Picinae

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Woodpeckers
Melanerpes striatus001, crop.jpg
Hispaniolan woodpecker
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Piciformes
Family: Picidae
Subfamily: Picinae
Bonaparte 1838
Genera

Several, see text

Picinae containing the true woodpeckers is one of four subfamilies that make up the woodpecker family Picidae. True woodpeckers are found over much of the world, but do not occur in Madagascar or Australasia.

Contents

Woodpeckers gained their English name because of the habit of some species of tapping and pecking noisily on tree trunks with their beaks and heads. This is both a means of communication to signal possession of territory to their rivals, and a method of locating and accessing insect larvae found under the bark or in long winding tunnels in the tree or upright log.

Golden-fronted woodpecker, Melanerpes aurifrons Melanerpes aurifrons2.jpg
Golden-fronted woodpecker, Melanerpes aurifrons

Physiology and behaviour

Some woodpeckers and wrynecks in the order Piciformes have zygodactyl feet, with two toes pointing forward, and two backward. These feet, though adapted for clinging to a vertical surface, can be used for grasping or perching. Several species have only three toes. The woodpecker's long tongue, in many cases as long as the woodpecker itself, can be darted forward to capture insects. The tongue is not attached to the woodpecker's head in the same way as it is in most birds, but instead it curls back up around its skull, which allows it to be so long.

The woodpecker first locates a tunnel by tapping on the trunk with its head. Once a tunnel is found, the woodpecker chisels out wood until it makes an opening into the tunnel. Then it worms its tongue into the tunnel to try to locate the grub. The tongue of the woodpecker is long and ends in a barb. With its tongue the woodpecker skewers the grub and draws it out of the trunk.

Woodpeckers also use their beaks to create larger holes for their nests which are 15–45 cm (6–18 inches) below the opening. These nests are lined only with wood chips and hold 2–8 white eggs. Because the nests are out of sight, they are not visible to predators and eggs do not need to be camouflaged. Cavities created by woodpeckers are also reused as nests by other birds, such as grackles, starlings, some ducks and owls, and mammals, such as tree squirrels.

Several adaptations combine to protect the woodpecker's brain from the substantial pounding that the pecking behaviour causes: it has a relatively thick skull with relatively spongy bone to cushion the brain; there is very little cerebrospinal fluid in its small subarachnoid space; the bird contracts mandibular muscles just before impact, thus transmitting the impact past the brain and allowing its whole body to help absorb the shock; its relatively small brain is less prone to concussion than other animals'. [1]

Some species have modified joints between bones in the skull and upper jaw, as well as muscles which contract to absorb the shock of the hammering. Strong neck and tail-feather muscles, and a chisel-like bill are other hammering adaptations which are seen in most species. Other species of woodpecker, such as the Flicker, uses its long tongue primarily to grab prey from the ground or from under loose bark. It has few shock-absorbing adaptations, and prefers to feed on the ground or to chip away at rotting wood and bark, habits observed in birds outside of the woodpecker family. A "continuum" in skull structures, from little- to highly specialized for pounding is seen in different genera (groups of related species) of woodpeckers alive today. In his classic "Birds of America," John James Audubon describes the slight gradations in hyoid horn length found in different species of living woodpeckers. The slack of tongue is kept under the loose skin behind its neck. The tiny bones divide into essentially two tongues, coming back together before entering the beak.

Systematics

The systematics of woodpeckers is quite convoluted. Based on an assumption of unrealistically low convergence in details of plumage and behavior, 5 subfamilies were distinguished. However, it has turned out that similar plumage patterns and modes of life are not reliable to determine higher phylogenetic relationships in woodpeckers, and thus only 3 subfamilies should be accepted.

For example, the genera Dryocopus (Eurasia and Americas) and Campephilus (Americas) of large woodpeckers were believed to form a distinct group. However, they are quite unrelated and instead close, respectively, to the genera, Mulleripicus and Chrysocolaptes , of Southeast Asia. In addition, the genus allocation of many species, e.g. the rufous woodpecker, has turned out to be in error, and some taxa with unclear relationships could be placed into the phylogeny. [2] [3]

