A fine line between sex and unisexuality: the phylogenetic constraints on parthenogenesis in lacertid lizards

Citation
Rw. Murphy et al., A fine line between sex and unisexuality: the phylogenetic constraints on parthenogenesis in lacertid lizards, ZOOL J LINN, 130(4), 2000, pp. 527-549
Citations number
59
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
ISSN journal
0024-4082 → ACNP
Volume
130
Issue
4
Year of publication
2000
Pages
527 - 549
Database
ISI
SICI code
0024-4082(200012)130:4<527:AFLBSA>2.0.ZU;2-E
Abstract
A phylogeny of Caucasian rock lizards (genus Darevskia, formerly Lacerta) w as reconstructed using mitochondrial DNA sequence and allozyme data. All 15 bisexual species grouped into three major clades: the caucasica, saxicola and rudis clades. Unisexual Darevskia originate from inter-clade hybridizat ion, never from within clades. Only two clades, the caucasica clade and the rudis clade, were involved in forming unisexuals; the saxicola clade was n ever involved. Furthermore, the hybridization is directional in that the ca ucasica clade contributed only maternal parents and the rudis clade only pa ternal parents. The formation of unisexual species is best explained by sex ually directional phylogenetic constraints. We hypothesize: that the causat ive agents are likely to be genes linked with the sex chromosomes within th e parental sexual species. (C) 2000 The Linnean Society of London.