Our guppy work is following three different lines of investigation. First, we investigate how natural selection, gene flow, and adaptation interact in natural populations. Second, we investigate how adaptive divergence leads to the evolution of reproductive isolation through mate choice experiments in the laboratory. Third, we examine host-parasite co-evolutionary dynamics in guppies, and the resulting consequences for community and ecosystem level processes.

Some Trinidad blog posts:  
Photographs  
Publications:
  1. ​Blondel, L., S. Klemet-N’Guessan, A.P. Hendry, and M.E. Scott. 2024. Parasite load, rather than parasite presence, decreases upstream movement in Trinidadian guppies Poecilia reticulata. Journal of Fish Biology 105:177-185. PDF
  2. Heckley, A.M., A.E. Pearce, K.M. Gotanda, A.P. Hendry, and K.B. Oke. 2022. Compiling forty years of guppy research to investigate the determinants of (non)parallel evolution. Journal of Evolutionary Biology 35:1414-1431. PDF​
  3. Heckley, A.M., J.J.P.R. de Lira, A.P. Hendry, and F. Pérez-Jvostov. 2022. How might Gyrodactylus parasitism modify trade-offs between female preference and susceptibility to predation in Trinidadian guppies? International Journal of Parasitology 52:459-467. PDF
  4. ​de Lira, J.J.P.R., Y. Yan, S. Levasseur, C.D. Kelly, and A.P. Hendry. 2021. The complex ecology of genitalia: gonopodium length and allometry in the Trinidadian guppy. Ecology and Evolution 11:4564-4576. PDF 
  5. Blondel, L., I.G. Paterson, P. Bentzen, and A.P. Hendry. 2021. Resistance and resilience of genetic and phenotypic diversity to “black swan” flood events: a retrospective analysis with historical samples of guppies. Molecular Ecology 30:1017-1028. PDF
  6. Blondel, L., S. Klemet-N’Guessan, M.E. Scott, and A.P. Hendry. 2020. Asymmetric isolation and the evolution of behaviors influencing dispersal: rheotaxis of guppies above waterfalls. Genes 11:180. PDF
  7. Blondel, L., L. Baillie, J. Quinton, J.B. Alemu, I. Paterson, A.P. Hendry, and P. Bentzen. 2019. Evidence for contemporary and historical gene flow between guppies in different watersheds – with a test for potential adaptive consequences. Ecology and Evolution. 9:4504-4517. PDF
  8. Dargent, F., L. Chen, G. Fussmann, C.K. Ghalambor, and A.P. Hendry. 2019. Female preference for novel males constrains the contemporary evolution of assortative mating in guppies. Behavioral Ecology 30:646-657. PDF
  9. Gotanda, K.M., A. Pack, C. Leblond, and A.P. Hendry. 2019. Do replicates of independent guppy lineages evolve similarly in a predator-free laboratory environment? Ecology and Evolution 9:36-51. PDF
  10. de Lira, J.J.P.R., F. Peréz-Jvostov, K.M. Gotanda, S. Kou-Giesbrecht, S.K. Pease, M. Jackson, S. Jersch, and A.P. Hendry. 2018. Testing for a whole-organism trade-off between natural and sexual selection: are the male guppies preferred by females more likely to get eaten by predators. Evolutionary Ecology Research 19:441-453. PDF
  11. Lighten, J., A.S.T. Papadopulos, R.S. Mohammed, B.J. Ward, I. Paterson, L. Baillie, I.R. Bradbury, A.P. Hendry, P. Bentzen, and C. van Oosterhout. 2017. Evolutionary genetics of immunological supertypes reveals two faces of the Red Queen. Nature Communications 8:1294. PDF 
  12. Pérez-Jvostov, F., A.P. Hendry, G.F. Fussmann, and M.E. Scott. 2017. Experimental assessment in nature of the ecological effects of a specialist parasite. Copeia 105:494-503. PDF 
  13. Gordon, S.P., A.P. Hendry, and D. Reznick. 2017. Predator-induced contemporary evolution, phenotypic plasticity, and the evolution of reaction norms in guppies. Copeia 105:514-522. PDF 
  14. Oke, K.B., G. Rolshausen, C. LeBlond, and A.P. Hendry. 2017. How parallel is parallel evolution? A comparative analysis in fishes. American Naturalist 190:1-16. PDF 
  15. Jacquin, L., C. Dybwad, G. Rolshausen, A.P. Hendry, and S.M. Reader. 2017. Evolutionary and immediate effects of crude-oil pollution: depression of exploratory behaviour across populations of Trinidadian guppies. Animal Cognition 20:97-108. PDF 
  16. Jacquin, L., S. M. Reader, A. Boniface, J. Mateluna, I. Patalas, F. Pérez-Jvostov, and A.P. Hendry. 2016. Parallel and non-parallel behavioural evolution in response to parasitism and predation in Trinidadian guppies. Journal of Evolutionary Biology 29:1406-1422. PDF 
  17. Pérez-Jvostov, F., A.P. Hendry, G.F. Fussmann, and M.E. Scott. 2016. An experimental test of antagonistic effects of competition and parasitism on host performance in semi-natural mesocosms. Oikos 125:790-796. PDF 
  18. Dargent, F., G. Rolshausen, A.P. Hendry, M. E. Scott, and G. F. Fussmann. 2016. Parting ways: parasite release in nature leads to sex-specific evolution of defense. Journal of Evolutionary Biology 29:23–34. PDF 
