Publications
First-author
* = shared first authorship
Monreal, P.J., Mellet, T., Grodner, B., Kunde, K., Cain, K.R., Hendrikx-Freitas, F., Hirzel, A., Kong, K.P., Bian, X., De Vera, J., John, S.G., White, A.E., Ribalet, F., Armbrust, E.V., & Bundy, R.M. Climate-driven shifts in upwelling reorganize biological iron cycling in the Equatorial Pacific HNLC, revealed by siderophores. (in prep).
Monreal, P.J., Savoca, M.S., Babcock-Adams, L. Moore, L.E., Ruacho, A., Hull, D., Pallin, L.J., Nichols, R.C., Calambokidis, J., Resing, J.A., Friedlaender, A.S., Goldbogen, J. & Bundy, R.M. Organic ligands in whale excrement support iron availability and reduce copper toxicity to the surface ocean. Communications Earth & Environment 6, 20 (2025). https://doi.org/10.1038/s43247-024-01965-9
Hoffman, C.L.*, Monreal, P.J.* Albers, J.B., Lough, A.J.M., Santoro, A.E., Mellett, T., Buck, K.N., Tagliabue, A., Lohan, M.C., Resing, J.A., & Bundy, R.M. Microbial strong organic-ligand production is tightly coupled to iron in hydrothermal plumes. Biogeosciences, 21, 22, 5233–5246 (2024). https://doi.org/10.5194/bg-21-5233-2024
Monreal, P.J., Kelly, C.L., Travis, N.M., & Casciotti, K.L. Identifying the sources and drivers of nitrous oxide accumulation in the eddy-influenced Eastern Tropical North Pacific oxygen-deficient zone. Global Biogeochemical Cycles, 36, e2022GB007310 (2022). https://doi.org/10.1029/2022GB007310
Co-author
Davis, J.E., Estes, E.R., Robinson, R.S., Monreal, P.J., Oldham, V.E., Laaker, E., Jenness, S.E., Kelly, R.P., Bell, K.E., Resing, J.A., & Bundy, R.M. The composition of organic manganese-binding ligands varies across river-ocean and oxic-anoxic interfaces in the Northern Gulf of Mexico. (in prep).
Dzurilla, K., Rizzo, G., Johnson, P., Monreal, P.J., Elavarasan, I., & Spiers, E. The Early Career Astrobiology Workforce Under Strain: Survey Evidence from 2025-2026. (in review). Preprint: https://doi.org/10.48550/arXiv.2608.06431
Mellett, T., Monreal, P.J., Kunde, K., Manck, L.E., Cain, K.R., Ribalet, F., Church, M.J., Armbrust, E.V., & Bundy, R.M. Iron availability modulates bacteria carbon cycling in the mesopelagic. Scientific Reports 16, 22360 (2026). https://doi.org/10.1038/s41598-026-49839-8
Conference Presentations
First-authored abstracts
Monreal, P.J., Davis, J.E., Moore, L.E., Hoffman, C.L., Jenness, S.E., Velling, S.J., Alian, O.M., Barrett, P.M., Baumberger, T., Buck, N.J., Walker, S.L., Weber, J.M., Barge, L.M., Bundy, R.M., & Resing, J.A. (2026). Hydrothermal contributions to planetary metal cycling on Earth as an analogue for understanding the habitability of icy moon oceans. Talk at 2026 Astrobiology Graduate Conference, Tucson, AZ.
Monreal, P.J., Velling, S.J., Çakar, M., Alian, O.M., Maltais, T.R., Weber, J.M., & Barge, L.M. (2026). Prebiotic organics enhance metal availability during serpentinization in Enceladus Ocean analogue experiments. Talk at 2026 Astrobiology Science Conference, Madison, WI.
Monreal, P.J., Barrett, P.M., Baumberger, T., Buck, N.J., Davis, J.E., Jenness, S.E., Walker, S.L., Herzfeld, E., van Dijken, G.L., Arrigo, K.R., Bundy, R.M., & Resing, J.A. (2026). Diffuse venting in the crater of a shallow seamount inputs stable, organically-complexed dissolved iron to the upper water column of the Australian-Antarctic Ridge bloom region. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Monreal, P.J., Barrett, P.M., Baumberger, T., Buck, N.J., Davis, J.E., Jenness, S.E., Walker, S.L., van Dijken, G.L., Arrigo, K.R., Bundy, R.M., & Resing, J.A. (2025). Uncovering near-surface hydrothermal iron sources to a massive phytoplankton bloom in the Southern Ocean. Poster at Chemical Oceanography Gordon Research Conference 2026, Manchester, NH.
