Junco insularis

Life-forms

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Cladus: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Cladus: Telluraves
Cladus: Australaves
Ordo: Passeriformes
Subordo: Passeri
Infraordo: Passerida
Superfamilia: Passeroidea

Familia: Passerellidae
Genus: Junco
Species: Junco insularis
Name

Junco insularis Ridgway, 1876
Synonyms

Junco hyemalis insularis Ridgway, 1876
Junco mearnsi insularis Ridgway, 1876

References
Primary references

Bulletin of the United States Geological and Geographic Survey of the Territories (2) 2: p. 188 BHL

Additional references

Aleixandre, P., Hernández Montoya, J. & Milá, B. 2013. Speciation on Oceanic Islands: Rapid Adaptive Divergence vs. Cryptic Speciation in a Guadalupe Island Songbird (Aves: Junco). PLoS ONE 8(5): e63242 Full article (PDF) DOI: 10.1371/journal.pone.0063242Reference page.

Links

IUCN: Junco insularis (Endangered)

Vernacular names
čeština: Strnadec guadalupský
Deutsch: Guadalupe-Junko
English: Guadalupe Junco
Esperanto: Guadalupa junkulo
español: Junco de Guadalupe
فارسی: سازونشین گوآدالوپه
Nederlands: Guadalupejunco
svenska: guadalupejunco

The Guadalupe junco (Junco insularis) is a small bird in the New World sparrow family that is endemic to Guadalupe Island off the western coast of Baja California, Mexico. Many taxonomic authorities classified it in 2008 as a subspecies of the dark-eyed junco (Junco hyemalis).[2][3] In 2016, it was re-classified as a full species.[4]
Description and ecology

The Guadalupe junco has a dull grayish head with a gray bill and brownish upperparts. Its wings and tail are blackish, though the tail has white edges. Its underparts are white with a rufous fringe at the bottom of the wings. It makes a high, sharp sik and a long series of chipping notes.

This bird is today found mainly in the Guadalupe cypress (Cupressus guadalupensis) groves on Guadalupe Island, with a few birds in the remaining Monterey pine (Pinus radiata) stands. Around 1900, it was known to utilize almost any habitat for breeding. It ranged over the whole island for feeding then, and indeed still does theoretically, but actually only a handful of flocks exist, mostly in the northern part of the island. A testimony to the adaptability of this species is the fact that, today, a few birds breed at the seashore in non-native tree tobacco (Nicotiana glauca) shrubs, since this is dense enough to provide some protection from feral cats.[5]

The breeding season is from February to June. Three to four eggs are laid in a bulky cup nest of dried grass stems, which is either in a depression in the ground or in the lower branches of a tree. The eggs are greenish-white with reddish-brown spots. If food is plentiful, the birds apparently breed twice a year.[5][6]
Decline to near-extinction

This bird used to be abundant, but now only 50 to 100 adult birds are thought to survive, mostly in the northern part of the island. Domestic goats (Capra hircus) that were introduced to the island to provide food for fishermen and to start a meat canning plant in the early to mid-19th century became feral, multiplied and overran it by the late 19th century, with more than four goats per hectare (nearly two per acre) being present around the 1870s.[7] Domestic cats (Felis catus) that were introduced to the island next also became feral, multiplied and overran it and as the habitat was destroyed by the feral goats, the endemic wildlife was destroyed by the feral cats.[8] In 1897, Kaeding found the Guadalupe junco "abundant", but already decreasing due to feral cat predation.[6] Anthony summed up 10 years of occasional visits in 1901 by noting that "...the juncos are slowly but surely becoming scarce."[8] He blamed the interaction of the feral goats destroying the habitat and the feral cats destroying the birds themselves.

Wilmot W. Brown Jr., H. W. Marsden and Ignacio Oroso surveyed Guadalupe throughout May and June 1906, and collected numerous bird specimens for the Thayer Museum – among these a "large series" of the Guadalupe junco.[9] They found the Guadalupe junco "fairly abundant" but, despite the depredations of the feral cats, still "a very tame, confiding little bird" – in other words, unwary of predators.

The feral goats were extirpated from the island by 2006 by the Grupo de Ecologia y Conservacion de Islas and Island Conservation,[10] permitting a spectacular regeneration of the native flora. The island was recently protected as a biosphere reserve, again by the above groups. As the habitat regenerates and, especially, if the planned containment (at the least) or extirpation (at the most) of the feral cats will be undertaken, the remaining Guadalupe juncos will surely find more protected breeding and feeding sites. Indeed, the future of the Guadalupe junco looks better than it did during the 20th century, although it is still precariously close to extinction and could be wiped out by any chance event, such as a violent storm or an introduced disease. On the IUCN Red List, it is classified as Endangered.[11]
Footnotes

BirdLife International (2016). "Junco insularis". IUCN Red List of Threatened Species. 2016: e.T22721102A104279152. doi:10.2305/IUCN.UK.2016-3.RLTS.T22721102A104279152.en. Retrieved 19 November 2021.
BirdLife International (2008) Guadalupe junco species factsheet. Retrieved 2008-MAY-26.
BirdLife International (2008) 2008 IUCN Redlist status changes Archived 28 August 2007 at the Wayback Machine. Retrieved 2008-MAY-23.
Birdlife International (2016) Dark-eyed Junco (Junco hyemalis) is being split: list J. hyemalis as Least Concern and J. insularis as Endangered or Vulnerable? Archived 18 July 2020 at the Wayback Machine 5 October 2016 by James Westrip (BirdLife)
Thayer, John E.; Bangs, Outram (1908). "The Present State of the Ornis of Guadaloupe Island" (PDF). Condor. 10 (#3): 101–106. doi:10.2307/1360977. hdl:2027/hvd.32044072250186. JSTOR 1360977.
Kaeding, Henry B. (1905). "Birds from the West Coast of Lower California and Adjacent Islands (Part II)" (PDF). Condor. 7 (#4): 134–138. doi:10.2307/1361667. JSTOR 1361667.
León de la Luz; José Luis; Rebman, Jon P. & Oberbauer, Thomas (2003). "On the urgency of conservation on Guadalupe Island, Mexico: is it a lost paradise?". Biodiversity and Conservation. 12 (#5): 1073–1082. doi:10.1023/A:1022854211166.
Anthony, A.W. (1901). "The Guadalupe Wren" (PDF). Condor. 3 (#3): 73. doi:10.2307/1361475. JSTOR 1361475.
While this was probably barely sustainable, it was certainly far more harmful that they shot "a series of flickers" and collected six clutches of eggs of an endemic subspecies of the northern flicker (Colaptes auratus). The Guadalupe red-shafted flicker (C. a. rufipileus) became extinct in 1906, possibly shortly after the survey was finished.
"– Preventing Extinctions by removing invasive species from Islands".

BirdLife International (2016). "Junco insularis". IUCN Red List of Threatened Species. 2016: e.T22721102A104279152. doi:10.2305/IUCN.UK.2016-3.RLTS.T22721102A104279152.en. Retrieved 12 January 2020.