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Gregory John Ragland

TitleAssociate Professor
InstitutionUniversity of Colorado Denver - Denver Campus
DepartmentCLAS-Biology
Phone303/315-7673

    Collapse Bibliographic 
    Collapse selected publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    1. Lackey ACR, Deneen PM, Ragland GJ, Feder JL, Hahn DA, Powell THQ. Simulated climate warming causes asymmetric responses in insect life-history timing potentially disrupting a classic ecological speciation system. Ecol Lett. 2023 Aug; 26(8):1407-1418. PMID: 37340567.
      View in: PubMed
    2. McIntyre T, Andaloori L, Hood GR, Feder JL, Hahn DA, Ragland GJ, Toxopeus J. Cold tolerance and diapause within and across trophic levels: Endoparasitic wasps and their fly host have similar phenotypes. J Insect Physiol. 2023 04; 146:104501. PMID: 36921838.
      View in: PubMed
    3. Schebeck M, Schopf A, Ragland GJ, Stauffer C, Biedermann PHW. Evolutionary ecology of the bark beetles Ips typographus and Pityogenes chalcographus. Bull Entomol Res. 2023 Feb; 113(1):1-10. PMID: 36239260.
      View in: PubMed
    4. Freda PJ, Toxopeus J, Dowle EJ, Ali ZM, Heter N, Collier RL, Sower I, Tucker JC, Morgan TJ, Ragland GJ. Transcriptomic and functional genetic evidence for distinct ecophysiological responses across complex life cycle stages. J Exp Biol. 2022 06 01; 225(11). PMID: 35578907.
      View in: PubMed
    5. Calvert MB, Doellman MM, Feder JL, Hood GR, Meyers P, Egan SP, Powell THQ, Glover MM, Tait C, Schuler H, Berlocher SH, Smith JJ, Nosil P, Hahn DA, Ragland GJ. Genomically correlated trait combinations and antagonistic selection contributing to counterintuitive genetic patterns of adaptive diapause divergence in Rhagoletis flies. J Evol Biol. 2022 01; 35(1):146-163. PMID: 34670006.
      View in: PubMed
    6. Schebeck M, Dobart N, Ragland GJ, Schopf A, Stauffer C. Facultative and obligate diapause phenotypes in populations of the European spruce bark beetle Ips typographus. J Pest Sci (2004). 2022; 95(2):889-899. PMID: 35221845.
      View in: PubMed
    7. Inskeep KA, Doellman MM, Powell THQ, Berlocher SH, Seifert NR, Hood GR, Ragland GJ, Meyers PJ, Feder JL. Divergent diapause life history timing drives both allochronic speciation and reticulate hybridization in an adaptive radiation of Rhagoletis flies. Mol Ecol. 2022 08; 31(15):4031-4049. PMID: 33786930.
      View in: PubMed
    8. Toxopeus J, Gadey L, Andaloori L, Sanaei M, Ragland GJ. Costs of averting or prematurely terminating diapause associated with slow decline of metabolic rates at low temperature. Comp Biochem Physiol A Mol Integr Physiol. 2021 05; 255:110920. PMID: 33582264.
      View in: PubMed
    9. Dowle EJ, Powell THQ, Doellman MM, Meyers PJ, Calvert MB, Walden KKO, Robertson HM, Berlocher SH, Feder JL, Hahn DA, Ragland GJ. Genome-wide variation and transcriptional changes in diverse developmental processes underlie the rapid evolution of seasonal adaptation. Proc Natl Acad Sci U S A. 2020 09 22; 117(38):23960-23969. PMID: 32900926.
      View in: PubMed
    10. Powell THQ, Nguyen A, Xia Q, Feder JL, Ragland GJ, Hahn DA. A rapidly evolved shift in life-history timing during ecological speciation is driven by the transition between developmental phases. J Evol Biol. 2020 10; 33(10):1371-1386. PMID: 32649797.
      View in: PubMed
    11. Meyers PJ, Doellman MM, Ragland GJ, Hood GR, Egan SP, Powell THQ, Nosil P, Feder JL. Can the genomics of ecological speciation be predicted across the divergence continuum from host races to species? A case study in Rhagoletis. Philos Trans R Soc Lond B Biol Sci. 2020 08 31; 375(1806):20190534. PMID: 32654640.
      View in: PubMed
    12. Clark RM, Ragland GJ. Editorial overview: Tapping arthropod diversity to elaborate the genotype-to-phenotype map. Curr Opin Insect Sci. 2019 12; 36:v-viii. PMID: 31732447.
      View in: PubMed
    13. Bakovic V, Schuler H, Schebeck M, Feder JL, Stauffer C, Ragland GJ. Host plant-related genomic differentiation in the European cherry fruit fly, Rhagoletis cerasi. Mol Ecol. 2019 10; 28(20):4648-4666. PMID: 31495015.