Monreal, P.J., Graff van Creveld, S., Šulčius, S., Mellett, T., Cain, K.R., Arsenieff, L., Shopen-Gochev, C., Park, J., Lindell, D., Armbrust, E.V., Bundy, R.M. (2024). Microbial organic ligand production in response to labile and refractory Fe inputs in shipboard incubations from the Equatorial Pacific. Poster at Ocean Sciences Meeting 2024, New Orleans, LA.
Monreal, P.J., Savoca, M.S., Babcock-Adams, L., Moore, L.E., Ruacho, A., Hull, D., Pallin, L.J., Nichols, R.C., Calambokidis, J., Resing, J.A., Friedlaender, A.S., Goldbogen, J., & Bundy, R.M. (2024). The Scoop on Poop: Characterizing the organic speciation of metals excreted by whales to describe their bioavailability. Talk at UW Chemical Oceanography Seminar for Master’s Defense.
Monreal, P.J., Hoffman, C.L., Lough, A.J.M., Lang, S.Q., Mellett, T., Buck, K.N., Tagliabue, A., Lohan, M.C., Resing, J.A., & Bundy, R.M. (2023). The importance of siderophores on hydrothermal iron biogeochemistry across diverse vent fields. Talk at AGU Chapman Conference on Hydrothermal Circulation and Seawater Chemistry, Agros, Cyprus.
Monreal, P.J., and Graff van Creveld, S. (2023). Dust inputs, siderophore production and viral infection in the Pacific Ocean. Talk at Simons Collaboration on Ocean Processes and Ecology Meeting, NYC.
Monreal, P.J., Kelly, C.L., Travis, N.M., & Casciotti, K.L. (2022). Investigating spatial variability of N2O cycling in the Eastern Tropical North Pacific with a time-dependent model of N2O isotopocules. Talk at Ocean Sciences Meeting 2022, virtual.
Monreal, P.J., Hoffman, C.L., Moore, L.E., Lang, S.Q., Resing, J.A., & Bundy, R.M. (2021). The characterization of microbially produced iron-binding ligands across the Mid-Cayman Rise. Poster at GEOTRACES International Summer School, Bremerhaven, Germany.
Monreal, P.J., Hoffman, C.L., Moore, L.E., Lang, S.Q., Resing, J.A., & Bundy, R.M. (2021). The characterization of microbially produced iron-binding ligands across the Mid-Cayman Rise. Poster at American Geophysical Union Fall Meeting, New Orleans, LA.
Monreal, P.J., Hoffman, C.L., Moore, L.E., Lang, S.Q., Resing, J.A., & Bundy, R.M. (2021). Microbial Sources of Iron-Binding Ligands Across the Mid-Cayman Rise. Talk at NOAA/PMEL Student Symposium, virtual.
Monreal, P.J., Kelly, C.L., Travis, N.M., Baya, P.A., & Casciotti, K.L. (2020). Fine-scale spatial variation in N2O cycling in the Eastern Tropical North Pacific. Talk at Stanford Earth Undergraduate Research Symposium, virtual.
Monreal, P.J., Redondo, S.A., Francis, H., Moore, K., Zhao, M., & Hadly, E.A. (2019). Not all worms are created equal: what drives variation in mercury uptake at Jasper Ridge Biological Preserve? Poster at Stanford Biology Undergraduate Research Program Symposium, Stanford, CA.
Co-authored abstracts
Davis, J.E., Robinson, R.S., Estes, E.R., Oldham, V., Monreal, P.J., Laaker, E.M., Kelly, R.P., Resing, J.A., Faz, N.A., & Bundy, R.M. (2026). Characterization of manganese speciation and manganese-associated organic ligands in the seasonally hypoxic Gulf of Mexico. eLightning at Ocean Sciences Meeting 2026, Glasgow, UK.
