Hotspots of narrow endemisms: adequate focal points for conservation in Dendrochilum (Orchidaceae)

Pedersen, Henrik Æ.

doi:10.15517/lank.v7i1-2.18444

Cited by 3 publications

(12 citation statements)

References 20 publications

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“…Dendrochilum (comprising remarkably little morphological variation) may indeed deserve recognition as a distinct subgenus. It comprises 15 species distributed from Myanmar and Thailand across the Malay Peninsula to Sumatra, Java, Bali, Borneo and the Philippines (Pedersen, 1995a(Pedersen, , 2007aPedersen & al., 1997;Wood, 2001). In the strongly supported clade that is sister to subg.…”

Section: ■ Resultsmentioning

confidence: 99%

“…Thus, highly differing views on the systematic relevance of paraphyletic taxa exist (e.g., Sosef, 1997;Chase, 1999;Potter & Freudenstein, 2005; Hörandl & Stuessy, 2010)and we on our part do not support recognition of paraphyletic taxa. (Pedersen, 2007b) each ingroup species is known to occur. For species not being endemic to a hotspot, hotspot abbreviations (if any) are given in parentheses.…”

Section: ■ Resultsmentioning

confidence: 99%

“…Distributions. -Adopting the hotspots of narrow endemism identified by Pedersen (2007b), we scored from which hotspots (if any) our individual study species were recorded, and whether they were known to occur outside the hotspots. The distribution survey was based on the following sources: J.J. Smith (1933a), De Vogel (1986), Pedersen (1995aPedersen ( , 1997aPedersen ( , 2011, Pedersen & al.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Of these, 40 species (98%) are endemic to one of the hotspots of narrow endemism designated by Pedersen (2007b), see Fig. 2, whereas D. diabloviride is endemic to the central Philippine island of Samar.…”

Section: Version Of Recordmentioning

confidence: 99%

“…2, whereas D. diabloviride is endemic to the central Philippine island of Samar. In comparison, Pedersen (2007b) estimated that Dendrochilum contains 71% narrow endemics and that 90% of them occur in one of the hotspots. Thus, in this respect, the current sampling appears to be fairly representative.…”

Section: Version Of Recordmentioning

confidence: 99%

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Phylogenetics of Dendrochilum (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

Pedersen

Petersen

Gravendeel

et al. 2019

TAXON

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A phylogenetic hypothesis for the genus Dendrochilum s.l. (including Bracisepalum) is based on nucleotide sequences of the nuclear ribosomal ITS and two plastid regions (matK, ycf1). The trees based on parsimony analysis of the nrITS and plastid partitions, respectively, are largely congruent, the only strongly supported conflict being the exact position of D. arachnites. Maximum likelihood analysis of the combined molecular matrix resulted in a tree with very high topological congruence to the parsimony consensus tree and to a fossil‐calibrated Bayesian inference tree that was used for dating. Our results confirm that monophyly of Dendrochilum is only supported if Bracisepalum is included in the former. They also suggest that only two subgenera (Dendrochilum, Platyclinis) should be recognized, whereas all other subgenera and sections previously proposed on a morphological basis should be treated as synonyms of subg. Platyclinis. Indeed, mapping of five vegetative and nine floral characters of alleged systematic value, using DELTRAN and ACCTRAN optimization, demonstrates pronounced morphological homoplasy. Molecular time calibration dates the origin of the genus to the Miocene and contradicts the hypothesis that most extant Dendrochilum species did not evolve until the Holocene. Inferred phylogenetic relationships between extant species, in combination with previously identified hotspots of narrow endemism, suggest that species endemism in Dendrochilum is predominantly centric.

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Section: ■ Resultsmentioning

confidence: 99%

Section: ■ Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Version Of Recordmentioning

confidence: 99%

Section: Version Of Recordmentioning

confidence: 99%

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Phylogenetics of Dendrochilum (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

Pedersen

Petersen

Gravendeel

et al. 2019

TAXON

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First wild record of Dendrochilum warrenii (Orchidaceae: Epidendroideae) confirms a Philippine provenance

Naive

Gravendeel²

2018

Lankesteriana

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Recent explorations on one of the mountains of the Bukidnon province on the island of Mindanao in the Philippines resulted in a wild collection of Dendrochilum warrenii, an Orchidaceae species described in 2004 from a cultivated plant of unknown provenance. In this publication, an extended species description along with color photographs are provided to aid future identification. Information on the distribution, ecology and phenology of the species in the wild is also provided.

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Dendrochilum hampelii (Coelogyninae, Epidendroideae, Orchidaceae) traded as ‘Big Pink’ is a new species, not a hybrid: evidence from nrITS, matK and ycf1 sequence data

Sulistyo

Boos

Cootes

et al. 2015

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In 2013, an unidentified species of Dendrochilum appeared in cultivation under the commercial trade name ‘Big Pink’. Using sequences of the nuclear ribosomal ITS1-5.8S-ITS2 region and of the plastid matK and ycf1 genes, we examined the phylogenetic relationships between ‘Big Pink’ and six other species of the phenetically defined Dendrochilum subgen. Platyclinis sect. Eurybrachium. Separate and combined analyses (using Bayesian, Maximum Likelihood and Parsimony inference) showed consistent placement of the unidentified species within a statistically well supported clade. Furthermore, the multi-copy nrITS marker showed clear distinct peaks. Thus, we found no evidence that ‘Big Pink’ could be a hybrid. Against this background, and further supported by species-specific mutations in (at least) nrITS and ycf1, we formally describe ‘Big Pink’ as a new species under the name Dendrochilum hampelii. Morphologically, it is most similar to Dendrochilum propinquum, but it differs in a number of characters. Of the two cultivated individuals available for our study, one was of unrecorded provenance. The other allegedly originated from the Philippines. Observations of the species occurring in the wild in the Philippines in the northern provinces of Bukidnon and Misamis Oriental on the island of Mindanao confirmed this.

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Hotspots of narrow endemisms: adequate focal points for conservation in Dendrochilum (Orchidaceae)

Cited by 3 publications

References 20 publications

Phylogenetics of Dendrochilum (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

Phylogenetics of Dendrochilum (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

First wild record of Dendrochilum warrenii (Orchidaceae: Epidendroideae) confirms a Philippine provenance

Dendrochilum hampelii (Coelogyninae, Epidendroideae, Orchidaceae) traded as ‘Big Pink’ is a new species, not a hybrid: evidence from nrITS, matK and ycf1 sequence data

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