Tyler Kohler

Dr Tyler J. Kohler

(BSc Kansas State University; MSc University of Nebraska; PhD University of Colorado)

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I am broadly interested in how freshwater microbial communities are influenced by their biotic and abiotic environment, and using this information to make informed predictions about past, present, and future ecosystem structure and function. I am particularly interested in links between microbial composition and biogeochemical cycles, and how these relationships will evolve given global climate destabilization, land-use change, and ever-increasing socio-economic disparities.

Polar regions in particular are ideal places to disentangle these relationships, given their relatively pristine nature and trophic simplicity. Furthermore, rapidly accelerating environmental change and an increasing human presence makes research in these areas especially timely.


Recent Publications

Lamarche-Gagnon G, Wadham JL, Sherwood Lollar B, Arndt S, Fietzek P, Beaton AD, Tedstone AJ, Telling J, Bagshaw EA, Hawkings JR, Kohler TJ, Zarsky JD, Mowlem MC, Anesio AM, Stibal M (2019) Greenland melt drives continuous export of methane from the ice-sheet bed. Nature 565:73–77 doi: 10.1038/s41586-018-0800-0

Hawkings JR, Hatton JE, Hendry KR, de Souza GF, Wadham JL, Ivanovic R, Kohler TJ, Stibal M, Beaton A, Lamarche-Gagnon G, Tedstone A, Hain M, Bagshaw E, Pike J, Tranter M (2018) The global silicon cycle impacted by past ice sheets. Nature Communications 9:3210 doi: 10.1038/s41467-018-05689-1

Kohler TJ, Stanish LF, Liptzin D, Barrett JE, McKnight DM (2018) Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams. Limnology and Oceanography Letters 3:357–364 doi: 10.1002/lol2.10087

Žárský JD, Kohler TJ, Yde JC, Falteisek L, Lamarche-Gagnon G, Hawkings JR, Hatton JE, Stibal M (2018) Prokaryotic assemblages in suspended and subglacial sediments within a glacierized catchment on Qeqertarsuaq (Disko Island), west Greenland. FEMS Microbiology Ecology 94:fiy100 doi: 10.1093/femsec/fiy100

Kohler TJ, Žárský JD, Yde JC, Lamarche-Gagnon G, Hawkings JR, Tedstone AJ, Wadham JL, Box JE, Beaton AD, Stibal M (2017) Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. Geophysical Research Letters 44:6209–6217 doi: 10.1002/2017GL073219


Full list of publications here.


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