In 1975 John Morony and colleagues in their Reference List of the Birds of the World divided the true woodpeckers into six tribes: Melanerpini, Campetherini, Colaptini, Campephilini, Picini, Meiglyptini. [4] This classification was used in 1982 by Lesley Short in his Woodpeckers of the World. [5] The introduction of molecular methods led to a substantial reorganization of the phylogeny making the earlier groups obsolete. In 2005 David Webb and William Moore divided the main woodpecker genera into three tribes: Megapicini, Malarpicini and Dendropicini. [6] These names were rapidly accepted by other ornithologists but in 2013 Edward Dickinson and Leslie Christidis in the fourth edition of the Howard and Moore Complete Checklist of the Birds of the World rejected these new names on the grounds that the earlier names had precedence. Webb and Moore's Malarpicini, Megapicini and Dendropicini were replaced by Pici, Campephilini and Melanerpini. Dickinson and Christidis also introduced Nesoctitini for the Antillean piculets and Hemicircini for the two species in Hemicircus giving a total of five tribes. [7]

Genera

Picinae 
Relationships between the genera based on a phylogenetic study by Sabir Shakya and colleagues published in 2017. [8]

The world bird list maintained by Frank Gill, Pamela Rasmussen and David Donsker on behalf of the International Ornithologists' Union recognises 208 species of true woodpecker which are split up into 33 genera. [9] The division into tribes is based on the 2017 study by Sabir Shakya and colleagues. [8]

Tribe Nesoctitini

Tribe Hemicircini

Tribe Picini

Tribe Campephilini

Tribe Melanerpini (pied woodpeckers)

Unassigned fossil forms

Notes

  1. ↑ In the eBird/Clements Checklist of Birds of the World which is maintained by the Cornell Lab of Ornithology, the genus Dryobates is expanded to include the species in Leuconotopicus and Veniliornis. [10]
  2. ↑ The Cuban green woodpecker (Xiphidiopicus percussus) was not sampled by Shakya and colleagues in their 2017 study. [8] An earlier study in which DNA sequences of mitochondrial cytochrome-b were compared indicated that the Cuban woodpecker was most closely related to species in the genus Melanerpes. [11]

Related Research Articles

<span class="mw-page-title-main">Woodpecker</span> Family of birds (Picidae)

Woodpeckers are part of the bird family Picidae, which also includes the piculets, wrynecks and sapsuckers. Members of this family are found worldwide, except for Australia, New Guinea, New Zealand, Madagascar and the extreme polar regions. Most species live in forests or woodland habitats, although a few species are known that live in treeless areas, such as rocky hillsides and deserts, and the Gila woodpecker specialises in exploiting cacti. Woodpeckers are known as the loudest birds of the forest.

<span class="mw-page-title-main">Hairy woodpecker</span> Species of bird

The hairy woodpecker is a medium-sized woodpecker that is found over a large area of North America. It is approximately 250 mm (9.8 in) in length with a 380 mm (15 in) wingspan. With an estimated population in 2020 of almost nine million individuals, the hairy woodpecker is listed by the IUCN as a species of least concern. Some nomenclature authorities, such as the eBird/Clements checklist, place this species in the genus Dryobates.

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

The sapsuckers are species of North American woodpeckers in the genus Sphyrapicus.

<i>Chrysocolaptes</i> Genus of birds

Chrysocolaptes is a genus of birds in the woodpecker family Picidae that are found in South and Southeast Asia.

<i>Campephilus</i> Genus of birds

Campephilus is a genus of large American woodpeckers in the family Picidae.

<i>Dryocopus</i> Genus of birds

Dryocopus is a genus of large powerful woodpeckers, typically 35–45 cm in length. It has representatives in North and South America, Europe, and Asia; some South American species are endangered. It was believed to be closely related to the American genus Campephilus, but it is part of a different lineage of woodpeckers altogether

<i>Picoides</i> Genus of birds

Picoides is a genus of woodpeckers that are native to Eurasia and North America, commonly known as three-toed woodpeckers.

<i>Melanerpes</i> Genus of birds

Melanerpes is a genus of woodpeckers of the family Picidae found in the New World. The 24 members of the genus are mostly colourful birds, conspicuously barred in black and white, with some red and yellow.

<i>Colaptes</i> Genus of birds

Colaptes is a genus of birds in the woodpecker family Picidae. The 14 species are found across the Americas.

<i>Dendrocopos</i> Genus of birds

Dendrocopos is a widespread genus of woodpeckers from Asia, Europe and Northern Africa. The species range from the Philippines to the British Isles.

<i>Blythipicus</i> Genus of birds

Blythipicus is a genus of birds in the woodpecker family Picidae that are found in Southeast Asia.

<i>Dendropicos</i> Genus of birds

Dendropicos is a genus of woodpeckers in the family Picidae. They are small woodpeckers that are native to the sub-Saharan woodlands and forests.

<i>Meiglyptes</i> Genus of birds

Meiglyptes is a genus of Southeast Asian birds in the woodpecker family Picidae.