      View in: PubMed
    14. Ragland GJ, Armbruster PA, Meuti ME. Evolutionary and functional genetics of insect diapause: a call for greater integration. Curr Opin Insect Sci. 2019 12; 36:74-81. PMID: 31539788.
      View in: PubMed
    15. Freda PJ, Ali ZM, Heter N, Ragland GJ, Morgan TJ. Stage-specific genotype-by-environment interactions for cold and heat hardiness in Drosophila melanogaster. Heredity (Edinb). 2019 10; 123(4):479-491. PMID: 31164731.
      View in: PubMed
    16. Schebeck M, Schuler H, Einramhof B, Avtzis DN, Dowle EJ, Faccoli M, Battisti A, Ragland GJ, Stauffer C, Bertheau C. The Apennines as a cryptic Pleistocene refugium of the bark beetle Pityogenes chalcographus (Coleoptera: Curculionidae). Biol J Linn Soc Lond. 2019 May 31; 127(1):24-33. PMID: 31186586.
      View in: PubMed
    17. Doellman MM, Egan SP, Ragland GJ, Meyers PJ, Hood GR, Powell THQ, Lazorchak P, Hahn DA, Berlocher SH, Nosil P, Feder JL. Standing geographic variation in eclosion time and the genomics of host race formation in Rhagoletis pomonella fruit flies. Ecol Evol. 2019 Jan; 9(1):393-409. PMID: 30680122.
      View in: PubMed
    18. Schebeck M, Dowle EJ, Schuler H, Avtzis DN, Bertheau C, Feder JL, Ragland GJ, Stauffer C. Pleistocene climate cycling and host plant association shaped the demographic history of the bark beetle Pityogenes chalcographus. Sci Rep. 2018 09 21; 8(1):14207. PMID: 30242185.
      View in: PubMed
    19. Everman ER, Freda PJ, Brown M, Schieferecke AJ, Ragland GJ, Morgan TJ. Ovary Development and Cold Tolerance of the Invasive Pest Drosophila suzukii (Matsumura) in the Central Plains of Kansas, United States. Environ Entomol. 2018 08 11; 47(4):1013-1023. PMID: 29846535.
      View in: PubMed
    20. Doellman MM, Ragland GJ, Hood GR, Meyers PJ, Egan SP, Powell THQ, Lazorchak P, Glover MM, Tait C, Schuler H, Hahn DA, Berlocher SH, Smith JJ, Nosil P, Feder JL. Genomic Differentiation during Speciation-with-Gene-Flow: Comparing Geographic and Host-Related Variation in Divergent Life History Adaptation in Rhagoletis pomonella. Genes (Basel). 2018 May 18; 9(5). PMID: 29783692.
      View in: PubMed
    21. Dowle EJ, Bracewell RR, Pfrender ME, Mock KE, Bentz BJ, Ragland GJ. Reproductive isolation and environmental adaptation shape the phylogeography of mountain pine beetle (Dendroctonus ponderosae). Mol Ecol. 2017 Nov; 26(21):6071-6084. PMID: 29116665.
      View in: PubMed
    22. Williams CM, Ragland GJ, Betini G, Buckley LB, Cheviron ZA, Donohue K, Hereford J, Humphries MM, Lisovski S, Marshall KE, Schmidt PS, Sheldon KS, Varpe ?, Visser ME. Understanding Evolutionary Impacts of Seasonality: An Introduction to the Symposium. Integr Comp Biol. 2017 11 01; 57(5):921-933. PMID: 29045649.
      View in: PubMed
    23. Freda PJ, Alex JT, Morgan TJ, Ragland GJ. Genetic Decoupling of Thermal Hardiness across Metamorphosis in Drosophila melanogaster. Integr Comp Biol. 2017 11 01; 57(5):999-1009. PMID: 29045669.
      View in: PubMed
    24. Schebeck M, Hansen EM, Schopf A, Ragland GJ, Stauffer C, Bentz BJ. Diapause and overwintering of two spruce bark beetle species. Physiol Entomol. 2017 09; 42(3):200-210. PMID: 28979060.
      View in: PubMed
    25. Ragland GJ, Doellman MM, Meyers PJ, Hood GR, Egan SP, Powell THQ, Hahn DA, Nosil P, Feder JL. A test of genomic modularity among life-history adaptations promoting speciation with gene flow. Mol Ecol. 2017 Aug; 26(15):3926-3942. PMID: 28500772.
      View in: PubMed
    26. Meyers PJ, Powell TH, Walden KK, Schieferecke AJ, Feder JL, Hahn DA, Robertson HM, Berlocher SH, Ragland GJ. Divergence of the diapause transcriptome in apple maggot flies: winter regulation and post-winter transcriptional repression. J Exp Biol. 2016 Sep 01; 219(Pt 17):2613-22. PMID: 27312473.
      View in: PubMed
    27. Egan SP, Ragland GJ, Assour L, Powell THQ, Hood GR, Emrich S, Nosil P, Feder JL. Experimental evidence of genome-wide impact of ecological selection during early stages of speciation-with-gene-flow. Ecol Lett. 2015 Aug; 18(8):817-825. PMID: 26077935.
