Reduction of the Hawaiian genus Platydesma into Melicope section Pelea (Rutaceae) and notes on the monophyly of the section

Appelhans, Marc S.; Wood, Kenneth R.; Wagner, Warren L.

doi:10.3897/phytokeys.91.21363

Cited by 8 publications

(25 citation statements)

References 17 publications

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“…Two samples represent the two independent colonization events to the Marquesas Islands (28% of Marquesan species). Taxonomic treatment follows species recognized in Wood et al (2016) plus a recently described species (Wood et al, 2017) and including Platydesma (Appelhans et al, 2017). Additionally, morphologically divergent specimens of Melicope barbigera (KW16722 and KW16718) and Melicope ovata (KW16762, KW17082, and MA663) were included ( Table 1 , asterisk) to elucidate whether these might represent separate taxa.…”

Section: Methodsmentioning

confidence: 99%

“…The genus Melicope comprises about 235 species of shrubs and trees distributed throughout SE Asia and Australasia, extending to the Mascarene Islands and Madagascar in the West and most of the Pacific Archipelagos in the East (Hartley, 2001). There are 54 species of Melicope endemic to the Hawaiian Islands (Appelhans et al, 2017; Wood et al, 2017), 41 of which are single island endemics (Stone et al, 1999). Hawaiian Melicope were initially placed in the genus Pelea together with species from the Marquesas Islands (Stone, 1969; Stone et al, 1999) but later incorporated into Melicope , forming the majority of the section Pelea (Hartley, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The origin of the lineage was dated to the Mid or Late Miocene (Appelhans et al, 2018a), predating the age of Kauaʻi and Niʻihau (Price and Clague, 2002). In addition, the Hawaiian endemic genus Platydesma is nested within Melicope as a monophyletic sister group to the Hawaiian species and has since been reduced (Appelhans et al, 2017). Statistically supported incongruences between individual genomic regions were not observed, yet the resolution of relationships within and among the clades was in general medium to poor (Harbaugh et al, 2009; Appelhans et al, 2014a; Appelhans et al, 2014b; Appelhans et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

“…Statistically supported incongruences between individual genomic regions were not observed, yet the resolution of relationships within and among the clades was in general medium to poor (Harbaugh et al, 2009; Appelhans et al, 2014a; Appelhans et al, 2014b; Appelhans et al, 2018a). However, two independent Hawaiian origins of the Marquesan Melicope radiation, which encompasses seven species, were inferred (Appelhans et al, 2014a; Appelhans et al, 2014b; Appelhans et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Phylogeny of Hawaiian Melicope (Rutaceae): RAD-seq Resolves Species Relationships and Reveals Ancient Introgression

et al. 2019

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Hawaiian Melicope are one of the major adaptive radiations of the Hawaiian Islands comprising 54 endemic species. The lineage is monophyletic with an estimated crown age predating the rise of the current high islands. Phylogenetic inference based on Sanger sequencing has not been sufficient to resolve species or deeper level relationships. Here, we apply restriction site-associated DNA sequencing (RAD-seq) to the lineage to infer phylogenetic relationships. We employ Quartet Sampling to assess information content and statistical support, and to quantify discordance as well as partitioned ABBA-BABA tests to uncover evidence of introgression. Our new results drastically improved resolution of relationships within Hawaiian Melicope. The lineage is divided into five fully supported main clades, two of which correspond to morphologically circumscribed infrageneric groups. We provide evidence for both ancestral and current hybridization events. We confirm the necessity for a taxonomic revision of the Melicope section Pelea, as well as a re-evaluation of several species complexes by combining genomic and morphological data.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phylogeny of Hawaiian Melicope (Rutaceae): RAD-seq Resolves Species Relationships and Reveals Ancient Introgression

et al. 2019

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“…(Australia to Fiji) are nested within Melicope while Maclurodendron T.G.Hartley (Malay Peninsula to the Philippines and Hainan) is nested within Acronychia . Platydesma has recently been merged into Melicope (Appelhans et al, ). Medicosma Hook.f (New Guinea, E Australia, New Caledonia) and Tetractomia Hook.f (Malay Peninsula to the Solomon Islands) are consecutive sister groups of the Acronychia‐Melicope clade.…”

