E. Davis Parker

Yale University

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Alex Dornburg

University of North Carolina at Charlotte

Chris Jones

Met Office

Thomas J. Near

Yale University

Monica Niklasson

University of Copenhagen

Steven Hecht Orzack

Fresh Pond Research Institute

Valery E. Forbes

Florida Atlantic University

Robert K. Selander

American Museum of Natural History

Jane Frydenberg

Aarhus University

William Mcclellan

Emory University

Arthur Schuchardt

National Research Council

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National Research Council

238

National Fire Protection Association

207

University of Baltimore

American Society For Testing and Materials

American Association For The Advancement of Science

Columbia University

University of Pennsylvania

National Safety Council

American Standard (United States)

Yale University

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Genetic diversity and the phylogeography of parthenogenesis: comparing bisexual and thelytokous populations of Nemasoma varicorne (Diplopoda: Nemasomatidae) in Denmark

Hereditas (2002)

LONE HOY JENSEN Henrik Enghoff Jane Frydenberg E. Davis Parker

Parthenogenesis

Monophyly

10.1034/j.1601-5223.2002.1360302.x

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Citations (33)

SEX‐RATIO CONTROL IN A PARASITIC WASP, NASONIA VITRIPENNIS . I. GENETIC VARIATION IN FACULTATIVE SEX‐RATIO ADJUSTMENT

Evolution (1986)

Steven Hecht Orzack E. Davis Parker

The precision of sex-ratio control in a parasitic wasp, Nasonia vitripennis (Pteromalidae) was investigated using a series of “sequential oviposition” experiments in which a female oviposits on hosts previously visited by another female. There are clear genotypic differences in the averages of these “second” sex ratios. Indeed, one genotype does not alter sex ratio detectably. Two genotypes with identical average sex ratios on previously unparasitized hosts have distinct second sex ratios. Artificial selection on one strain to produce less female-biased “first” sex ratios in previously unparasitized hosts has not affected the ability of that strain to adjust sex ratio, suggesting that the proximal mechanisms controlling first and second sex ratios can change independently. Adjustment of sex ratios is accomplished by the production of fewer females and more males. Sex ratios produced in control hosts indicate that sex ratios are adjusted in hosts independently of one another. Second sex-ratio response also appears to be independent of host clumping. These results represent both a challenge to our present understanding of sex-ratio evolution (see Orzack, 1986) and a foundation for experimental description of this important adaptation.

Nasonia vitripennis

Facultative

Variation (astronomy)

10.1111/j.1558-5646.1986.tb00475.x

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Citations (53)

Ecological Implications of Clonal Diversity in Parthenogenetic Morphospecies

American Zoologist (1979)

E. Davis Parker

Most parthenogenetic animal taxa which have been investigated electrophoretically, cytologically, or with tissue grafting techniques are clonally diverse. I have examined data on multiclonal parthenogenetic populations using ecological diversity measures to elucidate patterns of clonal coexistence. Analysis of a discrete population cage experiment on clones of Drosophila mercatorum revealed monotonic decay of clonal diversity and evenness; however, in a continuous generation cage, clonal diversity appeared to stabilize. Clonal diversity and evenness fluctuated widely over time in several multiclonal populations of Daphnia magna although no clonal extinction was observed. There were few spatial trends in clonal diversity and evenness within parthenogenetic taxa. It is suggested that the degree of clonal differentiation, determined by the mode of clonal origin, is important in determining whether or not selection occurs among sympatric clones

Parthenogenesis

10.1093/icb/19.3.753

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Citations (213)

Maintenance of clonal diversity in Dipsa bifurcata (Fallén, 1810) (Diptera: Lonchopteridae). I. Fluctuating seasonal selection moulds long-term coexistence

Heredity (2004)

Monica Niklasson Jürgen Tomiuk E. Davis Parker

Overwintering

10.1038/sj.hdy.6800480

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Citations (19)

PHENOTYPIC CONSEQUENCES OF PARTHENOGENESIS INCNEMIDOPHORUSLIZARDS. I. VARIABILITY IN PARTHENOGENETIC AND SEXUAL POPULATIONS

