projects > computer simulation modeling of intermediate trophic levels for across trophic level systems simulation of the everglades/big cypress region > project summary
Project Summary Sheet
Fiscal Year 2007 Project Summary Report
Study Title: Computer Simulation Modeling of Intermediate Trophic Levels for Across Trophic Level Systems Simulation of the Everglades/Big Cypress Region
Overview & Objectives: This project has had the goal of developing models for key components of the Everglades landscape as part of the overall Across Trophic Level System Simulation. Past research has developed the basic model for freshwater fish biomass and a model of energy flow in the reptile and amphibian community. Current work has involved modeling and empirical studies on the snail kite, small mammals, and the oak toad. The objectives have been to understand the effects of hydrologic conditions on each of these taxa.
Status: No new PES money has been added to this project and existing funding has been extended through a no-cost extension to the December 31, 2007, and will be extended further into 2008. However, the University of Miami has received funding from the U. S. Fish and Wildlife Service to continue funding of the EVERKITE model. Small mammal research by Dr. Gaines will continue under other funding.
Snail kite modeling:
A postdoctoral student, Irene van der Stap, is being supported by USFWS to improve EVERKITE in several ways. DeAngelis is working with her under his support from FISC and GEPES funds. The following tasks are about 1/2 accomplished
Recent papers and presentations:
Mooij, W. M., J. Martin, W. M. Kitchens, and D. L. DeAngelis. 2007. Exploring the temporal effects of seasonal water availability on the snail kite of Florida. Pages 155-173, in Pulsed Resources and Wildlife Population Response: The Importance of Time. Editors: John Bissonette and Ilse Storch. Springer-Verlag Publisher.
Small mammal studies:
A report on the 11-year study is in preparation. Also, a Habitat Suitability Index for small mammals will be produced, but currently the statistical results are not strong enough to produce an HSI. Better statistical methods are being sought.
Fernandes, Miguel V., Donald DeAngelis, and Michael S. Gaines. 2007. The effects of tree island size and water depth on population patterns of the cotton rat (Sigmodon hispidus) and marsh rice rat (Oryzomys palustris) in the Florida Everglades. Poster at Ecological Society of America Annual Meeting, San Jose, CA
Gaines, M. S., D. L. DeAngelis, M. Fernandes, J. Warren, and H. Beck. 2006. Effects of Patch Size and Hydrology on Population Dynamics of Small Mammals in the Everglades. GEER Meeting, Lake Buena Vista, FL
Gaines, M. S. 2006. Effects of Habitat Patchiness on Small Mammal Populations in Everglades National Park. June 2006, University of Tokyo.
Everglades Landscape Modeling
Teh, S. Y., D. L. DeAngelis, L. S. L. Sternberg, F. R. Miralles-Wilhelm, and T. J. Smith. Disturbance events can cause regime shifts between vegetation types: A model study of mangroves and hardwood hammocks. (In press, Ecological Modelling.)
Sternberg, L. da S. L, S.-Y. Teh, S. Ewe, F. Miralles-Wilhelm, and D. L. DeAngelis. Competition of hardwood hammock and mangrove vegetation. (In Press, Ecosystems).
Liu, R., Z. Feng, H..Zhu, and D. L. DeAngelis. Bifurcation analysis of a plant herbivore model with toxin-determined functional response. (Submitted to Journal of Differential Equations)
Feng, Z., R. Liu, and D. L. DeAngelis. Plant-herbivore interactions mediated by plant toxicity. (Submitted to Theoretical Population Biology, revision requested.)
Ruan, S., A. Ardito, P. Ricciardi, and D. L. DeAngelis. Coexistence in competition models with density dependent mortality. (In press, CR Biologies)
This project is focused on improving on ATLSS's fish modeling capabilities and make these readily usable in South Florida. DeAngelis, under FISC and GEPES funding, is working with Joel Trexler (FIU) to accomplish this goal. The new model (GEFISH), supercedes ALFISH.
Beeck, P., D. L. DeAngelis, H. Doerner, and J. Borcherding. Piscivory in combination with bimodal size distribution in young-of-the-year Eurasian perch: an overlooked phenomenon? (Submitted to Oikos.)
Petersen, J. H., D. L. DeAngelis, and C. P. Paukert. Developing bioenergetics and life history models for rare and endangered species. (In press, Transactions of the American Fisheries Society.)
Planned Products: Work is continuing in the following directions:
Snail kite population modeling.
These will be produced by February, 2008
Small mammal studies
These have been delayed because of but are being worked on
Everglades Landscape modeling
Testing of GEFISH model and use in exploring hypotheses on what controls fish biomass as a function of hydroperiod and nutrients.
U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 04 September, 2013 @ 02:08 PM(TJE)