J. Nason

Publications102
h-index41
Citations6,971
Highly Influential Citations688
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Spatial genetic structure of a tropical understory shrub, PSYCHOTRIA OFFICINALIS (RuBIACEAE)
Population Graphs: the graph theoretic shape of genetic structure
TLDR
This work introduces a novel approach (Population Graphs) that focuses on the analysis of marker‐based population genetic data within a graph theoretic framework and evaluates hypotheses regarding historical vicariance, isolation by distance, population‐level assignment and the importance of specific populations to species‐wide genetic connectivity.
Landscape modelling of gene flow: improved power using conditional genetic distance derived from the topology of population networks
TLDR
This manuscript focuses on the use of conditional genetic distance (cGD) derived from population networks and the utility of extracting potentially confounding effects caused by correlations between phylogeographic history and contemporary ecological factors in landscape genetic analyses.
Reproductive and Genetic Consequences of Forest Fragmentation: Two Case Studies of Neotropical Canopy Trees
TLDR
The observed patterns of dispersal in S. mombin and Ficus demonstrate the potential for ecologically and evolutionarily significant pollinator and pollen movement among populations occurring in both disturbed and continuous forest environments, and demonstrates how the conservation of biodiversity in spatially isolated reserves may be dependent on the preservation of forest elements in a surrounding fragmented landscape.
Differential lineage-specific amplification of transposable elements is responsible for genome size variation in Gossypium.
TLDR
To understand the modes and mechanisms that underlie variation in genome composition, sequence data from whole genome shotgun libraries for three representative diploid members of Gossypium were generated and a pattern of lineage-specific amplification of particular subfamilies of retrotransposons within each species studied was demonstrated.
SPATIAL POPULATION GENETIC STRUCTURE IN TRILLIUM GRANDIFLORUM: THE ROLES OF DISPERSAL, MATING, HISTORY, AND SELECTION
TLDR
The observed increase in SPGS between J and R stages has two potential explanations: history and local selection and the observed low total allelic diversity is consistent with a past bottleneck: a possible historical explanation.
The breeding structure of a tropical keystone plant resource
TLDR
Paternity analysis techniques are used to reconstruct the genotypes of pollen donor trees and to estimate pollen dispersal distances and breeding population size parameters for Panamanian populations of seven species of monoecious strangler figs, a particularly widespread and influential group of keystone producers.
HOST‐ASSOCIATED GENETIC DIFFERENTIATION IN PHYTOPHAGOUS INSECTS: GENERAL PHENOMENON OR ISOLATED EXCEPTIONS? EVIDENCE FROM A GOLDENROD‐INSECT COMMUNITY
TLDR
A survey of HAD in a community of herbivores indicates that ecological (perhaps sympatric) speciation may have been responsible for generating a significant fraction of the extant diversity of phytophagous insects.
The influence of seed dispersal mechanisms on the genetic structure of tropical tree populations
TLDR
Allozyme analyses of three tropical tree species belonging to the moist tropical forest of Barro Colorado Island, Republic of Panama were used to describe variation in the scale and intensity of genetic structure within their populations, finding the genetic structure of seedlings and immature trees in the low-density, wind-dispersed species was the coarsest and strongest.
HISTORICAL VICARIANCE AND POSTGLACIAL COLONIZATION EFFECTS ON THE EVOLUTION OF GENETIC STRUCTURE IN LOPHOCEREUS, A SONORAN DESERT COLUMNAR CACTUS
TLDR
The phylogeographic structure of L. schottii suggests that Sonoran Desert plant species may exhibit genetic signatures of postglacial range expansion and gene flow as well as vicariance, and significant evidence of isolation by distance within peninsular and continental phylogroups but not between them is found, consistent with historical vicarance between but not within these regions.
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