Thomas Fredrik Hansen

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Phone +47 22854521
Room 3317
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Visiting address Blindernveien 31 0371 Oslo
Postal address Postboks 1066 Blindern 0316 Oslo

Background

I am a theoretical evolutionary biologist who uses mathematical modeling as my chief research tool. I have background and interests in mathematical and statistical modeling within a wide range of topics including population genetics, population dynamics, and phylogenetic analysis.

Most of my current research is focused at the interface between evolutionary genetics and trait adaptation. Evolutionary theory contains a sophisticated and detailed account of how adaptations are produced and maintained by natural selection, but selection is based on available genetic variation and the 'variational' properties of organisms are less well understood. A major challenge for evolutionary biology is to understand the laws of organismal variation and how they relate to evolutionary change. Some of the questions I ask in my research are: 1) To what extent is the observed genetic variation of a character available to build adaptations, and to what extent is it constrained by conflicting selection pressures and pleiotropic interactions with other characters? 2) What are the properties of new mutations and how do these properties affect adaptation? 3) How do the effects of genes and mutations depend on the genetic background? 4) What determines the genetic architecture of a trait? 5) How do the variational properties of organisms evolve? 6) What makes a character evolvable and how does evolvability evolve? I pursue these questions in a number of different theoretical and empirical projects. Some of my ongoing projects are:

Modeling the evolution of genetic architecture

One approach to answer these questions is to study the evolution of genetic architecture through mathematical modeling. Much of this work is based on a general model of gene interactions that I developed in collaboration with Günter Wagner (Yale Univ.) and Joachim Hermisson (Univ. of Munich). Through simulation and analytical techniques we use this model to study the evolution of mutational properties and gene effects, as well as the evolution of the genotype-phenotype map itself. A related project uses the model as a statistical tool to estimate aspects of genetic architecture from various types of genetic data. I also work to develop models of gene-regulatory networks.

Variation and adaptation in Dalechampia blossoms

In collaboration with Scott Armbruster (Univ. of Portsmouth) and Christophe Pélabon (NTNU, Trondheim), I use quantitative genetic methods to study floral variation in Dalechampia vines. The 'blossoms' of these plants are functionally integrated inflorescences that secrete resin from a specialized gland to attract bees that use resins as nest-building materials. We seek to characterize the variability and evolvability of the blossoms and relate this to adaptive diversity among populations and species. Currently, we have an NSF grant through Florida State Univ. and Univ. of Alaska for this work.

The genetic architecture of Drosophila wing morphology

In collaboration with David Houle (Florida State Univ.), I study the genetic architecture of fruit-fly wing morphology through artificial selection and genetic experiments. Fly wings are interesting as they exhibit an extreme degree of stasis across species. We try to understand whether there are variational constraints that keep the wings stable. This work is funded by NSF and is being carried out at Florida State Univ.

Model-based phylogenetic comparative methods

In a long-standing project initiated in collaboration with Emilia Martins (Univ. of Indiana) and currently in collaboration with Steven Orzack (Freshpond Res. Inst.) and Jason Pienaar (Florida State Univ.), we develop statistical methods for analysis of comparative data based on explicit models of adaptive evolution. We seek to develop methods that are both statistically sound and make reasonable biological assumptions about adaptation and phylogenetic inertia.

