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Overview

Brief Summary

The colonially nesting Roseate Spoonbill (Platalea ajaja) is a medium-sized, pink-bodied, ibis-like bird with a flat spatula-shaped bill. These birds are found in the southeastern United States and West Indies through Mexico and Central America to South America, where they are distributed south to northern Argentina east of the Andes and western Ecuador and northwestern Peru west of the Andes. They are uncommon to locally common throughout their extensive range. Throughout much of their range, the species is apparently declining as a result of habitat alteration, hunting, and pollution. In the United States, Roseate Spoonbills were common along the Gulf Coast in the early 19th Century, but were almost exterminated in the 1930s by intense persecution and destruction of wading bird colonies for the plume trade starting in the 1880s. They were legally protected in the 1940s, after which populations recovered somewhat, but declines apparently followed later in the 20th century as a consequence of mosquito control programs and alteration of breeding and feeding habitats.

These highly gregarious waders often feed by sweeping the bill side to side, sifting through mud as they walk through shallow water. Their diet includes small fishes and aquatic invertebrates, as well as some plant material. They are found in coastal marshes, lagoons, mudflats, and mangrove keys, foraging in both salt and fresh water. Flocks typically include fewer than half a dozen individuals, but they are often associated with other wading birds as well. In courtship, male and female spoonbills first interact aggressively, then perch close together, presenting sticks to each other and crossing and clasping bills. They typically nest in mangroves or other trees and shrubs 5 to 15 feet above ground or water, but sometimes nest on the ground. The nest, a bulky platform of sticks with a deep twig- and leaf-lined center, is built mainly by the female with material brought by the male. Clutch size is 2 to 3 eggs (range 1 to 5). The white eggs are spotted with brown. Eggs are incubated (by both sexes) for 22 to 24 days. Both parents feed the young. Young may leave the nest after 5 to 6 weeks and are capable of strong flight at around 7 to 8 weeks. Roseate Spoonbills are mostly silent, but make a soft frog-like croak when disturbed.

(Matheu and del Hoyo 1992; Kaufman 1996; AOU 1998; Dunne 2006)
  • Matheu, E. and J. del Hoyo. 1992. Family Threskiornithidae (Ibises and Spoonbills) P. 506 in: del Hoyo, J., A. Elliott, and J. Sargatal, eds. Handbook of the Birds of the World. Vol. 1. Lynx Edicions, Barcelona.
  • Kaufman, K. 1996. Lives of North American Birds. Houghton Mifflin, Boston.
  • American Ornithologists’ Union. 1998. Check-list of North American Birds, 7th edition. American Ornithologists’ Union, Washington, D.C.
  • Dunne, P. 2006. Pete Dunne’s Essential Field Guide Companion. Houghton Mifflin, Boston.
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The colonially nesting Roseate Spoonbill (Platalea ajaja) is a medium-sized, pink-bodied, ibis-like bird with a flat spatula-shaped bill. These birds are found in the southeastern United States and West Indies through Mexico and Central America to South America, where they are distributed south to northern Argentina east of the Andes and in western Ecuador and northwestern Peru west of the Andes. They are uncommon to locally common throughout their extensive range. Throughout much of their range, the species is apparently declining as a result of habitat alteration, hunting, and pollution. In the United States, Roseate Spoonbills were common along the Gulf Coast in the early 19th Century, but were almost exterminated in the 1930s by intense persecution and destruction of wading bird colonies for the plume trade starting in the 1880s. They were legally protected in the 1940s, after which populations recovered somewhat, but declines apparently followed later in the 20th century as a consequence of mosquito control programs and alteration of breeding and feeding habitats.

These highly gregarious waders feed by sweeping the bill side to side, often sifting through mud as they walk through shallow water. Their diet includes small fishes and aquatic invetebrates, as well as some plant material. They are found in coastal marshes, lagoons, mudflats, and mangrove keys, foraging in both salt and fresh water. Flocks typically include fewer than half a dozen individuals, but they are often associated with other wading birds as well. In courtship, male and female spoonbills first interact aggressively, then perch close together, presenting sticks to each other and crossing and clasping bills. They typically nest in mangroves or other trees and shrubs 5 to 15 feet above ground or water, but sometimes nest on the ground. The nest, a bulky platform of sticks with a deep twig- and leaf-lined center, is built mainly by the female with material brought by the male, Clutch size is 2 to 3 eggs, (range 1 to 5). The white eggs are spotted with brown. Eggs are incubated (by both sexes) for 22 to 24 days. Both parents feed the young. Young may leave the nest after 5 to 6 weeks and are capable of strong flight at around 7 to 8 weeks. .Roseate Spoonbils are mostly silent, but make a soft froglike croak when disturbed.

