Johanna Maltby
Johanna MaltbyAssistant Professor, Natural Science Department
PhD, GEOMAR Helmholtz Centre for Ocean Research Kiel and CAU Kiel
Diploma Biology, Christian-Albrechts-University Kiel and GEOMAR Helmholtz Centre for Ocean Research Kiel

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Mercy Hall 244  | 207-893-7906  |

Teaches Chemistry and Environmental courses including Principles of Chemistry I and II labs and recitations, Ecology and the Environmental Challenge, and Field Methods.

Scholarly interests – biogeochemistry in marine sediments, environmental controls on microbial processes, greenhouse gas production in marine/freshwater environments.

Johanna Maltby has supervised multiple undergraduates and advised them during laboratory work, field trips, data analysis, and thesis writing. Her main research interests include biogeochemical processes in aquatic systems; specifically, she focuses on the effect of oxygen and temperature on microbial greenhouse gas production. Her hobbies include enjoying Maine’s unique nature through biking and hiking.


Maltby, J., Steinle, L., Bange, H.W., Löscher, C.R., Fischer, M.A., Schmidt, M., Treude, T., Methanogenesis within the sulfate-reduction zone in seasonally hypoxic sediments from Eckernförde Bay, SW Baltic Sea, Biogeosciences, 15, 137–157, 2018

Steinle, L., Maltby, J., Treude, T., Kock, A., Bange, H.W., Engbersen, N., Zopfi, J., Lehmann, M.F., Niemann, H., Effects of low oxygen concentrations on aerobic methane oxidation in seasonally hypoxic coastal waters, Biogeosciences, 14, 1631-1645, 2017

Maltby, J., Sommer, S., Dale, A.W. & Treude, T., Microbial Methanogenesis in the sulfate-reducing zone of surface sediments traversing the Peruvian margin, Biogeosciences, 13, 283-299, 2016.

Treude, T., Krause, S., Maltby, J., Dale, A.W., Coffin, R., Hamdan, L. J., Sulfate reduction and methane oxidation activity below the sulfate-methane transition zone in Alaskan Beaufort Sea continental margin sediments: Implications for deep sulfur cycling, Geochimica et Cosmochimica Acta, 144, 217-237, 2014.

Excursions Trips/Research

2011-2012: Research cruises in the Gulf of Mexico to study the impact of oil on microbial processes in marine sediments (as part of the research project: ECOGIG= Ecosystem of Oil and Gas Inputs to the Gulf)

2012-2014: Multiple research cruises in the Baltic Sea to study the greenhouse gas production in coastal sediments

2013: Research cruise to upwelling region off Peru to study the impact of oxygen-minimum zones on benthic greenhouse gas production (as part of research project SFB754: biogeochemical processes in oxygen minimum zones)