  19. Rolshausen, G., D.A.T. Phillip, D.M. Beckles, A. Akbari, S. Ghoshal, P.B. Hamilton, C.R. Tyler, A.G. Scarlett, I. Ramnarine, P. Bentzen, and A.P. Hendry. 2015. Do stressful conditions make adaptation difficult? Guppies in the oil-polluted environments of southern Trinidad. Evolutionary Applications 8:854–870. PDF 
  20. Pérez-Jvostov, F., A.P. Hendry, G.F. Fussmann, and M.E. Scott. 2015. Testing for host-parasite local adaptation: an experiment with Gyrodactylus ectoparasites and guppy hosts. International Journal of Parasitology 45:409–417. PDF 
  21. Gotanda, K.M., and A.P. Hendry. 2014. Using adaptive traits to consider potential consequences of temporal variation in selection: male guppy colour through time and space. Biological Journal of the Linnean Society 112:108-122. PDF 
  22. Dargent, F., M.E. Scott, A.P. Hendry, and G.F. Fussmann. 2013. Experimental elimination of parasites in nature leads to the evolution of increased resistance in hosts. Proceedings of the Royal Society B. Biological Sciences 280:20132371. PDF 
  23. Dargent, F., M. E. Scott, A. P. Hendry, and G. F. Fussmann. 2014. Experimental evolution of parasite resistance in wild guppies: natural and multifarious selection. Proceedings of the Royal Society B. Biological Sciences 281: 20141820. PDF
  24. Gotanda, K.M., L.C. DeLaire, J.A.M. Raeymaekers, F. Pérez-Jvostov, F. Dargent, P. Bentzen, M.E. Scott, G.F. Fussmann, and A.P. Hendry. 2013. Adding parasites to the guppy-predation story: insights from field surveys. Oecologia 172:155-166. PDF 
  25. Pérez-Jvostov, F., A.P. Hendry, G.F. Fussmann, and M.E. Scott. 2012. Are host-parasite interactions influenced by adaptation to predators? A test with guppies and Gyrodactylus in experimental stream channels. Oecologia 170:77-88. PDF 
  26. Millar, N.P., and A.P. Hendry. 2012. Population divergence of private and non-private signals in wild guppies. Environmental Biology of Fishes 94:513-525. PDF 
  27. Easty, L.K., A.K. Schwartz, S.P. Gordon, and A.P. Hendry. 2011. Does sexual selection evolve following introduction to new environments? Animal Behavior 82:1085-1095. PDF 
  28. McKellar, A.E., and A.P. Hendry. 2011. Environmental factors influencing adult sex ratio in Poecilia reticulata: laboratory experiments. Journal of Fish Biology 79:937-953. PDF 
  29. Weese, D.J., A.K. Schwartz, P. Bentzen, A.P. Hendry, and M.T. Kinnison. 2011. Eco-evolutionary effects on population recovery following catastrophic disturbance. Evolutionary Applications 4:354-366. PDF 
  30. Schwartz, A.K., D.J. Weese, P. Bentzen, M.T. Kinnison, and A.P. Hendry. 2010. Both geography and ecology contribute to mating isolation in guppies. PLoS ONE 5:e15659. PDF 
  31. Labonne, J., and A.P. Hendry. 2010. Natural selection can giveth and taketh away reproductive barriers: models of population divergence in guppies. American Naturalist 176:26-39. PDF 
  32. Weese, D., S. Gordon, A.P. Hendry, and M.T. Kinnison. 2010. Spatiotemporal variation in linear natural selection on body color in wild guppies (Poecilia reticulata). Evolution 64:1802-1815. PDF 
  33. Schwartz, A.K., and A.P. Hendry. 2010. Testing the influence of local forest canopy clearing on phenotypic variation in Trinidadian guppies. Functional Ecology 24:354–364. PDF 
  34. Gordon, S.P., D.N. Reznick, M.T. Kinnison, M.J. Bryant, D.J. Weese, K. Räsänen, N.P. Millar, and A.P. Hendry. 2009. Adaptive changes in life history and survival following a new guppy introduction. American Naturalist 174:34-45. PDF 
  35. McKellar, A.E., M.M. Turcotte, and A.P. Hendry. 2009. Environmental factors influencing adult sex ratio in Trinidadian guppies. Oecologia 159:735-745. PDF 
  36. Karim, N., S.P. Gordon, A.K. Schwartz, and A.P. Hendry. 2007. This is not déjà vu all over again: male guppy colour in a new experimental introduction. Journal of Evolutionary Biology 20:1339-1350. PDF 
  37. Schwartz, A.K., and A.P. Hendry. 2007. A test for the parallel co-evolution of male colour and female preference in Trinidadian guppies. Evolutionary Ecology Research 9:71-90. PDF 
  38. Schwartz, A.K., and A.P. Hendry. 2006. Sexual selection and the detection of ecological speciation. Evolutionary Ecology Research 8:399-413. PDF 
  39. Hendry, A.P., M.L. Kelly, M.T. Kinnison, and D.N. Reznick. 2006. Parallel evolution of the sexes? Effects of predation and habitat features on the size and shape of wild guppies. Journal of Evolutionary Biology 19:741-754. PDF 
  40. Crispo, E, P. Bentzen, D.N. Reznick, M.T. Kinnison, and A.P. Hendry. 2006. The relative influence of natural selection and geography on gene flow in guppies. Molecular Ecology. PDF 
  41. Millar, N.M., D.N. Reznick, M.T. Kinnison, and A.P. Hendry. 2006. Disentangling the selective factors that act on male coloration in wild guppies. Oikos 113:1-12. PDF 
  42. ​Patterson, I. G., E. Crispo, A. P. Hendry, M. T. Kinnison, and P. Bentzen. 2005. Characterization of tetranucleotide microsatellite markers in the guppy (Poecilia reticulata). Molecular Ecology Notes 5:269-271. (Primer note)