A5008677867- Plant Diversity and Evolution
- Genetic diversity and population structure
- Plant and Fungal Species Descriptions
- Plant and animal studies
- Genomics and Phylogenetic Studies
- Plant Taxonomy and Phylogenetics
- Ecology and Vegetation Dynamics Studies
- Phytochemistry and Biological Activities
- Sesquiterpenes and Asteraceae Studies
- Evolution and Paleontology Studies
- Mediterranean and Iberian flora and fauna
- Plant Reproductive Biology
- Botany, Ecology, and Taxonomy Studies
- Plant Parasitism and Resistance
- Lichen and fungal ecology
- Botany and Plant Ecology Studies
- Chromosomal and Genetic Variations
- Botanical Research and Chemistry
- Ethnobotanical and Medicinal Plants Studies
- Plant Ecology and Taxonomy Studies
- Plant Pathogens and Resistance
- Fish Ecology and Management Studies
- Plant Pathogens and Fungal Diseases
- Natural product bioactivities and synthesis
- Marine and fisheries research
University of Kansas
2014-2023
Biodiversity Research Institute
2015
American Museum of Natural History
2003-2010
University of Alaska Fairbanks
2009
Universidad de Antioquia
2008
St. Olaf College
2008
Sam Houston State University
2007
Natural History Museum
2005
Saint Mary's College
2003
Eastern Illinois University
2001
A phylogenetic analysis of a combined data set for 560 angiosperms and seven outgroups based on three genes, 18S rDNA (1855 bp), rbcL (1428 atpB (1450 bp) representing total 4733 bp is presented. Parsimony was expedited by use new computer program, the RATCHET. jackknifing performed to assess support clades. The combination sets numerous species has resulted in most highly resolved strongly supported topology yet obtained angiosperms. In contrast previous analyses single much spine tree...
A phylogenetic analysis of a combined data set for 560 angiosperms and seven outgroups based on three genes, 18S rDNA (1855 bp), rbcL (1428 atpB (1450 bp) representing total 4733 bp is presented. Parsimony was expedited by use new computer program, the RATCHET. jackknifing performed to assess support clades. The combination sets numerous species has resulted in most highly resolved strongly supported topology yet obtained angiosperms. In contrast previous analyses single much spine tree...
To explore the feasibility of parsimony analysis for large data sets, we conducted heuristic searches and bootstrap analyses on separate combined DNA sets 190 angiosperms three outgroups. Separate 18S rDNA (1,855 bp), rbcL (1,428 atpB (1,450 bp) sequences were into a single matrix 4,733 bp in length. Analyses set show great improvements computer run times compared to those pairs. Six + conducted; all cases TBR branch swapping was completed, generally within few days. In contrast, not...
Abstract The Macaronesian clade of Crassulaceae comprises four genera (Aichryson, Aeonium, Greenovia, and Monanthes) that are largely endemic to Macaronesia, a region encompassing the Azores, Madeira, Cape Verde, Canary, Salvage Islands. monophyly this has been supported by recent family-level phylogenetic analyses; however, relationships within remain uncertain. To resolve clade, we sequenced several chloroplast DNA regions (matK trnL-trnF psbA-trnH spacer regions) nuclear rDNA ITS region....
The flora of Macaronesia, which encompasses five Atlantic archipelagos (Azores, Canaries, Madeira, Cape Verde, and Salvage), is exceptionally rich diverse. Spectacular radiation numerous endemic plant groups has made the Macaronesian islands an outstanding area for studies evolution speciation. Despite intensive investigation in last 15 years, absolute age rate diversification are poorly known Macaronesia. Here we report molecular divergence estimates rates representative, putative rapid...
Environmental change can create opportunities for increased rates of lineage diversification, but continued species accumulation has been hypothesized to lead slowdowns via competitive exclusion and niche partitioning. Such density-dependent models imply tight linkages between diversification trait evolution, there are plausible alternative models. Little is known about the association key ecological phenotypic traits at broad phylogenetic spatial scales. Do evolutionary coincide with lags...
We sought novel evolutionary insights for the highly diverse Saxifragales by constructing a large phylogenetic tree encompassing 36.8% of species-level biodiversity. •We built 909 species and used this hypothesis to examine character evolution annual or perennial habit, woody herbaceous ovary position, petal number, carpel stamen ratio. employed likelihood approaches investigate effect habit life history on speciation extinction within clade. •Two major shifts occurred from ancestor with...
are then summarized as a bootstrap consensus tree. The frequency at which each clade is recovered termed the proportion, or support. Jackknife analyses (reviewed by Miller, 1974) have also been used to estimate internal support on phylogenetic trees (e.g., Farris et al., 1996; Kallersjo 1999). jackknife differs from in that characters sampled original data set without replacement construct replicate has fewer than original. Replicate sets subjected analysis, and results of these searches...
