Tropicbird

Last updated

Tropicbirds
Temporal range: Early Eocene to present
Red-billed Tropicbird (Phaethon aethereus) (4089464789).jpg
Red-billed Tropicbird
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Phaethontiformes
Family: Phaethontidae
Brandt, 1840
Genus: Phaethon
Linnaeus, 1758
Type species
Phaethon aethereus (red-billed tropicbird)
Linnaeus, 1758
Species
Synonyms [1]
  • LeptophaethonMathews 1913
  • LepturusMoehring 1752 nom rej.
  • LepturusBrisson 1760
  • ScaeophaethonMathews 1913
  • PhoenicurusBonaparte 1855 non Forster 1817
  • TropicophilusStephens 1826

Tropicbirds are a family, Phaethontidae, of tropical pelagic seabirds. They are the sole living representatives of the order Phaethontiformes. For many years they were considered part of the Pelecaniformes, but genetics indicates they are most closely related to the Eurypygiformes. There are three species in one genus, Phaethon. The scientific names are derived from Ancient Greek phaethon, "sun". [2] They have predominantly white plumage with elongated tail feathers and small feeble legs and feet.

Contents

Taxonomy, systematics and evolution

The genus Phaethon was introduced in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae . [3] The name is from Ancient Greek phaethōn meaning "sun". [4] The type species was designated as the red-billed tropicbird (Phaethon aethereus) by George Robert Gray in 1840. [5] [6]

Tropicbirds were traditionally grouped in the order Pelecaniformes, which contained the pelicans, cormorants and shags, darters, gannets and boobies and frigatebirds; in the Sibley–Ahlquist taxonomy, the Pelecaniformes were united with other groups into a large "Ciconiiformes". More recently this grouping has been found to be massively paraphyletic (missing closer relatives of its distantly related groups) and split again.

Microscopic analysis of eggshell structure by Konstantin Mikhailov in 1995 found that the eggshells of tropicbirds lacked the covering of thick microglobular material of other Pelecaniformes. [7] Jarvis, et al.'s 2014 paper "Whole-genome analyses resolve early branches in the tree of life of modern birds" aligns the tropicbirds most closely with the sunbittern and the kagu of the Eurypygiformes, with these two clades forming the sister group of the "core water birds", the Aequornithes, and the Metaves hypothesis abandoned. [8]

The red-billed tropicbird is basal within the genus. The split between the red-billed tropicbird and the other two tropicbirds is hypothesized to have taken place about six million years ago, with the split between the red-tailed and white-tailed tropicbird taking place about four million years ago. [9]

Phaethusavis and Heliadornis are prehistoric genera of tropicbirds described from fossils.

Extant species

Genus Phaethon Linnaeus, 1758 – Three species
Common nameScientific name and subspeciesRangeSize and ecologyIUCN status and estimated population
Red-billed tropicbird

RED BILLED TROPIC BIRD.jpg

Phaethon aethereus
Linnaeus, 1758

Three subspecies
  • P. a. aethereus Linnaeus, 1758
  • P. a. mesonauta J. L. Peters, 1930
  • P. a. indicus A. O. Hume, 1876
Central Atlantic, East Pacific, Caribbean, and East Atlantic, Persian Gulf, Gulf of Aden, Red Sea
Phaethon aethereus map.svg
Size:

Habitat:

Diet:
 LC 


Red-tailed tropicbird

Red-tailed Tropicbird - Nosy Ve - Madagascar MG 1985 (15108469068).jpg

Phaethon rubricauda
Boddaert, 1783

Four subspecies
  • P. r. rubricauda Boddaert, 1783
  • P. r. westralis Mathews, 1912
  • P. r. roseotinctus Mathews, 1926
  • P. r. melanorhynchos Gmelin, 1789
southern Indian, and western and central Pacific Oceans, from the African coast to Indonesia, the waters around the southern reaches of Japan, across to Chile
Redtailedtropicbirdrge.png
Size:

Habitat:

Diet:
 LC 



White-tailed tropicbird

White-tailed Tropicbird - Phaeton lepturus 2.jpg

Phaethon lepturus
Daudin, 1802

Six subspecies
  • P. l. lepturus
  • P. l. fulvus
  • P. l. dorotheae
  • P. l. catesbyi
  • P. l. ascensionis
  • P. l. europae
tropical Atlantic, western Pacific and Indian Oceans
Phaethon lepturus map.svg
Size:

Habitat:

Diet:
 LC 


Description

Red-tailed tropicbird at Midway Atoll Red tailed tropic bird.jpg
Red-tailed tropicbird at Midway Atoll

