A revision of the Triodia basedowii species complex and close relatives (Poaceae: Chloridoideae)

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

doi:10.1071/sb17011

Cited by 7 publications

(8 citation statements)

References 26 publications

(74 reference statements)

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“…The clade to which the T. basedowii complex belongs diverged prior to the bulk of diversification in Triodia and currently occupies areas in central Australia, between and overlapping the distributions of (older) southern and (more recently diverged) northern clades. The two closest relatives of the T. basedowii complex ( T. plurinervata and T. concinna ) are currently distributed on the west coast and in the central interior of Western Australia (Anderson et al 2017a), suggesting that ancestors of the T. basedowii complex likely occurred in central and western Western Australia.…”

Section: Discussionmentioning

confidence: 99%

“…The T. basedowii species complex is found across much of the central AAZ, with the bulk of its diversity in the Pilbara region of north-western Australia (Anderson et al 2016). Following a recent taxonomic revision (Anderson et al 2017a), the complex includes nine species: T. basedowii , T. lanigera , T. birriliburu , T. chichesterensis , T. glabra , T. mallota , T. nana , T. scintillans and T. vanleeuwenii . Of these nine species, only T. basedowii is widespread across sandy habitats of the AAZ, while many of the others are restricted to discrete geographic areas and substrates.…”

Section: Introductionmentioning

confidence: 99%

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Recent range expansion in Australian hummock grasses (Triodia) inferred using genotyping-by-sequencing

et al. 2019

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The Australian arid zone (AAZ) has undergone aridification and the formation of vast sandy deserts since the mid-Miocene. Studies on AAZ organisms, particularly animals, have shown patterns of mesic ancestry, persistence in rocky refugia and range expansions in arid lineages. There has been limited molecular investigation of plants in the AAZ, particularly of taxa that arrived in Australia after the onset of aridification. Here we investigate populations of the widespread AAZ grass Triodia basedowii to determine whether there is evidence for a recent range expansion, and if so, its source and direction. We also undertake a dating analysis for the species complex to which T. basedowii belongs, in order to place its diversification in relation to changes in AAZ climate and landscapes. We analyse a genomic single nucleotide polymorphism data set from 17 populations of T. basedowii in a recently developed approach for detecting the signal and likely origin of a range expansion. We also use alignments from existing and newly sequenced plastomes from across Poaceae for analysis in BEAST to construct fossil-calibrated phylogenies. Across a range of sampling parameters and outgroups, we detected a consistent signal of westward expansion for T. basedowii , originating in central or eastern Australia. Divergence time estimation indicates that Triodia began to diversify in the late Miocene (crown 7.0–8.8 million years (Ma)), and the T. basedowii complex began to radiate during the Pleistocene (crown 1.4–2.0 Ma). This evidence for range expansion in an arid-adapted plant is consistent with similar patterns in AAZ animals and likely reflects a general response to the opening of new habitat during aridification. Radiation of the T. basedowii complex through the Pleistocene has been associated with preferences for different substrates, providing an explanation why only one lineage is widespread across sandy deserts.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent range expansion in Australian hummock grasses (Triodia) inferred using genotyping-by-sequencing

et al. 2019

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“…hummock grasses are restricted to mainland Australia, where they are characteristic components of many arid and semi-arid communities, and the dominant elements of hummock grasslands that cover 18% of Australia (Department of the Environment and Heritage 2007). As at late 2018 the genus Triodia consists of 82 described and accepted species (Lazarides 1997;Barrett et al 2005;Armstrong 2008; Barrett & Barrett 2011, 2015Hurry et al 2012;Crisp et al 2015;Anderson et al 2017a;Barrett & Trudgen 2018) but is currently undergoing phylogenetic investigation and taxonomic revision (e.g. Toon et al 2015;Anderson et al 2016Anderson et al , 2017b.…”

Section: Introductionmentioning

confidence: 99%

Triodia veniciae (Poaceae), a new species from the Pilbara region, Western Australia

Barrett¹

2019

Nuytsia

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Barrett, M.D. Triodia veniciae (Poaceae), a new species from the Pilbara region, Western Australia. Nuytsia 30: 221-228 (2019). The Australian hummock grass genus Triodia R.Br. is currently undergoing taxonomic revision following increased botanical survey in remote Australia. This paper describes a recently discovered species of 'soft' Triodia from the Pilbara region, T. veniciae M.D.Barrett. The lemma lobes of the new species are narrow and produced into a short awnlet, intermediate between the old, and now united, generic concepts of Plectrachne Henrard with awned lemmas and Triodia with lobed lemmas. Triodia veniciae M.D.Barrett is only known from rocky shale slopes of the eastern Chichester Range, and has priority conservation status. Diagnostic character combinations for T. veniciae are given to allow discrimination from all other Triodia.

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“…(Poaceae) hummock grasses are restricted to mainland Australia, where they are characteristic components of many arid and semi-arid communities. As at late 2017 the genus Triodia consisted of 81 described and accepted species (Lazarides 1997;Barrett et al 2005;Armstrong 2008; Barrett & Barrett 2011;Hurry et al 2012;Barrett & Barrett 2015;Crisp et al 2015;Anderson et al 2017a). The genus is being revised by one of us (MB) in the light of material collected during botanical surveys in remote parts of Australia, and molecular phylogenetic data dissecting species complexes (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The genus is being revised by one of us (MB) in the light of material collected during botanical surveys in remote parts of Australia, and molecular phylogenetic data dissecting species complexes (e.g. Anderson et al 2016Anderson et al , 2017aAnderson et al , 2017b for the T. basedowii E.Pritz. complex).…”

Section: Introductionmentioning

confidence: 99%

Triodia pisoliticola (Poaceae), a new species from the Pilbara region, Western Australia, and a description for T. sp. Mt Ella (M.E. Trudgen MET 12739)

Trudgen¹,

Barrett²

2018

Nuytsia

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The genus Triodia R.Br. is currently undergoing taxonomic revision in the light of intensive botanical survey in remote Australia and molecular phylogenetic data. Several Triodia species have been known by phrase names in Western Australia for about 20 years. This paper deals with two of these names, Triodia sp. Mt Ella (M.E. Trudgen 12739) and T. sp. Robe River (M.E. Trudgen et al. MET 12367), that were first recognised as distinct taxa by one of us. Both species are 'soft' spinifexes with awned lemmas, and are known only from the Pilbara region in Western Australia. Triodia sp. Robe River is formally described as T. pisoliticola Trudgen & M.D.Barrett. This species is restricted to the western part of the Pilbara bioregion and has flowers morphologically similar to T. melvillei (C.E.Hubb.) Lazarides. Triodia sp. Mt Ella has floral parts morphologically similar to T. bitextura Lazarides; a full description of this entity is given, but it is not formally named pending further revision of the T. bitextura complex across northern Australia. Both taxa are currently given a conservation ranking of Priority Three. Both taxa are illustrated, and diagnostic character combinations are given to allow discrimination from all other Pilbara Triodia species.

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A revision of the Triodia basedowii species complex and close relatives (Poaceae: Chloridoideae)

Cited by 7 publications

References 26 publications

Recent range expansion in Australian hummock grasses (Triodia) inferred using genotyping-by-sequencing

Recent range expansion in Australian hummock grasses (Triodia) inferred using genotyping-by-sequencing

Triodia veniciae (Poaceae), a new species from the Pilbara region, Western Australia

Triodia pisoliticola (Poaceae), a new species from the Pilbara region, Western Australia, and a description for T. sp. Mt Ella (M.E. Trudgen MET 12739)

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