Untangling a species complex of arid zone grasses (Triodia) reveals patterns congruent with co-occurring animals

Anderson, Benjamin M.; Barrett, Matthew D.; Krauss, Siegfried L.; Thiele, Kevin R.

doi:10.1016/j.ympev.2016.05.014

Cited by 28 publications

(78 citation statements)

References 81 publications

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“…E. camaldulensis (Butcher et al., ), A. ancistrocarpa and A. atkinsiana (Levy et al., ). The lack of structure associated with substrate or vegetation association is in contrast to the high level of association found in phylogenetic analysis of a number of reptile and invertebrate groups (see Pepper et al., ) and habitat specificity observed in taxa in the T basedowii species complex (Anderson et al., ).…”

Section: Discussionmentioning

confidence: 83%

“…In contrast, an analysis of E. camaldulensis across Australia found limited diversity in Pilbara populations (Butcher, McDonald, & Bell, ). Patterns of diversity in the Triodia basedowii species complex showed higher diversity in the Pilbara compared to deserts to the east suggesting the Pilbara as a centre of diversification in the Pliocene, but were inconclusive regarding Pleistocene refugia (Anderson, Barrett, Krauss, & Thiele, ).…”

Section: Discussionmentioning

confidence: 99%

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Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape

Byrne¹,

Millar²,

Coates³

et al. 2017

Journal of Biogeography

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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.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape

Byrne¹,

Millar²,

Coates³

et al. 2017

Journal of Biogeography

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“…Interestingly, however, the lack of genetic structure, and possible signatures of recent range expansion, within the phasmid gecko lineage (S. jeanae) in the AAZ is at odds with an inferred long history within this biome (Nielsen et al, 2016). This is particularly true when contrasted with the patterns observed in Triodia of elevated structure across the Pilbara (Anderson et al, 2016), as well as in other gecko taxa distributed across the AAZ (Pepper et al, 2008;. Considering evidence for a long history of Strophurus in arid biomes, we argue that the comparative patterns of genetic diversity in phasmid geckos between the AMT and AAZ biomes cannot necessarily be explained by differences in age of the two biomes (Nielsen et al, 2016).…”

Section: Definition and Evolutionary History Of Australian Biomesmentioning

confidence: 94%

“…Although some groups, including spinifex grasses, show evidence of genetic structure within rocky isolates in the AAZ, especially the Pilbara (Anderson et al, 2016;Maryan et al, 2007;Melville et al, 2011;Pepper et al, 2008;2011a), phasmid geckos show no evidence of this.…”

Section: Contrasting Distributions Across An Aridity Gradientmentioning

confidence: 99%

Trans-biome diversity in Australian grass-specialist lizards (Diplodactylidae: Strophurus)

Laver

Nielsen

Rosauer

et al. 2017

Molecular Phylogenetics and Evolution

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Comparisons of biodiversity patterns within lineages that occur across major climate gradients and biomes, can provide insights into the relative roles that lineage history, landscape and climatic variation, and environmental change have played in shaping regional biotas. In Australia, while there has been extensive research into the origins and patterns of diversity in the Australian Arid Zone (AAZ), how diversity is distributed across this biome and the Australian Monsoonal Tropics (AMT) to the north, has been less studied. We compared the timing and patterns of diversification across this broad aridity gradient in a clade of lizards (Strophurus: phasmid geckos) that only occur in association with a unique Australian radiation of sclerophyllous grasses (Triodia: spinifex). Our results indicate that overall genetic diversity is much higher, older and more finely geographically structured within the AMT, including distantly related clades endemic to the sandstone escarpments of the Kimberley and Arnhem Plateau. Niche modelling analyses also suggest that the distribution of taxa in the AMT is more strongly correlated with variation in topographic relief than in the AAZ. The two broad patterns that we recovered - (i) lineage endemism increases as latitude decreases, and (ii) endemism is tightly correlated to rocky regions - parallel and corroborate other recent studies of habitat generalists and specialised saxicoline lineages occurring across these same regions. Early Miocene diversification estimates also suggest that, soon after Triodia grasses colonised Australia and began to diversify in the Miocene, phasmid geckos with Gondwanan ancestry shifted into these grasses, and have subsequently remained closely associated with this unique vegetation type.

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“…A number of cpDNA loci have been found to be variable within species in Australia (Byrne and Hankinson, 2012) and elsewhere (Dong et al, 2012;Shaw et al, 2014). These loci have also proved valuable in assessment of relationships at lower taxonomic levels and have been used to distinguish closely related species and intraspecific taxa (Shepherd et al, 2013;Anderson et al, 2016). Ultimately, as sequencing technology continues to advance, larger and more numerous genomic regions can be applied to barcoding to improve specimen identification capabilities for specific purposes (e.g., Tonti-Filippini et al, 2017).…”

Section: Barcoding Approachesmentioning

confidence: 99%

Advancing DNA Barcoding and Metabarcoding Applications for Plants Requires Systematic Analysis of Herbarium Collections—An Australian Perspective

et al. 2018

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Untangling a species complex of arid zone grasses (Triodia) reveals patterns congruent with co-occurring animals

Cited by 28 publications

References 81 publications

Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape

Refining expectations for environmental characteristics of refugia: two ranges of differing elevation and topographical complexity are mesic refugia in an arid landscape

Trans-biome diversity in Australian grass-specialist lizards (Diplodactylidae: Strophurus)

Advancing DNA Barcoding and Metabarcoding Applications for Plants Requires Systematic Analysis of Herbarium Collections—An Australian Perspective

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