RESUMO
The taxonomic status of a single island, narrow range endemic plant species from Palau, Micronesia (Timonius salsedoi) was assessed using DNA barcode markers, additional plastid loci, and morphology in order to verify its conservation status. DNA barcode loci distinguished T. salsedoi from all other Timonius species sampled from Palau, and were supported by sequence data from the atpB-rbcL intergenic spacer region. Timonius salsedoi was only known from two mature individual trees in 2012. Due to its extremely narrow range and population size, it had previously been recommended to be listed as Critically Endangered Status under three separate IUCN Criteria. In 2014 a second survey of the population following a typhoon revealed that the only two known trees had died suggesting that this species may now be extinct. Comprehensive follow up surveys of suitable habitat for this species are urgently required.
Assuntos
Conservação dos Recursos Naturais/métodos , Código de Barras de DNA Taxonômico/métodos , Rubiaceae/genética , Árvores/genética , DNA de Plantas/química , DNA de Plantas/genética , Espécies em Perigo de Extinção , Extinção Biológica , Genomas de Plastídeos/genética , Geografia , Oceano Pacífico , Palau , Filogenia , Densidade Demográfica , Ribulose-Bifosfato Carboxilase/genética , Rubiaceae/anatomia & histologia , Rubiaceae/classificação , Análise de Sequência de DNA , Especificidade da Espécie , Árvores/anatomia & histologia , Árvores/classificaçãoRESUMO
Osmoxylon Miq. (Araliaceae) is revised for Palau, Micronesia including descriptions of two new taxa Osmoxylon leidichii Costion, sp. nov. and Osmoxylon ngardokense Costion, sp. nov. Full descriptions are provided for all four Palau species, along with diagnostic field keys.