(Matheu and del Hoyo 1992; Kaufman 1996; AOU 1998; Dunne 2006)
  • American Ornithologists’ Union. 1998. Check-list of North American Birds, 7th edition. American Ornithologists’ Union, Washington, D.C.
  • Dunne, P. 2006. Pete Dunne’s Essential Field Guide Companion. Houghton Mifflin, Boston.Kaufman, K. 1996. Lives of North American Birds. Houghton Mifflin, Boston.
  • Matheu, E. and J. del Hoyo. 1992. Family Threskiornithidae (Ibises and Spoonbills) P. 506 in: del Hoyo, J., A. Elliott, and J. Sargatal, eds. Handbook of the Birds of the World. Vol. 1. Lynx Edicions, Barcelona.
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Distribution

Geographic Range

Roseate spoonbills occur from southern Georgia and Florida, south through Central American, the Caribbean, and South America to Argentina.

Biogeographic Regions: nearctic (Native ); neotropical (Native )

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Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) Resident locally from northern Sinaloa, Gulf coast of Texas and Louisiana, and southern Florida (as far north as Tampa Bay on Gulf Coast) south locally along both coasts of Middle America and through Greater Antilles, and Bahamas to Uruguay, central Chile, and central Argentina. About 80% of U.S. breeders occur in southern Florida (24%) and eastern Texas and southwestern Louisiana (46%) (Spendelow and Patton 1988). In the U.S., the highest winter densities occur on the Gulf coast of Texas and western Louisiana and in southern Florida (Root 1988). Wanders outside usual range.

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occurs (regularly, as a native taxon) in multiple nations

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Physical Description

Morphology

Physical Description

The upper neck and back of the Roseate Spoonbill are white. The wings and the under parts are a shade of light rose. The wings and the tail coverts are a deep carmine. The legs and the iris are red in color. Parts of the Spoonbills head is a distinct yellow-green. The most distinctive feature on the Spoonbill, is the spoon-like bill itself. The bill, which is spoon-like in shape from birth, flattens out at the end to aid in feeding. The Spoonbill is about 32" in length.

Average mass: 1036.97 g.

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Size

Length: 81 cm

Weight: 1496 grams

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Diagnostic Description

No other large wading bird in the New World has a spatulate bill.

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Ecology

Habitat

Habitat and Ecology

Systems
  • Terrestrial
  • Freshwater
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Habitat

Roseate spoonbills are usually found in marsh like areas, especially mangrove swamps and mud flats. Spoonbills create large, deep, well-constructed nests out of sticks, much like the nests of herons, in mangrove trees.

Habitat Regions: temperate ; terrestrial ; saltwater or marine ; freshwater

Aquatic Biomes: brackish water

Wetlands: marsh

Other Habitat Features: estuarine

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Comments: Marshes, swamps, ponds, rivers, and lagoons (AOU 1983); also tidal flats. Seems to prefer brackish waters and coastal bays in Florida and Texas, freshwater marshes in Louisiana (Spendelow and Patton 1988). Wherever shallow, open, still or slow-flowing water occurs (Stiles and Skutch 1989). Nests in mangroves (e.g., Florida), in low bushes along coastal islands and on ground on treeless spoil banks along waterways (e.g., Texas and Louisiana).

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Migration

Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.

Locally Migrant: Yes. At least some populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Some birds migrate between Texas-Louisiana and Mexico and between Florida and Cuba. In Costa Rica, pronounced seasonal movements reflect changes in water level (Stiles and Skutch 1989).

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Trophic Strategy

Food Habits

The Roseate Spoonbill feeds in a special way. It uses its spoon-like bill to scoop various things from shallow water. By swishing the bill back and forth in the water, the Spoonbill is able to pick up minnows, small crustaceans, bits of plants and insects. The Spoonbill usually feeds in shallow, muddy water, usually found around its marshy or mangrove infested environment. While feeding, Spoonbills utter a low, gutteral sound.

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Comments: Eats small fishes, crustaceans, mollusks, aquatic insects; forages in shallow water (Palmer 1962); sometimes stirs up bottom mud with feet to flush prey.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 81 to >300

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Global Abundance

10,000 to >1,000,000 individuals

Comments: Coastal U.S. breeding population: Florida coast = 1500, Gulf Coast = about 4200 (Spendelow and Patton 1988).

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General Ecology

Gregarious; usually feeds, roosts and nests in groups or flocks (Stiles and Skutch 1989).

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Life History and Behavior

Cyclicity

Comments: Forages primarily at night but also during daylight in Florida Bay (Powell 1987).

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Life Expectancy

Lifespan/Longevity

Range lifespan

Status: wild:
28 (high) years.

