James H. Roberds

Works (11)

Updated: July 15th, 2023 21:15

2004 article

On-Bark Behavior of Dendroctonus frontalis: A Markov Chain Analysis

Bishir, J., Roberds, J. H., & Strom, B. L. (2004, May 1). Journal of Insect Behavior.

By: J. Bishir n, J. Roberds* & B. Strom*

author keywords: Scolytidae; southern pine beetle; host selection; host recognition; transition probabilities; absorbing states
topics (OpenAlex): Insect and Arachnid Ecology and Behavior; Plant and animal studies; Animal Behavior and Reproduction; Forest Insect Ecology and Management
TL;DR: This work applied Markov chain analysis to on-bark behaviors of the southern pine beetle, Dendroctonus frontalis Zimmermann, and found that by developing chains for each sex, sexually dichotomous fighting behaviors were revealed. (via Semantic Scholar)
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UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (OpenAlex)
15. Life on Land (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2001 article

On the structure of attractors for discrete, periodically forced systems with applications to population models

Selgrade, J. F., & Roberds, J. H. (2001, October 1). Physica D Nonlinear Phenomena.

By: J. Selgrade n & J. Roberds*

author keywords: periodic forcing; attractors; discrete population models
topics (OpenAlex): Mathematical and Theoretical Epidemiology and Ecology Models; Evolution and Genetic Dynamics; Nonlinear Dynamics and Pattern Formation
TL;DR: A method is presented which shows that if the amplitude of the k-periodic forcing is small enough then the attractor for the forced system is the union of k homeomorphic subsets. (via Semantic Scholar)
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10. Reduced Inequalities (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2000 article

Dynamical analysis of density-dependent selection in a discrete one-island migration model

Roberds, J. H., & Selgrade, J. F. (2000, March 1). Mathematical Biosciences.

By: J. Roberds* & J. Selgrade n

author keywords: selection; migration; genotype; density-dependence; bifurcation
MeSH headings : Alleles; Animals; Emigration and Immigration; Genetic Variation / genetics; Geography; Humans; Models, Genetic; Nonlinear Dynamics; Polymorphism, Genetic / genetics; Population Dynamics; Selection, Genetic
topics (OpenAlex): Mathematical and Theoretical Epidemiology and Ecology Models; Evolution and Genetic Dynamics; Evolutionary Game Theory and Cooperation
TL;DR: A system of non-linear difference equations is used to model the effects of density-dependent selection and migration in a population characterized by two alleles at a single gene locus, and properties for a genetically important class of equilibria associated with complete dominance in fitness are described. (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

1998 article

Genetic variance in the F2 generation of divergently selected parents

Koshy, M. P., Namkoong, G., & Roberds, J. H. (1998, October 1). Theoretical and Applied Genetics.

By: M. Koshy*, G. Namkoong* & J. Roberds n

author keywords: F-2 genetic variance; divergent selection; provenance hybrids
topics (OpenAlex): Evolution and Genetic Dynamics; Genetic diversity and population structure; Plant Reproductive Biology
TL;DR: The size of the genetic variance to the population divergence is related based on a forward and backward mutation model at a locus with two alleles with additive gene action at a region with high population divergence. (via Semantic Scholar)
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UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

1997 article

Genotype by environment interaction for index traits that combine growth and wood density in loblolly pine

McKeand, S. E., Eriksson, G., & Roberds, J. H. (1997, June 1). Theoretical and Applied Genetics, Vol. 94, pp. 1015–1022.

By: S. McKeand n , G. Eriksson * & J. Roberds*

author keywords: gain; K-statistic; Pinus taeda L; selection index; stability; tree improvement
topics (OpenAlex): Forest ecology and management; Genetics and Plant Breeding; Agroforestry and silvopastoral systems
TL;DR: The interaction variance of an index trait is shown to be a function of the index coefficients and the G×E variances and covariances for its constituent traits, and for some conditions it surpasses the magnitude of G–E variance for each component trait. (via Semantic Scholar)
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UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

1997 article

Limit theorems and a general framework for risk analysis in clonal forestry

Bishir, J., & Roberds, J. (1997, May 1). Mathematical Biosciences.

By: J. Bishir n & J. Roberds n

MeSH headings : Forestry / statistics & numerical data; Mathematics; Models, Biological; Risk; Trees / genetics; Trees / growth & development
topics (OpenAlex): Forest Management and Policy; Bioenergy crop production and management; Genetically Modified Organisms Research
TL;DR: It is shown that the proportion S converges in distribution and that, under general conditions, a moderate number of clones, usually no more than 20 to 40 and often fewer, provides equivalent or better protection against catastrophic loss than does a large number of clone. (via Semantic Scholar)
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UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

1997 article

PERIOD-DOUBLING BIFURCATIONS FOR SYSTEMS OF DIFFERENCE EQUATIONS AND APPLICATIONS TO MODELS IN POPULATION BIOLOGY

SELGRADE, J. A. M. E. S. F., & ROBERDS, J. A. M. E. S. H. (1997, July 1). Nonlinear Analysis.

By: J. Selgrade n & J. Roberds n

author keywords: discrete models; period-doubling bifurcation; Henon map; population genetics; pioneer and climax populations
topics (OpenAlex): Animal Ecology and Behavior Studies; Mathematical and Theoretical Epidemiology and Ecology Models; Sustainability and Ecological Systems Analysis
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Source: Web Of Science
Added: August 6, 2018

1997 article

Risk analyses in clonal forestry

Roberds, J. H., & Bishir, J. W. (1997, March 1). Canadian Journal of Forest Research.

By: J. Roberds* & J. Bishir*

topics (OpenAlex): Bioenergy crop production and management; Forest Management and Policy; Genetically Modified Organisms Research
TL;DR: Alternative models and methods that have been proposed to investigate the effect of number of clones on risk of plantation failure following an unforeseen catastrophic event indicate that use of 30 to 40 unrelated clones in plantations provides protection against catastrophic failure roughly equivalent to the use of large numbers of unrelated clones. (via Semantic Scholar)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

1991 article

Effective number of pollen parents in clonal seed orchards

Roberds, J. H., Friedman, S. T., & El-Kassaby, Y. A. (1991, September 1). Theoretical and Applied Genetics.

By: J. Roberds n, S. Friedman* & Y. El-Kassaby*

author keywords: VARIANCE EFFECTIVE NUMBER; TEMPORAL METHOD; GENE FREQUENCY VARIANCE; GENETIC DRIFT; MALE GAMETE POPULATIONS
topics (OpenAlex): Plant and animal studies; Ecology and Vegetation Dynamics Studies; Plant Reproductive Biology
TL;DR: The estimation of effective numbers of pollen parents from seed samples collected from individual ramets in clonal seed orchards of forest tree species is presented, which are variance effective numbers for populations of male gametes that are successful in uniting with ovules to produce viable seed. (via Semantic Scholar)
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UN Sustainable Development Goal Categories
15. Life on Land (Web of Science)
Source: Web Of Science
Added: August 6, 2018

1990 journal article

Genetic analysis of risk in clonal populations of forest trees

Theoretical and Applied Genetics, 79(6), 841.

By: J. Roberds, G. Namkoong & T. Skroppa

Source: NC State University Libraries
Added: August 6, 2018

1990 journal article

Height response functions for white ash provenances grown at different latitudes

Silvae Genetica, 39(3-4), 121.

By: J. Roberds, J. Hyun, G. Namkoong & G. Rink

Source: NC State University Libraries
Added: August 6, 2018

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