Dorset W. Trapnell

Dorset W. Trapnell
University of Georgia | UGA · Department of Plant Biology

AB (Colgate University), MBA (Rutgers University), MS (University of Georgia), PhD (University of Georgia)

About

59
Publications
7,719
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1,093
Citations
Citations since 2016
16 Research Items
717 Citations
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2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140

Publications

Publications (59)
Article
Colonization is a fundamental ecological process that is important for the persistence of species, particularly when a changing environment necessitates range shifts. Vacant habitats available for colonization often arise from landscape disturbance. Colonization and population expansion processes can be inferred by examining the levels and spatial...
Article
Full-text available
Accelerating climate change is expected to cause range shifts of numerous taxa worldwide. While climatic projections and predicted consequences typically focus on the future (2050 or later), a measurable change in climatic conditions has occurred over recent decades. We investigate whether recent climate change has caused measurable shifts in suita...
Article
Many orchids are characterized by small, patchily distributed populations. Resolving how they persist is important for understanding the ecology of this hyper-diverse family, many members of which are of conservation concern. Ten populations of the common terrestrial orchid Drakaea glyptodon from south-western Australia were genotyped with ten nucl...
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Dispersal and colonization are among the most important ecological processes for species persistence as they allow species to track changing environmental conditions. During the last glacial maximum (LGM), many cold-intolerant Northern Hemisphere plants retreated to southern glacial refugia. During subsequent warming periods, these species expanded...
Article
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Variation in selfing rates within and among populations of hermaphroditic flowering plants can strongly influence the evolution of reproductive strategies and the genetic structure of populations. This intraspecific variation in mating patterns may reflect both genetic and ecological factors, but the relative importance of these factors remains poo...
Article
Aim Predictions of species' responses to accelerating global climate change require an understanding of historical range shifts. However, large‐scale phylogeographical studies of Eastern North American understorey plant taxa are relatively scarce. Here we employ ecological niche modelling and genetic analyses for inference of optimal pawpaw habitat...
Article
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Researchers have long assumed that plant spatial location influences plant reproductive success and pollinator foraging behaviour. For example, many flowering plant populations have small, linear or irregular shapes that increase the proportion of plants on the edge, which may reduce mating opportunities through both male and female function. Addit...
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Green plants (Viridiplantae) include around 450,000–500,000 species1,2 of great diversity and have important roles in terrestrial and aquatic ecosystems. Here, as part of the One Thousand Plant Transcriptomes Initiative, we sequenced the vegetative transcriptomes of 1,124 species that span the diversity of plants in a broad sense (Archaeplastida),...
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Premise: Genetically diverse sibships are thought to increase parental fitness through a reduction in the intensity of sib competition, and through increased opportunities for seedling establishment in spatially or temporally heterogeneous environments. Nearly all research on mate diversity in flowering plants has focused on the number of fathers...
Article
Spatial patterns of genetic variation can reveal otherwise cryptic evolutionary and landscape processes. In northwestern Costa Rica, an approximately concordant genetic discontinuity occurs among populations of several plant species. We conducted phylogeographic analyses of an epiphytic orchid, Brassavola nodosa, to test for genetic discontinuity a...
Article
Premise of the study: Flowering initiation, duration and magnitude, and degree of flowering synchrony within a population can affect the reproductive fitness of individuals. We examined the flowering phenology within a population of the tropical dry forest Guanacaste tree (Enterolobium cyclocarpum) to gauge the impact of phenological variation amo...
Article
Better understanding of the mechanisms by which novel species arrive in marine communities is not only important for documenting such arrivals but can also lead to a better awareness of the abiotic and biotic limits on species distributions. Here we integrate spatial survey data, metapopulation hindcast modeling, and new genetic data from allozymes...
Article
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Premise of the study: Selfing rates vary widely within and among populations of self-compatible flowering plants. This variation is often attributed to differences in the amount and timing of self and outcross pollen deposition on stigmas, as well as to the influence of postpollination mechanisms that control fertilization success. This study expl...
Article
Identifying factors governing the origin, distribution, and maintenance of Neotropical plant diversity is an enduring challenge. To explore the complex and dynamic historical processes that shaped contemporary genetic patterns for a Central American plant species, we investigated the spatial distribution of chloroplast haplotypes of a geographicall...