Publications

  • Hansen, Thomas Fredrik; Bolstad, Geir Hysing & Tsuboi, Masahito (2021). Analyzing Disparity and Rates of Morphological Evolution with Model-Based Phylogenetic Comparative Methods. Systematic Biology. ISSN 1063-5157. doi: 10.1093/sysbio/syab079. Full text in Research Archive
  • Hansen, Thomas F. & Pélabon, Christophe (2021). Evolvability: A Quantitative-Genetics Perspective. Annual Review of Ecology, Evolution and Systematics. ISSN 1543-592X. 52, p. 153–175. doi: 10.1146/annurev-ecolsys-011121-021241.
  • Pelabon, Christophe; Albertsen, Elena; Le Rouzic, Arnaud; Firmat, Cyril; Bolstad, Geir Hysing & Armbruster, W. Scott [Show all 7 contributors for this article] (2021). Quantitative assessment of observed versus predicted responses to selection. Evolution. ISSN 0014-3820. 75(9), p. 2217–2236. doi: 10.1111/evo.14284. Full text in Research Archive
  • Albertsen, Elena; Opedal, Øystein Hjorthol; Bolstad, Geir Hysing; Pérez-Barrales, Rocío; Hansen, Thomas F & Pelabon, Christophe [Show all 7 contributors for this article] (2020). Using ecological context to interpret spatiotemporal variation in natural selection. Evolution. ISSN 0014-3820. p. 1–16. doi: 10.1111/evo.14136. Full text in Research Archive
  • Tsuboi, Masahito; Kopperud, Bjørn Tore; Syrowatka, Christine; Grabowski, Mark Walter; Voje, Kjetil L. & Pelabon, Christophe [Show all 7 contributors for this article] (2020). Measuring Complex Morphological Traits with 3D Photogrammetry: A Case Study with Deer Antlers. Evolutionary Biology. ISSN 0071-3260. 47, p. 175–186. doi: 10.1007/s11692-020-09496-9. Full text in Research Archive
  • Hansen, Thomas F; Solvin, Thomas Mørtvedt & Pavlicev, Mihaela (2019). Predicting evolutionary potential: A numerical test of evolvability measures. Evolution. ISSN 0014-3820. 73(4), p. 689–703. doi: 10.1111/evo.13705.
  • Toljagic, Olja; Voje, Kjetil L.; Matschiner, Michael; Liow, Lee Hsiang & Hansen, Thomas F (2018). Millions of Years Behind: Slow Adaptation of Ruminants to Grasslands. Systematic Biology. ISSN 1063-5157. 67(1), p. 145–157. doi: 10.1093/sysbio/syx059.
  • Houle, David; Bolstad, Geir Hysing; van der Linde, Kim & Hansen, Thomas F (2017). Mutation predicts 40 million years of fly wing evolution. Nature. ISSN 0028-0836. 548(7668), p. 447–450. doi: 10.1038/nature23473. Full text in Research Archive
  • Armbruster, W. Scott; Bolstad, Geir Hysing; Hansen, Thomas F; Keller, Barbara; Conti, Elena & Pelabon, Christophe (2017). The measure and mismeasure of reciprocity in heterostylous flowers. New Phytologist. ISSN 0028-646X. 215, p. 906–917. doi: 10.1111/nph.14604. Full text in Research Archive
  • Opedal, Øystein Hjorthol; Bolstad, Geir Hysing; Hansen, Thomas F; Armbruster, William Scott & Pelabon, Christophe (2017). The evolvability of herkogamy: Quantifying the evolutionary potential of a composite trait. Evolution. ISSN 0014-3820. 71(6), p. 1572–1586. doi: 10.1111/evo.13258.
  • Mayer, Christine & Hansen, Thomas F (2017). Evolvability and Robustness: A paradox restored. Journal of Theoretical Biology. ISSN 0022-5193. 430, p. 78–85. doi: 10.1016/j.jtbi.2017.07.004.
  • Hansen, Thomas F (2017). On the definition and measurement of fitness in finite populations. Journal of Theoretical Biology. ISSN 0022-5193. 419, p. 36–43. doi: 10.1016/j.jtbi.2016.12.024.
