| 1. |
- Gâteblé, Gildas, et al.
(författare)
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One endemic plant species on average per month in New Caledonia, including eight more new species from Île Art (Belep Islands), a major micro-hotspot in need of protection
- 2018
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Ingår i: Australian Systematic Botany. - 1030-1887 .- 1446-5701. ; 31, s. 448-480
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Tidskriftsartikel (refereegranskat)abstract
- The New Caledonian biodiversity hotspot contains many micro-hotspots that exhibit high plant micro- endemism, and that are facing different types and intensities of threats. The Belep archipelago, and especially Île Art, with 24 and 21 respective narrowly endemic species (1 Extinct, 21 Critically Endangered and 2 Endangered), should be considered as the most sensitive micro-hotspot of plant diversity in New Caledonia because of the high anthropogenic threat of fire. Nano-hotspots could also be defined for the low forest remnants of the southern and northern plateaus of Île Art. With an average rate of more than one new species described for New Caledonia each month since January 2000 and five new endemics for the Belep archipelago since 2009, the state of knowledge of the flora is steadily improving. The present account of eight new species from Île Art (Bocquillonia montrouzieri Gâteblé & McPherson, Cleidion artense Gâteblé & McPherson, Endiandra artensis Munzinger & McPherson, Eugenia belepiana J.W.Dawson ex N.Snow, Eugenia insulartensis J.W.Dawson ex N.Snow, Macaranga latebrosa Gâteblé & McPherson, Planchonella serpentinicola Swenson & Munzinger and Psychotria neodouarrei Barrabé & A.Martini) further demonstrates the need both to recognise the Belep Islands as a major New Caledonian micro-hotspot and to formulate concrete conservation programs for the archipelago.
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| 2. |
- Gâteblé, Gildas, et al.
(författare)
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Pichonia munzingeri (Sapotaceae), a new and rare micro-endemic species from New Caledonia
- 2019
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Ingår i: Candollea. - : Society of Conservatoire at Jardin Botaniques de la Ville de Geneve. - 0373-2967 .- 2235-3658. ; 74, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- Pichonia munzingeri Gâteblé & Swenson (Sapotaceae, Chrysophylloideae) is here described from the southern ultrama c massif of Grande Terre, New Caledonia. It is a micro-endemic species con ned to a small area along Oumbéa Creek in La Coulée Valley of Mont-Dore. Based on nuclear ribosomal sequence data, areolate higher leaf venation, staminodes, stamens in corolla tube ori ce, and seeds having plano-convex cotyledons, no endosperm, and no radicle, this new species is placed in Pichonia Pierre. Preliminary phylogenetic analysis places Pichonia munzingeri as the sister species to all other congeners in New Caledonia, which justi es a high conservation status from the authorities for protecting the species. Less than 50 individuals have been counted in an area a ected by the major “Montagne des Sources” anthropogenic re in late 2005. Hence, repeated res form the main threat to the existence of this new species, and it is assigned an IUCN Red List preliminary status as “Critically Endangered”.
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| 3. |
- Leebens-Mack, James H., et al.
(författare)
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One thousand plant transcriptomes and the phylogenomics of green plants
- 2019
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Ingår i: Nature. - : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 574:7780, s. 679-
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Tidskriftsartikel (refereegranskat)abstract
- Green plants (Viridiplantae) include around 450,000-500,000 species(1,2) of great diversity and have important roles in terrestrial and aquatic ecosystems. Here, as part of the One Thousand Plant Transcriptomes Initiative, we sequenced the vegetative transcriptomes of 1,124 species that span the diversity of plants in a broad sense (Archaeplastida), including green plants (Viridiplantae), glaucophytes (Glaucophyta) and red algae (Rhodophyta). Our analysis provides a robust phylogenomic framework for examining the evolution of green plants. Most inferred species relationships are well supported across multiple species tree and supermatrix analyses, but discordance among plastid and nuclear gene trees at a few important nodes highlights the complexity of plant genome evolution, including polyploidy, periods of rapid speciation, and extinction. Incomplete sorting of ancestral variation, polyploidization and massive expansions of gene families punctuate the evolutionary history of green plants. Notably, we find that large expansions of gene families preceded the origins of green plants, land plants and vascular plants, whereas whole-genome duplications are inferred to have occurred repeatedly throughout the evolution of flowering plants and ferns. The increasing availability of high-quality plant genome sequences and advances in functional genomics are enabling research on genome evolution across the green tree of life.
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| 4. |
- Swenson, Ulf, 1959-, et al.
(författare)
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The largest endemic genus in New Caledonia grows: Three new species of Pycnandra (Sapotaceae) restricted to ultramafic substrate with updated subgeneric keys
- 2021
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Ingår i: Australian Systematic Botany. - 1030-1887 .- 1446-5701. ; 34, s. 510-525
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Tidskriftsartikel (refereegranskat)abstract
- Pycnandra Benth., a member of subfamily Chrysophylloideae (Sapotaceae), is the largest endemic genus in New Caledonia and is subdivided into six subgenera. It circumscribes 59 species, plus an additional three described here, and nine additional species that remain undescribed for various reasons. We here use nrDNA data of ETS, ITS, and RPB2, analyse it within a Bayesian framework using BEAST, and place the new species in their respective subgenera. Pycnandra perplexaSwenson & Gâteblé is placed in subgenus Achradotypus and given a preliminary IUCN Red List assessment of Near Threatened (NT). It is confined to the ultramafic massif of southern Grande Terre and separated from the similar species P. griseosepala Vink, which is confined to non-ultramafic mountains north of the large southern ultramafic plateau. Pycnandra kopetoensis Munzinger & Swenson and P. margueriteae Munzinger & Swenson are two new micro-endemic species known only from their type localities, where habitats have been destroyed by deforestation, deliberate fires and mining activities. Pycnandra kopetoensis is named after Mount Kopéto, placed in subgenus Leptostylis, and given a preliminary assessment as Critically Endangered (CR). Pycnandra margueriteae is from a small remnant forest near Bourail and categorised as Critically Endangered (CR). Revised identification keys for subgenus Achradotypus, Leptostylis and Pycnandra are provided.
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