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Darwin Finches (1 Viewer)

Peter Kovalik

Peter Kovalik

Well-known member
Slovakia
Akie Sato, Herbert Tichy, Peter R. Grant, B. Rosemary Grant, Tetsuji Sato, and Colm O'hUigin, 2011. Spectrum of MHC class II variability in Darwin Finches and Their Close Relatives. Mol Biol Evol.
Abstract
 
Medium Ground Finch

De León, Raeymaekers, Bermingham, Podos, Herrel & Hendry 2011. Exploring possible human influences on the evolution of Darwin's finches. Evolution: in press.
onlinelibrary.wiley.com/doi/10.1111/j.1558-5646.2011.01297.x/abstract

De León, Bermingham, Podos & Hendry 2010. Divergence with gene flow as facilitated by ecological differences: within-island variation in Darwin's finches. Phil Trans R Soc B 365(1543): 1041-1052.
rstb.royalsocietypublishing.org/content/365/1543/1041
​
 
Small Ground Finch

Galligan, Donnellan, Sulloway, Fitch, Bertozzi & Kleindorfer (in press). Panmixia supports divergence with gene flow in Darwin's small ground finch, Geospiza fuliginosa, on Santa Cruz, Galápagos Islands. Mol Ecol. [abstract]
 
Medium Ground Finch

Podos, Dybboe & Jensen (in press). Ecological speciation in Darwin's finches: Parsing the effects of magic traits. Curr Zool. [pdf]
 
Chris M Rands, Aaron Darling, Matthew Fujita, Lesheng Kong, Matthew T Webster, Céline Clabaut, Richard D Emes, Andreas Heger, Stephen Meader, Michael Brent Hawkins, Michael B Eisen, Clotilde Teiling, Jason Affourtit, Benjamin Boese, Peter R Grant, Barbara Rosemary Grant, Jonathan A Eisen, Arhat Abzhanov, Chris P Ponting. Insights into the evolution of Darwin’s finches from comparative analysis of the Geospiza magnirostris genome sequence. BMC Genomics 2013, 14:95 (12 February 2013)
PDF
 
Tree finches

Kleindorfer, O'Connor, Dudaniec, Myers, Robertson & Sulloway 2014. Species collapse via hybridization in Darwin's tree finches. Am Nat 183(3): 325–341. [abstract] [pdf]

[With thanks to cwbirder for reporting. :t:]
 
Richard Klim said:
Kleindorfer, O'Connor, Dudaniec, Myers, Robertson & Sulloway 2014. Species collapse via hybridization in Darwin's tree finches. Am Nat 183(3): 325–341. [abstract] [pdf]

[With thanks to cwbirder for reporting. :t:]
Click to expand...

The Galapagos could be described as a small closed system, a natural biological laboratory, large enough to sustain higher-order communities of limited breadth, but vulnerable all the same to the 'island effect' of isolation from more diverse communities - in this case to the introduced parasite Philornis downsi, (found to be present there in 1997).

The authors suggest that the novel genetic combinations introduced through finch taxa hybridization may confer an immunological advantage or parasite resistance - in other words, new niches...
MJB
 
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Richard Klim said:
Mike, Darwin was obviously a sucker for that typical tour company hype. ;)
Click to expand...

Well, a book I recently read states that Darwin actually did not use examples from Galapagos in developing or at least in presenting the "Origin" -- possibly because his specimen were not (at least not all of them) labeled with which island they came from.

Niels
 
You're right, he didn't use Darwin's finches (or Galapagos finches as they were then called) because he didn't label which islands the specimens came from, but he did use Galapagos mockingbirds as examples.
 
one could also argue that none of those tree finches reached a level of genetic/morphological distinctiveness worthy of species recognition.
 
De León et al

De León, Podos, Gardezi, Herrel & Hendry (in press). Darwin's finches and their diet niches: the sympatric coexistence of imperfect generalists. J Evol Biol. [abstract]
 
Hybridisation

Chaves, Hendry, Cooper, Podos & Uy. Genomic consequences of introgressive hybridization in Darwin's Finches adaptive radiation. Evolution 2014. (p242)
Hybridizing species complexes provide one of the richest natural experiments in evolutionary biology. Interspecific hybridization can break up co-adapted genes, disrupt local adaptation and produce genomic extinction. But it could also be viewed as a creative force behind species formation, particularly at differing levels of gene flow in a so-called "mosaic of speciation". Here we explore the genomic consequences of introgressive hybridization in a hybridizing complex of closely related Darwin ground Finches. We identified more than 41,000 SNPs across the three sympatric species of ground finches (Geospiza fuliginosa, G. fortis, G. magnirostris), including the two distinct fortis morphs. We found that despite high levels of gene flow across all species, we could detect ~600 species-specific SNPs associated to "conventional" morphological categories, but no association was found when these SNPs where chosen randomly. These findings suggest genetic permeability across "porous" species boundaries where neutral loci can move freely but putative naturally selected loci get trapped. We suggest the importance of species bridges in creating and maintaining species identities and stress the important role of introgressive hybridization behind the radiation of Darwin’s Finches.
Click to expand...
[With thanks to Nick Sly.]
​
 
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