Analyses of amplified fragment length polymorphisms (AFLP) indicate rapid radiation of Diospyros species (Ebenaceae) endemic to New Caledonia

Turner, Barbara; Paun, Ovidiu; Munzinger, Jérôme; Duangjai, Sutee; Chase, Mark W.; Samuel, Rosabelle

doi:10.1186/1471-2148-13-269

Cited by 20 publications

(24 citation statements)

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“…The present study, using ITS sequences and an extended list of species, suggests monophyly of the Lasiocephalus ‐ Culcitium species group but with neither of the two former genera monophyletic. Although relationships within the group are only partly resolved in both the ITS and AFLP datasets, suggesting a recent diversification (Turner et al., ), there is a partial congruence between the two markers, as AFLP cluster C corresponds to the ITS “páramo clade” (except for Senecio nivalis ) and AFLP clusters A and B correspond to the ITS “forest clade” (except for S. puracensis ) (Figure , Table ); incongruences will be discussed below.…”

Section: Discussionmentioning

confidence: 99%

“…Although relationships within the group are only partly resolved in both the ITS and AFLP datasets, suggesting a recent diversification (Turner et al, 2013), there is a partial congruence between the two markers, as AFLP cluster C corresponds to the ITS "páramo clade" (except for Senecio nivalis) and AFLP clusters A and B correspond to the ITS "forest clade" (except for S. puracensis) ( Figure 6, Table 1); incongruences will be discussed below.…”

Section: Lasiocephalus-culcitium Species Groupmentioning

confidence: 99%

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Growth form evolution and hybridization in Senecio (Asteraceae) from the high equatorial Andes

Dušková

Sklenář

Kolář

et al. 2017

Ecology and Evolution

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Changes in growth forms frequently accompany plant adaptive radiations, including páramo–a high‐elevation treeless habitat type of the northern Andes. We tested whether diverse group of Senecio inhabiting montane forests and páramo represented such growth form changes. We also investigated the role of Andean geography and environment in structuring genetic variation of this group. We sampled 108 populations and 28 species of Senecio (focusing on species from former genera Lasiocephalus and Culcitium) and analyzed their genetic relationships and patterns of intraspecific variation using DNA fingerprinting (AFLPs) and nuclear DNA sequences (ITS). We partitioned genetic variation into environmental and geographical components. ITS‐based phylogeny supported monophyly of a Lasiocephalus‐Culcitium clade. A grade of herbaceous alpine Senecio species subtended the Lasiocephalus‐Culcitium clade suggesting a change from the herbaceous to the woody growth form. Both ITS sequences and the AFLPs separated a group composed of the majority of páramo subshrubs from other group(s) comprising both forest and páramo species of various growth forms. These morphologically variable group(s) further split into clades encompassing both the páramo subshrubs and forest lianas, indicating independent switches among the growth forms and habitats. The finest AFLP genetic structure corresponded to morphologically delimited species except in two independent cases in which patterns of genetic variation instead reflected geography. Several morphologically variable species were genetically admixed, which suggests possible hybrid origins. Latitude and longitude accounted for 5%–8% of genetic variation in each of three AFLP groups, while the proportion of variation attributed to environment varied between 8% and 31% among them. A change from the herbaceous to the woody growth form is suggested for species of high‐elevation Andean Senecio. Independent switches between habitats and growth forms likely occurred within the group. Hybridization likely played an important role in species diversification.

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Section: Discussionmentioning

confidence: 99%

Section: Lasiocephalus-culcitium Species Groupmentioning

confidence: 99%

Growth form evolution and hybridization in Senecio (Asteraceae) from the high equatorial Andes

Dušková

Sklenář

Kolář

et al. 2017

Ecology and Evolution

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“…For H. deplanchei, H. subobtusum and H. leratii, other possible source areas are Southeast Asia, Australia and other Pacific Islands. Whereas LDD from Australia to NC has been shown in several groups (see references in Introduction), cases of LDD from Southeast Asia and NZ to NC are less common (but for Southeast Asia see studies on Piper L., Piperaceae; and Diospyros L., Ebenaceae;Turner & al., 2013). However, a key role of NZ in the origin of the NC flora was suggested by Pole (2010) based on the presence, in the NZ fossil record, of lineages that are now restricted to NC.…”

Section: Discussionmentioning

confidence: 99%

Origins of the fern genus Hymenophyllum (Hymenophyllaceae) in New Caledonia: Multiple independent colonizations from surrounding territories and limited in situ diversification