      View in: PubMed
    28. Ragland GJ, Almskaar K, Vertacnik KL, Gough HM, Feder JL, Hahn DA, Schwarz D. Differences in performance and transcriptome-wide gene expression associated with Rhagoletis (Diptera: Tephritidae) larvae feeding in alternate host fruit environments. Mol Ecol. 2015 Jun; 24(11):2759-76. PMID: 25851077.
      View in: PubMed
    29. Teets NM, Peyton JT, Ragland GJ, Colinet H, Renault D, Hahn DA, Denlinger DL. Combined transcriptomic and metabolomic approach uncovers molecular mechanisms of cold tolerance in a temperate flesh fly. Physiol Genomics. 2012 Aug 01; 44(15):764-77. PMID: 22735925.
      View in: PubMed
    30. Reidenbach KR, Neafsey DE, Costantini C, Sagnon N, Simard F, Ragland GJ, Egan SP, Feder JL, Muskavitch MA, Besansky NJ. Patterns of genomic differentiation between ecologically differentiated M and S forms of Anopheles gambiae in West and Central Africa. Genome Biol Evol. 2012; 4(12):1202-12. PMID: 23132896.
      View in: PubMed
    31. Ragland GJ, Egan SP, Feder JL, Berlocher SH, Hahn DA. Developmental trajectories of gene expression reveal candidates for diapause termination: a key life-history transition in the apple maggot fly Rhagoletis pomonella. J Exp Biol. 2011 Dec 01; 214(Pt 23):3948-59. PMID: 22071185.
      View in: PubMed
    32. Ragland GJ, Denlinger DL, Hahn DA. Mechanisms of suspended animation are revealed by transcript profiling of diapause in the flesh fly. Proc Natl Acad Sci U S A. 2010 Aug 17; 107(33):14909-14. PMID: 20668242.
      View in: PubMed
    33. Schwarz D, Robertson HM, Feder JL, Varala K, Hudson ME, Ragland GJ, Hahn DA, Berlocher SH. Sympatric ecological speciation meets pyrosequencing: sampling the transcriptome of the apple maggot Rhagoletis pomonella. BMC Genomics. 2009 Dec 27; 10:633. PMID: 20035631.
      View in: PubMed
    34. Hahn DA, Ragland GJ, Shoemaker DD, Denlinger DL. Gene discovery using massively parallel pyrosequencing to develop ESTs for the flesh fly Sarcophaga crassipalpis. BMC Genomics. 2009 May 19; 10:234. PMID: 19454017.
      View in: PubMed
    35. Ragland GJ, Fuller J, Feder JL, Hahn DA. Biphasic metabolic rate trajectory of pupal diapause termination and post-diapause development in a tephritid fly. J Insect Physiol. 2009 Apr; 55(4):344-50. PMID: 19200436.
      View in: PubMed
    36. Kingsolver JG, Ragland GJ, Diamond SE. Evolution in a constant environment: thermal fluctuations and thermal sensitivity of laboratory and field populations of Manduca sexta. Evolution. 2009 Feb; 63(2):537-41. PMID: 19154355.
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    37. Ragland GJ, Kingsolver JG. Evolution of thermotolerance in seasonal environments: the effects of annual temperature variation and life-history timing in Wyeomyia smithii. Evolution. 2008 Jun; 62(6):1345-57. PMID: 18331458.
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    38. Ragland GJ, Kingsolver JG. Influence of seasonal timing on thermal ecology and thermal reaction norm evolution in Wyeomyia smithii. J Evol Biol. 2007 Nov; 20(6):2144-53. PMID: 17903189.
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    39. Kingsolver JG, Massie KR, Ragland GJ, Smith MH. Rapid population divergence in thermal reaction norms for an invading species: breaking the temperature-size rule. J Evol Biol. 2007 May; 20(3):892-900. PMID: 17465900.
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    40. Kingsolver JG, Massie KR, Shlichta JG, Smith MH, Ragland GJ, Gomulkiewicz R. Relating environmental variation to selection on reaction norms: an experimental test. Am Nat. 2007 Feb; 169(2):163-74. PMID: 17211801.
      View in: PubMed
    41. Kingsolver JG, Izem R, Ragland GJ. Plasticity of size and growth in fluctuating thermal environments: comparing reaction norms and performance curves. Integr Comp Biol. 2004 Dec; 44(6):450-60. PMID: 21676731.
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    42. Kingsolver JG, Ragland GJ, Shlichta JG. Quantitative genetics of continuous reaction norms: thermal sensitivity of caterpillar growth rates. Evolution. 2004 Jul; 58(7):1521-9. PMID: 15341154.
      View in: PubMed
    43. Ragland GJ, Carter PA. Genetic covariance structure of growth in the salamander Ambystoma macrodactylum. Heredity (Edinb). 2004 Jun; 92(6):569-78. PMID: 15114367.
      View in: PubMed
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