  • Falahati-Anbaran, Mohsen; Stenøien, Hans K.; Bolstad, Geir Hysing; Hansen, Thomas F; Pérez‐Barrales, Rocio & Armbruster, William Scott [Show all 7 contributors for this article] (2017). Novel microsatellite markers for Dalechampia scandens (Euphorbiaceae) and closely related taxa: application to studying a species complex. Plant Species Biology. ISSN 0913-557X. 32(2), p. 179–186. doi: 10.1111/1442-1984.12142. Full text in Research Archive
  • Hansen, Thomas F (2016). On bias and precision in metaanalysis: the error in the error. Journal of Evolutionary Biology. ISSN 1010-061X. 29, p. 1919–1921. doi: 10.1111/jeb.12947.
  • Malmstrøm, Martin; Matschiner, Michael; Tørresen, Ole Kristian; Star, Bastiaan; Snipen, Lars-Gustav & Hansen, Thomas F [Show all 13 contributors for this article] (2016). Evolution of the immune system influences speciation rates in teleost fishes. Nature Genetics. ISSN 1061-4036. 48(10), p. 1204–1210. doi: 10.1038/ng.3645. Full text in Research Archive
  • Grabowski, Mark Walter; Voje, Kjetil L. & Hansen, Thomas F (2016). Evolutionary modeling and correcting for observation error support a 3/5 brain-body allometry for primates. Journal of Human Evolution. ISSN 0047-2484. 94, p. 106–116. doi: 10.1016/j.jhevol.2016.03.001.
  • Hansen, Thomas F (2015). Evolutionary Constraints. In Losos, Jonathan (Eds.), Oxford Bibliographies in Evolutionary Biology. Oxford University Press. ISSN 9780199941728. p. 1–28. doi: 10.1093/OBO/9780199941728-0061.
  • Hansen, Thomas F (2015). Measuring gene interactions. Methods in molecular biology. ISSN 1064-3745. 1253, p. 115–143. doi: 10.1007/978-1-4939-2155-3_7.
  • Tarka, Maja; Bolstad, Geir Hysing; Wacker, Sebastian; Räsänen, Katja; Hansen, Thomas F & Pelabon, Christophe (2015). Did natural selection make the Dutch taller? A cautionary note on the importance of quantification in understanding evolution. Evolution. ISSN 0014-3820. 69(12), p. 3204–3206. doi: 10.1111/evo.12803.
  • Bolstad, Geir Hysing; Cassara, Jason A.; Marquez, Eladio; Hansen, Thomas F; van der Linde, Kim & Houle, David [Show all 7 contributors for this article] (2015). Complex constraints on allometry revealed by artificial selection on the wing of Drosophila melanogaster. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424. 112(43), p. 13284–13289. doi: 10.1073/pnas.1505357112. Full text in Research Archive
  • Le Rouzic, Arnaud; Hansen, Thomas F; Gosden, Thomas P. & Svensson, Erik I. (2015). Evolutionary time-series analysis reveals the signature of frequency-dependent selection on a female mating polymorphism. The American Naturalist. ISSN 0003-0147. 185(6), p. E182–E196. doi: 10.1086/680982. Full text in Research Archive
  • Hansen, Thomas F (2014). Use and Misuse of Comparative Methods in the Study of Adaptation. In László Zsolt, Garamszegi (Eds.), Modern Phylogenetic Comparative Methods and Their Application in Evolutionary Biology. Springer. ISSN 978-3-662-43550-2. p. 351–379. doi: 10.1007/978-3-662-43550-2_14.
  • Pelabon, Christophe; Firmat, Cyril Joel Patrick; Bolstad, Geir Hysing; Voje, Kjetil L.; Houle, David & Cassara, Jason [Show all 8 contributors for this article] (2014). Evolution of morphological allometry. Annals of the New York Academy of Sciences. ISSN 0077-8923. 1320(1), p. 58–75. doi: 10.1111/nyas.12470. Full text in Research Archive
  • Bolstad, Geir Hysing; Hansen, Thomas F; Pelabon, Christophe; Falahati-Anbaran, Mohsen; Perez-Barrales, Rocio & Armbruster, William Scott (2014). Genetic constraints predict evolutionary divergence in Dalechampia blossoms. Philosophical Transactions of the Royal Society of London. Biological Sciences. ISSN 0962-8436. 369(1649). doi: 10.1098/rstb.2013.0255.
