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Project Summary Sheet

U.S Geological Survey, South Florida Ecosystem Program: Place-Based Studies

Project: Computer simulation modeling of intermediate trophic levels for Across Trophic Level Systems Simulation of the Everglades/Big Cypress Region

Web Sites: ATLSS.ORG

Location: The total system

Principal Investigator: Donald L. DeAngelis, Phone: 305-284-1690, e-mail: ddeangelis@umiami.ir.miami.edu

Project Personnel: Michael S. Gaines, Department of Biology, University of Miami., Phone: 305-284-3974, e-mail: m.gaines@miami.edu

Other Supporting Organizations:

Associated Projects: Component of ATLSS Program

Overview & Status: This project has had the goal of developing models four key components of the Everglades landscape as part of the overall Across Trophic Level System Simulation. There are four principal tasks within this project:

  • Develop models for two primary food bases; the functional group of small fishes, upon which many of the wading birds depend, and the main reptile and amphibian functional groups, which constitute much of the diet of the American alligator.
  • Develop models for the key wading bird species, particularly focusing on the effects of hydrology and fish availability on wading bird success.
  • Develop a model for the snail kite population of Florida.
  • Develop a model for the population of American crocodiles, along with supporting empirical studies on hatchling crocodiles.

Needs & Products: In all of the above components of this program, the emphasis was on developing spatially-explicit models, to allow analysis of how changes in the landscape hydrology would affect these biotic components. The models use available data, as well as data being collected as part of other CESI-funded projects. Some of the models have been applied to Restudy and ModWaters assessments. First versions of others will be available within the next year. Version 1 of a spatially-explicit individual-based model snail kite model has been completed and applied to Restudy and ModWaters assessments (January 2000). A model of fish biomass dynamics as a function of hydrology has been developed as part of this project, expanded to a landscape model by the University of Tennessee, and used in Restudy and ModWaters assessments. Model studies indicate that fish biomass increases significantly when hydroperiod is increased beyond a threshold of about nine months (June 1997).Version 1 of a wading bird model has been parameterized for the wood stork. This is now being used to study the effects of changed amounts, timing, and spatial distributions of water on model wood stork colonies situated in various locations in the Everglades (April 1999).A model of a subcomponent food web consisting of reptiles and amphibians has been developed and used to calculate biomasses and productivities of key herpetological functional groups (June 2000).

Application to Everglades Restoration :

  • Snail kite and fish landscape models have been used in C&SF Restudy assessments.
  • Snail kite and fish landscape models have been used in ModWaters Project design.
  • Wading bird, snail kite, and American crocodile models are critical for implementing the Multi-Species Recovery Plan.
  • Wading bird, snail kite, American alligator, and American crocodile are all Specific Performance Measures for the Everglades restoration plan.

Study Milestones

(Phase I & Phase II)

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

Familiarity

 

x

x

               

Design

   

x

x

             

Field Work

   

x

x

x

x

o

o

o

   

Data Analysis

   

x

x

x

x

o

o

o

   

Initial Reporting

   

x

x

             

Credibility Assurance

   

x

x

o

o

         

Results Published

   

x

x

x

x

o

o

o

   

Synthesis

     

x

x

x

o

o

o

   

Note: "x" indicates task completed, and "o" indicates task planned, but not completed


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Last updated: 24 April, 2014 @ 12:00 PM (KP)