Dr. Casey Bryce

Junior Group Leader - Environmental Microbiology

Universität Tübingen
Angewandte Geowissenschaften
Hölderlinstraße 12
72076 Tübingen

Office: Room S531
Phone: +49-(0)7071-29-77560



My research focusses on how the physiology of microorganisms dictates their impact on the natural environment. Specifically I am interested in the broad diversity of microbes which use iron as an energy source, and how their different lifestyles influence the cycling of iron in soils, sediments and aquatic habitats. I am particularly interested in combining molecular biology (proteomics, genomics) with geochemistry to gain a holistic understanding of iron cycling in these systems.


Current research topics include:


I am always happy to hear from enthusiastic BSc. and MSc students who would like to join me in this research.

Academic History

2018 - present
Junior Group Leader in Environmental Microbiology

Lead scientist in the group of Prof. Dr. Andreas Kappler, University of Tübingen, Tübingen (Germany)

Postdoctoral Research Associate in Geomicrobiology

Group of Prof. Dr Andreas Kappler, University of Tübingen, Tübingen (Germany)

PhD student in Geomicrobiology and Astrobiology

Group of Prof. Charles Cockell, University of Edinburgh, Edinburgh (Scotland)

Bachelor of Science

BSc. Earth Science (Hons, First Class), University of Glasgow, Glasgow (Scotland)



C Bryce, N Blackwell, C Schmidt, Otte J, U Lueder, A Kappler. (2019) Microbial neutrophilic Fe(II) oxidation in a marine and freshwater sediment. Submitted.

M Schad, KO Konhauser, P Sanchez-Baracaldo, A Kappler, C Bryce (2019) How did the evolution of oxygenic photosynthesis influence the temporal and spatial development of the microbial iron cycle on ancient Earth? Submitted.             

C Peng, C Bryce, A Sundman, T Borch, A Kappler. (2019) Organic matter complexation promotes Fe(II) oxidation by the phototrophic Fe(II)-oxidizer Rhodopseudomonas palustris TIE-1. Submitted.

C Peng, C Bryce, A Sundman, A Kappler. (2019) Cryptic cycling of Fe(III)-organic matter complexes by phototrophic Fe(II)-oxidizing bacteria. Submitted.

In Press

T Samuels, C Bryce, H Landenmark, CM Loudon CM, N Nicholson, AH Stevens, CS Cockell. (2019) Microbial weathering of minerals and rocks in natural environments. AGU Books.

Bryce, A Kappler. (2019) Photoferrotrophy. Encyclopedia of Astrobiology: Living Edition. Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso (eds.) Springer.

Bryce, A Kappler. (2019) Anoxygenic Photosynthesis. Encyclopedia of Astrobiology: Living Edition. Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso (eds.) Springer.


C Bryce, M Franz-Wachtel, N Nalpas, J Miot, K Benzerara, JM Byrne, S Kleindienst, B Macek, A Kappler. (2018) Proteome response of a metabolically flexible anoxygenic phototroph to Fe(II) oxidation. Applied and Environmental Microbiology. 84 (16): e01166-18

C Bryce, N Blackwell, C Schmidt, J Otte, Y Huang, S Kleindienst, E Tomaszewski, M Schad, V Warter, C Peng, JM Byrne, A Kappler. (2018) Microbial anaerobic Fe(II) oxidation – ecology, mechanisms and environmental implications. Environmental Microbiology. 20(10): 3462-3483  

JM Byrne, M Schmidt, T Gauger, C Bryce, A Kappler (2018) Imaging Organic–Mineral Aggregates Formed by Fe(II)-Oxidizing Bacteria Using Helium Ion Microscopy. Environmental Science & Technology Letters. 5 (4):209-213

C Peng, A Sundman, C Bryce, C Catrouillet, T Borch, A Kappler (2018) Oxidation of Fe(II)–Organic Matter Complexes in the Presence of the Mixotrophic Nitrate-Reducing Fe(II)-Oxidizing Bacterium Acidovorax sp. BoFeN1. Environmental Science & Technology. 52 (10): 5753-5763O

C Cockell, B Biller, C Bryce, C Cousins, S Direito, D Forgan, M Fox-Powell, J Harrison, H Landenmark, S Nixon, SJ Payler, K Rice, T Samuels, P Schwendner, A Stevens, N Nicholson, J Wadsworth. (2018) The UK Centre for Astrobiology: A Virtual Astrobiology Centre. Accomplishments and Lessons Learned, 2011–2016. Astrobiology 2018 18:2, 224-243


A Kappler, C Bryce. (2017) Cryptic biogeochemical cycles: unravelling hidden redox reactions. Environ Microbiol. 19(3): 842-846


Bryce, T LeBihan, SF Martin, JP Harrison, T Bush, B Spears, A Moore, N Leys, B Byloos, CS Cockell (2016) Rock geochemistry induces stress and starvation responses in the bacterial proteome. Environmental Microbiology. 18(4): 1110-1121

CR Cousins , CS Cockell, and the Geobiology in Space Exploration Topical Team (2016) An ESA Roadmap for Geobiology in Space Exploration. Acta Astronautica 118, 286-295.

CS Cockell, T Bush, Bryce, S Direito, M Fox-Powell, JP Harrison, H Lammer, H Landenmark et al (2016) Habitability: A review. Astrobiology. 16


Bryce, G Horneck, E Rabbow, HGM Edwards, CS Cockell (2015) Impact shocked rocks as protective habitats on an anoxic early Earth. Int. J. Astrobiol. 14(1): 115-122 


JP de Vera et al (43 authors including C Bryce) (2012) Supporting Mars explorations: BIOMEX in Low Earth Orbit and further astrobiological studies on the Moon using Pancam technology. Planetary and Space Science. 74: 103-110