It was originally proposed that the radiation occurred around 3.5 million years ago, when an ancestral form, perhaps similar to the modern-day black-headed siskin, was able to adaptively radiate into South America. In this version of events, the dispersal into South America happened before the isthmus of Panama was complete (around 2.7 million years ago), but when mesothermal montane plant species were able to disperse across the narrowing strait. The novel plant communities in South America would have created many new niches into which the ancestral species adaptively radiated.[2]
More recent work suggests the species radiation happened much later, within the last 1 million years, and posits the radiation happened due to climate change in the late Pleistocene. The changing climate could have fragmented various habitats in the Andes, initiating allopatric speciation.[3]
Spinus notatus passing the Isthmus of Panama when it was closed[2]
References
^BirdLife International (2020). "Spinus notatus". IUCN Red List of Threatened Species. 2020: e.T22720392A139224440. doi:10.2305/IUCN.UK.2020-3.RLTS.T22720392A139224440.en. Retrieved 12 November 2021.
^ abcArnaiz-Villena, A; Alvarez-Tejado M; Ruiz-del-Valle V; Garcia-de-la-Torre C; Varela P; Recio MJ; Ferre S; Martinez-Laso J (1998). "Phylogeny and rapid northern and southern hemisphere speciation of goldfinches during the Miocene and Pliocene epochs" (PDF). Cell. Mol. Life Sci. 54 (9): 1031–41. doi:10.1007/s000180050230. PMID 9791543. S2CID 10654775.
^Beckman, Elizabeth J.; Witt, Christopher C. (1 June 2015). "Phylogeny and biogeography of the New World siskins and goldfinches: Rapid, recent diversification in the Central Andes". Molecular Phylogenetics and Evolution. 87: 28–45. doi:10.1016/j.ympev.2015.03.005. ISSN 1055-7903. PMID 25796324.
Further reading
This Fringillidae-related article is a stub. You can help Wikipedia by expanding it.
black, headed, siskin, black, headed, siskin, spinus, notatus, also, known, jonny, species, finch, family, fringillidae, found, mexico, belize, salvador, guatemala, honduras, nicaragua, natural, habitats, subtropical, tropical, moist, montane, forest, heavily,. The black headed siskin Spinus notatus also known as the Jonny Bee is a species of finch in the family Fringillidae It is found in Mexico Belize El Salvador Guatemala Honduras and Nicaragua Its natural habitats are subtropical or tropical moist montane forest and heavily degraded former forest Black headed siskinConservation statusLeast Concern IUCN 3 1 1 Scientific classificationKingdom AnimaliaPhylum ChordataClass AvesOrder PasseriformesFamily FringillidaeSubfamily CarduelinaeGenus SpinusSpecies S notatusBinomial nameSpinus notatusDu Bus de Gisignies 1847SynonymsCarduelis notataEvolution and systematics EditThis species is part of a rapid recent adaptive radiation of Spinus finches in Central and South America which produced at least eight other recognized species S atratus S crassirostris S spinescens S yarrellii S magellanicus S olivaceus S xanthogastrus and S barbatus The black headed siskin was the earliest of these species to diverge 2 It was originally proposed that the radiation occurred around 3 5 million years ago when an ancestral form perhaps similar to the modern day black headed siskin was able to adaptively radiate into South America In this version of events the dispersal into South America happened before the isthmus of Panama was complete around 2 7 million years ago but when mesothermal montane plant species were able to disperse across the narrowing strait The novel plant communities in South America would have created many new niches into which the ancestral species adaptively radiated 2 More recent work suggests the species radiation happened much later within the last 1 million years and posits the radiation happened due to climate change in the late Pleistocene The changing climate could have fragmented various habitats in the Andes initiating allopatric speciation 3 Spinus notatus passing the Isthmus of Panama when it was closed 2 References Edit BirdLife International 2020 Spinus notatus IUCN Red List of Threatened Species 2020 e T22720392A139224440 doi 10 2305 IUCN UK 2020 3 RLTS T22720392A139224440 en Retrieved 12 November 2021 a b c Arnaiz Villena A Alvarez Tejado M Ruiz del Valle V Garcia de la Torre C Varela P Recio MJ Ferre S Martinez Laso J 1998 Phylogeny and rapid northern and southern hemisphere speciation of goldfinches during the Miocene and Pliocene epochs PDF Cell Mol Life Sci 54 9 1031 41 doi 10 1007 s000180050230 PMID 9791543 S2CID 10654775 Beckman Elizabeth J Witt Christopher C 1 June 2015 Phylogeny and biogeography of the New World siskins and goldfinches Rapid recent diversification in the Central Andes Molecular Phylogenetics and Evolution 87 28 45 doi 10 1016 j ympev 2015 03 005 ISSN 1055 7903 PMID 25796324 Further reading Edit This Fringillidae related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Black headed siskin amp oldid 1123671669, wikipedia, wiki, book, books, library,
