PIs: J. Cotner and T. Johengen
Overview of Research Activities:
Results and Perspectives:
Hypothesis 1 - The recurrent coastal plume and/or resuspension of bottom sediments generates an increased inventory of total P and bioavailable P in the water column. This increased inventory is important to the development of the spring phytoplankton bloom.
Hypothesis 2-Heterotrophic bacteria function as "scavengers" of P in the coastal plume and maintain P availability in the water column.
Hypothesis 3- The inventory of TP and available P within the plume decreases as the plume ages, as a result of biotic incorporation and settling.
Hypothesis 4- The bioavailability of P on the particles is governed by (a) equilibrium with solid Ca-PO4 phases; (b) dissolution kinetics of CaPO4 phases; and/or (c) adsorption/desorption kinetics of PO4 on the Fe and Al oxides of the particles.
We have not addressed this hypothesis because our budget was cut.
Hypothesis 5- Water column P regeneration is more efficient during development of the recurrent coastal plume, minimizing losses to the sediments at this time.
There are approximately 40 principal investigators from 30 different universities, institutions, and governmental agencies collaborating on this project. Principal investigators interact through a series of annual workshops and collaborative research cruises. Workshops are held to coordinate research objectives, plan field activities, and share results. Daily interactions and information exchange are conducted through the project's web site and group mailing lists.
T. Johengen has served as the project coordinator for developing the field sampling program for the biological/chemical survey cruises and has served as the chief scientist for most of these cruises.
EEGLE-KITES collaborative cruise, June 2000. We worked with Sarah Green of Michigan Tech to examine in situ photo-oxidative versus biological degradation of organic matter in Lake Superior. Work related to this project was recently written about in the Minneapolis Star Tribune. .
This project is financially supported by the NSF CoOp and the NOAA COP programs. In addition, the U.S. EPA has contributed greatly to the project in terms of research vessel support and the funding of collaborative research projects that enhanced the scope of the EEGLE project.
Simba Blood, B.S. Department of Ecology, Evolution, and Behavior, University of Minnesota.