Staff: Phytoplankton PI

Dr. Harold G. Marshall
Morgan Professor Emeritus and Eminent Scholar

Dr. Marshall is a freshwater/marine ecologist who specializes in the systematics and ecology of phytoplankton.  His present work emphasizes phytoplankton dynamics in the Chesapeake Bay and its tidal rivers, plus freshwater habitats in Virginia.  This includes the occurrence and study of bloom producing species, the presence and distribution of toxic algal species, and the long term trends associated with these populations.   This work also involves cell culture studies of algal life cycles, and the use of SEM and PCR analytical procedures for species verification.  He is the author of over 130 publications and has been active as a consultant to various private organizations, plus state and federal agencies, and is past President of the Virginia Academy of Science.

Selected Publications

Marshall, H.G., P. Hargraves, J. Burkholder, M. Parrow, M. Elbrachter, E. Allen, v. Knowlton, P. Rublee, W. Hynes, T. Egerton, D. Remington, K. Wyatt, A. Lewitus, and V. Henrich. 2006. Taxonomy of Pfiesteria (Dinophyceae). Harmful Algae, 5: 481-496 

Marshall, H.G., R. Lacouture, C. Buchanan, and J. Johnson 2006. Phytoplankton assemblages associated with water quality and salinity regions in Chesapeake Bay, U.S.A.  Estuarine, coastal, and Shelf Science, 69: 10-18

Marshall, H.G. and L. Burchardt.2005. Neuston: Its definition with a historical review regarding its concept and community structure.Archiv fur Hydrobiologie, 164(4): 429-448.

Marshall, H.G., L. Burchardt, and R. Lacouture.2005. A review of phytoplankton composition within Chesapeake Bay and its tidal estuaries.J. Plankton Research, 27(11): 1083-1102.

Buchanan, C., R.V. Lacouture, H.G. Marshall, M. Olson, and J. Johnson. 2005. Phytopolankton reference communities for Chesapeake Bay and its tidal tributaries. Estuaries, 28(1):138-159.

Burkholder, J., A. Gordon, P. Moeller, J. Law, K. Coyne, A. Lewitus, J. Ramsdale, H.G. Marshall, N. Deamer, S. Cary, J. Kempton, S. Morton, and P. Rublee. 2005. Demonstration of toxicity to fish and to mammalian cells by Pfiesteria species: Comparison of assay methods and strains. Proceedings of the National Academy of Science, 102(9):3471-3476.

Marshall, H.G., M. Lane, and K. Nesius. 2003. Long-term phytoplankton trends and related water quality trends in the lower Chesapeake Bay, Virginia, U.S.A. Environmental Monitoring and Assessment. 81:349-360

Marshall, H. 2003. Toxic algae: their presence and threat to Chesapeake Bay, U.S.A. In: Algae and Biological State of the Water. Acta Botanica Warmiae et Masuriae. Olsztyn. 3:51-60.

Marshall, H. 2002. Autotrophic picoplankton: Their presence and significance in marine and freshwater ecosystems. Virginia J. Science, 53:13-33.

Burkholder, J., H. Marshall, H. Glasgow, D. Seaborn, and N. Deamer-Melia. 2001. The standardized fish bioassay procedure for detedting and culturing actively toxicx Pfiesteria, used by two reference laboratories for Atlantic and Gulf Coast states. Environmental Health Perspectives, 109(5):745-756.

Marshall, H., A. Gordon, D. Seaborn, and W. Dunstan. 2000. Comparative culture and toxicity studies between the toxic dinoflagellate Pfiesteria piscicida and a morphologically similar cryptoperidiniopsoid dinoflagellate. J. Experimental Marine Biology and Ecology, 255:51-74.

Marshall, H.G. and K.K. Nesius. 1996. Phytoplankton composition in relation to primary production in Chesapeake Bay. Marine Biology. 125:611-617.

Marshall, H.G. 1995. autotrophic picoplankton distribution and abundance in Chesapeake Bay. Marine Nature. 4:33-42.

Marshall, H.G. 1994. Chesapeake Bay Phytoplankton: I. Composition. Proceedings Biological Society of Washington. 107:573-585.

Dodge, J.D. and H.G. Marshall. 1994. Biogeographic analysis of the armored planktonic dinoflagellate Ceratium in the North Atlantic and adjacent seas. Journal of Phycology. 30:905-922.

Total Publications by Dr. Harold Marshall (.pdf)