  • Armbruster, William Scott; Pelabon, Christophe; Bolstad, Geir Hysing & Hansen, Thomas F (2014). Integrated phenotypes: Understanding trait covariation in plants and animals. Philosophical Transactions of the Royal Society of London. Biological Sciences. ISSN 0962-8436. 369(1649). doi: 10.1098/rstb.2013.0245.
  • Firmat, Cyril Joel Patrick; Lozano-Fernandez, I; Agusti, J; Bolstad, Geir Hysing; Cuenca-Bescos, G & Hansen, Thomas F [Show all 7 contributors for this article] (2014). Walk the line: 600 000 years of molar evolution constrained by allometry in the fossil rodent Mimomys savini. Philosophical Transactions of the Royal Society of London. Biological Sciences. ISSN 0962-8436. 369(1649). doi: 10.1098/rstb.2014.0057.
  • Voje, Kjetil L.; Hansen, Thomas F; Egset, Camilla Kalvatn; Bolstad, Geir Hysing & Pelabon, Christophe (2014). Allometric constraints and the evolution of allometry. Evolution. ISSN 0014-3820. 68(3), p. 866–885. doi: 10.1111/evo.12312.
  • Falahati-Anbaran, Mohsen; Stenøien, Hans K.; Pelabon, Christophe; Bolstad, Geir Hysing; Perez-Barrales, Rocio & Hansen, Thomas F [Show all 7 contributors for this article] (2013). Development of microsatellite markers for the neotropical vine Dalechampia scandens (Euphorbiaceae). American Journal of Botany. ISSN 0002-9122. 1(6). doi: 10.3732/apps.1200492.
  • Voje, Kjetil Lysne & Hansen, Thomas F (2013). Evolution of static allometries: adaptive change in allometric slopes of eye span in stalk-eyed flies. Evolution. ISSN 0014-3820. 67(2), p. 453–467. doi: 10.1111/j.1558-5646.2012.01777.x.
  • Hansen, Thomas F (2013). Why epistasis is important for selection and adaptation. Evolution. ISSN 0014-3820. 67(12), p. 3501–3511. doi: 10.1111/evo.12214.
  • Le Rouzic, Arnaud; Alvarez-Castro, Jose M. & Hansen, Thomas F (2013). The Evolution of Canalization and Evolvability in Stable and Fluctuating Environments. Evolutionary Biology. ISSN 0071-3260. 40(3), p. 317–340. doi: 10.1007/s11692-012-9218-z.
  • Perez-Barrales, Rocio; Bolstad, Geir Hysing; Pelabon, Christophe; Hansen, Thomas F & Armbruster, William Scott (2013). Pollinators and seed predators generate conflicting selection on Dalechampia blossoms. Oikos. ISSN 0030-1299. 122(10), p. 1411–1428. doi: 10.1111/j.1600-0706.2013.20780.x.
  • Voje, Kjetil Lysne; Mazzarella, Anna Virginia Black; Hansen, Thomas F; Østbye, Kjartan; Klepaker, Tom Olav & Bass, Arthur [Show all 10 contributors for this article] (2013). Adaptation and constraint in a stickleback radiation. Journal of Evolutionary Biology. ISSN 1010-061X. 26(11), p. 2396–2414. doi: 10.1111/jeb.12240.
  • Armbruster, W. Scott; Hansen, Thomas F; Bolstad, Geir Hysing; Perez-Barrales, Rocio & Pelabon, Christophe (2012). Adaptive accuracy and adaptive landscapes. In Svensson, Erik I. & Calsbeek, Ryan (Ed.), The adaptive landscape in evolutionary biology. Oxford University Press. ISSN 978-0-19-959537-2. p. 150–168. doi: 10.1093/acprof%3Aoso/9780199595372.003.0010.
  • Hansen, Thomas F (2012). Adaptive Landscapes and Macroevolutionary Dynamics. In Svensson, Erik I. & Calsbeek, Ryan (Ed.), The adaptive landscape in evolutionary biology. Oxford University Press. ISSN 978-0-19-959537-2. p. 205–226. doi: 10.1093/acprof%3Aoso/9780199595372.003.0013.
  • Bartoszek, Krzystof; Pienaar, Jason; Mostad, Petter; Andersson, Staffan & Hansen, Thomas F (2012). A phylogenetic comparative method for studying multivariate adaptation. Journal of Theoretical Biology. ISSN 0022-5193. 314, p. 204–215. doi: 10.1016/j.jtbi.2012.08.005.
