Redpoll

Redpoll
Male, Quebec Canada
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Fringillidae
Subfamily: Carduelinae
Genus: Acanthis
Borkhausen, 1797
Species:
A. flammea
Binomial name
Acanthis flammea

The redpoll (Acanthis flammea) is a species of small passerine bird in the finch family Fringillidae. It is the only species placed in the genus Acanthis. It breeds in the Arctic and north temperate Holarctic tundra and taiga. The redpoll was formerly widely treated as three species: the common or mealy redpoll, the arctic or hoary redpoll (A. hornemanni), and the lesser redpoll (A. cabaret).

Taxonomy

The redpoll was listed in 1758 by the Swedish naturalist Carl Linnaeus in the 10th edition of his Systema Naturae under the binomial name Fringilla flammea.[2][3] The specific epithet flammea is Latin meaning "flame-coloured".[4] Linnaeus also described the redpoll as Fringilla linaria on the same page, but the earlier name flammea has priority.[2][5][6]

The redpoll was previously placed in the genus Carduelis. Molecular phylogenetic studies showed that it formed a distinct lineage, so it was moved to the resurrected genus Acanthis that had been introduced in 1797 by the German naturalist Moritz Balthasar Borkhausen.[7][8][9] The genus name Acanthis is from Ancient Greek akanthis, a name for a small now-unidentifiable bird.[10]

Five subspecies are recognised:[9]

  • A. f. flammea (Linnaeus, 1758) – north Europe, Siberia, Alaska and Canada
  • A. f. rostrata (Coues, 1861) – northeast Canada, Greenland and Iceland
  • A. f. cabaret (Müller, PLS, 1776) – temperate west, central west Palearctic lowland (montane in south) birch and larch woods: British Isles, southwest Scandinavia east to north Germany and south Poland; south to southeast France, Austria and Czech Republic
  • A. f. exilipes (Coues, 1862) – low (locally high) Arctic tundra birch and willow of north Eurasia, north Alaska and northwest Canada
  • A. f. hornemanni (Holbøll, 1843) – low (locally high) Arctic tundra birch and willow of far northeast Canada and Greenland

The redpoll was formerly regarded as three separate species: the common redpoll with subspecies flammea and rostrata, the lesser redpoll with subspecies cabaret and the arctic redpoll with subspecies hornemanni and exilipes. The three species are now considered as conspecific based on the small genetic differences and the continuous phenotypic variation.[9][11][12]

Description

Eggs

The redpoll is a small brownish-grey finch with dark streaks and a bright red patch on its forehead. It has a black bib and two pale stripes on the wings. Males often have their breasts suffused with red. It is smaller, browner and more streaked than the generally similar Arctic redpoll, adults measuring between 11.5 and 14 centimetres (4.5 and 5.5 in) in length and weighing between 12 and 16 grams (0.42 and 0.56 oz). Wingspan ranges from 7.5 to 8.7 in (19-22 cm).[13] The rump is streaked and there is a broad dark brown streak across the vent. It has brown legs, dark-tipped yellowish bills and dark brown irises.[14]

Calls from a flock of birds feeding, Iowa USA

Similar species

The redpoll is larger and paler than the lesser redpoll with which it often mixes, apparently without significant interbreeding, though sympatry was established too recently to draw firm conclusions.[15] The male mealy redpolls are darker than the similarly sized Arctic redpolls, but the females are almost identical.[citation needed]

Foraging redpoll filmed in Holland

Distribution and habitat

The range of the redpoll extends through northern Europe and Asia to northern North America, Greenland and Iceland. It is a partial migrant, moving southward in late autumn and northward again in March and April. Its typical habitat is boreal forests of pines, spruces and larches. It feeds mainly on seeds, principally birch and alder seeds in the winter.[14]

Redpolls, subspecies A. f. cabaret, were introduced into New Zealand between 1862 and 1875. They are now found throughout both the North and South Islands as well as on many outlying islands.[16][17]

