Speciation through chromosomal fusion and fission in Lepidoptera

de Vos, Jurriaan M. and Augustijnen, Hannah and Baetscher, Livio and Lucek, Kay. (2020) Speciation through chromosomal fusion and fission in Lepidoptera. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 375 (1806). p. 20190539.

[img] PDF - Accepted Version

Official URL: https://edoc.unibas.ch/78157/

Downloads: Statistics Overview


Changes in chromosome numbers may strongly affect reproductive barriers, because individuals heterozygous for distinct karyotypes are typically expected to be at least partially sterile or to show reduced recombination. Therefore, several classic speciation models are based on chromosomal changes. One import mechanism generating variation in chromosome numbers is fusion and fission of existing chromosomes, which is particularly likely in species with holocentric chromosomes, i.e. chromosomes that lack a single centromere. Holocentric chromosomes evolved repeatedly across the tree of life, including in Lepidoptera. Although changes in chromosome numbers are hypothesized to be an important driver of the spectacular diversification of Lepidoptera, comparative studies across the order are lacking. We performed the first comprehensive literature survey of karyotypes for Lepidoptera species since the 1970s and tested if, and how, chromosomal variation might affect speciation. Even though a meta-analysis of karyological differences between closely related taxa did not reveal an effect on the degree of reproductive isolation, phylogenetic diversification rate analyses across the 16 best-covered genera indicated a strong, positive association of rates of chromosome number evolution and speciation. These findings suggest a macroevolutionary impact of varying chromosome numbers in Lepidoptera and likely apply to other taxonomic groups, especially to those with holocentric chromosomes. This article is part of the theme issue 'Towards the completion of speciation: the evolution of reproductive isolation beyond the first barriers'.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Pflanzenökologie und -evolution (Willi)
05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:de Vos, Jurriaan M. and Augustijnen, Hannah and Bätscher, Livio and Lucek, Kay
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:The Royal Society Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
edoc DOI:
Last Modified:20 Jan 2021 08:53
Deposited On:22 Dec 2020 09:22

Repository Staff Only: item control page