Parameters characterizing the consumer communities at ten Everglades FCE study sites (SRS-2, 3, 4, and 5; TS/Ph-3, 6, 8, 9, 10, and 11) are measured at least two times per year. Parameters include density and standing crop estimates of fish and some macroinvertebrates (mostly decapod crustaceans). Samples are collected by 1-m2 throw trap or 5-m2 drop trap. Additional parameters include water depth at the time of sampling, floating mat volume, emergent plant stem density by species, and estimates of plant cover. Samples are collected in February and October each year. Additional samples are collected at several sites in April, July, and December. Once per year, researchers gather isotope information (C and N) on grass shrimp (Paleomonetes paludosa), mosquitofish (Gambusia holbrooki), amphipods (Hyella azteca), Seminole rams-horn snails (Planorbella duryi) and a fish that serves as a top carnivore at the study site (largemouth bass Micropterus salmoides; Florida gar Lepisosteus platyrhincus; or snook Centropomus undecimalis). On a periodic basis, key animal species are also sampled for tissue nutrients (C, N, P), for use in biogeochemical budgets and modeling.