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Rachel Moran

Assistant Professor

Fax: 979-845-2891
Email:
rlmoran@tamu.edu

Lab:

Joined the Department in 2022

  • B.Sc., Biological Sciences, Northern Illinois University. 2011
  • M.Sc., Biological Sciences, Northern Illinois University. 2013
  • Ph.D., Ecology, Evolution, and Conservation Biology, University at Urbana-Champaign. 2019
  • Postdoctoral research, University of Minnesota. 2019-2022
  • Chicago Fellow, University of Chicago. 2022

The Moran Lab combines behavioral research with genomic technologies to understand the adaptive and mechanistic underpinnings of species diversification. We integrate experimental and computational approaches to test major evolutionary hypotheses in natural systems. Previous work has focused on two groups of North American stream fishes (darters and Mexican tetras).

Our overarching research goals include:

(1) Understanding how behavioral interactions between species (e.g., mating and fighting) promote the evolution of phenotypic and molecular divergence between and within species.

(2) Identifying features of genomic architecture that facilitate the evolution of reproductive barriers (i.e., traits that prevent hybrids from forming and/or reproducing) in the face of gene flow.

(3) Investigating the genetic basis of repeated evolution and determine how gene flow, de novo mutation, and standing genetic variation contribute to the convergent evolution of adaptive traits.

Biologists have long appreciated that mate choice and competition can promote diversification within species and lead to speciation. It is now clear that these interactions also commonly occur between species, with major ecological and evolutionary consequences. Selection to avoid interspecific mating (hybridization) can promote the evolution of mating traits through reproductive character displacement. Similarly, selection to avoid interspecific fighting can promote the evolution of competitive traits through agonistic character displacement. Character displacement can result in enhanced trait divergence between species in sympatry compared to allopatry and can play a key role in species diversification by favoring the evolution of behavioral isolation when closely related species co-occur. Recent work has demonstrated that character displacement may play an underappreciated role in driving species diversification at both micro- and macroevolutionary scales. Our work in darters asks how character displacement drives phenotypic and molecular evolution between and within species. To this end, we are interested in mating and aggressive interactions within and between species and patterns of genomic divergence among populations and species. New avenues of research in the lab include an investigation into the neurogenomic basis of species discrimination in these fishes using cutting edge genomic and functional tools.

Other ongoing work includes population genomic analyses off repeated adaption to caves in the Mexican tetra. In this species, ancestral surface populations have repeatedly adapted to harsh cave environments through evolution of the same suites traits, including enhancements to non-visual sensory systems, eye loss, albinism, and sleep loss. Our recent work has leveraged this system to investigate the ecological genomics of cave adaptation and to study the predictability and repeatability of molecular evolution.

  1. Moran, RL. Spitting on my sources: Depression, DNA, and the ambivalent historian. J Hist Behav Sci. 2022;58 (4):449-458. doi: 10.1002/jhbs.22219. PubMed PMID:35839130 .
  2. Moran, RL, Jaggard, JB, Roback, EY, Kenzior, A, Rohner, N, Kowalko, JE et al.. Hybridization underlies localized trait evolution in cavefish. iScience. 2022;25 (2):103778. doi: 10.1016/j.isci.2022.103778. PubMed PMID:35146393 PubMed Central PMC8819016.
  3. O'Gorman, M, Thakur, S, Imrie, G, Moran, RL, Choy, S, Sifuentes-Romero, I et al.. Pleiotropic function of the oca2 gene underlies the evolution of sleep loss and albinism in cavefish. Curr Biol. 2021;31 (16):3694-3701.e4. doi: 10.1016/j.cub.2021.06.077. PubMed PMID:34293332 .
  4. Chang, CH, Catchen, J, Moran, RL, Rivera-Colón, AG, Wang, YC, Fuller, RC et al.. Sequence Analysis and Ontogenetic Expression Patterns of Cone Opsin Genes in the Bluefin Killifish (Lucania goodei). J Hered. 2021;112 (4):357-366. doi: 10.1093/jhered/esab017. PubMed PMID:33837393 .
  5. Warren, WC, Boggs, TE, Borowsky, R, Carlson, BM, Ferrufino, E, Gross, JB et al.. A chromosome-level genome of Astyanax mexicanus surface fish for comparing population-specific genetic differences contributing to trait evolution. Nat Commun. 2021;12 (1):1447. doi: 10.1038/s41467-021-21733-z. PubMed PMID:33664263 PubMed Central PMC7933363.
  6. Reid, BN, Moran, RL, Kopack, CJ, Fitzpatrick, SW. Rapture-ready darters: Choice of reference genome and genotyping method (whole-genome or sequence capture) influence population genomic inference in Etheostoma. Mol Ecol Resour. 2021;21 (2):404-420. doi: 10.1111/1755-0998.13275. PubMed PMID:33058399 .
  7. Moran, RL, Devchand, M, Churilov, L, Warrillow, S, Trubiano, JA. The burden of antibiotic allergies in adults in an Australian intensive care unit: the BASIS study. Crit Care Resusc. 2019;21 (4):265-73. . PubMed PMID:31778633 .
  8. Moran, RL, Catchen, JM, Fuller, RC. Genomic Resources for Darters (Percidae: Etheostominae) Provide Insight into Postzygotic Barriers Implicated in Speciation. Mol Biol Evol. 2020;37 (3):711-729. doi: 10.1093/molbev/msz260. PubMed PMID:31688927 PubMed Central PMC7038671.
  9. Moran, RL, Zhou, M, Catchen, JM, Fuller, RC. Hybridization and postzygotic isolation promote reinforcement of male mating preferences in a diverse group of fishes with traditional sex roles. Ecol Evol. 2018;8 (18):9282-9294. doi: 10.1002/ece3.4434. PubMed PMID:30377500 PubMed Central PMC6194240.
  10. Moran, RL, Fuller, RC. Agonistic character displacement of genetically based male colour patterns across darters. Proc Biol Sci. 2018;285 (1884):. doi: 10.1098/rspb.2018.1248. PubMed PMID:30068684 PubMed Central PMC6111152.
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