  • Hansen, Thomas F & Bartoszek, Krzysztof (2012). Interpreting the Evolutionary Regression: The Interplay Between Observational and Biological Errors in Phylogenetic Comparative Studies. Systematic Biology. ISSN 1063-5157. 61(3), p. 413–425. doi: 10.1093/sysbio/syr122.
  • Escudero, Marcial; Hipp, Andrew L.; Hansen, Thomas F; Voje, Kjetil Lysne & Luceño, Modesto (2012). Selection and inertia in the evolution of holocentric chromosomes in sedges (Carex, Cyperaceae). New Phytologist. ISSN 0028-646X. 195(1), p. 237–247. doi: 10.1111/j.1469-8137.2012.04137.x.
  • Pelabon, Christophe; Thöne, Patrick; Hansen, Thomas F & Armbruster, William Scott (2012). Signal honesty and cost of pollinator rewards in Dalechampia scandens (Euphorbiaceae). Annals of Botany. ISSN 0305-7364. 109(7), p. 1331–1339. doi: 10.1093/aob/mcs091.
  • Egset, Camilla Kalvatn; Hansen, Thomas F; Le Rouzic, Arnaud; Bolstad, Geir Hysing; Rosenqvist, Gunilla & Pelabon, Christophe (2012). Artificial selection on allometry: change in elevation but not slope. Journal of Evolutionary Biology. ISSN 1010-061X. 25(5), p. 938–948. doi: 10.1111/j.1420-9101.2012.02487.x. Full text in Research Archive
  • Hansen, Thomas F & Voje, Kjetil Lysne (2011). DEVIATION FROM THE LINE OF LEAST RESISTANCE DOES NOT EXCLUDE GENETIC CONSTRAINTS: A COMMENT ON BERNER ET AL. (2010). Evolution. ISSN 0014-3820. 65(6), p. 1821–1822. doi: 10.1111/j.1558-5646.2011.01281.x.
  • Hansen, Thomas F (2011). Epigenetics: Adaptation or Contingency? Epigenetics: Linking genotype and phenotype in development and evolution. University of California Press. ISSN 9780520267091. p. 357–376.
  • Pavlicev, Mihaela & Hansen, Thomas F (2011). Genotype-Phenotype Maps Maximizing Evolvability: Modularity Revisited. Evolutionary Biology. ISSN 0071-3260. 38(4), p. 371–389. doi: 10.1007/s11692-011-9136-5.
  • Uyeda, Josef; Hansen, Thomas F; Arnold, Stevan J & Pienaar, Jason (2011). The million-year wait for macroevolutionary bursts. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424. 108(38), p. 15908–15913. doi: 10.1073/pnas.1014503108.
  • Le Rouzic, Arnaud; Østbye, Kjartan; Klepaker, Tom Olav; Hansen, Thomas F; Bernatchez, Louis & Schluter, Dolph [Show all 7 contributors for this article] (2011). Strong and consistent natural selection associated with armour reduction in sticklebacks. Molecular Ecology. ISSN 0962-1083. 20, p. 2483–2493. doi: 10.1111/j.1365-294X.2011.05071.x.
  • Le Rouzic, Arnaud; Houle, David & Hansen, Thomas F (2011). A modelling framework for the analysis of artificial-selection time series. Genetics Research. ISSN 0016-6723. 93(2), p. 155–173. doi: 10.1017/s0016672311000024.
  • Houle, David; Pelabon, Christophe; Wagner, Günter P. & Hansen, Thomas F (2011). Measurement and meaning in biology. The Quarterly review of biology. ISSN 0033-5770. 86(1), p. 3–34. doi: 10.1086/658408.
  • Pelabon, Christophe; Armbruster, William Scott & Hansen, Thomas F (2011). Experimental evidence for the Berg hypothesis: vegetative traits are more sensitive than pollination traits to environmental variation. Functional Ecology. ISSN 0269-8463. 25(1), p. 247–257. doi: 10.1111/j.1365-2435.2010.01770.x.
  • Labra, Antonieta; Voje, Kjetil Lysne; Seligmann, Hervé & Hansen, Thomas F (2010). Evolution of the third eye: a phylogenetic comparative study of parietal-eye size as an ecophysiological adaptation in Liolaemus lizards. Biological Journal of the Linnean Society. ISSN 0024-4066. 101(4), p. 870–883. doi: 10.1111/j.1095-8312.2010.01541.x.
