Phylogeographic Patterns in Two Southern Hemisphere Species of <i>Calyptrochaeta</i> (Daltoniaceae, Bryophyta)

Pokorny, Lisa; Oliván, Gisela; Shaw, A. Jonathan

doi:10.1600/036364411x583529

Cited by 29 publications

(22 citation statements)

References 76 publications

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“…These migrations likely occurred through the SW Asian‐Arabian platform corridor, a major migratory pathway of temperate Holarctic plants into the African continent, with lineages probably moving along the volcanic ridge of East Tropical Africa and S. Africa (Gehrke & Linder, ). The colonization of Madagascar by the African Pseudobromus in the Late Pliocene concurs with other plant colonizations from mainland Africa in the Late Miocene (Pokorny et al ., ), despite the apparent reversal of favourable wind‐currents after the Palaeogene. In contrast, colonizations of Madagascar from mainland Asia have been frequent for several plant and animal lineages at different Cenozoic times (e.g.…”

Section: Discussionmentioning

confidence: 99%

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Minaya

Hackel

Namaganda

et al. 2017

Journal of Biogeography

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Aim Successful colonization after long‐distance dispersal (LDD) depends on the availability of suitable habitats and competitive ability. In this study, we address the hypothesis that two widely distributed sister grass lineages (broad‐ and fine‐leaved Loliinae; hereafter BL and FL) that differ in their habitat requirements and competitive ability also differ in their biogeographic history, with particular reference to LDD. Location Global. Methods We reconstructed a comprehensive phylogeny of Loliinae, based on nuclear and plastid markers and estimated divergence times using fossil calibrations. Biogeographical events were estimated using analysis of range evolution, comparing different models. Numbers and rates of dispersals were estimated for BL and FL using stochastic mapping with best‐performing and baseline biogeographical models, and examined for correlation with distance, disjunction type, and phenotypic syndrome. Results The most recent common ancestor of Loliinae likely split at the Oligocene‐Miocene transition (22.50 ± 3.95 Ma), pre‐dating previous estimates, whereas the ancestors of the BL and FL Loliinae likely began to diversify in the Early Miocene (18.91 ± 4.15 and 17.50 ± 3.50 Ma, respectively). A model of range evolution integrating founder events and scaling of dispersal by shortest distance between areas performed best amongst a set of alternative models and recovered a mean of 83 dispersal events in Loliinae. Overall dispersal rates were significantly higher in BL than in FL. Per‐route dispersal rates showed a significant negative exponential relationship to shortest distance but were not affected by phenotypic syndrome or disjunction type. Main conclusions Loliinae originated in the Northern Hemisphere and evolved through recurrent LDDs. Higher competitive ability, potentially related to the broad‐leaved syndrome (i.e. tall strong‐rhizomatous plants, long‐living individuals, occupancy of more stable habitats), may explain higher observed dispersal rates in BL compared with FL Loliinae. However, the dominant factor impacting dispersal in both BL and FL Loliinae is the distance between suitable areas.

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Section: Discussionmentioning

confidence: 99%

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Minaya

Hackel

Namaganda

et al. 2017

Journal of Biogeography

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“…The approach followed here, based on Pokorny et al . (), is slightly different as we do not have infraspecific sampling for all taxa in the phylogeny (e.g. the outgroup taxa are represented by one sequence each).…”

Section: Discussionmentioning

confidence: 99%

“…To solve this problem, we used here a nested‐dating partitioned approach – first proposed by Pokorny et al . () – in which a higher‐level data set calibrated with external evidence (the Platycodoneae data set) is used to constrain the molecular clock rate of additional linked data sets containing population‐level data. For this, we constructed two data sets containing all accessions of ITS and plastid markers ( pet BD, psb J, trn LF and trn SG) for every sampled population within Canarina eminii ( n = 7) and C. canariensis ( n = 21).…”

