Charles D Bell

Charles D Bell
University of New Orleans | UNO · Department of Biological Sciences

Ph.D. Yale University

About

147
Publications
34,797
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
8,948
Citations
Citations since 2016
18 Research Items
4329 Citations
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
Introduction
Additional affiliations
January 2007 - present
University of New Orleans
August 2006 - May 2007
Tulane University
August 2005 - July 2006
Florida State University
Position
  • Research Assistant

Publications

Publications (147)
Article
Polyploidy increases genetic variation in plants, leading to adaptations allowing expansion into novel habitats and increased genetic differentiation among populations isolated by barriers to dispersal. Allium canadense var. canadense is a polyploid taxon distributed within the North American Coastal Plain (NACP) biodiversity hotspot. It is the onl...
Article
Polyploidy has been shown to be a significant driver of diversification among land plants. In addition to whole-genome duplication, other common mechanisms of chromosome number evolution include increases by a multiple of 1.5 in chromosome number due to the fusion of gametes with different ploidy levels (demi-polyploidy), gains or losses of single...
Article
Polyploidy has been shown to be a significant driver of diversification among land plants. In addition to whole-genome duplication, other common mechanisms of chromosome number evolution include increases by a multiple of 1.5 in chromosome number due to the fusion of gametes with different ploidy levels (demi-polyploidy), gains or losses of single...
Article
Full-text available
Recent molecular phylogenetic studies of Dipsacales place Symphoricarpos in a clade containing Leycesteria, Triosteum, and Lonicera. The aim of this research was to analyze the palynomorphological features of taxa of Symphoricarpos and to compare the results with the taxonomic classification scheme and molecular phylogenetic data. Pollen morphology...
Article
Pollinator-mediated selection is a major driver of evolution in flowering plants, contributing to the vast diversity of floral features. Despite long-standing interest in floral variation and the evolution of pollination syndromes in Polemoniaceae, the evolution of floral traits and known pollinators has not been investigated in an explicit phyloge...
Article
Full-text available
The rust fungi (Pucciniales) are the most speciose natural group of plant pathogens, members of which possess the most complex lifecycles in Fungi. How natural selection works on the Pucciniales has been the subject of several hypotheses in mycology. This study uses molecular age estimation using sequence data from multiple loci, and cophylogeny re...
Article
This study aimed to investigate the phylogenetic utility of genotyping-by-sequencing (GBS) data in the southern South American subclade of Valerianaceae (Dipsacales). The variety of forms that has arisen in this clade, presumably over the past 5-10 million years, has all the signatures of an adaptive and rapid radiation. While the phylogeny of Vale...
Article
Typescript. Microfiche copy available in Special Collections Dept. Thesis (M.A.)--San Francisco State University, 1998. Includes bibliographical references (leaves 42-49).
Article
Full-text available
Background: With over 3,500 species encompassing a diverse range of morphologies and ecologies, snakes make up 36% of squamate diversity. Despite several attempts at estimating higher-level snake relationships and numerous assessments of generic- or species-level phylogenies, a large-scale species-level phylogeny solely focusing on snakes has not...
Data
Abridged phylogeny displaying higher-level relationships with all rogue taxa and incertae sedis species eliminated. Maximum-likelihood phylogenetic estimate based on 10 concatenated genes. Tips represent families and sub-families. Commonly recognized higher-level clades are labeled in all caps and bold. Node values represent SHL support values. Ske...
Data
Newick format maximum-likelihood phylogeny for 1745 taxa representing 1652 snake species and 7 outgroup taxa displayed in Figs 2?10. (DOCX)
Data
List of taxa, institutional voucher numbers, and GenBank accession numbers for tissue samples extracted and sequenced in this study. Tissue samples for Boiga siamensis FMNH267726, Chrysopelea ornata LSUHC7158, and Psammodynastes pictus FMNH267940 were represented by clear chromatograms, but placed poorly in preliminary phylogenetic trees, so they w...
Data
Six loci, gene type, gene length, primer name, PCR annealing temperature and primer source. (DOCX)
Data
Rogue taxa as identified by RogueNaRok Web-Server (http://rnr.h-its.org/submit). Each taxon is associated with a raw improvement score (R.I.S.), which represents the fraction of improvement in bootstrap support values throughout the tree when the selected taxon is pruned and all rogue taxa above it are also pruned. We performed one run and chose to...
Data
