Document Type

Dissertation

Degree

Doctor of Philosophy (PhD)

Major/Program

Biology

First Advisor's Name

Javier Francisco-Ortega

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Heather Bracken-Grissom

Second Advisor's Committee Title

Committee Member

Third Advisor's Name

Grenville Draper

Third Advisor's Committee Title

Committee Member

Fourth Advisor's Name

Brett Jestrow

Fourth Advisor's Committee Title

Committee Member

Fifth Advisor's Name

Jennifer Richards

Fifth Advisor's Committee Title

Committee Member

Keywords

Caribbean Island Biodiversity Hotspot, Eugenia, molecular phylogenetics, Myrteae, taxonomy

Date of Defense

10-21-2020

Abstract

The Myrtaceae, or myrtle family, are a group of flowering trees and shrubs represented in the Americas by over 2000 species of the predominantly Neotropical tribe Myrteae. Recent progress on the challenging systematics of the group has been achieved through molecular phylogenetics, but few of the almost 500 species endemic to the islands of the Greater and Lesser Antilles in the Caribbean have been included in either phylogenetic or revisionary studies. The purpose of my dissertation is therefore to contribute to the description and phylogenetic classification of Antillean Myrtaceae. The first study describes Eugenia walkerae, a new species of conservation concern endemic to the island of Anguilla in the Lesser Antilles. The second study surveys the diversity of Myrtaceae present in the Greater Antilles. Members of all genera native to the region were sampled through field work across the region and included in a phylogeny inferred from one nuclear and three chloroplast genetic regions with known representatives of major clades. On the basis of the results, three Greater Antillean endemic genera (Calyptrogenia, Hottea, and Mitranthes) are reduced to synonyms, Pseudanamomis and Calycolpus sensu Bisse are found to be polyphyletic, and the Greater Antillean species of Plinia are included within Myrciaria. The presence of two new lineages in the region within subtribe Myrtinae and Eugenia is also identified. The third study revises the taxonomy of the Lathberry Clade, a novel group of seven species of Eugenia distributed from Puerto Rico through the Lesser Antilles. The morphology and seed coat structure of each species of this clade were examined from herbarium material, and a phylogeny was inferred from three non-coding nuclear genetic regions. The results of these investigations are summarized in a taxonomic treatment including extinction risk assessments. My dissertation shows that the outstanding diversity of Myrtaceae in the Greater and Lesser Antilles consists mostly of species of major lineages also found on adjacent continents. It also lays a foundation for further descriptive and phylogenetic work needed to advance the systematics of Myrtaceae in the region.

Identifier

FIDC009193

Previously Published In

Flickinger, J. A. 2018. A new species of Eugenia (Myrtaceae) from the island of Anguilla. Harvard Papers in Botany 23: 213–216.

Flickinger, J. A., B. Jestrow, R. Oviedo Prieto, E. Santiago-Valentín, J. Sustache-Sustache, F. Jiménez-Rodríguez, K. C. St. E. Campbell, and J. Francisco-Ortega. 2020. A phylogenetic survey of Myrtaceae in the Greater Antilles with nomenclatural changes for some endemic species. Taxon 69: 448–480.

Supplementary File 2.1.nex (665 kB)
DNA sequence alignment

Supplementary File 2.2.nex (15 kB)
matrix of coded gaps

Supplementary File 3.1.nex (81 kB)
DNA sequence alignments

Supplementary File 3.2.xml (76 kB)
BEAST XML file

Available for download on Thursday, September 30, 2021

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