Polyploidy linked with species richness but not diversification rates or niche breadth in Australian Pomaderreae (Rhamnaceae) DOI Creative Commons
Francis J. Nge, Timothy Hammer, Thaís Vasconcelos

et al.

Annals of Botany, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 23, 2024

Abstract Background and Aims Polyploidy is an important evolutionary driver for plants has been linked with higher species richness increases in diversification rate. These correlations between ploidy plant radiations could be the result of polyploid lineages exploiting broader niche space novel niches due to their enhanced adaptability. The evolution its link across Australian continent not well understood. Here, we focus on Australasian Rhamnaceae tribe Pomaderreae. Methods We generated a densely sampled phylogeny (90 %, 215/240 species) used it test ploidy. obtained 30 orthologous nuclear loci per sample dated using treePL. Ploidy estimates each sequenced were nQuire, based phased sequence data. MiSSE obtain tip rates tested significant relationships also assessed level breadth, distributional records, modelling WorldClim Key Results extensive tribe, almost half (45 %) majority genera exhibiting this trait. found positive relationship polyploidy genus size (i.e. richness), but non-significant rates. did significantly wider occupancy Pomaderreae; however, allow transitions into wetter niches. Spatially, eastern Australia hotspot Pomaderreae contrast south-west Western Australia. Conclusions complex. Ancient polyploidization events likely played role species-rich genera. A lag time effect may explain uncoupling extant lineages. Further studies other groups are required validate these hypotheses.

Language: Английский

Australian biogeography, climate-dependent diversification and phylogenomics of the spectacular Chamelaucieae tribe (Myrtaceae) DOI Creative Commons
Francis J. Nge, Ed Biffin, Barbara Lynette Rye

et al.

Australian Systematic Botany, Journal Year: 2025, Volume and Issue: 38(1)

Published: Feb. 21, 2025

Chamelaucieae is a diverse tribe in Myrtaceae with ~800 species 37 genera distributed across Australia. We applied target capture sequencing using the Angiosperms353 probe set for 131 taxa as part of Genomics Australian Plants initiative. Sampling all (36) from 10 11 named subtribes, we present phylogenomic analysis tribe. This approach has allowed us to better resolve subtribal relationships tribe, resulting an updated classification and additional subtribe (total 12 subtribes including Triplarininae). Despite these advances, phylogenetic placements Stenostegiinae, Astarteinae, Micromyrtinae remain equivocal resolution should be focus future research. constructed dated phylogeny this genomic dataset investigate tribe’s biogeographic history diversification dynamics. estimate that crown radiation occurred Eocene (c. 42 Ma), ancestral area origin Australia unresolved. Subsequent divergence mostly south-west Western frequent dispersals there into semi-arid arid interior since Miocene (20 Ma). Dispersals out northern eastern were limited confined dispersal events interior. Using paleoenvironmental models show after initial radiation, declined rapidly until Eocene–Oligocene boundary extinction pulse event subsequently more slowly present, modest increase during Middle Climatic Optimum. No significant rate shifts detected within clades except Chamelauciinae. There was no geographic-dependent Our results add growing literature revealing high plant diversity due time accumulation attributed long-term climatic stability rather than elevated rates.

Language: Английский

Citations

0
Vegetation changes through stadial and interstadial stages of MIS 4 and MIS 3 based on a palynological analysis of the Girraween Lagoon sediments of Darwin, Australia DOI Creative Commons
Cassandra Rowe, Michael Brand, Christopher M. Wurster

et al.

Palaeogeography Palaeoclimatology Palaeoecology, Journal Year: 2024, Volume and Issue: 642, P. 112150 - 112150

Published: March 16, 2024

A palynological record from Girraween Lagoon sediments (Darwin region of the Northern Territory, Australia) provides detailed long-term insight into tropical savanna vegetation community patterns, climatic and fire relationships, through Marine Isotope Stage 4 (MIS 4: 71–57 thousand years ago, ka) 3 3: 57–29 ka). Owing to a lack data in reconstructing northern Australian environments, this paper looks define describe greater degree nature scope these stadial interstadial stages for region. simultaneously proximal palaeoecological time Aboriginal people's first arrival Australia, also encompassing late Pleistocene continental decline megafauna. This study dataset enabling full exploration people-landscape faunal-floral interactions. Sea levels associated variations imposed on transportation moisture heat, held implications MIS monsoon strength, which was particularly consequential regional ecology. Results reveal prolonged transition wooded- grassy-savanna, cool drier semi-arid savanna. Increasingly episodic delivery influenced permanency freshwater landscape.

Language: Английский

Citations

3
Recent speciation and adaptation to aridity in the ecologically diverse Pilbara region of Australia enabled the native tobaccos (Nicotiana; Solanaceae) to colonize all Australian deserts DOI Creative Commons
Luiz Augusto Cauz‐Santos, Rosabelle Samuel, Dominik Metschina

et al.

