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2006

Plant Sciences

Carroll College

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Biogeographical Origins And Phytogeny Of The Endemic Hawaiian Species Ofcibotium (Dicksoniaceae): A Molecular Perspective Based On Atpb Sequences, Christine Nelson Apr 2006

Biogeographical Origins And Phytogeny Of The Endemic Hawaiian Species Ofcibotium (Dicksoniaceae): A Molecular Perspective Based On Atpb Sequences, Christine Nelson

Life and Environmental Sciences Undergraduate Theses

A great deal of speculation exists as to the biogeographical origins and phylogeny of endemic Hawaiian ferns; yet only a handful of studies has actually examined the evolution of these endemics and their relationships to continental species. The fern genus Cibotium (Dicksoniaceae), consisting of four Hawaiian endemics and five non-Hawaiian species, is the focus of this study. The goals of my research were to resolve whether Hawaiian Cibotium is monophyletic and to test the hypothesis that the common ancestor of Hawaiian Cibotium originated from the IndoPacific region. Although the long-distance dispersal mechanism of fern spores to Hawaii was not directly ...


Molecular Phylogenetics And Biogeography Of Hawaiian Members Of The Pteridophyte Genus Cibotium (Dicksoniaceae), Annabelle Kleist Apr 2006

Molecular Phylogenetics And Biogeography Of Hawaiian Members Of The Pteridophyte Genus Cibotium (Dicksoniaceae), Annabelle Kleist

Life and Environmental Sciences Undergraduate Theses

Although ferns comprise a significant proportion of Hawaii’s native vascular-plant flora, few phylogenetic studies have been performed to infer relationships among taxa and to deduce their biogeographical origins. Species from the pteridophyte genus Cibotium can be found among the canopy in the Island’s montane regions and were the focus of this study. Four species of Cibotium are endemic to the Hawaiian Archipelago and ten species exist worldwide. The goal of this study was to determine whether Hawaiian Cibotium is monophyletic and to discover the biogeographical origins ofthe species. Two chloroplast DNA fragments, trnL-F IGS and rbcL, were sequenced ...


Biogeographical Origins Of Hawaiian Diplopterygium Pinnatum By Long Distance Wind Dispersal, Kris Christensen Apr 2006

Biogeographical Origins Of Hawaiian Diplopterygium Pinnatum By Long Distance Wind Dispersal, Kris Christensen

Life and Environmental Sciences Undergraduate Theses

This study was designed to investigate a possible biogeographical origin and mechanism of dispersal ofthe Hawaiian fern Diplopterygium pinnatum. Molecular phylogenetic analyses were conducted on trnL-F and rbcL, cpDNA regions, for seven species of the genus Diplopterygium and three outgroups. Maximum parsimony and maximum likelihood analyses were used for phylogenetic reconstruction. Three hypotheses were tested: that the ancestor ofD. pinnatum originated from 1) an IndoPacific source and traveled to Hawaii via the jet stream, 2) an American source and traveled to Hawaii via the trade winds, or 3) an Austral source and traveled to Hawaii by a combination of an ...