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University of Wyoming

Amy Krist

Associate Professor
Evolutionary Ecology


  • B.A. Biology, State University of New York at Potsdam
  • B.A. History, State University of New York at Potsdam
  • Ph.D. Ecology, Evolution, and Behavior, Indiana University

Current Courses

  • Invertebrate Zoology (Fall semesters)
  • Animal Biology (Spring Semesters)

Research Interests

  • I am an evolutionary ecologist focusing primarily on populations and communities. I seek to understand the biology of invasions by studying the causes of success of an invasive snail, Potamopyrgus, and the effects on trout introductions in alpine lakes. I also study ecological stoichiometry and have applied a stoichiometric perspective to understand the distribution of organismal ploidy level, parasite-host interactions, and biological invasions.

Current Graduate Students

  • Spencer Cruz, PhD student: ecological stoichiometry and functional trait diversity
  • Briante Najev (co-advised with Maurine Neiman), PhD student: the role of phosphorus limitation in the maintenance of ploidy polymorphism and sexual reproduction in a New Zealand freshwater snail
  • Elle Wimmer, MSc student: phenotypic plasticity in novel environments
  • Jordan Von Eggers (co-advised with Bryan Shuman), PhD student: using lake cores to reconstruct the effects of fish introduction, nutrient levels, and climate change in alpine lakes.

Past Graduate Students

  • Lindsey Boyle, MSc 2020: Effects of fish and nutrients on zooplankton assemblages in alpine lakes in the Wind River Range, WY.
  • Michele Larson- Ph.D. 2018: Invasion biology of Potamopyrgus antipodarum.
  • Daniel Greenwood - MSc 2018: Causes and consequences of the boom and bust of an invasive snail.
  • Tonya Anderson - MSc 2013: Life histories of Daphnia after the introduction of lake trout into Yellowstone Lake.
  • Brenna Hansen - MSc 2013: Behavioral and physiological mechanisms for coping with phosphorus limitation in invasive snails.
  • Charlotte Narr - MSc 2011: Effects of the stoichiometry of host food on parasite virulence and transmission; freshwater gastropod survey of Wyoming
  • Heather Thon - MSc 2011: Invasive snail halt the growth of native snails