Molecular Ecology, Journal Year: 2024, Volume and Issue: 33(18)

Published: Aug. 16, 2024

Abstract Over the last 6 million years, arid Australian Eremaean Zone (EZ) has remained as dry it is today. A widely accepted hypothesis suggests that flora and fauna of regions were more broadly distributed before aridification began. In Australia, this process started around 20 years ago (Ma), leading to gradual speciation climate became increasingly arid. Here, we use genomic data investigate biogeography timing divergence native allotetraploid tobaccos, Nicotiana section Suaveolentes (Solanaceae). The original migrants from South America adapted mesic areas Australia recently radiated in EZ, including sandy dune fields (only 1.2 Ma old), after developing drought adaptations. Coalescent maximum likelihood analyses suggest arrived on continent Ma, with ancestors Pilbara (Western Australian) lineages radiating there at onset extreme aridity 5 by locally adapting these various ancient, highly stable habitats. thus served both a refugium cradle for adaptations harsher conditions, due its high topographical diversity, providing microhabitats varying moisture levels proximity ocean, which buffers against aridity. This enabled species like survive refugia subsequently adapt conditions. These results demonstrate initially poorly plant groups can develop novel situ, permitting extensive rapid dispersal despite variable unpredictable conditions EZ.

Language: Английский

Citations

2
Rise and fall of a continental mesic radiation in Australia: spine evolution, biogeography, and diversification of Cryptandra (Rhamnaceae: Pomaderreae) DOI Creative Commons
Francis J. Nge, Jürgen Kellermann, Ed Biffin

et al.

Botanical Journal of the Linnean Society, Journal Year: 2023, Volume and Issue: 204(4), P. 327 - 342

Published: Oct. 14, 2023

Abstract The Australian continent has experienced progressive aridification since the Miocene, spurring recent radiations of arid-adapted lineages and likely decline mesic biotic groups. While examples former have been relatively well-documented, post-Miocene declines non-arid sclerophyllous floras are less well understood. Here, we present a well-sampled time-calibrated nuclear phylogeny (140 accessions representing 60/65 species) an plant genus (Cryptandra Sm.: Rhamnaceae) using ancestral range reconstructions diversification analyses, elucidate its evolutionary history through space time. We used high-throughput sequencing to recover 30 orthologous loci BioGeoBEARS infer areas. show that present-day distribution Cryptandra can be explained by multiple vicariance events followed in situ with little exchange between regions. All models speciation rate after radiation Miocene (c. 23 Mya). This coincides episodes across Australia indicates this negatively affected expansion aridity. also there were no significant differences rates spinescent non-spinescent lineages, suggesting may legacies selection from extinct megaherbivores.

Language: Английский

Citations

4
Recent speciation and adaptation to aridity in the ecologically diverse Pilbara region of Australia enabled the native tobaccos (Nicotiana; Solanaceae) to colonize all Australian deserts DOI Creative Commons
Luiz Augusto Cauz‐Santos, Rosabelle Samuel, Dominik Metschina

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: June 14, 2024

For the last six million years, arid Australian Eremaean Zone (EZ) has been as dry today. A hypothesis, applied to regions worldwide, suggests that flora and fauna were more broadly distributed before aridification began. In Australia, this process started around 20 years ago (Mya), leading gradual speciation processes via vicariance climate became increasingly arid. Here, we use genomic data investigate biogeography timing of divergence native allotetraploid tobaccos, Nicotiana section Suaveolentes (Solanaceae), which putatively entered EZ 5 Mya. The original migrants from South America adapted mesic areas Australia radiated recently in EZ, including sandy dune fields (only 1.2 My old), after developing drought adaptations. Based on coalescent maximum likelihood analyses designed corroborate radiation independently, arrival continent occurred approximately 6 Mya, ancestors Pilbara (Western Australian) lineages there at onset extreme aridity Mya by locally adapting these various ancient, highly stable habitats. thus served both a refugium cradle for adaptations harsher conditions. This dual role is due its high topographical diversity, providing microhabitats with varying moisture levels, proximity ocean, buffers against aridity. Consequently, species like have able survive refugia during periods subsequently adapt These results demonstrate initially poorly plant groups can develop novel situ, permitting extensive rapid wide dispersal despite variable unpredictable extremes heat EZ.

Language: Английский

Citations

1
Polyploidy linked with species richness but not diversification rates or niche breadth in Australian Pomaderreae (Rhamnaceae) DOI Creative Commons
Francis J. Nge, Timothy Hammer, Thaís Vasconcelos

et al.

Annals of Botany, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 23, 2024

Abstract Background and Aims Polyploidy is an important evolutionary driver for plants has been linked with higher species richness increases in diversification rate. These correlations between ploidy plant radiations could be the result of polyploid lineages exploiting broader niche space novel niches due to their enhanced adaptability. The evolution its link across Australian continent not well understood. Here, we focus on Australasian Rhamnaceae tribe Pomaderreae. Methods We generated a densely sampled phylogeny (90 %, 215/240 species) used it test ploidy. obtained 30 orthologous nuclear loci per sample dated using treePL. Ploidy estimates each sequenced were nQuire, based phased sequence data. MiSSE obtain tip rates tested significant relationships also assessed level breadth, distributional records, modelling WorldClim Key Results extensive tribe, almost half (45 %) majority genera exhibiting this trait. found positive relationship polyploidy genus size (i.e. richness), but non-significant rates. did significantly wider occupancy Pomaderreae; however, allow transitions into wetter niches. Spatially, eastern Australia hotspot Pomaderreae contrast south-west Western Australia. Conclusions complex. Ancient polyploidization events likely played role species-rich genera. A lag time effect may explain uncoupling extant lineages. Further studies other groups are required validate these hypotheses.

Language: Английский

Citations

1