Assessing the influence of life form and life cycle on the response of desert plants to past climate change: Genetic diversity patterns of an herbaceous lineage of<i>Nolana</i>along western South America

Ossa, Paulina G.; Armestó, Juan J.; Pérez, Fernánda

doi:10.3732/ajb.1700101

Cited by 7 publications

(5 citation statements)

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“…Based on populations from these refugia, an expansion southward from northern populations and a parallel expansion northward from southern populations with subsequent colonizations inland (as shown by our ancestral area reconstruction) seems plausible. Similar expansion events have been reported for, e.g., Nolana (Ossa et al, 2013, 2017). A scenario of isolated refugia could be understood as a more extreme form of the present‐day isolated lomas separated by hyperarid habitat (Rundel et al, 1991), which reconnect to become more continuous during climatically favorable periods, and the diversification processes of species under these circumstances seems compatible with the extremely short time periods of diversification that we obtained from our study.…”

Section: Discussionsupporting

confidence: 86%

Quaternary diversification of a columnar cactus in the driest place on earth

Merklinger

Böhnert

Arakaki

et al. 2021

American J of Botany

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Premise The cactus family (Cactaceae) is a speciose lineage with an almost entirely New World distribution. The genus Eulychnia with eight currently recognized species is endemic to the Atacama and Peruvian Deserts. Here we investigated the phylogeny of this group based on a complete taxon sampling to elucidate species delimitation and biogeographic history of the genus. Methods A family‐wide Bayesian molecular clock dating based on plastid sequence data was conducted to estimate the age of Eulychnia and its divergence from its sister genus Austrocactus. A second data set obtained from genotyping by sequencing (GBS) was analyzed, using the family‐wide age estimate as a secondary calibration to date the GBS phylogeny using a penalized likelihood approach. Ancestral ranges were inferred employing the dispersal extinction cladogenesis approach. Results Our GBS phylogeny of Eulychnia was fully resolved with high support values nearly throughout the phylogeny. The split from Austrocactus occurred in the late Miocene, and Eulychnia diversified during the early Quaternary. Three lineages were retrieved: Eulychnia ritteri from Peru is sister to all Chilean species, which in turn fall into two sister clades of three and four species, respectively. Diversification in the Chilean clades started in the early Pleistocene. Eulychnia likely originated at the coastal range of its distribution and colonized inland locations several times. Conclusions Diversification of Eulychnia during the Pleistocene coincides with long periods of hyperaridity alternated with pluvial phases. Hyperaridity caused habitat fragmentation, ultimately leading to speciation and resulting in the current allopatric distribution of taxa.

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Section: Discussionsupporting

confidence: 86%

Quaternary diversification of a columnar cactus in the driest place on earth

Merklinger

Böhnert

Arakaki

et al. 2021

American J of Botany

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“…We found a complex evolutionary history for these taxa comparing neutral and outlier data sets from P. depauperata and P. integrifolia. Here, we described a general pattern for local adaptation to a new environment that could be expanded to other coastal habitats and species in South America since all these regions were under the same Pleistocene influence (e.g., Hewitt, 2000;Ossa et al, 2017;Sujii et al, 2019).…”

Section: Neutral and Outlier Loci Tell Us Not So Different Historiesmentioning

confidence: 99%

“…Several coastal species have originated from ancestors that grow in nonsaline conditions and secondarily colonized the coastal environments (e.g., Cazé et al, 2016; Mäder et al, 2013; Meireles & Manos, 2018). In coastal regions, it is common to observe a central periphery diversity pattern with populations from the distribution edges being the most divergent (e.g., Ossa et al, 2017; Palma‐Silva et al, 2009; Pinheiro et al, 2011; Salgueiro et al, 2004; Silva‐Arias et al, 2017). The coastal species are also subjected to many soil constraints, such as sandiness, high acidity, low nutrient content, and flooding, which strongly limit plant growth (Marques et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Pleistocene climate events substantially impacted the distribution and diversification of many coastal species, influencing gene flow (e.g., Meireles & Manos, 2018;Salgueiro et al, 2004) and population size (e.g., Lira et al, 2003;Ossa et al, 2013Ossa et al, , 2017Palma-Silva et al, 2009;Pinheiro et al, 2011). Other coastal species showed some demographic stability facing the Quaternary cycles (e.g., Goetze et al, 2018;Jakob et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Neutral and outlier single nucleotide polymorphisms disentangle the evolutionary history of a coastal Solanaceae species