Jenness, S.E., Monreal, P.J., Davis, J.E., Steffen, J., Chinni, V., Barrett, P.M., Buck, N.J., Walker, S.L., van Dijken, G.L., Arrigo, K.A., Baumberger, T., Fitzsimmons, J.N., Sherrell, R.M., Resing, J.A., & Bundy, R.M. (2026). Amphiphilic-type siderophores are widely present in the Southern Ocean and influence productivity and the stabilization of dissolved iron. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Arrigo, K.R., Resing, J.A., Bundy, R.M., Baumberger, T., Thomas, L.N., Barrett, P.M., van Dijken, G.L., Mills, M.M., Monreal, P.J., Ledesma, A.V., Davis, J.E., Niu, L.Y., Buck, N.J., & Walker, S. (2026). Highlights from the 2024-2025 Bloom Raiders Cruise to the Australian-Antarctic Ridge. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Baumberger, T., Barrett, P.M., Antriasian, A.M., Walker, S.L., Merle, S.G., Monreal, P.J., Buck, N.J., Davis, J.E., Herzfeld, E., Jerris, H.V., Arrigo, K.R., Resing, J.A., & Bundy, R.M. (2026). Helium isotope ratios and dissolved methane concentrations in a massive hydrothermal plume observed at the Australian-Antarctic Ridge in the Southern Ocean. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Barrett, P.M., Antriasian, A.M., Walker, S.L., Merle, S.G., Monreal, P.J., Buck, N.J., Davis, J.E., Herzfeld, E., Jerris, H.V., Arrigo, K.R., Resing, J.A., & Bundy, R.M. (2026). Iron partitioning and geochemical characteristics of particles from a diffuse vent field and eruptive plume along the Australian-Antarctic Ridge impacting near-surface waters. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Jerris, H.V., Barrett, P.M., Herzfeld, E., Stuhl, C., Monreal, P.J., Davis, J.E., Schine, C., Arrigo, K.R., Baumberger, T., Bundy, R.M., & Resing, J.A. (2026). Identifying manganese inputs to the Australian-Antarctic Ridge phytoplankton bloom during a suspected hydrothermal eruption. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Mills, M.M., Ledesma, A.V., Barrett, P.M., Lauer, J., Monreal, P.J., Buck, N.J., Davis, J.E., Niu, L.Y., Baumberger, T., Bundy, R.M., Resing, J.A., Thomas, L.N., & Arrigo, K.R. (2026). Surface phytoplankton communities over the Australian-Antarctic Ridge in relation to hydrothermal inputs. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Lauer, J., Mills, M.M., Monreal, P.J., Barrett, P.M., Buck, N.J., Davis, J.E., van Dijken, G.L., Jenness, S.E., Walker, S.L., Baumberger, T., Bundy, R.M., Resing, J.A., & Arrigo, K.R. (2026). Addition of hydrothermally influenced water relieves iron limitation in surface waters of the Australian-Antarctic Ridge. Poster at Ocean Sciences Meeting 2026, Glasgow, UK.
Ruacho, A., Monreal, P.J., Jenkins, B.D., Buck, K.N., Chappell, P.D., Burns, S., & Bundy, R.M. (2024). Copper ligand production from iron-limited diatoms. Poster at Ocean Sciences Meeting 2024, New Orleans, LA.
Jenness, S.E., Monreal, P.J., Savoca, M., Park, J.W., Steffen, J., Pallin, L.J., Friedlaender, A.S., Nichols, R.C., Fitzsimmons, J.N., Bu, K., Chinni, V., Sherrell, R.M., & Bundy, R.M. (2024). Evaluating the sources and identity of iron-binding organic ligands in the Southern Ocean. eLightning at Ocean Sciences Meeting 2024, New Orleans, LA.
Mellett, T., Monreal, P.J., Kunde, K.G.L., Cain, K.R., Armbrust, E.V., & Bundy, R.M. (2024). Iron-demand of heterotrophic bacteria in the mesopelagic along biogeochemical gradients in the Equatorial Pacific. Talk at Ocean Sciences Meeting 2024, New Orleans, LA.
Hoffman, C.L., Toner, B.M., Lohan, M.C., Lang, S.Q., Moore, L.E., Monreal, P.J., Tagliabue, A., Resing, J.A., & Bundy, R.M. (2022). Important role for microbially produced siderophores in the cycling of hydrothermal iron. Talk at Ocean Sciences Meeting 2022, virtual.
Resing, J.A., Buck, N.J., & Plume Raiders Team. (2022). Exploring dimensions of submarine volcanism and understanding how it impacts ocean chemistry and productivity. Talk at Ocean Sciences Meeting 2022, virtual.
Redondo, S.A., Monreal, P.J., Moore, K., Francis, H., Vargas, M., Hadly, I., Zhang, R., Mathieu, J., Fernandez, L., & Hadly, E.A. (2019). Which factors drive mercury uptake in non-native earthworms of California, USA? Poster at International Conference on Mercury as a Global Pollutant, Kraków, Poland.