b. Econfina River-estuary 



c. Fenholloway River-estuary 



B. Food-web structure of infaunal macroinvertebrates and epibenthic macroinver- 

 tebrates and fishes (freshwater and marine systems) 



1. Transformation of species-specific abundance and biomass data into trophic 

 units by feeding mode and trophic position in food web 



2. Comparative analysis among systems by feeding mode and trophic position in 

 food web (trophic unit) 



3. Analysis of long-term (10-12) changes of food web structure in different 

 systems (with and without effects of pollution and habitat alteration) 



4. Interaction of habitat features, primary production, and food web features 



C. Impact Analysis (freshwater, estuarine, marine) 



1. Pulp mill effluents (6 riverine and 5 estuarine systems) 



2. Storm-water runoff (Apalachicola River and Bay systems) 



3. Toxic substances (pesticides, heavy metals) (Flint River, Chipola River, 

 Hogtown Creek, Apalachicola River and Bay systems) 



4. Dredging and spoiling (Apalachicola River and Bay system) 



5. Forestry management (Apalachicola River and Bay system) 

 Experimental Ecology (Laboratory and Field) 



A. Validation of freshwater bioassays with field data at toxic waste sites along 

 two rivers (Chipola River, Hogtown Creek): infaunal macroinvertebrates, epi- 

 benthic fishes and macroinvertebrates (ongoing) 



B. Validation of bioassays using multi-species microcosms of soft-sediment, 

 marine infaunal macroinvertebrates (Apalachicola Bay system and the Yorktown 

 estuary, Virginia) (ongoing) 



C. Predator-prey interactions (soft-sediment areas and seagrass beds) (ongoing) 



1. Behavioral ecology 



2. Field effects of predation on prey assemblages 



3. Influence of predator-prey relationships on community structure under 

 varying environmental conditions (intra- and intersystem comparisons with 

 and without pollution variables) 



4. Relation of predator-prey relationships to community structure and food 

 web patterns 



Models : time-series changes of physical, chemical, and biological variables in 

 various aquatic systems (ongoing) 



Application of research findings to resource management and public education 



145 