  • Fierst, Janna & Hansen, Thomas F (2010). Genetic architecture and postzygotic reproductive isolation: Evolution of Bateson-Dobzhansky-Muller incompatibilities in a polygenic Model. Evolution. ISSN 0014-3820. 64(3), p. 675–693. doi: 10.1111/j.1558-5646.2009.00861.x.
  • Bolstad, Geir H; Armbruster, W. Scott; Pelabon, Christophe; Pérez-Barrales, R & Hansen, Thomas F (2010). Direct selection at the blossom level on floral reward by pollinators in a natural population of Dalechampia schottii: full-disclosure honesty? New Phytologist. ISSN 0028-646X. 188(2), p. 370–384. doi: 10.1111/j.1469-8137.2010.03429.x.
  • Le Rouzic, Arnaud; Skaug, Hans Julius & Hansen, Thomas F. (2010). Estimating genetic architectures from artificial-selection responses: A random-effect framework. Theoretical Population Biology. ISSN 0040-5809. 77(2), p. 119–130. doi: 10.1016/j.tpb.2009.12.003.
  • Pelabon, Christophe; Hansen, TF; Carter, Ashley J.R. & Houle, David (2010). EVOLUTION OF VARIATION AND VARIABILITY UNDER FLUCTUATING, STABILIZING, AND DISRUPTIVE SELECTION. Evolution. ISSN 0014-3820. 64(7), p. 1912–1925. doi: 10.1111/j.1558-5646.2010.00979.x.
  • Pavlicev, Mihaela; Le Rouzic, Arnaud; Cheverud, James; Günter P., Wagner & Hansen, Thomas F (2010). Directionality of Epistasis in a Murine Intercross Population. Genetics. ISSN 0016-6731. 185(4), p. 1489–1505. doi: 10.1534/genetics.110.118356.
  • Hansen, Thomas F & Houle, David (2009). Corrigendum. Journal of Evolutionary Biology. ISSN 1010-061X. 22(4), p. 913–915. doi: 10.1111/j.1420-9101.2009.01715.x.
  • Armbruster, William Scott; Pelabon, Christophe; Hansen, Thomas & Bolstad, Geir Hysing (2009). Macroevolutionary patterns of pollination accuracy: a comparison of three genera. New Phytologist. ISSN 0028-646X. 183(3), p. 600–617. doi: 10.1111/j.1469-8137.2009.02930.x.
  • Armbruster, William Scott; Hansen, TF; Pelabon, Christophe; Pérez-Barrales, R; Perez-Barrales, R & Maad, Johanne (2009). The adaptive accuracy of flowers: measurement and microevolutionary patterns. Annals of Botany. ISSN 0305-7364. 103(9), p. 1529–1545. doi: 10.1093/aob/mcp095.
  • Labra, Antonieta; Pienaar, Jason & Hansen, Thomas F (2009). Evolution of Thermal Physiology in Liolaemus Lizards: Adaptation, Phylogenetic Inertia, and Niche Tracking. The American Naturalist. ISSN 0003-0147. 174(2), p. 204–220. doi: 10.1086/600088.
  • Hansen, Thomas F; Pienaar, J & Orzack, SH (2008). A comparative method for studying adaptation to a randomly evolving environment. Evolution. ISSN 0014-3820. 62, p. 1965–1977. doi: 10.1111/j.1558-5646.2008.00412.x.
  • Hansen, Thomas F & Houle, D (2008). Measuring and comparing evolvability and constraint in multivariate characters. Journal of Evolutionary Biology. ISSN 1010-061X. 21, p. 1201–1219. doi: 10.1111/j.1420-9101.2008.01573.x.
  • Pelabon, Christophe; Pélabon, Christophe & Hansen, Thomas (2008). On the adaptive accuracy of directional asymmetry in insect wing size. Evolution. ISSN 0014-3820. 62(11), p. 2855–2867. doi: 10.1111/j.1558-5646.2008.00495.x.
  • Hansen, TF; Pelabon, Christophe & Armbruster, William Scott (2007). Comparing variational properties of homologous floral and vegetative characters in Dalechampia scandens: Testing the Berg hypothesis. Evolutionary Biology. ISSN 0071-3260. 34(1-2), p. 86–98. doi: 10.1007/s11692-007-9006-3.