<i>Mulleripicus</i> Genus of birds

Mulleripicus is a genus of birds in the woodpecker family Picidae. They are found in South and Southeast Asia. The genus forms part of the woodpecker subfamily Picinae and has a sister relationship to the genus Dryocopus whose species are widely distributed in Eurasia and the Americas.

<i>Piculus</i> Genus of birds

Piculus is a genus of birds in the woodpecker family Picidae that are found in Central and South America.

<i>Celeus</i> (bird) Genus of birds

Celeus is a genus of bird in the woodpecker family, Picidae, found in tropical and subtropical forests and woodlands of Central and South America. The genus contains 13 extant species. One, Kaempfer's woodpecker, was believed to be extinct until a specimen was caught in 2006.

<i>Leuconotopicus</i> Genus of birds

Leuconotopicus is a genus of woodpeckers in the family Picidae native to North and South America.

<i>Yungipicus</i> Genus of birds

Yungipicus is a genus of woodpeckers in the family Picidae native to Asia. The species in this genus were previously placed in the genus Dendrocopos.

<i>Dendrocoptes</i> Genus of birds

Dendrocoptes is a genus of woodpeckers in the native to Eurasia.

<i>Chloropicus</i> Genus of birds

Chloropicus is a genus of birds in the woodpecker family Picidae that are native to Sub-Saharan Africa.

References

  1. ↑ Cure for a headache, Ivan R. Schwab, British Journal of Ophthalmology. 86(8):843, August 2002.
  2. ↑ Benz, B.W.; Robbins, M.B.; Peterson, A.T. (2006). "Evolutionary history of woodpeckers and allies (Aves: Picidae): Placing key taxa on the phylogenetic tree". Molecular Phylogenetics and Evolution. 40 (2): 389–399. Bibcode:2006MolPE..40..389B. doi:10.1016/j.ympev.2006.02.021. PMID   16635580.
  3. ↑ Moore, W.S.; Weibel, A.C.; Aguis, A. (2006). "DNA phylogeny of the woodpecker genus Veniliornis (Picidae, Picinae) and related genera implies convergent evolution of plumage patterns". Biological Journal of the Linnean Society. 87 (4): 611–624. doi: 10.1111/j.1095-8312.2006.00586.x .
  4. ↑ Morony, John J.; Bock, Walter J.; Farrand, John (1975). Reference List of the Birds of the World. New York: Department of Ornithology, American Museum of Natural History. pp. 66–68. hdl:2246/6700.
  5. ↑ Short, Lester L. (1982). Woodpeckers of the World. Monograph Series 4. Greenville, Delaware: Delaware Museum of Natural History. p. 36. ISBN   0-913176-05-2.
  6. ↑ Webb, David Matthew; Moore, William S. (2005). "A phylogenetic analysis of woodpeckers and their allies using 12S, Cyt b, and COI nucleotide sequences (class Aves; order Piciformes)". Molecular Phylogenetics and Evolution. 36 (2): 233–248. Bibcode:2005MolPE..36..233W. doi:10.1016/j.ympev.2005.03.015. PMID   15869887.
  7. ↑ Dickinson, E.C.; Remsen, J.V. Jr., eds. (2013). The Howard & Moore Complete Checklist of the Birds of the World. Vol. 1: Non-passerines (4th ed.). Eastbourne, UK: Aves Press. pp. 298, 307, 309. ISBN   978-0-9568611-0-8.
  8. 1 2 3 Shakya, S.B.; Fuchs, J.; Pons, J.-M.; Sheldon, F.H. (2017). "Tapping the woodpecker tree for evolutionary insight". Molecular Phylogenetics and Evolution. 116: 182–191. Bibcode:2017MolPE.116..182S. doi: 10.1016/j.ympev.2017.09.005 . PMID   28890006.
  9. ↑ Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (2020). "Woodpeckers". IOC World Bird List Version 10.1. International Ornithologists' Union. Retrieved 17 May 2020.
  10. ↑ Clements, J.F.; Schulenberg, T.S.; Iliff, M.J.; Billerman, S.M.; Fredericks, T.A.; Sullivan, B.L.; Wood, C.L. (2019). "The eBird/Clements Checklist of Birds of the World: v2019" . Retrieved 18 May 2020.
  11. ↑ Overton, Lowell C.; Rhoads, Douglas D. (2006). "Molecular phylogenetic relationships of Xiphidiopicus percussus, Melanerpes, and Sphyrapicus (Aves: Picidae) based on cytochrome b sequence". Molecular Phylogenetics and Evolution. 41 (2): 288–294. Bibcode:2006MolPE..41..288O. doi:10.1016/j.ympev.2006.05.014. PMID   16814571.
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