Section: Introductionmentioning

confidence: 99%

Historical biogeography of Melicope (Rutaceae) and its close relatives with a special emphasis on Pacific dispersals

Appelhans¹,

Wen

Duretto

et al. 2018

J of Sytematics Evolution

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The genus Melicope (Rutaceae) occurs on most Pacific archipelagos and is perfectly suited to study Pacific biogeography. The main goal was to infer the age, geographic origin and colonization patterns of Melicope and its relatives. We sequenced three nuclear and two plastid markers for 332 specimens that represent 164 species in 16 genera of Rutaceae. Phylogenetic reconstruction, molecular dating, ancestral area reconstruction and diversification analyses were carried out. The two main clades (Acronychia‐Melicope and Euodia) originated in Australasia and their crown ages are dated to the Miocene. Diversification rates differed among the subclades and were lowest in the Euodia lineage and highest in the Hawaiian Melicope lineage. The Malagasy and Mascarene species form a clade, which split from its SE Asian relatives in the Pliocene/Pleistocene. At least eight colonizations to the Pacific islands occurred. The timing of all colonizations except for the Hawaiian group is congruent with age of the island ages. Australia, New Guinea and New Caledonia have been the source of colonizations into the Pacific islands in the Melicope clade. Melicope shows high dispersability and has colonized remote archipelagos such as the Austral and Marquesas Islands each twice. Colonization of islands of the Hawaiian‐Emperor seamount chain likely predates the ages of the current main islands, and the initial colonization to Kaua'i occurred after the splitting of the Hawaiian lineage into two subclades. Wider ecological niches and adaptations to bird‐dispersal likely account for the much higher species richness in the Acronychia‐Melicope clade compared to the Euodia clade.

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Boronia (Rutaceae) is polyphyletic: Reinstating Cyanothamnus and the problems associated with inappropriately defined outgroups

Duretto

Heslewood

Bayly

2020

TAXON

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The monophyly of Boronia (Rutaceae) was tested using 134 accessions of 120 species belonging to 39 genera from subfamily Amyridoideae. Taxa included representatives of all eight sections of Boronia plus species of most genera in the two main clades related to Boronia that had been identified by earlier studies. These samples included a good representation of genera from both rainforest and sclerophyllous biomes. Maximum parsimony and Bayesian inference analyses were performed using three plastid markers (psbA‐trnH, trnL‐trnF, rbcL) and two nuclear ribosomal markers (ITS, ETS). Separate analyses of plastid and nuclear sequences using either maximum parsimony or Bayesian inference analyses recovered similar topologies. Apart from Boronia, the broad generic relationships of previous analyses were largely supported. Boronia is polyphyletic with section Cyanothamnus being more closely related to a large clade containing genera found in rainforest, including Melicope, Acronychia and their relatives. The remaining seven sections of Boronia formed a strongly supported and isolated group. Boronia sensu stricto is sister to a clade containing the Cyanothamnus‐Melicope‐Acronychia clade plus a clade containing Euodia, Zieria and other small genera found in rainforest or sclerophyllous communities. Issues with circumscriptions of ingroups and outgroups for previous analyses of Boronia and the complex relationship between Australasian genera found in rainforest and sclerophyllous communities are both discussed. Cyanothamnus is reinstated at generic level. Appropriate nomenclatural changes are made to transfer all currently recognised series, species, subspecies and varieties of Boronia sect. Cyanothamnus to the genus Cyanothamnus.

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Reduction of the Hawaiian genus Platydesma into Melicope section Pelea (Rutaceae) and notes on the monophyly of the section

Cited by 8 publications

References 17 publications

Phylogeny of Hawaiian Melicope (Rutaceae): RAD-seq Resolves Species Relationships and Reveals Ancient Introgression

Phylogeny of Hawaiian Melicope (Rutaceae): RAD-seq Resolves Species Relationships and Reveals Ancient Introgression

Historical biogeography of Melicope (Rutaceae) and its close relatives with a special emphasis on Pacific dispersals

Boronia (Rutaceae) is polyphyletic: Reinstating Cyanothamnus and the problems associated with inappropriately defined outgroups

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