et al. 2022

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Speciation begins with the isolation of some individuals or subpopulations due to drivers promoting a diverging genetic distribution. Such isolation may occur, followed by different processes and pressures. Isolation-by-distance (IBD), isolation-by-adaptation (IBA), and isolation-by-colonization (IBC) have been recognized as the main divergence patterns. Still, it is not easy to distinguish which one is the main pattern as each one may act at different points in time or even simultaneously. Using an extensive genome coverage from a Petunia species complex with coastal and inland distribution and multiple analytical approaches on population genomics and phylogeography, we showed a complex interplay between neutral and selective forces acting on the divergence process. We found 18,887 SNPs potentially neutral and 924 potentially under selection (outlier) loci. All analyses pointed that each subspecies displays its own genetic component and evolutionary history. We suggested plausible ecological drivers for such divergence in a southernmost South Atlantic coastal plain in Brazil and Uruguay and identified a connection between adaptation and environment heterogeneity.

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“…While a number of botanical and biogeographical studies on the Atacama Desert has recently been published (e.g., Böhnert et al, 2019, 2020; Dillon et al, 2009; Luebert, 2011; Luebert et al, 2009, 2011), very few studies have so far focused on population genetics and plant population structure in relation to geological and climatological events (e.g., Baranzelli et al, 2014; Luebert et al, 2014; Ossa et al, 2013, 2017; Viruel et al, 2012), and even less have studied population dynamics of plants distributed across the hyper-arid core of the Atacama Desert (Merklinger et al, 2020, Koch et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Genome-wide SNP data reveal recent population structure ofHuidobria fruticosa(Loasaceae), a paleo-endemic lineage from the Atacama Desert

Merklinger,

Zheng,

Böhnert

et al. 2023

Preprint

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The Atacama Desert is a biodiversity hotspot of neo-endemic radiation, where long-term aridity and complex physiographic processes create a unique environmental setting. Current species assemblages are mainly concentrated in highly patchy loma formations, and plant populations occurring in these are often geographically isolated from each other. Despite a general consensus on long-term aridity in the Atacama, climatological and geological evidence points to repeated climate change, making the Atacama Desert an ideal system for studying population genetic processes in highly unstable habitats. We are analyzing the genetic structure within and between populations ofHuidobria fruticosa, a paleo-endemic lineage of the Atacama Desert, to shed new light on its biogeographic history and broaden our understanding of the evolution of life in extreme aridity, as well as plant evolution in response to a changing environment. To do this, we analyzed SNP data from genotyping-by-sequencing of 354 individuals from 21 populations. Our results suggest that, despite being an ancient lineage, the current population structure ofHuidobria fruticosaonly reflects changing abiotic conditions over the last 2 million years. We therefore conclude that the present distribution, together with the evolutionary processes documented here, is the result of climatic fluctuations and prolonged periods of hyperaridity during the Pleistocene. Building on this understanding, our findings contribute to a global narrative that highlights the complex interplay between climate change and evolutionary dynamics, and emphasize the importance of deserts as living laboratories for deciphering how species have historically adapted to some of the most extreme habitats on Earth.

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Assessing the influence of life form and life cycle on the response of desert plants to past climate change: Genetic diversity patterns of an herbaceous lineage ofNolanaalong western South America

Cited by 7 publications

References 77 publications

Quaternary diversification of a columnar cactus in the driest place on earth

Quaternary diversification of a columnar cactus in the driest place on earth

Neutral and outlier single nucleotide polymorphisms disentangle the evolutionary history of a coastal Solanaceae species

Genome-wide SNP data reveal recent population structure ofHuidobria fruticosa(Loasaceae), a paleo-endemic lineage from the Atacama Desert

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