John E. Hobbie
Tel: 508-289-7470 | Fax: 508-457-1548
Ph.D., Indiana University, 1962
M.A., University of California, 1959
B.A., Dartmouth College, 1957
Links: Hobbie CV 2012
My research as an aquatic ecologist has attempted to identify the factors controlling decomposition and productivity within aquatic Ecosystems. I am primarily interested in the role natural assemblages of microbes play in ecosystems. I began studying this problem over 30 years ago in Swedish lakes, where I developed and applied methods for measuring the kinetics of uptake of organic compounds by bacteria using radiolabelled substrates. I later developed methods for measuring the mineralization of organic compounds to CO2, and visualizing and enumerating bacteria present in natural water samples using DNA specific stains (acridine orange and DAPI). The development of molecular biology has allowed us to put specific names on bacteria found in nature and we are attempting to determine what species are present and active seasonally. I also look at larger systems in estuaries and arctic tundra lakes where we have a 20-year data set. The combination of observations and experimental manipulations carried out over many years have proven a valuable tool for understanding ecological processes.
Hobbie, J. E., and E. A. Hobbie. 2012. Amino acid cycling in plankton and soil microbes studied with radioisotopes: measured amino acids in soil do not reflect bioavailability. Biogeochemistry 107:339 - 360.
Bowen, J.L., B.B. Ward, H.G. Morrison, J.E. Hobbie, I. Valiela, L.A. Deegan, M.L.Sogin. 2011. Microbial community composition in sediments resists perturbation by nutrient enrichment. ISME J. 2011 5(9):1540-1548. doi: 10.1038/ismej.2011.22.
Lougheed, V.L. M.G. Butler, D.C. McEwen, J.E. Hobbie. 2011. Changes in tundra pond limnology: re-sampling Alaskan ponds after 40 years. Ambio. 40(6):589-99.