  • Larson M.D., Levri E.P., Huzurbazar S.V,. Greenwood D.J., Wise K.L., Krist A.C. 2020 No evidence for a dilution effect of the non-native snail, Potamopyrgus antipodarum, on native snails.PLoS ONE 15(10): e0239762.
  • Larson, M.D. and Krist, A.C. 2020. Trematode prevalence and an invasive freshwater snail: fewer infections and parasites likely contribute to the success of an invasive snail. Biological Invasions22: 1279-1287, doi 10.1007/s10530-019-02179-3
  • Greenwood, D.J., R.O. Hall Jr., T.M. Tibbets, Krist, A.C 2020. A precipitous decline in an invasive snail population cannot be explained by a native predator. Biological Invasions 22: 363-378.
  • Narr C.F. Krist, A.C. 2020. Improving estimates of richness, habitat associations, and assemblage characteristics of freshwater gastropods. Aquatic Conservation: Marine and Freshwater Ecosystems 30: 131-143.
  • Larson, M.D., Dewey, J.C. Krist, A.C 2020. Invasive Potamopyrgus antipodarum (New Zealand mudsnails) and native snails differ in sensitivity to specific electrical conductivity and cations. Aquatic Ecology 54: 103-117.
  • Krist, A.C , L. Bankers, K. Larkin, M.D. Larson, D.J. Greenwood, M.A. Dyck, M. Neiman, 2017. Phosphorus availability in the source population influences response to dietary phosphorus quantity in a New Zealand freshwater snail. Oecologia 185: 595-605.
  • Neiman, M. and Krist, A.C . 2016. Sensitivity to dietary phosphorus limitation in native vs. invasive lineages of a New Zealand freshwater snail. Ecological Applications 26:2218-2224. DOI: 10.1002/eap.1372
  • Krist, A.C. , A.D.Kay, E. Scherber, K. Larkin, B.J. Brown, D. Lu, D.T. Warren, R. Riedl, M. Neiman. 2016. Evidence for extensive but variable nutrient limitation in New Zealand lakes. Evolutionary Ecology 30(5) 973-990. DOI 10.1007/s10682-016-9855-2
  • Hansen, B., T.M. Tibbets, Krist, A.C. 2016. Foraging differences between the native snail, Fossaria sp. and the invasive New Zealand mudsnail, (Potamopyrgus antipodarum) in response to phosphorus limitation. Aquatic Ecology 50:297. doi 10.1007/s10452-016-9578-z
  • Narr, C.F., Krist, A.C.. 2015. Host diet alters trematode replication and elemental composition. Freshwater Science 34(1): 81-91
  • Levri, E.P. Krist, A.C., R. Bilka, M.F. Dybdahl. 2014. Phenotypic plasticity of the introduced New Zealand mud snail, Potamopyrgus antipodarum compared to sympatric native snails. PLOS ONE 9(4): e93985
  • Krist, A.C., A.D. Kay, K. Larkin, M. Neiman. 2014. Response to phosphorus limitation varies among lake populations of the freshwater snail, Potamopyrgus antipodarum. PLOS ONE 9(1): e85845
  • Neiman, M., A.D. Kay, and A.C. Krist. 2013. Sensitivity to phosphorus limitation increases with ploidy level in a New Zealand snail. Evolution 67: 1511-1517.
  • Neiman, M., A.D. Kay, and A.C. Krist. 2013. Can resource costs of polyploidy provide an advantage to sex? Heredity 110: 152-159.
  • Krist, A.C. and Charles, C.C. 2012. The invasive New Zealand mudsnail, Potamopyrgus antipodarum, is an effective grazer of algae and altered the assemblage of diatoms more than native grazers. Hydrobiologia 694: 143-151.
  • Tibbets, T. M., Krist, A. C. , Hall, R.O. Jr., Riley, L. A. 2010. Phosphorus-mediated changes in life history traits of the invasive New Zealand mudsnail Potamopyrgus antipodarum. Oecologia 163:549-559.
  • Krist, A. C. . 2008. Phenotypic correlations reveal evidence for growth costs but not survival costs in a freshwater snail. Evolutionary Ecology Research 10: 1-9.
  • Krist, A. C. and Showsh, S.A. 2007. Experimental evolution of antibiotic resistance in bacteria. American Biology Teacher 69:218-221.
  • Krist, A. C. 2006. Prevalence of parasites does not predict age at first reproduction or reproductive output in the freshwater snail, Helisoma anceps . Evolutionary Ecology Research 8: 753-763.
  • Dybdahl, M.F., and , A. C. Krist . 2004. Genotypic versus condition effects on parasite-driven rare advantage. Journal of Evolutionary Biology 17: 967-973.
  • Krist, A. C ., J. Jokela, J. Wiehn, and C.M. Lively. 2004. Effects of host condition on susceptibility to infection, parasite development rate, and parasite transmission in a snail-trematode interaction. Journal of Evolutionary Biology 17: 33-40.
  • Krist, A. C. 2002. Crayfish induce a defensive shell shape in a freshwater snail. Invertebrate Biology 121:235--242.
  • Krist, A. C. 2001. Variation in fecundity among populations of snails is predicted by prevalence of castrating parasites. Evolutionary Ecology Research 3:191--197.
  • Krist, A. C., C. M. Lively, E. P. Levri, J.Jokela 2000. Spatial variation in susceptibility to infection in a snail-trematode interaction. Parasitology 121:395--401.
  • Krist, A. C. 2000. Effects of the digenean parasite Proterometra macrostoma on host morphology in the freshwater snail Elimia livescens. Journal of Parasitology 86: 262--267
  • Krist, A. C. and C. M. Lively. 1998. Experimental exposure of juvenile snails (Potamopyrgus antipodarum ) to infection by trematode larvae (Microphallus sp.): infectivity, fecundity compensation and growth. Oecologia 116: 575--582.
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