Arid
DOI10.1111/jbi.13057
Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape
Byrne, Margaret1; Millar, Melissa A.1; Coates, David J.1; Macdonald, Bronwyn M.1; McArthur, Shelley M.1; Zhou, Michael2; van Leeuwen, Stephen1
通讯作者Byrne, Margaret
来源期刊JOURNAL OF BIOGEOGRAPHY
ISSN0305-0270
EISSN1365-2699
出版年2017
卷号44期号:11页码:2539-2550
英文摘要

Aim: Topographically complex areas are hypothesized to be mesic refugia in arid environments during periods of climatic change. We tested the hypothesis that an elevated and topographically complex range has been a historical refugium in an arid environment during Pleistocene climatic oscillations for a widespread eucalypt.


Location: Pilbara region, north-west Australia.


Methods: We evaluated genetic diversity and differentiation in chloroplast and nuclear genomes using microsatellite loci in 20 populations of Eucalyptus leucophloia from across the distribution in the Pilbara bioregion, including two ranges with differing topographical complexity and elevation. We evaluated phylogeographical structure using Permut and Network analysis, and assessed genetic structure using principle coordinate (PCoA) and Bayesian analyses.


Results: We found moderate levels of genetic diversity and low genetic differentiation among populations, typical of widespread eucalypts. There was no evidence of genetic structure across the sampled range. Populations in both the Hamersley and Chichester ranges showed higher levels of chloroplast haplotype and nuclear diversity than those in surrounding areas. Diversity was negatively correlated with evapotranspiration, and positively correlated with precipitation.


Main conclusions: Genetic signals of high diversity and low differentiation indicated population persistence throughout historical climate change in ranges, with a signal of expansion in surrounding areas. Our analysis was consistent with the hypothesis of the elevated, topographically complex Hamersley Range acting as a refugium, but revealed an unexpected result of the lower elevation, less rugged Chichester Range also being a refugium. Our results suggest refinement to expectations of environmental characteristics that facilitate persistence, where thresholds of mesic environments for refugia may be lower than expected and moisture availability may be an important contributory aspect of elevation and topographical complexity. In contrast to patterns in reptile species, lack of genetic structure associated with geological substrate and geomorphological features indicates dispersal is not impeded by these landscape features for this widespread eucalypt.


英文关键词arid zone Australia chloroplast diversity conservation eucalypt genetic differentiation genetic diversity phylogeography Pilbara refugia
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000414077300010
WOS关键词PLEISTOCENE CLIMATIC OSCILLATIONS ; CENTRAL SAHARAN MOUNTAINS ; GENETIC-STRUCTURE ; COMPARATIVE PHYLOGEOGRAPHY ; WESTERN-AUSTRALIA ; POLLEN DISPERSAL ; PILBARA REGION ; OLEA-EUROPAEA ; ZONE ; PATTERNS
WOS类目Ecology ; Geography, Physical
WOS研究方向Environmental Sciences & Ecology ; Physical Geography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200229
作者单位1.Dept Biodivers Conservat & Attract, Sci & Conservat, Locked Bag 104,Bentley Delivery Ctr, Bentley, WA 6983, Australia;
2.POB 2660, Mt Claremont, WA 6010, Australia
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GB/T 7714
Byrne, Margaret,Millar, Melissa A.,Coates, David J.,et al. Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape[J],2017,44(11):2539-2550.
APA Byrne, Margaret.,Millar, Melissa A..,Coates, David J..,Macdonald, Bronwyn M..,McArthur, Shelley M..,...&van Leeuwen, Stephen.(2017).Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape.JOURNAL OF BIOGEOGRAPHY,44(11),2539-2550.
MLA Byrne, Margaret,et al."Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape".JOURNAL OF BIOGEOGRAPHY 44.11(2017):2539-2550.
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