Evolution (1979)

E. Davis Parker

Parthenogenesis

10.1111/j.1558-5646.1979.tb04769.x

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Citations (52)

Assessing phylogenetic information to reveal uncertainty in historical data: An example using Goodeinae (Teleostei: Cyprinodontiformes: Goodeidae)

Molecular Phylogenetics and Evolution (2019)

E. Davis Parker Alex Dornburg Omár Domínguez‐Domínguez Kyle R. Piller

Cyprinodontiformes

Teleostei

Phylogenomics

Supermatrix

10.1016/j.ympev.2019.01.025

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Citations (8)

On the Relationship between Heterozygosity and DNA Content

The American Naturalist (1982)

E. Davis Parker Martin Kreitman

Genome size

10.1086/283951

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Citations (7)

Highland islands: assessing gene flow among populations of an aquatic highland endemic

Biological Journal of the Linnean Society (2023)

Kyle R. Piller E. Davis Parker Caleb D. McMahan Diego J. Elías Wilfredo A. Matamoros

Abstract A variety of hierarchical gene flow models have been proposed to explain the distribution of genetic variation in aquatic environments. These models, including the Stream Hierarchy (SH), Death Valley (DV), Headwater (HW), and Widespread Gene flow (WG) models, provide testable hypotheses that focus on the degree of within-basin or within-stream network connectivity and an organism’s dispersal abilities. We tested these models using Tlaloc hildebrandi (Profundulidae, Cyprinodontiformes), a freshwater fish endemic to the highlands of the Grijalva and Usumacinta River basins in southern Mexico. Data from ultraconserved elements (UCEs) showed that although T. hildebrandi was recovered as monophyletic, the sub-basins were not. We generated single nucleotide polymorphisms from the UCEs to analyse the data in a population genetic framework. These results differed between analyses such that two (STRUCTURE analysis) or three (DAPC analysis) genetic groupings were recovered. Overall, the results of this study provide support for the SH model. Some individuals from the Jataté sub-basin, however, conformed to the HW model, due to historical connections among headwater streams and rivers of the Jataté and Amarillo–Chenalhó clades/clusters. The greatest degree of gene flow has occurred from the Grijlava to the Usumacinta basins, two geographically proximate basins that have been hypothesized to have had previous connections.

Cyprinodontiformes

Monophyly

10.1093/biolinnean/blad137

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Citations (0)

Clonal Niche Structure in the Parthenogenetic Earthworm Octolasion tyrtaeum

The American Naturalist (1980)

John Jaenike E. Davis Parker Robert K. Selander

Clones of parthenogenetic species provide an opportunity to study the niches of individual genotypes. Octolasion tyrtaeum, a parthenogenetic earthworm, was collected in Tennessee, North Carolina, and New York in a variety of habitat types differing in soil pH, soil texture, and vegetation, which are important niche dimensions for earthworms. Eight genetically distinct clones were identified by starch-gel electrophoresis at 10 structural gene loci. Six of these clones were present in only a few collections, and therefore information on their potential niches is limited. The other two clones, which were widespread and abundant, are broad niched and apparently very similar ecologically. In fluctuating environments, selection favors "general purpose" genotypes, which are relatively insensitive to environmental changes, and which therefore are probably ecologically similar. Because soil and vegetation types form a mosaic pattern, only broad-niched clones can be widespread if dispersal occurs actively through the habitat. If the two dominant clones of O. tyrtaeum are nearly identical ecologically, as they appear to be, one might expect competitive exclusion or clonal "drift" where they occur together, whereas stable coexistence could result if they differ in their niches.

Parthenogenesis

Niche segregation

10.1086/283622

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Citations (101)

Environmental stress and reproductive mode in Mesaphorura macrochaeta (Tullbergiinae, Collembola)

Pedobiologia (2000)

Monica Niklasson Henning Petersen E. Davis Parker

Parthenogenesis

Environmental gradient

10.1078/s0031-4056(04)70065-7

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Citations (27)