Rapid chromosomal evolution in a morphologically cryptic radiation

Mills, Penelope J. and Cook, Lyn G. (2014) Rapid chromosomal evolution in a morphologically cryptic radiation. Molecular Phylogenetics and Evolution, 77 1: 126-135. doi:10.1016/j.ympev.2014.03.015


Author Mills, Penelope J.
Cook, Lyn G.
Title Rapid chromosomal evolution in a morphologically cryptic radiation
Journal name Molecular Phylogenetics and Evolution   Check publisher's open access policy
ISSN 1095-9513
1055-7903
Publication date 2014-08-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.ympev.2014.03.015
Open Access Status Not yet assessed
Volume 77
Issue 1
Start page 126
End page 135
Total pages 10
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Language eng
Abstract Cryptic species occur within most of the major taxonomic divisions, and a current challenge is to determine why some lineages have more cryptic species than others. It is expected that cryptic species are more common in groups where there are life histories or genetic architectures that promote speciation in the absence of apparent morphological differentiation. Chromosomal rearrangements have the potential to lead to post-zygotic isolation and might be an important factor leading to cryptic species. Here we investigate the potential role of chromosomal change in driving speciation in the karyotypically diverse scale insect genus Apiomorpha, focussing on four species placed in the same species group (the A. minor species group Gullan, 1984). Using mitochondrial and nuclear DNA sequence data, we find that Apiomorpha minor is not monophyletic and consists of at least nine cryptic species. Diploid chromosome counts range from 2n = 4 to 2n = 84 across the four currently recognized species, and some of the chromosomal variation exists in the absence of other genetic or host use differences, consistent with karyotypic changes being involved in lineage divergence and the generation of cryptic species. (C) 2014 Elsevier Inc. All rights reserved.
Formatted abstract
Cryptic species occur within most of the major taxonomic divisions, and a current challenge is to determine why some lineages have more cryptic species than others. It is expected that cryptic species are more common in groups where there are life histories or genetic architectures that promote speciation in the absence of apparent morphological differentiation. Chromosomal rearrangements have the potential to lead to post-zygotic isolation and might be an important factor leading to cryptic species. Here we investigate the potential role of chromosomal change in driving speciation in the karyotypically diverse scale insect genus Apiomorpha, focussing on four species placed in the same species group (the A. minor species group Gullan, 1984). Using mitochondrial and nuclear DNA sequence data, we find that Apiomorpha minor is not monophyletic and consists of at least nine cryptic species. Diploid chromosome counts range from 2n= 4 to 2n= 84 across the four currently recognized species, and some of the chromosomal variation exists in the absence of other genetic or host use differences, consistent with karyotypic changes being involved in lineage divergence and the generation of cryptic species.
Keyword Cryptic species
DNA sequences
Eucalyptus
Host specificity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
 
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