degradation through drainage and pollution1 (e.g. chlorinated hydrocarbons)2, and is especially affected by the disappearance of reed swamps due to agricultural and hydroelectric development2. Over-fishing and disturbance have caused population declines in Greece2, and human exploitation of eggs and nestlings for food has threatened the species in the past1, 2. The species is also susceptible to avian influenza so may be threatened by future outbreaks of the virus5.
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Wikipedia

Eurasian Spoonbill

The Eurasian Spoonbill or Common Spoonbill (Platalea leucorodia) is a wading bird of the ibis and spoonbill family Threskiornithidae,

Contents

Distribution

This is a Palearctic species, breeding from the United Kingdom and Spain in the west through to Japan, and also in North Africa. In Europe, only The Netherlands, Spain, Austria, Hungary and Greece have sizeable populations.[1] Most birds migrate to the tropics in winter, with European breeders mainly going to Africa, but a few remaining in mild winter areas of western Europe south to the United Kingdom. It was extirpated from the United Kingdom but sporadic breeding attempts in the early 21st Century culminated with the formation of a colony at Holkham in Norfolk in 2010. In 2011, 8 breeding pairs nested, successfully fledging 14 young.[2]

Description

This species is almost unmistakable in most of its range. The breeding bird is all white except for its dark legs, black bill with a yellow tip, and a yellow breast patch like a pelican. It has a crest in the breeding season. Non-breeders lack the crest and breast patch, and immature birds have a pale bill and black tips to the primary flight feathers. Unlike herons, spoonbills fly with their necks outstretched.

The Eurasian Spoonbill differs from the African Spoonbill with which in overlaps in winter, in that the latter species has a red face and legs, and no crest.

Taxonomy

A study of mitochondrial DNA of the spoonbills found that the Eurasian Spoonbill is sister taxon to a clade containing the Royal and Black-faced Spoonbills.[3]

The Eurasian Spoonbill has three subspecies:

  • P. l. leucorodia, the nominate race, occupies all the range except as below.
  • P. l. balsaci. Islands off the Banc d'Arguin, Mauritania.
  • P. l. archeri. The coasts of the Red Sea and Somalia.

Birds in Asia are sometimes separated as P. l. major

Habitat

Eurasian Spoonbills show a preference for extensive shallow, wetlands with muddy, clay or fine sandy beds. They may inhabit any type of marsh, river, lake, flooded area and mangrove swamp, whether fresh, brackish or saline, but especially those with islands for nesting or dense emergent vegetation (e.g. reedbeds) and scattered trees or srubs (especially willow Salix spp., oak Quercus spp. or poplar Populus spp.). Eurasian Spoonbills may also frequent sheltered marine habitats during the winter such as deltas, estuaries, tidal creeks and coastal lagoons.[4]

Diet

The diet consists of adult and larval aquatic insects, molluscs, crustaceans, worms, leeches, frogs, tadpoles and small fish up to 10–15 cm long. It may also take algae or small fragments of aquatic plants (although these are possibly ingested accidentally with animal matter).[4]

Behaviour

More northerly breeding populations are fully migratory but may only migrate short distances while other, more southerly populations are resident and nomadic or partially migratory. In the Palearctic the species breeds in spring (e.g. from April) but in tropical parts of its range it times breeding to coincide with rainfall. Breeding is normally in single species colonies or in small single species groups amidst mixed-species colonies of other waterbirds such as herons, egrets and cormorants. Outside the breeding season Eurasian Spoonbills forage singly or in small flocks of up to 100 individuals. Migration is usually conducted in flocks of up to 100 individuals. Most activity takes place during the morning and evening (although in coastal areas it foraging is governed by tidal ryhthms), they often roost communally in roosts which are up to 15 km away from the feeding areas.[4]

Nestlings

The nest is a platform of sticks and vegetation which is either constructed on the ground on islands in lakes and rivers or in dense stands of reeds, bushes, mangroves or deciduous trees up to 5 m above the ground1. Within colonies neighbouring nests are usually quite close together, no more than 1 or 2m apart. Breeding colonies are normally sited within 10–15 km of feeding areas, often much less (although the species may also feed up to 35–40 km away).[4]

Conservation

Threats to the Eurasian Spoonbill include habitat destruction by drainage and degradation by pollution, It is especially adversely affected by the disappearance of reed swamps. In Greece over-fishing and disturbance have caused the population to decline, and human exploitation of eggs and nestlings for food has threatened the species in the past.[4] As stated above it has recently started to breed in the United Kingdom from where it was extirpated in the 17th Century.[5]

Gallery

Notes

  1. ^ Overdijk 2002, p. 88
  2. ^ http://www.naturalengland.org.uk/about_us/news/2011/120911.aspx
  3. ^ Chesser, R.Terry; Yeung, Carol K.L.; Yao, Cheng-Te; Tians, Xiu-Hua; Li Shou-Hsien (2010). "Molecular phylogeny of the spoonbills (Aves: Threskiornithidae) based on mitochondrial DNA". Zootaxa (2603): 53–60. ISSN 1175-5326. 
  4. ^ a b c d e http://www.iucnredlist.org/apps/redlist/details/106003802/0
  5. ^ http://www.independent.co.uk/environment/spoonbills-return-to-breed-in-the-uk-after-300-years-710261.html

References and external links

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