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Research Interns Nicola Clegg (left) and Julie Golod (center) collect soil samples for denitrification analysis with the help of Research Assistant, Anna Knipps (right).

 

 

 

 

 

 

 

 

 

 

 

 

 

Interns Alissa Zimman and Rob Rossmanith sample soil as part of Alissa's project examining the effects of sod harvesting on soil properties.

 

 

 

 

 

 

 

 

Ranch interns and research assistants (fall 2003).  Pictured left to right: Michelle Ferree, Brooke Traynham, Jan Kokemor, Laura Calabrese, Brad Christoffersen. Sarah Harris.

 

Patrick J. Bohlen, Director

Associate Research Biologist

MacArthur Agro-ecology Research Center

300 Buck Island Ranch Road
Lake Placid, Florida 33852 USA
Phone: 863-699-0242    FAX: 863-699-2217  send e-mail

B.S. University of Michigan, 1983
M.S. Miami University, 1989
Ph.D. Ohio State University, 1994

Research Interests | Publications | Grants & Contracts | Faculty Appointments | Graduate Students | Research Interns | Professional Service | Updated CV

Research Interests  Current Research | Top

  • Nutrient (C, N, P) cycling in natural and managed ecosystems.

  • Ecological and economic sustainability of agroecosystems.

  • Provision of multiple ecosystem services from agricultural systems and landscapes.

  • Ecosystem dynamics in subtropical grazing lands.

  • Wetland ecology; nutrient cycling and productivity in wetland ecosystems.

  • Soil ecology and ecosystem ecology; role of soil and sediment fauna and microbial communities in nutrient cycling.

Faculty Appointments     Top

University of Florida, Soil and Water Science Dept., Courtesy Faculty, 1999-current.

Graduate Students  Top

Katherine Windes.  M.S. candidate. Biology.  Current.  University of Central Florida. (committee member).

Betsey Boughton.  PhD. candidate.  Current. University of Central Florida.  Biology Department (committee member/co-advisor).

Wolfgang Prein.  M.S. 2006.  FH Johanneum, Kapfenburg, Austria. (co-advisor). 

Jan Kokemor. M.S. 2005.  University of Bonn, Soil Science Department (co-advisor).

Carla Sperry. M.S., 2004.  University of Florida,  Soil and Water Sciences Dept. (committee member). 

Nicola Clegg. M.S. 2002.  Napier University, Biology of Water Resource Management Program (co-advisor).

Research Interns (21 total) Top

Annie Weiler, University of Minnesota, summer/fall 2006. Response of native (Panicum hemitomon) and introduced (Panicum repens) wetland grasses to nitrogen and phosphorus addition.

Rob Morrison, Kalamazoo College, summer/fall 2006.  Effects of vegetation on the abundance, diversity and composition of the invertebrate community in small, isolated wetlands on the cattle ranch.

Andrew Tweel, Colorado College, winter/spring 2006.  Influence of the rush, Juncus effusus, on soil phosphorus flux in grazed wetlands.

Jenna Smith, New College, summer/fall 2005.  Effects of Juncus effusus var. solutus on soil parameters in ranch wetlands of south Florida.

Wolfgang Prein, FH Johanneum, Kapfenberg, Austria, fall 2004. The role of ranch drainage ditches in phosphorus management of subtropical Florida.

Pedro Priante, Universidade Federal de Mato Grosso, Brazil, winter 2004. The influence of different grass species on fire ant mount morphology and nutrient characteristics in subtropical grasslands.

Jan Kokemor, University of Bonn, fall, 2003. Impact of cattle concentration areas on distribution of soil phosphorus.

Brook Traynham, Emory University, fall 2003.  Interactive effects of clipping and nutrient (nitrogen and phosphorus) availability on productivity and belowground responses of bahia grass (Paspalum notatum).

Brad Christoffersen, Southern Nazarene University, fall 2003. Assessing the impact of grazing activity and hydrologic fluctuations on denitrification in subtropical wetlands.

Jonathan Hogarh, Aalborg University, Denmark, winter 2003.  Groundwater nutrient concentration in subtropical pastures under different cattle stocking rates.

Laura Calabrese, Hobart and William Smith Colleges, spring 2003. Short-term effects of fire and grazing on subtropical wet prairies.

Alissa Zimman, Cornell College, summer/fall 2002.  Soil biology and sustainability of sod harvesting on south Florida cattle ranches.

