Professional Education

  • Master of Science, Unlisted School (2011)
  • Doctor of Philosophy, University of California Davis (2018)
  • Bachelor of Arts, Lawrence University (2008)

Stanford Advisors

All Publications

  • Genetic structure in the endosymbiont Breviolum 'muscatinei' is correlated with geographical location, environment and host species PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES Cornwell, B. H., Hernandez, L. 2021; 288 (1946): 20202896


    Corals and cnidarians form symbioses with dinoflagellates across a wide range of habitats from the tropics to temperate zones. Notably, these partnerships create the foundation of coral reef ecosystems and are at risk of breaking down due to climate change. This symbiosis couples the fitness of the partners, where adaptations in one species can benefit the holobiont. However, the scales over which each partner can match their current-and future-environment are largely unknown. We investigated population genetic patterns of temperate anemones (Anthopleura spp.) and their endosymbiont Breviolum 'muscatinei', across an extensive geographical range to identify the spatial scales over which local adaptation is possible. Similar to previously published results, two solitary host species exhibited isolation by distance across hundreds of kilometres. However, symbionts exhibited genetic structure across multiple spatial scales, from geographical location to depth in the intertidal zone, and host species, suggesting that symbiont populations are more likely than their hosts to adaptively mitigate the impact of increasing temperatures.

    View details for DOI 10.1098/rspb.2020.2896

    View details for Web of Science ID 000627840400012

    View details for PubMedID 33715441

    View details for PubMedCentralID PMC7944108

  • Investing in Blue Natural Capital to Secure a Future for the Red Sea Ecosystems FRONTIERS IN MARINE SCIENCE Cziesielski, M. J., Duarte, C. M., Aalismail, N., Al-Hafedh, Y., Anton, A., Baalkhuyur, F., Baker, A. C., Balke, T., Baums, I. B., Berumen, M., Chalastani, V. I., Cornwell, B., Daffonchio, D., Diele, K., Farooq, E., Gattuso, J., He, S., Lovelock, C. E., McLeod, E., Macreadie, P. I., Marba, N., Martin, C., Muniz-Barreto, M., Kadinijappali, K. P., Prihartato, P., Rabaoui, L., Saderne, V., Schmidt-Roach, S., Suggett, D. J., Sweet, M., Statton, J., Teicher, S., Trevathan-Tackett, S. M., Joydas, T. V., Yahya, R., Aranda, M. 2021; 7
  • Gene flow in the anemone Anthopleura elegantissima limits signatures of local adaptation across an extensive geographic range. Molecular ecology Cornwell, B. H. 2020


    Species inhabiting marine environments face a wide range of environmental conditions that vary spatially across several orders of magnitude. The selective pressures that these conditions impose on marine organisms, in combination with potentially high rates of gene flow between distant populations, make it difficult to predict the extent to which these populations can locally adapt. Here, I identify how selection and gene flow influence the population genetic structure of the anemone Anthopleura elegantissima along the Pacific coast of North America. Isolation-by-distance is the dominant pattern across the range of this species, with a genetic break near Pt. Conception, CA. Furthermore, demographic modeling suggests that this species was historically confined to southerly latitudes before expanding northward. Outlier analyses identify 24 loci under selection (out of ~1,100), but the same analysis on simulated genetic data generated using the most likely demographic model erroneously identified the same number of loci under selection, if not more. Taken together, these results suggest that demographic processes are the dominant force shaping population genetic patterns in A. elegantissima along the Pacific coast of North America. I discuss these patterns in terms of the evolutionary history of A. elegantissima, the potential for local adaptation, and their consequences with respect to interactions with the endosymbiont Breviolum muscatinei across their geographic range.

    View details for DOI 10.1111/mec.15506

    View details for PubMedID 32525589