Tropicbirds range in size from 76 cm to 102 cm in length and 94 cm to 112 cm in wingspan. Their plumage is predominantly white, with elongated central tail feathers. The three species have different combinations of black markings on the face, back, and wings. Their bills are large, powerful and slightly decurved. Their heads are large and their necks are short and thick. They have totipalmate feet (that is, all four toes are connected by a web). The legs of a tropicbird are located far back on their body, making walking impossible, so that they can only move on land by pushing themselves forward with their feet. [10]

The tropicbirds' call is typically a loud, piercing, shrill, but grating whistle, or crackle. These are often given in a rapid series when they are in a display flight at the colony. In old literature they were referred to as boatswain (bo'sun'/bosun) birds due their loud whistling calls. [11]

Red-billed tropicbird, Genovesa Island, Galapagos Red-billed Tropicbird JCB.jpg
Red-billed tropicbird, Genovesa Island, Galapagos

Behaviour and ecology

Tropicbirds frequently catch their prey by hovering and then plunge-diving, typically only into the surface-layer of the waters. They eat mostly fish, especially flying fish, and occasionally squid. [10] Tropicbirds tend to avoid multi-species feeding flocks, unlike the frigatebirds, which have similar diets.

White-tailed tropicbird nesting on the ground on Cousin Island White-tailed tropicbird (Phaethon lepturus).jpg
White-tailed tropicbird nesting on the ground on Cousin Island

Tropicbirds are usually solitary or in pairs away from breeding colonies. There they engage in spectacular courtship displays. For several minutes, groups of 2–20 birds simultaneously and repeatedly fly around one another in large, vertical circles, while swinging the tail streamers from side to side. If the female likes the presentation, she will mate with the male in his prospective nest-site. Occasionally, disputes will occur between males trying to protect their mates and nesting areas.

Tropicbirds generally nest in holes or crevices on the bare ground. The female lays one white egg, spotted brown, and incubates for 40–46 days. The incubation is performed by both parents, but mostly the female, while the male brings food to feed the female. The chick hatches with grey down. It will stay alone in the nest while both parents search for food, and they will feed the chick twice every three days until fledging, about 12–13 weeks after hatching. The young are not able to fly initially; they will float on the ocean for several days to lose weight before flight.

Tropicbird chicks have slower growth than nearshore birds, and they tend to accumulate fat deposits while young. That, along with one-egg clutches, appears to be an adaptation to a pelagic lifestyle where food is often gathered in large amounts, but may be hard to find.

Notes

  1. "Part 7- Vertebrates". Collection of genus-group names in a systematic arrangement. 2007. Retrieved 30 June 2017.
  2. Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p.  301. ISBN   978-1-4081-2501-4.
  3. Linnaeus, Carl (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis (in Latin). Vol. 1 (10th ed.). Holmiae (Stockholm): Laurentii Salvii. p. 134.
  4. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 301. ISBN   978-1-4081-2501-4.
  5. Gray, George Robert (1840). A List of the Genera of Birds : with an Indication of the Typical Species of Each Genus. London: R. and J.E. Taylor. p. 80.
  6. Mayr, Ernst; Cottrell, G. William, eds. (1979). Check-List of Birds of the World. Vol. 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 155.
  7. Mikhailov, Konstantin E. (1995). "Eggshell structure in the shoebill and pelecaniform birds: comparison with hamerkop, herons, ibises and storks". Canadian Journal of Zoology. 73 (9): 1754–70. doi:10.1139/z95-207.
  8. Jarvis, Erich D.; et al. (2014). "Whole-genome analyses resolve early branches in the tree of life of modern birds". Science. 346 (6215): 1320–1331. doi:10.1126/science.1253451. PMC   4405904 . PMID   25504713.
  9. Kennedy, Martyn; Spencer, Hamish G (2004). "Phylogenies of the frigatebirds (Fregatidae) and tropicbirds (Phaethonidae), two divergent groups of the traditional order Pelecaniformes, inferred from mitochondrial DNA sequences". Molecular Phylogenetics and Evolution. 31 (1): 31–38. doi:10.1016/j.ympev.2003.07.007. ISSN   1055-7903. PMID   15019606.
  10. 1 2 Schreiber, E.A. (1991). Forshaw, Joseph (ed.). Encyclopaedia of Animals: Birds. London: Merehurst Press. p. 63. ISBN   978-1-85391-186-6.
  11. Green, J.F. (1887). Ocean Birds. London: R.H. Porter. p. 52.

