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| Madeiran long-toed pigeon | |
|---|---|
| Name | Madeiran long-toed pigeon |
| Status | Extinct (hypothetical) |
| Status system | IUCN |
| Genus | Columba |
| Species | sp. |
| Authority | Unknown |
Madeiran long-toed pigeon The Madeiran long-toed pigeon is an extinct or hypothetical Columbid described from subfossil remains attributed to the island of Madeira in the North Atlantic. Initially recognized from osteological material, the taxon has been discussed in the context of avian biogeography of Atlantic islands including Madeira, the Canary Islands, and Cape Verde, and compared with extinct and extant species from Europe, Africa, and Macaronesia.
Material attributed to the Madeiran long-toed pigeon was catalogued in museum collections and compared with taxa such as Columba livia, Columba palumbus, Patagioenas plumbea, Streptopelia turtur, and extinct insular pigeons like Columba trocaz (Madeiran wood pigeon), Columba bollii (laurel pigeon), and species from Azores and Canary Islands. Taxonomic treatments have referenced workers associated with institutions such as the Natural History Museum, London, Museu de História Natural do Funchal, Smithsonian Institution, and researchers affiliated with University of Cambridge, University of Lisbon, and University of Oxford. Nomenclatural proposals have cited principles from the International Commission on Zoological Nomenclature and compared osteological characters with collections at the American Museum of Natural History and the Museu de História Natural e da Ciência (Portugal). Debates over generic allocation referenced paleornithological studies by teams including those from Royal Society publications, the Zoological Journal of the Linnean Society, and regional surveys coordinated with the European Union funding programs.
Osteological descriptions emphasize elongated pedal phalanges and a disproportionately long hallux, leading to the vernacular "long-toed" designation. Comparative anatomy drew parallels with species such as Calonectris diomedea (shearwater) only in pedal proportions, and with terrestrial Columbidae like Geotrygon montana for robustness of tarsometatarsus. Measurements were compared against specimens from the British Museum (Natural History), Muséum national d'Histoire naturelle and collections assembled during expeditions linked to figures like Charles Darwin and later collectors associated with Alexander von Humboldt-inspired voyages. Morphological discussions referenced osteological keys used by authors from Harvard University and University of California, Berkeley.
Fossil and subfossil remains were recovered from localities on Madeira and adjacent islets, with stratigraphic contexts tied to Quaternary deposits correlated with work by geologists from institutions such as United States Geological Survey and Portuguese agencies. Habitat reconstructions invoked comparisons with present-day laurel forest on Madeira, exemplar sites like Laurisilva of Madeira, and vegetational analogues in the Canary Islands and Azores. Paleohabitat inferences used palynological records produced by teams collaborating with Royal Society of London and regional museums, drawing parallels with island habitats studied by conservationists at BirdLife International and projects under the aegis of the European Commission.
Ecological interpretations derive from morphological proxies and comparisons with frugivorous and granivorous Columbidae such as Columba livia, Columba palumbus, and Didunculus strigirostris (tooth-billed pigeon), and with island specialists like Raphus cucullatus (dodo) in terms of insular niche shifts. Hypotheses propose a diet of native fruits and seeds from trees like Ocotea foetens and shrubs documented in Madeira surveys by botanists from Royal Botanic Gardens, Kew and Jardim Botânico da Madeira. Potential interactions with introduced predators and commensal humans were framed against island examples studied by authors linked to IUCN assessments, WWF, and historical accounts from mariners associated with Age of Discovery voyages.
No direct nesting material is known; reproductive inferences rely on comparisons with phylogenetically related pigeons including nesting habits of Columba palumbus and island species such as Columba trocaz. Life-history traits were extrapolated from body-size scaling relationships used in papers from University of Copenhagen and University of Bristol, and from studies of clutch size and juvenile development published in outlets including the Journal of Avian Biology and reports prepared for conservation authorities like the Madeira Natural Park Authority.
Although known only from subfossil remains, the Madeiran long-toed pigeon has been treated as regionally extinct or extinct prior to scientific documentation, with threat analogues drawn from impacts recorded for insular birds: habitat loss from human colonization associated with events tied to the Age of Discovery, introduction of predators such as Rattus rattus and Felis catus, and land-use change recorded in archives held by Arquivo Regional da Madeira and colonial records in the Arquivo Nacional Torre do Tombo. Comparative extinction dynamics referenced case studies involving Dodo, Labrador Duck, and island faunas assessed by researchers at University of Glasgow and University of York.
Subfossil elements were discovered during cave and dune excavations on Madeira, documented in field notes deposited at the Museu de História Natural do Funchal and reported in regional journals and proceedings of societies including the Linnean Society of London and meetings of the European Ornithologists' Union. Early collectors included naturalists whose collections later entered institutions such as the Natural History Museum, London and Museu Nacional de História Natural e da Ciência (Portugal). Subsequent analyses involved comparative morphology, radiocarbon dating techniques developed at facilities like Oxford Radiocarbon Accelerator Unit and collaborative studies published through outlets like the Proceedings of the Royal Society B and the Zoological Journal of the Linnean Society.
Category:Birds of Madeira Category:Extinct birds of Macaronesia