  • Tomaiuolo, Maurizio; Hansen, Thomas F & Levitan, Don R. (2007). A theoretical investigation of sympatric evolution of temporal reproductive isolation as illustrated by marine broadcast spawners. Evolution. ISSN 0014-3820. 61, p. 2584–2595. doi: 10.1111/j.1558-5646.2007.00218.x.
  • Hansen, Thomas F; Pélabon, Christophe & Armbruster, W. Scott (2007). Comparing variational properties of homologous floral and vegetative characters in Dalechampia scandens: Testing the Berg hypothesis. Evolutionary Biology. ISSN 0071-3260. 34, p. 86–98.
  • Hansen, Thomas & Skjeldestad, Finn Egil (2007). Adolescents: Is there an association between knowledge of oral contraceptives and profession of provider? European journal of contraception & reproductive health care. ISSN 1362-5187. 12(4), p. 303–308. doi: 10.1080/13625180701475558.
  • Hansen, Thomas F (2006). The evolution of genetic architecture. Annual Review of Ecology and Systematics. ISSN 0066-4162. 37, p. 123–157.
  • Hansen, Thomas F (2006). The origins of robustness. Evolution. ISSN 0014-3820. 60, p. 418–420.
  • Pélabon, Christophe; Pelabon, Christophe; Hansen, Thomas F; Hansen, Thomas; Carter, Ashley & Houle, David (2006). Response of fluctuating and directional asymmetry to selection on wing shape in Drosophila melanogaster. Journal of Evolutionary Biology. ISSN 1010-061X. 19, p. 764–776. doi: 10.1111/j.1420-9101.2005.01054.x.
  • Pélabon, Christophe; Pelabon, Christophe; Hansen, Thomas; Carlson, Matthew & Armbruster, William Scott (2006). Patterns of asymmetry in the twining vine Dalechampia scandens (Euphorbiaceae): ontogenetic and hierarchical perspectives. New Phytologist. ISSN 0028-646X. 170, p. 65–74.
  • Hansen, Thomas; Carter, Ashley; Pélabon, Christophe & Pelabon, Christophe (2006). On adaptive accuracy and precision in natural populations. The American Naturalist. ISSN 0003-0147. 168(2), p. 168–181.
  • Hansen, Thomas F; Alvarez-Castro, Jose M.; Carter, Ashley J. R.; Hermisson, Joachim & Wagner, Günter P. (2006). Evolution of genetic architecture under directional selection. Evolution. ISSN 0014-3820. 60, p. 1523–1536.
  • Pelabon, Christophe; Carlson, ML; Hansen, TF & Armbruster, William Scott (2005). Effects of crossing distance on offspring fitness and developmental stability in Dalechampia scandens (Euphorbiaceae). American Journal of Botany. ISSN 0002-9122. 92(5), p. 842–851.
  • Carter, AJR; Hermisson, J & Hansen, Thomas F (2005). The role of epistatic gene interactions in the response to selection and the evolution of evolvability. Theoretical Population Biology. ISSN 0040-5809. 68(3), p. 179–196.
  • Pelabon, C; Carlson, ML; Hansen, Thomas F & Armbruster, WS (2005). Effects of crossing distance on offspring fitness and developmental stability in Dalechampia scandens (Euphorbiaceae). American Journal of Botany. ISSN 0002-9122. 92(5), p. 842–851.
  • Hansen, Thomas F & Orzack, SH (2005). Assessing current adaptation and phylogenetic inertia as explanations of trait evolution: The need for controlled comparisons. Evolution. ISSN 0014-3820. 59(10), p. 2063–2072.
  • Armbruster, William Scott; Pelabon, Christophe; Hansen, TF & Mulder, CPH (2004). Floral integration, modularity and accuracy: distinguishing complex adaptations from genetic constraints. In Pigliucci, Massimo & Preston, KA (Ed.), Phenotypic Integration: Studying the Ecology and Evolution of Complex Phenotypes. Oxford University Press. ISSN 0-19-516043-6. p. 23–49.