Behaviour

Breeding

The redpoll first breed when they are one year old. The female builds the nest, accompanied by the male, often low down in a tree or bush. It has an outer layer of thin twigs, a middle layer of root fibres, fragments of juniper bark and lichens and an inner layer of down, wool and hair. Three to seven speckled eggs are laid. The eggs are 16.9 mm × 12.6 mm (0.67 in × 0.50 in) with a calculted weight of 1.4 g (0.049 oz). They are incubated by the female and hatch after about 11 days. The young are cared for by both parents but are brooded only by the female. The chicks fledge when aged around 13 days. Generally two broods are raised each year.[18]

Food and feeding

The diet is mostly very small seeds, especial those from birch trees (Betula). In the breeding season some invertebrates are also eaten. It forages mainly in trees but will occasinally forage on the ground.[19]

References

  1. ^ BirdLife International (2019) [amended version of 2018 assessment]. "Acanthis flammea". IUCN Red List of Threatened Species. 2019: e.T22725044A155292529. doi:10.2305/IUCN.UK.2018-2.RLTS.T22725044A155292529.en. Retrieved 12 November 2021.
  2. ^ a b 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. 182.
  3. ^ Paynter, Raymond A. Jnr., ed. (1968). Check-list of Birds of the World. Vol. 14. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 251.
  4. ^ Jobling, James A. "flammea". The Key to Scientific Names. Cornell Lab of Ornithology. Retrieved 27 September 2024.
  5. ^ Lönnberg, Einar (1931). "Olof Rudbeck, Jr., the first Swedish ornithologist". Ibis. 73 (2): 302–307. doi:10.1111/j.1474-919X.1931.tb01519.x.
  6. ^ Knox, Alan (1988). "The taxonomy of redpolls". Ardea. 76: 1–26.
  7. ^ Zuccon, Dario; Prŷs-Jones, Robert; Rasmussen, Pamela C.; Ericson, Per G.P. (2012). "The phylogenetic relationships and generic limits of finches (Fringillidae)" (PDF). Molecular Phylogenetics and Evolution. 62 (2): 581–596. Bibcode:2012MolPE..62..581Z. doi:10.1016/j.ympev.2011.10.002. PMID 22023825.
  8. ^ Borkhausen, Moritz Balthasar (1797). Deutsche Fauna, oder, Kurzgefasste Naturgeschichte der Thiere Deutschlands. Erster Theil, Saugthiere und Vögel (in German). Frankfurt am Mayn: Varrentrapp und Wenner. p. 248.
  9. ^ a b c Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2024). "Finches, euphonias". IOC World Bird List Version 14.2. International Ornithologists' Union. Retrieved 27 November 2024.
  10. ^ Jobling, James A. "Acanthis". The Key to Scientific Names. Cornell Lab of Ornithology. Retrieved 27 September 2024.
  11. ^ Mason, N.A.; Taylor, S.A. (2015). "Differentially expressed genes match bill morphology and plumage despite largely undifferentiated genomes in a Holarctic songbird". Molecular Ecology. 24 (12): 3009–3025. doi:10.1111/mec.13140.
  12. ^ Funk, E.R.; Mason, N.A.; Pálsson, S.; Albrecht, T.; Johnson, J.A.; Taylor, S.A. (2021). "A supergene underlies linked variation in color and morphology in a Holarctic songbird". Nature Communications. 12 (1): 6833. doi:10.1038/s41467-021-27173-z. PMC 8616904.
  13. ^ "Common Redpoll Identification, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 29 September 2020.
  14. ^ a b "Redpoll: Carduelis flammea". NatureGate. Retrieved 13 December 2013.
  15. ^ Sangster, George; Knox, Alan G.; Helbig, Andreas J.; Parkin, David T. (2002). "Taxonomic recommendations for European birds". Ibis. 144 (1): 153–159. doi:10.1046/j.0019-1019.2001.00026.x.
  16. ^ "Common Redpoll". New Zealand Birds Online. Retrieved 27 November 2024.
  17. ^ Higgins, P.J.; Peter, J.M.; Cowling, S.J., eds. (2006). "Carduelis flammea Common Redpoll" (PDF). Handbook of Australian, New Zealand & Antarctic Birds. Vol. 7, Boatbill to Starlings, Part 7B, Dunnock to Starling. Melbourne, Victoria: Oxford University Press. pp. 1345–1355. ISBN 978-0-19-553996-7.
  18. ^ Cramp 1994, pp. 656–657.
  19. ^ Cramp 1994, p. 645.

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