Robin Rossmanith, Southern Illinois University, summer/fall 2002. Effects of grazing, land use and vegetation on soil invertebrate communities in subtropical grazing lands. 

Julie Conklin, Rutgers University, fall/winter 2002.  Aquatic macroinvertebrate communities in seasonal wetlands in improved and semi-native subtropical pastures.

Nicola Clegg, Napier University, summer 2001. Effect of land use on macroinvertebrate communities in drainage ditches of ranchlands in South Florida.

Julie Golod, Michigan State University, summer 2001. The impact of cattle grazing intensity on denitrification in poorly drained sandy soils.

Christine Edwards, University of Colorado, winter 2001. The influence of microclimate on vascular epiphyte distribution in live oak hammocks.

Wilhelmina Tsang, Brandeis University, summer 2000. Carbon storage and organic matter quality in sediments of seasonal wetlands influenced by grazing cattle.

Timothy Dickson, St. Olaf College, winter/spring 2000. Microbial nutrient dynamics in relation to cattle grazing and vegetation in subtropical rangelands.

Rachel Butzler, Penn State University, fall 1999. The effects of cattle ranching on algal productivity in seasonal wetlands.

Laura Spangler, Emory University, summer 1999. Influence of cattle ranching on nutrient characteristics of wetland sediments.

Professional Service  Top

 

Editorial boards

·        Applied Soil Ecology, 1996-2001.

·        Bulletin of Environmental Contamination and Toxicology, 1994-2000.

·        Ecology and Ecological Monographs (2001-2005).

·        Frontiers in Ecology and the Environment, 2007-current.

·        Rangeland Ecology and Management, 2008-2010.

·        Guest Editor, Applied Soil Ecology Special Issue on Biological Invasions, 2003-2004.

 

Symposium organizer

·        Agronomy Society of America, 2006.

·        Ecological Society of American Annual Meeting, 2006.

·        Southern Association of Agricultural Scientists, Orlando, FL, 2002.

·        Co-chair, 6th International Symposium on Earthworm Ecology, Vigo, Spain, 1998

 

National review panels

·        National Science Foundation Ecology Program, Spring 2000, 2002.

·        National Science Foundation Doctoral Dissertation Improvement Awards Program 1999.

·        USDA-NRI Managed Ecosystems Program, Winter 2007.

 

Proposal reviewer

·        National Science Foundation, Ecology/Ecosystem/LTREB Programs, 1999, 2001-6.

·        USDA-NRI Competitive Grants Program, 2005. 

·        Natural Sciences and Engineering Research Council of Canada, Discovery Grant Program Reviewer, 2004.

·        Marsden Fund, The Royal Society of New Zealand, 1998, 2000, 2001.

·        Natural Environmental Research Council Proposal, United Kingdom, 1998.

 

Offices held

·        Secretary, Soil Ecology Society, 2001-2003.

·        Secretary of the Soil Ecology Section of the Ecological Society of America, 1995-1997.

 

Committees and review teams

·        Wetlands Enhancement Advisory Committee, University of Florida, 2003-2005.

·        USDA-ARS Site Review Team, Subtropical Agricultural Research Station, Brooksville, FL, May 17-18, 2004.

·        Ecological Society of America, JSTOR Journal Selection Committee, 2003.

·        Symposium Organizer,

·        Heinz Center State of the Nation’s Ecosystems Project Reviewer, 2001.

·        Search Committee, USDA-ARS Subtropical Agricultural Research Station, Brooksville, FL, 2000.

·        Nominating Committee, International Soil Ecology Society, 1997.

 

Invited workshop participant, session chair

·        Invited Participant, USDA-ARS Rangeland, Pasture and Forages National Program Workshop, 1999.

·        Invited workshop moderator, Ecological Society of America Annual Meeting, 1996.

·        Contributed paper session chair, Ecological Society of America Annual Meeting, 1996.

 

Review for professional journals

·        Invited book reviews:  Applied Soil Ecology, Ecology, Soil Biology & Biochemistry.

·        Reviewer for:  Applied Soil Ecology, Biogeochemistry, Biological Invasions, Bulletin of Environmental Contamination and Toxicology, Canadian Journal of Forest Research, Ecology, Ecoscience, Environmental Engineering, Functional Ecology, Ecology Letters, Geoderma, Global Change Biology, Oecologia, Oikos, Rangeland Ecology and Management, Science, Soil Biology & Biochemistry, Soil Science Society of America Journal.

 

Other service

·        SEEDS Program Mentor, Ecological Society of America Annual Meeting, 1999.

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