A5020775591- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Genetic diversity and population structure
- Forest ecology and management
- Plant Reproductive Biology
- Animal Ecology and Behavior Studies
- Fish Ecology and Management Studies
- Genetic and phenotypic traits in livestock
- Species Distribution and Climate Change
- Botany and Plant Ecology Studies
- Botany, Ecology, and Taxonomy Studies
- Peatlands and Wetlands Ecology
- Lichen and fungal ecology
- Forest Management and Policy
- Plant Pathogens and Fungal Diseases
- Wildlife Ecology and Conservation
- Morphological variations and asymmetry
- Rangeland and Wildlife Management
- Bryophyte Studies and Records
- Evolution and Paleontology Studies
- Evolution and Genetic Dynamics
- Microbial Metabolic Engineering and Bioproduction
- Insurance, Mortality, Demography, Risk Management
- Plant Pathogens and Resistance
- Genetically Modified Organisms Research
Rutgers, The State University of New Jersey
2012-2021
University of California, Los Angeles
2012
Umeå Plant Science Centre
2012
Umeå University
2012
Institute of Agrifood Research and Technology
2012
University of Georgia
2009
Australian National University
2009
Appalachian State University
2009
Rutgers Sexual and Reproductive Health and Rights
2005
University of Michigan
1974-1987
Although traditional population fragmentation theory and management has been strongly oriented toward concerns arising from inbreeding depression, recent papers suggest that small populations will be eliminated by demographic and/or environmental events before becomes a problem. We explore the interaction between these factors developing stochastic, discrete time Leslie model incorporates depression. dynamics with three realistic schedules: low growth rate "ungulates," medium "felids," high...
Abstract Pollen dispersal is a critical process that shapes genetic diversity in natural populations of plants. Estimating the pollen curve can provide insight into evolutionary dynamics and essential background for making predictions about changes induced by perturbations. Specifically, we would like to know whether exponential, thin‐tailed (decreasing faster than exponential), or fat‐tailed slower exponential). In latter case, rare events long‐distance will be much more likely. Here...
Gene flow is a key factor in the spatial genetic structure spatially distributed species. Evolutionary biologists interested microevolutionary processess and conservation impact of landscape change require method that measures real time process gene movement. We present novel two-generation (parent-offspring) approach to study (TwoGener) allows us quantify heterogeneity among male gamete pools sampled by maternal trees scattered across estimate mean pollination distance effective...
Abstract Recent studies indicate that polymorphic genetic markers are potentially helpful in resolving genealogical relationships among individuals a natural population. Genetic data provide opportunities for paternity exclusion when genotypic incompatibilities observed individuals, and the present investigation examines power of unambiguous positive determination paternity. Under assumption mother each offspring population is unambiguously known, an analytical expression fraction males...
While anadromous salmonids reproduce in fresh water, most harvests occur at sea. Effective genetic management requires knowledge of the stock (source population) composition harvest. This is accomplished with identification (GSI), which compares genotypes harvested fish those freshwater stocks, assuming that all candidate stocks are identified and their allele frequencies known exactly. We develop methods that: (1) allow for sampling error (2) evaluate possibility unsampled contributing...
Abstract Reconstructing evolutionary history for emerging species complexes is notoriously difficult, with newly isolated taxa often morphologically cryptic and the signature of reproductive isolation restricted to a few genes. Evidence from multiple loci genomes highly desirable, but inputs require ‘common currency’ translation. Here we deploy Shannon information framework, converting into diversity analogue, which provides common currency analysis maternally inherited haploid bi‐parentally...
Abstract We study the behavior of Φft, a recently introduced estimator instantaneous pollen flow, which is basically intraclass correlation inferred cloud genetic frequencies among sample females drawn from single population. Using standard theories identity by descent and spatial processes, we show that Φft depends on average distance dispersal (δ) between sampled mothers (x1¯). Provided are far enough apart (x1¯>5δ), becomes independent x1¯ then inversely proportional to square δ....
Abstract Genealogical analysis is a powerful tool for of reproductive performance in both natural and captive populations, but assignment paternity has always been stumbling block this sort work. Statistical methods determining have undergone several phases development, ranging from straightforward genetic exclusion to based on likelihood criteria. In the present study, we likelihood-based iterative procedure fractional allocation within progeny pool apply method population Chamaelirium...
Abstract poldisp 1.0 is a free software package to estimate the distribution of pollen dispersal distances from mother–offspring diploid genotypic data. It requires spatial coordinates and genotypes sample seed plants their respective maternal progenies, providing estimates average, variance kurtosis curve. also effective reproductive density donors correlation paternity within among sibships. useful for characterizing scale dispersal, assessing variation in male fertility investigating...
Positive correlations between measures of "fitness" and the number electrophoretic loci for which an individual is heterozygous have been observed in many species. Two major hypotheses proposed to explain this phenomenon: inbreeding depression overdominance. Until recently, there has no way distinguish these hypotheses. The overdominance model devised by Smouse (1986) used here a reanalysis Ledig et al.'s (1983) study heterozygosity growth rate eight populations pitch pine contrasted with...
We introduce a novel indirect method of estimating the pollen dispersal curve from mother-offspring genotypic data. Unlike an earlier approach (TwoGener), this is based on normalized measure correlated paternity between female pairs whose expectation does not explicitly depend unknown effective male population density (d(e)). investigate statistical properties new method, by comparison with those TwoGener, considering sensitivity to reductions d(e), relative census density, resulting unequal...
Summary Patients in an affective disorders out-patient clinic were studied with four depression rating scales: the Hamilton scale (HRS) Carroll (CRS) a clinical global of (CGRD) and visual analogue (VAS). The overall correlations between self ratings (CRS, VAS) observer (HRS, CGRD) highly significant. Both HRS CRS distinguished mild from moderate, moderate severe depression. scores increased more rapidly than increasing severity concordance was highest for two structured instruments (HRS...
Summary The Ticuna are an Amerindian tribe of Central Amazonas, a key location in theories the peopling eastern South America. results typing some 1760 members with respect to 37 different genetic systems reported, as HLA typings on subsample 129 persons. Salient findings include following. (1) Except for high frequency L Ms allele and unusual combination frequencies, there no notable commonly studied polymorphic systems. A multivariate treatment six most polymorphisms accords ‘average’...
Abstract The Columbia Basin once supported a diversity of native fishes and large runs anadromous salmonids that sustained substantial fisheries cultural values. Extensive land conversion, watershed disruptions, subsequent fishery declines have led to one the most ambitious restoration programs in world. Progress has been made, but is expensive (exceeding US$300M/year), it remains unclear whether habitat actions, particular, can be successful. A comprehensive approach needed guide...
Abstract The distance of pollen movement is an important determinant the neighborhood area plant populations. In earlier studies, we designed a method for estimating dispersal, on basis analysis differentiation among clouds sample females, spaced across landscape. was based solely estimate global level total array sampled females. Here, develop novel estimators, divergence all pairs assuming that independent adult population density available. A simulation study shows estimators are slightly...