Average lifespan

Status: wild:
190 months.

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Lifespan, longevity, and ageing

Maximum longevity: 28 years
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Reproduction

Reproduction

Average time to hatching: 23 days.

Average eggs per season: 3.

Average age at sexual or reproductive maturity (male)

Sex: male:
1095 days.

Average age at sexual or reproductive maturity (female)

Sex: female:
1095 days.

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Clutch size usually is 2-3. Incubation lasts 23-24 days, by both sexes. Young are tended by both parents, leave nest at 5-6 weeks, fly well at 7-8 weeks, fed until about the eighth week.

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Evolution and Systematics

Functional Adaptations

Functional adaptation

Bill used to filter: roseate spoonbill
 

The long, spatulate bill of the roseate spoonbill aids in filter feeding as it is swept, partially open, from side to side in the water.

   
  "The roseate spoonbill has a slightly specialized bill. As it feeds, it sweeps its partly open bill from side to side, filtering crustaceans from the water." (Foy and Oxford Scientific Films 1982:157)
  Learn more about this functional adaptation.
  • Foy, Sally; Oxford Scientific Films. 1982. The Grand Design: Form and Colour in Animals. Lingfield, Surrey, U.K.: BLA Publishing Limited for J.M.Dent & Sons Ltd, Aldine House, London. 238 p.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Platalea ajaja

The following is a representative barcode sequence, the centroid of all available sequences for this species. 

 
There are 4 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.
 
KBARG024-07|MACN-Or-ct 1761|Platalea ajaja| ------------------------------------------CTGTACCTAATTTTCGGCGCATGAGCTGGCATAGTTGGAACCGCACTC---AGTCTACTCATCCGTGCAGAACTAGGCCAACCAGGAACACTCCTAGGAGAC---GACCAAATCTACAACGTAATCGTCACAGCCCATGCCTTCGTAATAATTTTCTTTATAGTAATACCAATCATAATTGGTGGGTTTGGCAACTGACTAGTCCCACTTATA---ATTGGTGCACCCGACATAGCATTCCCACGTATAAACAACATAAGCTTCTGACTATTGCCCCCCTCATTCTTACTCCTTCTAGCTTCATCCACAGTAGAAGCAGGGGCGGGTACTGGATGAACCGTATACCCACCACTCGCTGGCAACCTCGCCCACGCCGGAGCCTCAGTTGACCTG---GCCATCTTCTCACTTCACCTAGCAGGTGTGTCATCCATCTTAGGGGCAATCAACTTTATCACAACTGCCATCAATATAAAACCACCAGCCCTTTCACAATACCAAACGCCCCTGTTCGTCTGATCAGTCCTAATTACTGCCGTCCTACTGCTACTCTCACTACCGGTCCTCGCTGCC---GGCATCACCATGCTACTAACAGACCGAAACCTAAACACCACATTCTTCGACCCAGCCGGAGGAGGAGACCCAGTCCTATACCAGCACCTATTCTGATTCTTCGGCCACCCAGAAGTTTACATTCTAATCCTG------------------------------------------------------------------------------------------------------------------------------------------------------- 
-- end --

Download FASTA File
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Statistics of barcoding coverage: Platalea ajaja

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Species: 5
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 appears to be stable, and hence the species does not 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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Conservation Status

In the middle of the century, Roseate Spoonbills were heavily hunted for their brilliant and distinct red colored feathers. In recent years however, the Spoonbill has come back strong in certain isolated areas. Now, the main threat to the continuation of the species is the destruction of natural habitat. More and more shallow water habitats are being destroyed everyday. The survival of the Spoonbill depends on the survival of its habitat.

US Federal List: no special status

CITES: no special status

IUCN Red List of Threatened Species: least concern

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National NatureServe Conservation Status

United States

Rounded National Status Rank: N4 - Apparently Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

Reasons: Very large range, locally fairly common. Secure on a global basis, but regional trends are unknown for most areas.

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Threats

Degree of Threat: C : Not very threatened throughout its range, communities often provide natural resources that when exploited alter the composition and structure over the short-term, or communities are self-protecting because they are unsuitable for other uses

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Relevance to Humans and Ecosystems

Benefits

Economic Importance for Humans: Positive

The Roseate Spoonbill is a species found mainly in Florida. Many avid bird watchers come to Florida to see this beautiful creature. This attraction, therefore, helps the economy. The feathers of the bird were heavily sought after in the middle of the century, but this practice has died out, due to the fact that the species almost became extinct.