Related Research Articles

<span class="mw-page-title-main">Frigatebird</span> Family of seabirds (Fregatidae)

Frigatebirds are a family of seabirds called Fregatidae which are found across all tropical and subtropical oceans. The five extant species are classified in a single genus, Fregata. All have predominantly black plumage, long, deeply forked tails and long hooked bills. Females have white underbellies and males have a distinctive red gular pouch, which they inflate during the breeding season to attract females. Their wings are long and pointed and can span up to 2.3 metres (7.5 ft), the largest wing area to body weight ratio of any bird.

<span class="mw-page-title-main">Ascension frigatebird</span> Species of bird

The Ascension frigatebird is a seabird of the frigatebird family Fregatidae which breeds on Boatswain Bird Island and Ascension Island in the tropical Atlantic Ocean.

<span class="mw-page-title-main">Spoonbill</span> Genus of birds

Spoonbills are a genus, Platalea, of large, long-legged wading birds. The spoonbills have a global distribution, being found on every continent except Antarctica. The genus name Platalea derives from Ancient Greek and means "broad", referring to the distinctive shape of the bill. Six species are recognised, which although usually placed in a single genus have sometimes been split into three genera.

<span class="mw-page-title-main">Pelecaniformes</span> Order of birds

The Pelecaniformes are an order of medium-sized and large waterbirds found worldwide. As traditionally—but erroneously—defined, they encompass all birds that have feet with all four toes webbed. Hence, they were formerly also known by such names as totipalmates or steganopodes. Most have a bare throat patch, and the nostrils have evolved into dysfunctional slits, forcing them to breathe through their mouths. They also have a pectinate nail on their longest toe. This is shaped like a comb and is used to brush out and separate their feathers. They feed on fish, squid, or similar marine life. Nesting is colonial, but individual birds are monogamous. The young are altricial, hatching from the egg helpless and naked in most. They lack a brood patch.

<span class="mw-page-title-main">Red-billed tropicbird</span> Species of seabird of tropical oceans

The red-billed tropicbird is a tropicbird, one of three closely related species of seabird of tropical oceans. Superficially resembling a tern in appearance, it has mostly white plumage with some black markings on the wings and back, a black mask and, as its common name suggests, a red bill. Most adults have tail streamers that are about two times their body length, with those in males being generally longer than those in females. The red-billed tropicbird itself has three subspecies recognized, including the nominate. The subspecies mesonauta is distinguished from the nominate by the rosy tinge of its fresh plumage, and the subspecies indicus can be differentiated by its smaller size, more restricted mask, and more orange bill. This species ranges across the tropical Atlantic, eastern Pacific, and Indian Oceans. The nominate is found in the southern Atlantic Ocean, the subspecies indicus in the waters off of the Middle East and in the Indian Ocean, and the subspecies mesonauta in the eastern portions of both the Atlantic and the Pacific Oceans and in the Caribbean. It was one of the many species described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.

<span class="mw-page-title-main">Red-tailed tropicbird</span> Seabird of the tropical Indian and Pacific Oceans

The red-tailed tropicbird is a seabird native to tropical parts of the Indian and Pacific Oceans. One of three closely related species of tropicbird (Phaethontidae), it was described by Pieter Boddaert in 1783. Superficially resembling a tern in appearance, it has almost all-white plumage with a black mask and a red bill. The sexes have similar plumage. As referenced in the common name, adults have red tail streamers that are about twice their body length. Four subspecies are recognised, but there is evidence of clinal variation in body size—with smaller birds in the north and larger in the south—and hence no grounds for subspecies.

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

The white-tailed tropicbird is a tropicbird. It is the smallest of three closely related seabirds of the tropical oceans and smallest member of the order Phaethontiformes. It is found in the tropical Atlantic, western Pacific and Indian Oceans. It also breeds on some Caribbean islands, and a few pairs have started nesting recently on Little Tobago, joining the red-billed tropicbird colony. In addition to the tropical Atlantic, it nests as far north as Bermuda, where it is locally called a "longtail".

<span class="mw-page-title-main">Phaethontiformes</span> Order of birds

The Phaethontiformes are an order of birds. They contain one extant family, the tropicbirds (Phaethontidae), and one extinct family Prophaethontidae from the early Cenozoic. Several fossil genera have been described, with well-preserved fossils known as early as the Paleocene. The group's origins may lie even earlier if the enigmatic waterbird Novacaesareala from the latest Cretaceous or earliest Paleocene of New Jersey is considered a tropicbird.

References