View all works in Cristin

  • Albertsen, Elena; H. Opedal, Øystein; Bolstad, Geir Hysing; Perez-Barrales, Rocio; Hansen, Thomas F & Pelabon, Christophe [Show all 7 contributors for this article] (2020). Using ecological context to interpret spatiotemperal variation in natural selection.
  • Bolstad, Geir Hysing; Albertsen, Elena; Perez-Barrales, Rocio; Opedal, Øystein Hjorthol; Armbruster, Scott & Pelabon, Christophe [Show all 7 contributors for this article] (2019). Benefits of using non-linear path analysis for estimating natural selection.
  • Mayer, Christine & Hansen, Thomas F (2017). Evovability and Robustness in Models of Pattern Formation.
  • Hansen, Thomas F (2017). A review of "Genes and Evolution. Current topics in developmental Biology, Volume 119, Edited by Virginie Orgogozo". The Quarterly review of biology. ISSN 0033-5770. 92, p. 479–480.
  • Svendsen, Ida Krogsgaard & Hansen, Thomas F (2016). Effects of climate change on biogeography.
  • Kopperud, Bjørn Tore & Hansen, Thomas F (2016). Artiodactyl brain size evolution.
  • Mayer, Christine & Hansen, Thomas F (2016). Resolving the relationship between evolvability and robustness using Boolean Genotype-Phenotype Maps.
  • Hansen, Thomas F (2016). Evolvability, Quantitative Genetics of. In Kliman, Richard M. (Eds.), Encyclopedia of Evolutionary Biology. Elsevier. ISSN 9780128000496. p. 83–89. doi: 10.1016/B978-0-12-800049-6.00042-1.
  • Hansen, Thomas F (2016). Epistasis. In de la Rosa, Laura Nuno & Müller, Gerd (Ed.), Evolutionary Developmental Biology. A Reference Guide. Springer Publishing Company. ISSN 978-3-319-33038-9. p. 1–14. doi: 10.1007/978-3-319-33038-9_53-1.
  • Albertsen, Elena; Pelabon, Christophe; Le Rouzic, Arnaud; Firmat, Cyril; Hansen, Thomas F & Bolstad, Geir Hysing [Show all 7 contributors for this article] (2016). Can we predict direct and correlated response to selection beyond the first generation?
  • Hansen, Thomas F (2015). Fitness. In Losos, Jonathan (Eds.), Oxford Bibliographies in Evolutionary Biology. Oxford University Press. ISSN 9780199941728.
  • Kopperud, Bjørn Tore & Hansen, Thomas F (2015). The ungulate brain: A comparative analysis.
  • Mayer, Christine & Hansen, Thomas F (2015). Genotype-Phenotype maps: Exploring evolvability and robustness by combining a multilinear framework with Boolean networks.
  • Mayer, Christine & Hansen, Thomas F (2015). Modeling Genotype-Phenotype Maps by combining a multilinear model with Boolean Networks.
  • Mayer, Christine & Hansen, Thomas F (2015). Genotype-Phenotype Maps: Exploring evolvability and robustness by combining a multilinear framework with Boolean networks.
  • Hansen, Thomas F (2015). Forståelse og misforståelse av arvelighet gjennom historien. In Hessen, Dag Olav; Lie, Thore & Stenseth, Nils Christian (Ed.), Mendels arv - Genetikkens æra. Gyldendal Norsk Forlag A/S. ISSN 978-82-05-45818-5. p. 45–79.
  • Tarka, Maja; Pelabon, Christophe; Hansen, Thomas F & Sæther, Bernt-Erik (2015). Intralocus sexual conflict and the evolution of sexual dimorphism.
  • Liow, Lee Hsiang & Hansen, Thomas F (2013). The Macroevolution Group: monkeys, horses, moss- and other animals (and plants).
  • Labra, Antonieta; Voje, Kjetil Lysne; Seligmann, Hervé & Hansen, Thomas F (2011). Erratum bij_1599 237..238 Evolution of the third eye: a phylogenetic comparative study of parietal-eye size as an ecophysiological adaptation in Liolaemus lizards. Biological Journal of the Linnean Society. ISSN 0024-4066. 102(1), p. 237–238. doi: 10.1111/j.1095-8312.2010.01599.x.
  • Pavlicev, Mihaela; Cheverud, James & Hansen, Thomas F (2010). The relationship between pleiotropy and evolvability. Integrative and Comparative Biology. ISSN 1540-7063. 50, p. E135–E135.
  • Hessen, Dag Olav; Stenseth, Nils Christian & Hansen, Thomas F (2010). Anmeldelser: Menneskets vei. [Internet]. Tidsskrift for Den norske legeforening.
  • Hansen, Thomas F (2009). Etter neodarwinismen: Hovedtrekk i evolusjonsteorien 1959-2009. In Hessen, Dag Olav; Lie, Thore & Stenseth, Nils Christian (Ed.), Darwin - Verden ble aldri den samme. Gyldendal Litteratur. ISSN 9-788205-390348. p. 83–132.
  • Hansen, Thomas F (2008). Macroevolutionary quantitative genetics? A comment on Polly (2008). Evolutionary Biology. ISSN 0071-3260. 35, p. 182–185. doi: 10.1007/s11692-008-9027-6.
  • Fierst, Janna & Hansen, Thomas F (2008). The Genetic Architecture of Reproductive Isolation.

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Published May 26, 2011 9:46 PM - Last modified Jan. 7, 2022 11:34 AM