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Wikipedia

Roseate Spoonbill

The Roseate Spoonbill, Platalea ajaja, (sometimes placed in its own genus Ajaja) is a gregarious wading bird of the ibis and spoonbill family, Threskiornithidae. It is a resident breeder in South America mostly east of the Andes, and in coastal regions of the Caribbean, Central America, Mexico, and the Gulf Coast of the United States.[1][2]

Contents

Taxonomy

A 2010 study of mitochondrial DNA of the spoonbills by Chesser and colleagues found that the Roseate and Yellow-billed Spoonbills were each others' closest relative, and the two were descended from an early offshoot from the ancestors of the other four spoonbill species. They felt the genetic evidence meant it was equally valid to consider all six to be classified within the genus Platalea or alternatively the two placed in the monotypic genera Platibis and Ajaja respectively. However, as the six species were so similar morphologically, keeping them within the one genus made more sense.[3]

Description

Roseate Spoonbill High Island, Texas

The Roseate Spoonbill is 71–86 cm (28–34 in) long, with a 120–133 cm (47–52 in) wingspan and a body mass of 1.2–1.8 kg (2.6–4.0 lb).[4] The tarsus measures 9.7–12.4 cm (3.8–4.9 in), the culmen measures 14.5–18 cm (5.7–7.1 in) and the wing measures 32.3–37.5 cm (12.7–14.8 in) and thus the legs, bill, neck and spatulate bill all appear elongated.[5] Adults have a bare greenish head ("golden buff" when breeding[6]) and a white neck, back, and breast (with a tuft of pink feathers in the center when breeding), and are otherwise a deep pink. The bill is grey. There is no significant sexual dimorphism.

Like the American Flamingo, their pink color is diet-derived, consisting of the carotenoid pigment canthaxanthin. Another carotenoid, astaxanthin, can also be found deposited in flight and body feathers.[7] The colors can range from pale pink to bright magenta, depending on age and location. Unlike herons, spoonbills fly with their necks outstretched. They alternate groups of stiff, shallow wingbeats with glides.[8]

Behavior

This species feeds in shallow fresh or coastal waters by swinging its bill from side to side as it steadily walks through the water, often in groups. The spoon-shaped bill allows it to sift easily through mud. It feeds on crustaceans, aquatic insects, frogs, newts and very small fish ignored by larger waders. In the United States a popular place to observe Roseate Spoonbills is "Ding" Darling National Wildlife Refuge in Florida. Roseate Spoonbills must compete for food with Snowy Egrets, Great Egrets, Tricolored Herons, and American White Pelicans.

Reproduction

An adult with two juveniles on a nest

The Roseate Spoonbill nests in shrubs or trees, often mangroves, laying 2 to 5 eggs, which are whitish with brown markings.[8] Immature birds have white, feathered heads, and the pink of the plumage is paler. The bill is yellowish or pinkish.

Threats

Information about predation on adults is lacking. Nestlings are sometimes killed by turkey vultures, bald eagles, raccoons, and fire ants.[2] In 2006, a 16-year-old banded bird was discovered, making it the oldest wild individual.[9]

References

  1. ^ "Roseate Spoonbill". Waterbird Conservation. National Audubon Society. Archived from the original on 2008-10-24. http://web.archive.org/web/20081024171610/http://web1.audubon.org/waterbirds/species.php?speciesCode=rosspo. Retrieved 2009-07-23. 
  2. ^ a b Dumas, Jeannette V. 2000. Roseate Spoonbill (Platalea ajaja), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology. Retrieved 2009-11-12. Subscription required
  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. ^ [1] (2011).
  5. ^ Hancock, Kushlan & Kahl (1992). Storks, Ibises, and Spoonbills of the World. Academic Press. ISBN 978-0-12-322730-0. 
  6. ^ Howell, SNG; Webb, S (1995). A Guide to the Birds of Mexico and Northern Central America. Oxford University Press. pp. 147–8. ISBN 0-19-854012-4. 
  7. ^ Brush, A. H. 1990. Metabolism of cartenoid pigments in birds. The FASEB Journal. 4:2969-2977.
    Fox, D. L. 1962. Carotenoids of the Roseate Spoonbill. Comparative Biochemistry and Physiology 6:305-310.
    (Mentioned in the Cornell Lab of Ornithology page).
  8. ^ a b Howell, SNG; Webb, S (1995). A Guide to the Birds of Mexico and Northern Central America. Oxford University Press. pp. 147–8. ISBN 0-19-854012-4 
  9. ^ "Researchers: Oldest Wild Spoonbill Found - Care2 News Network". Care2.com. 2006-05-29. http://www.care2.com/news/member/194953321/88664. Retrieved 2012-02-20. 
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Names and Taxonomy

Taxonomy

Comments: Formerly placed in the genus Ajaia. AOU (2002) recommended merging Ajaia into Platalea, although the evidence is disputable.

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