Please use this identifier to cite or link to this item: http://hdl.handle.net/2067/1714
Title: Birth of a hotspot of intraspecific genetic diversity: notes from the underground
Authors: Canestrelli, Daniele
Aloise, Gaetano
Cecchetti, Silvia
Nascetti, Giuseppe
Keywords: Gene flow;Genetic diversity;Hotspots;Multiple refugia;Talpa romana
Issue Date: 2010
Publisher: Wiley-Blackwell
Source: Canestrelli, D. et al. 2010. Birth of a hotspot of intraspecific genetic diversity: Notes from the underground. "Molecular Ecology" 19(24): 5432–5451
Abstract: 
Hotspots of intraspecific diversity have been observed in most species, often within areas of putative Pleistocene refugia. They have thus mostly been viewed as the outcome of prolonged stability of large populations within the refugia. However, recent evidence has suggested that several other microevolutionary processes could also be involved in their formation. Here, we investigate the contribution of these processes to current range-wide patterns of genetic diversity in the Italian endemic mole Talpa romana, using both nuclear (30 allozyme loci) and mitochondrial markers (cytochrome b sequences). Southern populations of this species showed an allozyme variation that is amongst the highest observed in small mammals (most populations had an expected heterozygosity of 0.10 or above), which was particularly unexpected for a subterranean species. Population genetic, phylogeographic and historical demographic analyses indicated that T. romana populations repeatedly underwent allopatric differentiations followed by secondary admixture within the refugial range in southern Italy. A prolonged demographic stability was reliably inferred from the mitochondrial DNA data only for a population group located north and east of the Calabrian peninsula, showing comparatively lower levels of allozyme variability, and lacking evidence of secondary admixture with other groups. Thus, our results point to the admixture between differentiated lineages as the main cause of the higher levels of diversity of refugial populations. When compared with the Pleistocene evolutionary history recently inferred for species from both the same and other geographic regions, these results suggest the need for a reappraisal of the role of gene exchange in the formation of intraspecific hotspots of genetic diversity.
Description: 
L'articolo è disponibile sul sito dell'editore http://onlinelibrary.wiley.com/
URI: http://hdl.handle.net/2067/1714
ISSN: 0962-1083
DOI: 10.1111/j.1365-294X.2010.04900.x
Appears in Collections:DECOS - Archivio della produzione scientifica

Files in This Item:
File Description SizeFormat
Canestrelli, Aloise, Cecchetti & Nascetti 2010.pdf72.21 kBAdobe PDFView/Open
Show full item record

Page view(s)

19
Last Week
0
Last month
4
checked on Jan 23, 2021

Download(s)

11
checked on Jan 23, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.