Biogeography of North Pacific Isoëtes (Isoëtaceae) inferred from nuclear and chloroplast DNA sequence data

Kim, Changkyun; Choi, Hong‐Keun

doi:10.1007/s12374-016-0123-3

Cited by 10 publications

(23 citation statements)

References 43 publications

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“…The global distribution of extant Isoetes indicates that this lineage was able to successfully colonise the globe in a relatively short amount of time. This is contrary to the conclusions in previous studies that present Isoetes distributions are explained by vicariance due to continental drift[18,51, 52], based on older estimates for the age of the Isoetes crown 590 node. The geographic disparity within several of the major subclades of Isoetes -such as Larsen and Rydin's[18] Clade B containing Mediterranean North American and Indian species -indicates that long distance dispersal events have likely been relatively common in the Cenozoic Isoetes.…”

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confidence: 99%

“…Recent molecular dating studies suggest an origin of extant Isoetes species in the Triassic to Jurassic, with species distributions consistent with the breakup of the Gondwana 115 supercontinent [18,51,52]. These studies were, however, based on a limited number of markers, mainly from the chloroplast genomes, where high rate variation can make dating estimates strongly dependent on molecular clock model assumptions [24], a potentially significant source of error given the ancient divergence between Isoetes and its sister group Selaginella [44,53].…”

Section: Introductionmentioning

confidence: 99%

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Phylogenomics supports a Cenozoic rediversification of the “living fossil” Isoetes

Wood

Besnard

Beerling

et al. 2019

Preprint

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The fossil record provides an invaluable insight into the temporal origins of extant lineages of 20 organisms. However, establishing the relationships between fossils and extant lineages can be difficult in groups with low rates of morphological change over time. Molecular dating can potentially circumvent this issue by allowing distant fossils to act as calibration points, but rate variation across large evolutionary scales can bias such analyses. In this study, we apply multiple dating methods to genome-wide datasets to infer the origin of extant species of 25 Isoetes, a group of mostly aquatic and semi-aquatic isoetalean lycopsids, which closely resemble fossil forms dating back to the Triassic. Rate variation observed in chloroplast genomes hampers accurate dating, but genome-wide nuclear markers place the origin of extant diversity within this group in the mid-Paleogene, 45-60 million years ago. Our genomic analyses coupled with a careful evaluation of the fossil record indicate that despite resembling 30 forms from the Triassic, extant Isoetes species do not represent the remnants of an ancient and widespread group, but instead have spread around the globe in the relatively recent past.

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confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phylogenomics supports a Cenozoic rediversification of the “living fossil” Isoetes

Wood

Besnard

Beerling

et al. 2019

Preprint

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“…Isoёtes japonica distributed in Japan and I. durieui distributed in Turkey along the Mediterranean coast and in France are all the reticulate type. However, in previous molecular phylogenetic analyses, these two species show a distant relationship (Larsén and Rydin, 2016;Kim and Choi, 2016). Thus, the morphological features and similarity of the spores in Isoёtes are interpreted as a result of convergent evolution.…”

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confidence: 89%

“…Although the surface ornamentation of the spores is useful for identifying species, it does not reflect the phylogeny of Isoёtes at all. For example, I. echinospora complex that shows echinate ornamentation of megaspore, did not form a monophyletic group including all species of the complex (Kim and Choi, 2016). Isoёtes japonica distributed in Japan and I. durieui distributed in Turkey along the Mediterranean coast and in France are all the reticulate type.…”

mentioning

confidence: 95%

“…Extensive research has been carried out, including studies on the growth environment for the preservation and restoration of endangered species as well as studies involving population genetic diversity analyses using various molecular markers such as random amplification of polymorphic DNA, amplified fragment length polymorphism (AFLP), and nucleotide and chloroplast DNA sequences (Kang et al, 2005;Kim et al, 2008Kim et al, , 2009bJung et al, 2014). Some of the studies have also been focused on speciation mechanisms of parental species via polyploidization (Kim et al, 2010b), and addressed their phylogenetic relationships and biogeographical origins (Kim and Choi, 2016).…”

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confidence: 99%

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Molecular phylogeny and the biogeographic origin of East Asian Isoёtes (Isoёtaceae)

Choi¹,

Jung²,

Na³

et al. 2018

Korean J. Pl. Taxon

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Isoёtes L. (Isoёtaceae) is a cosmopolitan genus of heterosporous lycopods containing ca. 200 species being found in lakes, streams, and wetlands of terrestrial habitats. Despite its ancient origin, worldwide distribution, and adaptation to diverse environment, species in Isoёtes show remarkable morphological simplicity and convergence. Allopolyploidy appears to be a significant speciation process in the genus. These characteristics have made it difficult to assess the phylogenetic relationships and biogeographic history of Isoёtes species.

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No phylogenomic support for a Cenozoic origin of the “living fossil” Isoetes

Wikström

Larsén

Khodabandeh

et al. 2023

American J of Botany

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Premise:The isoetalean lineage has a rich fossil record that extends to the Devonian, but the age of the living clade is unclear. Recent results indicate that it is young, from the Cenozoic, whereas earlier work based on less data from a denser taxon sampling yielded Mesozoic median ages. Methods: We analyzed node ages in Isoetes using two genomic data sets (plastome and nuclear ribosomal cistron), three clock models implemented in MrBayes (ILN, WN, and TK02 models), and a conservative approach to calibration. Results: While topological results were consistently resolved in Isoetes estimated crown group ages range from the latest Paleozoic (mid-Permian) to the Mesozoic depending on data type and clock model. The oldest estimates were retrieved using the autocorrelated TK02 clock model. An (early) Cenozoic age was only obtained under one specific condition (plastome data analyzed with the uncorrelated ILN clock model). That same plastome data set also yielded the oldest (mid-Permian) age estimate when analyzed with the autocorrelated TK02 clock model. Adding the highly divergent, recently established sister species Isoetes wormaldii to the data set approximately doubled the average median node depth to the Isoetes crown group. Conclusions: There is no consistent support for a Cenozoic origin of the living clade Isoetes. We obtained seemingly well-founded, yet strongly deviating results depending on data type and clock model. The single most important future improvement is probably to add calibration points, which requires an improved understanding of the isoetalean fossil record or alternative bases for calibration.

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Biogeography of North Pacific Isoëtes (Isoëtaceae) inferred from nuclear and chloroplast DNA sequence data

Cited by 10 publications

References 43 publications

Phylogenomics supports a Cenozoic rediversification of the “living fossil” Isoetes

Phylogenomics supports a Cenozoic rediversification of the “living fossil” Isoetes

Molecular phylogeny and the biogeographic origin of East Asian Isoёtes (Isoёtaceae)

No phylogenomic support for a Cenozoic origin of the “living fossil” Isoetes

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