Española cactus finch

The Española cactus finch (Geospiza conirostris), is a species of bird in the tanager family Thraupidae. It is one of Darwin's finches, and is endemic to the Galápagos islands, where it is restricted to Española, Genovesa, and the Darwin and Wolf Islands. This rather dark bird resembles the smaller and finer-beaked common cactus finch, but the two species do not co-inhabit any island.

Española cactus finch
On Española Island, the Galápagos Islands, Ecuador
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Passeriformes
Family: Thraupidae
Genus: Geospiza
Species:
G. conirostris
Binomial name
Geospiza conirostris
Ridgway, 1890

Its natural habitat is dry shrubland and it is commonly seen on the ground. Its main food source is the cactus Opuntia.

Taxonomy

The Española cactus finch is one of Darwin's finches, a group of closely related birds that evolved on the Galápagos Islands. The group is related to the Tiaris grassquits, which are found in South America and the Caribbean.[2] An ancestral relative of those grassquits arrived on the Galápagos Islands some 2–3 million years ago, and the Española cactus finch is one of the species that evolved from that ancestor.[3]

From a study done in 2015, the Española cactus finch (G. conirostris) of Española was found to be a sister to the large ground finch, not to the Genovesa cactus finch.[4] The International Ornithologists' Union has changed the taxonomy based on the study. Other taxonomic authorities have kept the large cactus finch and the Genovesa cactus finch conspecific.

Genetic speciation

The Española cactus finch (G. conirostris) first arrived in Daphne Major in 1981, when it was observed to be a newcomer by Peter and Rosemary Grant. This has enabled scientists to trace changes in its genome: it originally interbred with local finches (G. fortis) but has ceased to do so in later generations. The new descendants have become a distinct species. It is the first example of speciation to be directly observed by scientists in the field.[5] Subsequent genetic research suggests that genes for beak shape (ALX1) and beak size (HMGA2) may be crucial in separating the hybridized species from local finches. Genes relating to the finches' song may also be involved.[6][7]

Description

The Española cactus finch is among the largest of the Darwin's finches, measuring 15 cm (5.9 in) in length. The male is black, with white-tipped undertail coverts. Female and immature birds range in color from dull gray to matte black, and frequently show white edges to the feathers of their underparts.[8]

  • Female on Española
    Female on Española
  • Male on Española
    Male on Española

References
  1. BirdLife International (2020). "Geospiza conirostris". IUCN Red List of Threatened Species. 2020: e.T103815509A182514440. doi:10.2305/IUCN.UK.2020-3.RLTS.T103815509A182514440.en. Retrieved 12 November 2021.
  2. Newton, Ian (2003). Speciation and Biogeography of Birds. San Diego, CA, USA: Academic Press. p. 78. ISBN 978-0-12-517375-9.
  3. Grant & Grant (2008), p. 25.
  4. Lamichhaney, Sangeet; Berglund, Jonas; Almén, Markus Sällman; Maqbool, Khurram; Grabherr, Manfred; Martinez-Barrio, Alvaro; Promerová, Marta; Rubin, Carl-Johan; Wang, Chao; Zamani, Neda; Grant, B. Rosemary; Grant, Peter R.; Webster, Matthew T.; Andersson, Leif (February 2015). "Evolution of Darwin's finches and their beaks revealed by genome sequencing". Nature. 518 (7539): 371–375. doi:10.1038/nature14181. ISSN 1476-4687. PMID 25686609. S2CID 4462253. Retrieved 14 February 2022.
  5. Galloway, Rory (23 November 2017). "Galapagos finches caught in act of becoming new species". BBC News. Retrieved 14 February 2022.
  6. Holmes, Bob (10 February 2022). "Learning about birds from their genomes". Knowable Magazine. doi:10.1146/knowable-021022-1. Retrieved 11 February 2022.
  7. Lamichhaney, Sangeet; Han, Fan; Webster, Matthew T.; Andersson, Leif; Grant, B. Rosemary; Grant, Peter R. (12 January 2018). "Rapid hybrid speciation in Darwin's finches". Science. 359 (6372): 224–228. doi:10.1126/science.aao4593. PMID 29170277. S2CID 206663426. Retrieved 14 February 2022.
  8. Swash, Andy; Still, Rob (2005). Birds, Mammals, and Reptiles of the Galápagos Islands: An Identification Guide (2nd ed.). London, UK: Christopher Helm. p. 104. ISBN 978-0-300-11532-1.

Cited works
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