海洋国重 Evolutionary surprises in the future ocean: Long term adaptation of marine nitrogen-fixing cyanobacteria to high CO2 【Time】: 2015-7-17 (星期五) 10:00    【Count】: 1508   【Updated on】: 2015-7-13 【Venue】: Zhou Long Quan Building, A3-206 【Speaker】: David Hutchins, Professor of Marine and Environmental Biology 【Institution】: University of Southern California, USA 【Host】: Prof. Kunshan Gao   【Contact】: Vera Shi, vera_shiwei@xmu.edu.cn Abstract: The Hutchins lab works on how phytoplankton communities and the marine biogeochemistry of carbon, nutrients and trace metals may be affected by future environmental change.  One current project is using experimental evolution techniques to examine the effects of long-term selection by high CO2 on the physiology, gene expression and protein expression of a key player in the ocean nitrogen cycle, the N2-fixing cyanobacterium Trichodesmium.  This cyanobacterium adapts to high CO2 in a manner that is completely unprecedented in the microbial evolution literature, and does so based on a set of surprising and unexpected mechanisms.  These results will be discussed in light of their implications for marine microbial evolution and the biogeochemical cycles of a rapidly changing ocean. _______________________________________________________________ Ten sample publications (out of 137 total). Current ISI h-index: 43   Hutchins, D. A., Walworth, N., Webb, E.A., Saito, M. A., Moran, D., McIlvin, M. R., Gale, J., Johnson, C., and Fu, F.-X. (Accepted). Unique evolutionary response irreversibly elevates N2 fixation in high CO2-selected Trichodesmium. Nature Communications. Bertrand, E.M., McCrow, J.P., Zheng, H., Moustafa, A., McQuaid, J., Delmont, T., Post, A., Sipler, R., Spackeen, J., Xu, K., Bronk, D., Hutchins, D.A., and Allen, A.E. (In press). Phytoplankton- bacterial interactions mediate micronutrient colimitation in the Southern Ocean. Proceedings of the National Academy of Sciences USA. Garcia, N.S., Fu, F.-X., Sedwick, P.N., and Hutchins, D.A. (2015). Iron deficiency increases growth and nitrogen fixation rates of phosphorus-deficient marine cyanobacteria. ISME Journal9: 238-245. doi:10.1038/ismej.2014.104. Xu, K., Fu, F.-X. and Hutchins, D.A. (2014). Comparative responses of two dominant Antarctic phytoplankton taxa to interactions between ocean acidification, warming, irradiance, and iron availability. Limnology and Oceanography 59: 919- 931. Hutchins, D.A., Fu, F.-X., Webb, E.A., Walworth N., and Tagliabue, A. (2013). Taxon-specific response of marine nitrogen fixers to elevated carbon dioxide concentrations. Nature Geoscience 6(9):790-795. doi:10.1038/ngeo1858 Capone D.G. and Hutchins D.A. (2013). The microbial biogeochemistry of coastal upwelling regimes in a changing ocean. Nature Geoscience6(9): 711-715.  doi:10.1038/ngeo1916 King, A.L., Sañudo-Wilhelmy, S.A., Leblanc, K., Hutchins, D.A., and Fu, F.-X.  (2011). CO2 and vitamin B12 interactions determine bioactive trace metal requirements of a subarctic Pacific diatom. ISME Journal 5(8): 1388-1396.DOI:10.1038/ismej.2010.211. Hutchins, D.A. (2011). Forecasting the rain ratio. Nature 476: 41-42. Beman, J.M., C.-E. Chow, A.L. King, Y. Feng, J.A. Fuhrman, A. Andersson, N.R. Bates, B. N. Popp, and D.A. Hutchins.  (2011). Global declines in oceanic nitrification rates as a consequence of ocean acidification. Proceedings of the National Academy of Sciences, USA.108: 208-213. Hutchins, D.A., Mulholland, M.R. and Fu, F.-X. (2009). Nutrient cycles and marine microbes in a CO2-enriched ocean. Oceanography 22: 128-145.   Professional activities - Associate Editor for Marine Climate Change and Ocean Acidification, Proceedings B of the Royal Society of the United Kingdom. October 2014- present. - Chairman, 1st Ocean Global Change Biology Gordon Research Conference. (July, 2014). - Lead PI and organizer,Evolution and Climate Change in the Ocean (ECCO) workshop, sponsored by NSF Biological Oceanography 2011.  - Invited member,Ocean Acidification Task Force, Ocean Research and Resources Advisory Panel, Consortium for Ocean Leadership, 2010- 2012. - Advisor for five Master’s and nine Ph.D. past graduates, including three Hispanic students as well as eleven undergraduates and two high school interns. - Frequent reviewer for Nature, Nature Climate Change, Nature Geoscience, Science, Limnology and Oceanography, Deep Sea Research, Journal of Phycology, NSF Chemical and Biological Oceanography, NSF Office of Polar Programs.