List of GenBank accession numbers for 7 outgroup taxa and 1615 snake species. Two sequences were deleted during preliminary tree searches and 21 were identified as rogue taxa and pruned from the dataset leaving 1592 snake species from GenBank in the tree. Names represent species names as listed on The Reptile Database (http://www.reptile-database.o...
Data
Data supermatrix comprising 1745 taxa representing 1652 snake species and 7 outgroup taxa, and 9523 base pairs from 10 loci. (PHY)
Article
Full-text available
Leptosiphon Benth. (Polemoniaceae) has 40 taxa, distributed mainly in western North America, with one species in Chile. Phylogenetic studies of Polemoniaceae have consistently supported recognition of Leptosiphon as a separate genus from Linanthus, and resolved an array of taxonomic problems; however, several issues remained unclear for Leptosiphon...
Article
Full-text available
Abstract— Divergence time analyses have become increasingly popular over the past several decades, partly due to the proliferation of molecular data, but also because of the development of methods that do not assume a strict molecular clock. In this review, I provide a brief background to the topic, then highlight several methods for “relaxing” the...
Article
Full-text available
Abstract— Primers from a recently published study that identified a set of low-copy nuclear genes (LCNG) in multiple angiosperms were used to obtain sequence data from three LCNG (Chlp, Agt1, and Hmgs) for phylogenetic inference at the species level. The phylogenetic utility of each of these markers was compared to ITS and seven chloroplast loci (t...
Article
Full-text available
Background Humans and insect herbivores are competing for the same food crops and have been for thousands of years. Despite considerable advances in crop pest management, losses due to insects remain considerable. The global homogenisation of agriculture has supported the range expansion of numerous insect pests and has been driven in part by human...
Article
Ants are one of the most ecologically and numerically dominant group of terrestrial organisms with most species diversity currently found in tropical climates. Several explanations for the disparity of biological diversity in the tropics compared to temperate regions have been proposed including that the tropics may act as a "museum" where older li...
Article
Full-text available
Comparative phylogeography can elucidate the influence of historical events on current patterns of biodiversity and can identify patterns of co-vicariance among unrelated taxa that span the same geographic areas. Here we analyze temporal and spatial divergence patterns of cloud forest plant and animal species and relate them to the evolutionary his...
Data
Sample sizes, molecular markers, substitution models, substitution rates, and temporal calibrations used in this study. (DOC)
Data
Summary statistics for sequence divergence by species. (DOC)
Data
Geographic location and GenBank accession numbers of the cloud forest species used in the study. (DOC)
Data
Details of nucleotide evolutionary models used, fossil and secondary calibrations, substitution rates and taxon sampling to divergence time estimation. (DOC)
Article
Full-text available
Despite an improving knowledge of species distribution patterns in the Neotropics, the processes that underlie these patterns remain uncertain. The tribe Bignonieae (Bignoniaceae), with 21 genera and c. 400 species, is the largest clade of lianas in the Neotropics. The group is an excellent model for biogeographical and evolutionary studies as it i...
Article
Full-text available
Despite an improving knowledge of species distribution patterns in the Neotropics, the processes that underlie these patterns remain uncertain. The tribe Bignonieae (Bignoniaceae), with 21 genera and c. 400 species, is the largest clade of lianas in the Neotropics. The group is an excellent model for biogeographical and evolutionary studies as it i...
Article
Tragopogon comprises approximately 150 described species distributed throughout Eurasia from Ireland and the UK to India and China with a few species in North Africa. Most of the species diversity is found in Eastern Europe to Western Asia. Previous phylogenetic analyses identified several major clades, generally corresponding to recognized taxonom...
Article
Full-text available
The carnivorous plant family Sarraceniaceae comprises three genera of wetland-inhabiting pitcher plants: Darlingtonia in the northwestern United States, Sarracenia in eastern North America, and Heliamphora in northern South America. Hypotheses concerning the biogeographic history leading to this unusual disjunct distribution are controversial, in p...
Data
Taxa of Sarraceniaceae (Darlingtonia, Heliamphora, and Sarracenia species) and outgroups (Actinidia, Clethra, Cyrilla, and Roridula species) used in the phylogenetic analysis and ancestral area reconstruction of the family. All sequences have been deposited in GenBank and vouchers are accessed as noted (CONN – University of Connecticut Herbarium; G...