Section: Methodsmentioning

confidence: 99%

Ancient vicariance and climate‐driven extinction explain continental‐wide disjunctions in Africa: the case of the Rand Flora genus Canarina (Campanulaceae)

et al. 2015

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Transoceanic distributions have attracted the interest of scientists for centuries. Less attention has been paid to the evolutionary origins of 'continent-wide' disjunctions, in which related taxa are distributed across isolated regions within the same continent. A prime example is the 'Rand Flora' pattern, which shows sister taxa disjunctly distributed in the continental margins of Africa. Here, we explore the evolutionary origins of this pattern using the genus Canarina, with three species: C. canariensis, associated with the Canarian laurisilva, and C. eminii and C. abyssinica, endemic to the Afromontane region in East Africa, as case study. We infer phylogenetic relationships, divergence times and the history of migration events within Canarina using Bayesian inference on a large sample of chloroplast and nuclear sequences. Ecological niche modelling was employed to infer the climatic niche of Canarina through time. Dating was performed with a novel nested approach to solve the problem of using deep time calibration points within a molecular dataset comprising both above-species and population-level sampling. Results show C. abyssinica as sister to a clade formed by disjunct C. eminii and C. canariensis. Miocene divergences were inferred among species, whereas infraspecific divergences fell within the Pleistocene-Holocene periods. Although C. eminii and C. canariensis showed a strong genetic geographic structure, among-population divergences were older in the former than in the latter. Our results suggest that Canarina originated in East Africa and later migrated across North Africa, with vicariance and aridification-driven extinction explaining the 7000 km/7 million year divergence between the Canarian and East African endemics.

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“…Divergence time estimations of the Brachypodium lineages were calculated within a family‐wide dated phylogeny using a Bayesian nested dating partitioned approach (Pokorny et al ., ; Mairal et al ., ) in B east v.1.8.2 (Drummond et al ., ). Because there are no known fossil records of Brachypodium , a high‐level more inclusive grass data set (93 samples = 90 grass species + 1 B. distachyon + 1 B. stacei + 1 B. hybridum accession, 110 370 bp in length, 22 489 polymorphic positions) was used to estimate divergence times within the B. distachyon ingroup (53 samples, 110 370 bp in length, 415 polymorphic positions).…”

Section: Methodsmentioning

confidence: 97%

Comparative plastome genomics and phylogenomics of Brachypodium: flowering time signatures, introgression and recombination in recently diverged ecotypes

et al. 2017

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Few pan-genomic studies have been conducted in plants, and none of them have focused on the intraspecific diversity and evolution of their plastid genomes. We address this issue in Brachypodium distachyon and its close relatives B. stacei and B. hybridum, for which a large genomic data set has been compiled. We analyze inter- and intraspecific plastid comparative genomics and phylogenomic relationships within a family-wide framework. Major indel differences were detected between Brachypodium plastomes. Within B. distachyon, we detected two main lineages, a mostly Extremely Delayed Flowering (EDF+) clade and a mostly Spanish (S+) - Turkish (T+) clade, plus nine chloroplast capture and two plastid DNA (ptDNA) introgression and micro-recombination events. Early Oligocene (30.9 million yr ago (Ma)) and Late Miocene (10.1 Ma) divergence times were inferred for the respective stem and crown nodes of Brachypodium and a very recent Mid-Pleistocene (0.9 Ma) time for the B. distachyon split. Flowering time variation is a main factor driving rapid intraspecific divergence in B. distachyon, although it is counterbalanced by repeated introgression between previously isolated lineages. Swapping of plastomes between the three different genomic groups, EDF+, T+, S+, probably resulted from random backcrossing followed by stabilization through selection pressure.

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Phylogeographic Patterns in Two Southern Hemisphere Species of Calyptrochaeta (Daltoniaceae, Bryophyta)

Cited by 29 publications

References 76 publications

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Ancient vicariance and climate‐driven extinction explain continental‐wide disjunctions in Africa: the case of the Rand Flora genus Canarina (Campanulaceae)

Comparative plastome genomics and phylogenomics of Brachypodium: flowering time signatures, introgression and recombination in recently diverged ecotypes

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