Our Team


Dr. Karl Havens

Director, Florida Sea Grant College Program Professor, Fisheries and Aquatic Sciences, Institute of Food and Agricultural Sciences, University of Florida

1984 Ph.D. Biology, West Virginia University; 1981 M.S. Biology, West Virginia University
Biology; 1979 B.A., State University of New York at Buffalo

Dr. Havens has over 30 years of experience in the fields of freshwater and estuary research, education and outreach, and scientific management of Florida ecosystems. He has published over 150 peer-reviewed journal articles, as well as books, book chapters, invited review papers and a wide range of articles for lay audiences.

Dr. Havens is an Associate Editor of Journal of Plankton Research, Associate Editor of Hydrobiologia, and a member of the editorial board of Nature Scientific Reports. He is a member of the Florida Oceans and Coastal Council and the Florida Oceans Alliance. Dr. Havens is leading the UF Oyster Recovery Team in evaluating optimal approaches to restore a sustainable oyster fishery to Apalachicola Bay.

Selected Publications:
Sharma, S. … Havens, K. … et al. 2015. A global database of lake surface temperatures collected by in situ and satellite methods from 1985-2009. Nature Scientific Data DOI: 10.1038/sdata.2015.8.

Aumen, N.G., K.E. Havens, G. Ronnie Best and Leonard Berry. 2015. Predicting ecological responses of the Florida Everglades to possible future climate scenarios. Environmental Management 55: 741-748.

Havens, K.E., J.R. Beaver and T.L. East. 2015. Inter-lake comparisons indicate that fish predation, rather than high temperature, is the major driver of summer decline in Daphnia and other changes among cladoceran zooplankton in subtropical Florida lakes. Hydrobiologia 750: 57-67.

Havens, K.E., R.M. Pinto-Coelho, M. Beklioflu, K.S. Christoffersen, E. Jeppesen, T.L. Lauridsen, A. Mazumder, G. Methot, B. Pinel-Alloul, U.N. Tavsonoglu, S. Erdogan and J. Vijverberg. 2015. Temperature effects on body size of freshwater crustacean zooplankton from Greenland to the tropics. Hydrobiologia 743: 27-25.

Smith, V.H., W.K. Dodds, K.E. Havens, D.E. Engstrom, H.W. Paerl, B. Moss and G.E. Likens. 2014. Cultural eutrophication of natural lakes in the United States is real and widespread. Limnology and Oceanography 59: 2217-2225.

Havens, K.E. and A.D. Steinman. 2014. Ecological responses of a large shallow lake (Lake Okeechobee, Florida) to climate change and future hydrologic regimes. Environmental Management DOI 10.1007/s00267-013-0189-3.

Havens, K.E. and J.R. Beaver. 2011. Body size versus taxonomy in relating crustacean zooplankton communities to water quality in lakes. Inland Waters, in press.

Moss, B., S. Kosten, M. Meerhoff, R.W. Batterbee, E. Jeppesen, N. Mazzeo, K. Havens, G. Lacerot, Z. Liu, L. De Meester, H. Paerl and M. Scheffer. 2011. Allied attack: climate change and eutrophication. Inland Waters, in press.

Havens, K.E. and J.R. Beaver. 2011. Composition, size and biomass of zooplankton in large productive Florida lakes. Hydrobiologia 668: 49-60.

Havens, K.E., J.R. Beaver, D.A. Cassamatta, T.L. East, R.T. James, P. McCormick, E.J. Phlips and A.J. Rodusky. 2011. Hurricane effects on the planktonic food web of a large subtropical lake. Journal of Plankton Research, doi 10.1093/plankt/fbr002.

James, R.T., K.E. Havens, P. McCormick, B. Jones and C. Ford, 2011. Water quality trends in shallow south Florida lakes and assessment of regional versus local forcing functions. Critical Reviews in Environmental Science and Technology 41: 576-607.

Havens, K.E. and J.R. Beaver. 2010. Microbial food webs and lake management. Lakeline, Summer 2010: 32-35. Taticchi, M. I., A.C. Elia, L. Battoe and K.E. Havens. 2009. First report about freshwater Bryozoa in Florida (Lake Apopka). Italian Journal of Zoology 76: 194–200. Conley, D.J., H.W. Paerl, R.W. Howarth, D.F. Boesch, S.P. Seitzinger, K.E. Havens, C. Lancelot and G.E. Likens.

2009. Controlling eutrophication: nitrogen and phosphorus. Science 323: 1014-1015. Havens, K.E., A.C. Elia, M.I. Tattichi and R. Fulton. 2009. Zooplankton-phytoplankton relationships in shallow subtropical vs. temperate lakes. Hydrobiologia 628: 165-175

James, R.T., K.E. Havens, G. Zhu and B. Qin. 2009. Comparative analysis of nutrients, chlorophyll and transparency in two large shallow lakes (Lake Taihu, P.R. China and Lake Okeechobee, USA). Hydorbiologia 627: 211-231.

Phlips, E.J., K.E. Havens and M.R.M. Lopes. 2008. Seasonal dynamics of phytoplankton in two Amazon flood plain lakes of varying hydrologic connectivity to the main river channel. Fundamental and Applied Limnology 172: 99- 109.

Havens, K.E. 2007. Cyanobacteria blooms: effects on aquatic ecosystems. Advances in Experimental Medicine and Biology 619: 745-759.

Havens, K.E., J.R. Beaver and T.L. East. 2007. Plankton biomass partitioning in a eutrophic subtropical lake: comparison with results from temperate lake ecosystems. Journal of Plankton Research 29: 1087-1097.

Havens, K.E., T.L. East and J.R. Beaver. 2007. Zooplankton response to extreme drought in a large subtropical lake. Hydrobiologia 589: 187-198.

Havens, K.E., K.R. Jin, N. Iricanin, and R.T. James. 2007. Phosphorus dynamics at multiple time scales in the pelagic zone of a large shallow lake in Florida, USA. Hydrobiologia 581: 25-42.

Ibelings, B.W. and K.E. Havens. 2007. Cyanobacterial toxins: a qualitative meta-analysis of concentrations, dosage and effects in freshwater, estuarine and marine biota. Advances in Experimental Medicine and Biology 619: 685- 744.

Johnson, S.G., M.S. Allen and K.E. Havens. 2007. A review of littoral vegetation, fisheries and wildlife responses to hydrologic variation at Lake Okeechobee. Wetlands 27: 110-126.

Engstrom, D.E., S.P. Schottler, P.R. Leavitt and K.E. Havens. 2006. A re-evaluation of the cultural eutrophication of Lake Okeechobee, Florida, using multi-proxy sediment records. Ecological Applications 16: 1194-1206.

Havens, K.E. and T.L. East. 2006. Plankton food web responses to experimental nutrient additions in a subtropical lake. TheScientificWorld Journal 6: 827-833.

Carlson, R.E. and K.E. Havens. 2005. Simple graphical methods for the interpretation of relationships between trophic state variables. Lake and Reservoir Management 21: 107-118.

Havens, K.E. and D.E. Gawlik. 2005. Lake Okeechobee conceptual ecosystem model. Wetlands 25: 908-925.

Havens, K.E., D. Fox, S. Gornak and C. Hanlon. 2005. Aquatic vegetation and largemouth bass population responses to water level variations in Lake Okeechobee, Florida (USA). Hydrobiologia 539: 225-237.