Post-glacial population history and genetic structure of the northern clingfish (Gobbiesox maeandricus), revealed from mtDNA analysis |
| |
Authors: | M J Hickerson J R P Ross |
| |
Institution: | (1) Department of Zoology, Duke University, Durham, NC 27708, USA e-mail: mjh2@acpub.duke.edu Fax: +1-919-6846168, US;(2) Department of Biology, Western Washington University, Bellingham, WA 98225, USA, US |
| |
Abstract: | Mitochondrial d-loop sequences were analyzed to characterize the phylogeographic and population genetic structure of the
northern clingfish (Gobbiesox maeandricus Girard). Sequence analysis of 378 bp from 111 individuals sampled in 14 localities along the northeast Pacific coast and
within the Strait of Georgia from 1996 to 1999 revealed marked genetic differentiation (Φct=0.247) among regional population groupings. The gene genealogy distinguished two major clades of haplotypes separated by
at least 1.1% sequence divergence. One clade with very low haplotype diversity (h=0.2095, n=18) occurred only within the recently unglaciated Strait of Georgia. The other clade had high haplotype diversity (h=0.8808, n=93) and was found in all populations. High haplotype diversity was found in open coastal populations, both north and south
of the maximum extant of the Wisconsin ice sheet, suggesting that the clingfish range was not pushed to a southern refugium
during the last glacial maximum. A nested clade analysis also did not detect a large northward expansion from a single southern
refugium. The level of sequence divergence and coalescent-based analyses suggest that the observed patterns of polymorphism
are the result of Pleistocene diversification within multiple refugia, followed by population expansion and asymmetrical lineage
introgression.
Received: 5 February 2000 / Accepted: 31 August 2000 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|