Plant molecular systematic studies of closely related taxa have relied heavily on sequence data from nuclear ITS and cpDNA. Positive attributes using include the rapid rate evolution compared to most plastid loci availability universal primers for amplification sequencing. On other hand, may not adequately track organismal phylogeny if concerted high rDNA array copy number do permit identification orthologous copies. Shaw et al. ( American Journal Botany 92: 142–166) recently identified nine...
Chloroplast gene matK sequence data were used to estimate the phylogeny of 112 species Crassulaceae sampled from 33 genera and all six recognized subfamilies. Our analyses suggest that five subfamilies in most recent comprehensive classification family are not monophyletic. Instead, we recovered a basal split between southern African Crassula clade (Crassuloideae) rest (Sedoideae). These results compatible with studies cpDNA restriction site analyses. Within Sedoideae, four subclades also...
To elucidate relationships at deep levels within Saxifragaceae we analyzed phylogenetically a data set of sequences for six DNA regions, four representing the chloroplast genome (rbcL, matK, trnL-trnF, psbA-trnH) and two from nuclear (ITS expansion segments 26S rDNA). A total 6676 bp was aligned per taxon, 4559 1878 genomes, respectively. Chloroplast trees agreed closely, prompting analysis combined, six-gene set. Application both parsimony maximum likelihood methods yielded similar...
PREMISE OF THE STUDY: Evolutionary radiations provide opportunities to examine large‐scale patterns in diversification and character evolution, yet are often recalcitrant phylogenetic resolution due rapid speciation events. The plant genus Penstemon has been difficult resolve using Sanger sequence‐based markers, leading the hypothesis that it represents a recent North American radiation. current study demonstrates utility of multiplexed shotgun genotyping (MSG), style restriction...
Plants of oceanic islands, often remarkably divergent morphologically from continental relatives, are useful models for studying evolution and speciation because is telescoped in time space. Prior studies revealed little DNA sequence variation within the clade ca. 10 Canary Island species Tolpis, which precluded resolving relationships. The present study assessed utility automated analysis inter-simple repeat (ISSR) loci relationships using 264 individuals 36 populations all recognized three...
• Premise of the study: Endemic plants on oceanic islands have long served as model systems for studying patterns and processes evolution. However, phylogenetic studies island frequently illustrate a decoupling molecular divergence ecological/morphological diversity, resulting in phylogenies lacking resolution required to interpret evolution context. The current study uses primarily Macaronesian flowering plant genus Tolpis utility multiplexed shotgun genotyping (MSG) resolving relationships...
• Premise of the study: A recurrent explanation for phylogeographic discontinuities in Baja California Peninsula and Sonoran Desert Region has been association vicariant events with Pliocene Pleistocene seaway breaks. Nevertheless, despite its relevance plant dispersal, other explanations such as ecological paleoclimatic factors have received little attention. Here, we analyzed role several these to describe patterns desert mistletoe, Phoradendron californicum . Methods: Using noncoding...
Baker's law posits that self‐compatible (SC) plants will be more successful than self‐incompatible (SI) in long‐distance colonization because a single propagule can establish viable population. Oceanic islands represent ideal systems to test insular lineages have, without question, originated from dispersal. The dilemma of is one an SC plant would population with low genetic diversity, which could limit subsequent evolution. By contrast, SI ancestor, having outcrossing source population,...
Abstract With the advent of PCR and DNA sequencing, data have been widely applied to assessment relationships among taxa recent origin (e.g., island endemics). Numerous studies used sequence and/or cpDNA RFLPs reconstruct phylogeny for many members Macaronesian flora. One such genus that has received attention recently is Tolpis (Asteraceae: Lactuceae). Sequences gene ndhF provided strong support a clade comprising species are largely endemic Macaronesia, exclusion several European had...
methodology employed to estimate phylogeny. This is not say that issues such as the use of morphological data versus molecular or whether combine for phylogenetic analyses have been debated in past. Clearly, these and many other received a considerable amount debate literature. Possibly one most rigorously topics choice an optimality criterion. In general, there are three basic methods used phylogeny, including distance, maximum parsimony (MP), likelihood (ML). The relative merits...
Plants endemic to oceanic islands represent some of the most unusual and rare taxa in world. Enzyme electrophoresis was used assess genetic diversity within divergence among all species a small genus plants on Canary Islands. Our results show that Tolpis is similar many other island groups having generally low allozyme species, with highest found four endemics. The two highly localized T. glabrescens crassiuscula are each divergent from Canaries. coronopifolia also at loci; this only...