Article
With the increasing availability of high-throughput sequencing, phylogenetic analyses are no longer constrained by the limited availability of a few loci. Here, we describe a sequence capture methodology, which we used to collect data for analyses of diversification within Sabal (Arecaceae), a palm genus native to the south-eastern USA, Caribbean,...
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Microsatellite loci were developed for the epiphytic pencil orchid Dendrobium calamiforme for population genetic and phylogeographic investigation of this Australian taxon. Nineteen microsatellite loci were identified from an Illumina paired-end shotgun library of D. calamiforme. Polymorphism and genetic diversity were assessed in 24 individuals fr...
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Background and Aims: At least seven species of Agave, including A. parryi, were cultivated prehistorically in Arizona, serving as important sources of food and fibre. Many relict populations from ancient cultivation remain in the modern landscape, offering a unique opportunity to study pre-Columbian plant manipulation practices. This study examined...
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Populations of many species are isolated within narrow elevation bands of Neotropical mountain habitat, and how well dispersal maintains genetic connectivity is unknown. We asked whether genetic structure of an epiphytic orchid, Epidendrum firmum, corresponds to gaps between Costa Rican mountain ranges, and how these gaps influence pollen and seed...
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Populations of many species are isolated within narrow elevation bands of Neotropical mountain habitat, and how well dispersal maintains genetic connectivity is unknown. We asked whether genetic structure of an epiphytic orchid, Epidendrum firmum, corresponds to gaps between Costa Rican mountain ranges, and how these gaps influence pollen and seed...
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Summary The distribution of rare plants may be limited by environmental or density-dependent factors that reduce population growth and persistence. The relative importance of environmental limitations vs. the degree to which conspecifics influence recruitment may determine optimal management strategies for plants of conservation concern. We sowed s...
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Symbiotic interactions are common in nature. In dynamic or degraded environments, the ability to associate with multiple partners (i.e. broad specificity) may enable species to persist through fluctuations in the availability of any particular partner. Understanding how species-interactions vary across landscapes is necessary to anticipate direct a...
Article
Colonization of vacant habitat is a fundamental ecological process that affects the ability of species to persist and undergo range modifications in continually shifting landscapes. Thus, understanding factors that affect and limit colonization has important ecological and conservation implications. Epiphytic orchids are increasingly threatened by...
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Full-text available
Unlabelled: • Premise of the study: Microsatellite markers were isolated and characterized in Mimulus ringens (Phrymaceae), a herbaceous wetland perennial, to facilitate studies of mating patterns and population genetic structure. • Methods and results: A total of 42 polymorphic loci were identified from a sample of 24 individuals from a singl...
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Premise of the study: Ten microsatellite loci were isolated and characterized for the neotropical epiphytic orchid Epidendrum firmum to examine levels of genetic diversity and genetic structure at multiple spatial scales. Methods and results: We screened loci in 12-25 individuals from each of two populations in Costa Rica and identified 10 polym...
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Genetic diversity within and among nine Andropogon gerardii (Big Bluestem) populations from various physiographic regions of North and South Carolina was assessed. Genetic diversity was high at both the species level and at the population level. At the species level, percent polymorphic loci (P) was 96.4% (27 of 28 loci), the number of alleles per...
Conference Paper
Background/Question/Methods Historical biogeography, habitat suitability, the distribution of essential mycorrhizal fungi, and the dispersal of pollen and seeds across a landscape all contribute to spatial genetic structure of rare orchid species. We investigated spatial genetic structure of the Neotropical epiphytic orchid Epidendrum firmum in m...
Conference Paper
Background/Question/Methods In biological landscapes, spatial genetic structure of species may occur as the result of historical processes. Such partitioning can influence patterns of genetic variation both within and between populations of the same species. In this study, we used 2 chloroplast markers to measure genetic variation within and amon...
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The southeastern United States and Florida support an unusually large number of endemic plant species, many of which are threatened by anthropogenic habitat disturbance. As conservation measures are undertaken and recovery plans designed, a factor that must be taken into consideration is the genetic composition of the species of concern. Here we de...
Article