Rio

Hennequin

Rouhan

et al. 2017

TAXON

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Based on a worldwide dataset of molecular sequence data from three plastid DNA markers (rbcL, rbcL-accD-accD, rps4-trnS) obtained from 109 species of Hymenophyllum (Hymenophyllaceae), we investigated the systematics and biogeographic origins of the New Caledonian (NC) members of this fern genus, which were thought to include 16 species with 10 endemics. Located in the southwest Pacific, NC is a continental Gondwanan island that was long supposed to harbour phylogenetic relicts. However, molecular and geological data suggest that the current flora and fauna are the result of recent colonizations that occurred after total submersion (during the Eocene) and subsequent re-emersion of NC ca. 37 Ma. Our molecular phylogenetic results, complemented by morphological observations of herbarium specimens, show the existence of a new species that was as yet undescribed, and suggest that a previously recognized variety should be elevated to the rank of species to avoid species polyphyly. These two species, which are recognizable based on several morphological features, are endemic to NC: (i) Hymenophyllum soriemersum sp. nov. is sister to the other NC endemic H. dimidiatum; and (ii) H. neocaledonicum comb. & stat. nov, previously described as a variety within H. lyallii, was retrieved as a distinct lineage. We also confirmed the synonymy of H. streptophyllum and H. subdimidiatum (both previously considered as endemic to NC) with the more widely distributed H. javanicum and H. holochilum, respectively. These synonymies were previously hypothesised based on morphology alone. New Caledonia thus has as total of 17 Hymenophyllum species, 12 (71%) of which are endemics. Biogeographic inferences based on the results of our phylogenetic analyses suggest that Hymenophyllum originated in New Zealand ca. 49.8 Ma (95% HPD: 40.7-59.5 Ma). Its spatio-temporal history may in part have been influenced by vicariance (with potential exchange via the Antarctica land bridge that persisted between Australia and South America until 34 Ma), but long-distance dispersal (LDD) appears as the predominant process leading to the present-day distribution of species. At least eight LDD events are needed to explain the presence of the 10 NC endemics analysed here (H. francii and H. humboldtianum were not included), each of which occurred < 22.1 Ma and originated from a surrounding territory: Southeast Asia was probably the dispersal source for the NC endemic clade comprising H. soriemersum, H. dimidiatum, and H. rolandi-principis while the ancestors of the other NC endemics most likely dispersed from New Zealand, Australia or other Pacific Islands. Such a regional pattern is congruent with the distribution of non-endemic species, which are mostly shared among neighbouring territories. Lastly, we found evidence for only two cases of diversification within NC, yielding two and three species each (H. soriemersum, H. dimidiatum and H. rolandi-principis; and H. lyallii and the ancestor of H. braithwaitei and H. tomaniiviense). Such a low level of in situ di...

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“…Detecting the presence of cryptic species has implications for classification, conservation and biogeography. In New Caledonia, only two cases of cryptic flowering plant species have been revealed, in Spiraeanthemum A.Gray (Cunoniaceae; Pillon et al ., ) and Diospyros L. (Ebenaceae; Turner et al ., ). However, based on unpublished molecular data, Swenson & Munzinger () indicated that cryptic species might be present in Pycnandra .…”

Section: Introductionmentioning

confidence: 97%

Island life - classification, speciation and cryptic species ofPycnandra(Sapotaceae) in New Caledonia

et al. 2015

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Pycnandra (Sapotaceae), the largest endemic genus in New Caledonia, comprises 66 species classified in six subgenera. We tested phylogenetic relationships and a proposed infrageneric classification by sampling 60 species for sequences of nuclear ribosomal DNA (ETS, ITS, RPB2) and plastid DNA (trnH-psbA) and nine morphological characters. Data were analysed with Bayesian inference, parsimony jackknifing and lineage through time. We recovered a phylogenetic tree supporting the recognition of six proposed subgenera (Achradotypus, Leptostylis, Pycnandra, Sebertia, Trouettia and Wagapensia). Because a subgeneric classification is used, the nomenclature will be stable when the members are transferred to Pycnandra. Morphological traits were optimized in the BEAST analysis, adding evidence to earlier work that morphology has limited value for successfully diagnosing groups in Sapotaceae. We confirm a previously suspected case of cryptic species that exhibit the same morphological features and require the same abiotic conditions, but are distantly related in the phylogenetic tree. We detected two possible new cases of cryptic sibling species that might warrant recognition. A slowdown in speciation rate in several genera has been suggested as evidence that New Caledonia was once submerged after rifting from Australia. Plotting lineages through time reveals two important intervals at 7.5-8.6 Ma and present to 1.5 Ma, when net molecular diversification within the genus was zero. This indicates that the genus presently has reached a dynamic equilibrium, providing additional evidence that New Caledonia is an old Darwinian island, being submerged during the Eocene and colonized after re-emergence c. 37 Ma.

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Analyses of amplified fragment length polymorphisms (AFLP) indicate rapid radiation of Diospyros species (Ebenaceae) endemic to New Caledonia

Cited by 20 publications

References 51 publications

Growth form evolution and hybridization in Senecio (Asteraceae) from the high equatorial Andes

Growth form evolution and hybridization in Senecio (Asteraceae) from the high equatorial Andes

Origins of the fern genus Hymenophyllum (Hymenophyllaceae) in New Caledonia: Multiple independent colonizations from surrounding territories and limited in situ diversification

Island life - classification, speciation and cryptic species ofPycnandra(Sapotaceae) in New Caledonia

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