Information for LLO web page Oct 2007
Stephanie Guildford
Department of Biology and Large Lakes Observatory
University of Minnesota, Duluth
2205 5th St., Duluth, Minnesota, USA 55812-2401
Phone 218 726 8064 Fax 218 726 6979
Email sguildfo@d.umn.edu
Education
Ph.D.
M.Sc.
B.Sc.
Botany
Botany
Biology
University of Manitoba
University of Manitoba
Dalhousie University
1996
1985
1972
Research Interests
Phytoplankton and nutrient dynamics with a focus on the health and productivity of African and
North American great lakes
Courses taught
Biology 2801 General Ecology
Recent publications
Higgins, S.N., Malkin, S. Y., Howell, E. T., Guildford, S.J., Campbell, L., Hiriart-Baer, V.,
Hecky, R. E. 2007. An ecological review of Cladophora glomerata (Chlorophyta) in the
Laurentian Great Lakes. Accepted J. Phycology.
North, R.L, Guildford, S.J., Smith, R.E.H., Twiss, M.R., Kling, H.J. 2007. Nitrogen, phosphorus,
and iron colimitation of phytoplankton communities in the nearshore and offshore regions of
the African Great Lakes. Accepted. Verh. Internat. Verein. Limnol.
Gondwe, M.J., Guildford, S.J., Hecky, R.E. 2007. Sandy shore benthic N2-fixation in Lake
Malawi, Africa. Accepted. Verh. Internat. Verein. Limnol.
Gondwe, M. J., Guildford, S.J., Hecky. 2007. Planktonic nitrogen fixation in Lake Malawi/Nyasa.
In press. Hydrobiologia.
Guildford, S.J., Bootsma, H.A., Taylor, W.D., Hecky, R.E. 2007. High variability of
phytoplankton photosynthesis in response to environmental forcing in oligotrophic Lake
Malawi/Nyasa. J. Great Lakes Res. 33:170-185.
North, R.L., Guildford, S.J., Smith, R.E.H., Havens, S.M., Twiss, M.R. 2007. The effect of iron
on phosphorus and nitrogen bioavailability to phytoplankton communities in the eastern
basin of Lake Erie. Limnol. Oceanogr. 52: 315-328.
Depew, D.C., Smith, R.E.H. and Guildford, S.J. 2006. Production and respiration in Lake Erie
plankton communities. J. Great Lakes Res. 32:817-832.
Higgins, S.N., Hecky, R.E., Guildford, S.J.2006. Environmental controls of Cladophora growth
dynamics in eastern Lake Erie: application of the Cladophora growth model (CGM). J.
Great Lakes Res. 32:629-644.
Silsbe, G.M., Hecky, R.E., Guildford, S.J., Mugidde, R. 2006.Variability of chlorophyll a and
photosynthetic parameters in a nutrient saturated tropical great lake. Limnol. Oceanogr. 52:
2052-2063.
Depew, D.C., Guildford, S.J. and Smith, R.E.H. 2006. Nearshore-offshore comparison of
chlorophyll a (chl a), and phytoplankton production in the dreissenid-colonized eastern basin
of Lake Erie. Can. J. Fish. Res. Aquat. Sci. 63:1115-1129.
Guildford, S.J., Hecky, R.E., Smith, R.E.H., Taylor, W.D., Charlton, M.N., Barlow-Busch, L.,
North, R.L. 2005. Phytoplankton nutrient status in Lake Erie in 1997. J. Great Lakes Res.
31 Supplement 2. 72-88.
Smith, R.E.H., Hiriart, V.P., Higgins, S.N., Guildford, S.J. and Charlton, M.N. 2005. Planktonic
primary production in the offshore waters of dreissenid-infested Lake Erie in 1997. J. Great
Lakes Res. 31 Supplement 2 50-62.
Higgins, S.N., R.E. Hecky and S.J. Guildford. 2005. Modeling the growth, biomass, and tissue
phosphorus concentration of Cladophora glomerata in eastern Lake Erie: Model description
and field testing. J. Great Lakes Res. 31:439-455.
Higgins, S.N., Howell, E.T., Hecky, R.E., Guildford, S.J. and Smith, R.E.H. 2005. The wall of
green: the status of Cladophora glomerata on the northern shores of Lake Erie’s east basin,
1996-2002. J. Great Lakes Res. 31:547-563.
Hecky, R.E., Smith, R.E.H., Barton, D.R., Guildford, S.J., Taylor, W.D., Howell, T.D., and
Charlton, M.N. 2004. The nearshore shunt: a consequence of ecosystem engineering by
dreissenids in the Laurentian Great Lakes. Can J. Fish Aquatic Sci. 61:1285-1293.
Guildford, S. J., R.E. Hecky, W.D. Taylor, R. Mugidde, H.A. Bootsma. 2003. Nutrient
enrichment experiments in tropical Great Lakes Malawi/Nyasa and Victoria. J. Great Lakes
Res. 29:(Supplement 2):89-106.
Baut, P., P.S. Ramlal, S.J. Guildford. 2002. The relationship between organic matter,
invertebrates and bacteria in the sediments of Lake Malawi. Aquat. Ecosystem Health and
Management. 5:307-313.
Hiriart, V.P., B.M. Greenberg, S.J. Guildford, R.E.H. Smith. 2002. Effects of ultraviolet B
radiation on rates and size distribution of primary production by Lake Erie phytoplankton.
Can. J. Fish. Res. Aquat. Sci. 59: 317-328.
Guildford, S.J., H.A. Bootsma, E.J. Fee, R.E. Hecky and G. Patterson. 2000. Phytoplankton
nutrient status and mean water column light intensity in Lakes Malawi and Superior.
Aquatic Ecosystem Health and Management. 3: 35-45.
Guildford, S.J. and R.E. Hecky. 2000 Total nitrogen, total phosphorus and nutrient limitation in
lakes and oceans: Is there a common relationship? Limnol. Oceanorgr. 45: 1213-1223.