Neutral genetic markers have been employed in several ways to understand seed dispersal patterns in natural and human modified landscapes. Genetic differentiation among spatially separated populations, using biparentally and maternally inherited genetic markers, allows determination of the relative historical effectiveness of pollen and seed disper...
Conference Paper
Background/Question/Methods Symbiotic mycorrhizal fungi are ubiquitous in plant communities. Understanding the composition of mycorrhizal communities could advance the conservation of rare or exploited plants. All orchid species have obligate symbioses with mycorrhizal fungi because orchid seeds cannot germinate without associating with an approp...
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Autopolyploid taxa present numerous challenges for population genetic analyses due to difficulties determining allele dosage. Dosage ambiguity hinders accurate assessment of allele frequencies, multilocus genotypes (MLGTs), as well as levels and patterns of clonality. The pervasiveness of polyploidy in the evolutionary history of plant taxa makes t...
Article
Several Agave species have played an important ethnobotanical role since prehistory in Mesoamerica and semiarid areas to the north, including central Arizona. We examined genetic variation in relict Agave parryi populations northeast of the Mogollon Rim in Arizona, remnants from anthropogenic manipulation over 600 years ago. We used both allozymes...
Article
We isolated nine microsatellite loci from the Guanacaste tree (Enterolobium cyclocarpum) and optimized them for future research on breeding populations of this species. Loci were screened across 53 individuals from one population and were shown to be variable with the number of alleles per locus ranging from five to 15. Polymorphic information cont...
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Full-text available
Pre-Columbian farmers cultivated several species of agave in central Arizona from ca. A.D. 600-1350. Because of the longevity and primarily asexual reproduction of these species, relict agave clones remain in the landscape and provide insights into pre-Columbian agricultural practices. We analyzed variation in allozyme allele frequencies to infer g...
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Pollinator behavior plays a central role in determining patterns of pollen-mediated gene movement in zoophilous angiosperms. A species' floral display can strongly influence the behavior of its pollinators and thereby affect its evolutionary pathway. We used paternity analysis to directly measure and describe mating patterns within 15 populations o...
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Epiphytes comprise ca. 10% of all vascular plant species and therefore contribute substantially to plant diversity, particularly in tropical and subtropical regions. Little is known, however, about the specificity of the relationship between epiphytes and their phorophytes. Phorophyte specificity is assessed for the neotropical epiphytic orchid, La...
Article
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An exhaustive survey of vascular epiphytes on a single mature canopy tree in a Costa Rican tropical premontane wet forest revealed an extraordinary level of epiphyte diversity. A total of 126 mor-phospecies representing at least 52 genera and 21 plant families were found growing epiphytically on the phorophyte (host tree), accounting for more than...
Article
Understanding mating patterns and gene movement in plant populations occupying highly disturbed landscapes is essential for insights into their long-term survival. We used allozyme genetic markers to examine mating patterns and to directly measure pollen flow in the Central American epiphytic orchid, Laelia rubescens. Study populations were located...
Article
Insights into processes that lead to the distribution of genetic variation within plant species require recognition of the importance of both pollen and seed movement. Here we investigate the contributions of pollen and seed movement to overall gene flow in the Central American epiphytic orchid, Laelia rubescens. Genetic diversity and structure wer...
Article
Epiphytic plants occupy three-dimensional space, which allows more individuals to be closely clustered spatially than is possible for populations occupying two dimensions. The unique characteristics of epiphytes can act in concert to influence the fine-scale genetic structure of their populations which can, in turn, influence mating patterns and ot...
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Morphological and habitat similarities among the five species of the terrestrial orchid genus Calopogon have led to nomenclatural and taxonomic confusion. The taxa are marked by subtle character differences and little apparent reproductive isolation. Here we investigate allozyme diversity at the species level and the partitioning of genetic variati...
Article
Full-text available
Field observations of a walkingstick,Calynda bicuspis, reveal that its eggs are rapidly discovered and transported by the ponerine ant,Ectatomma ruidum during both dry and wet seasons in Costa Rica. The importance of the egg capitulum in inducing ant transport was established by presenting eggs from which the capitulum had been removed or sealed. U...
Article
Insights into the long-term survival potential of plant species occupying remnant habitat fragments require an understanding of the processes responsible for the distribution of genetic variation within species. This research project examines the partitioning of genetic variation at multiple spatial scales, as well as patterns of mating and gene mo...

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