CESI Research Project 97-11

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Population Structure and Spatial Delineation of Consumer Communities
in the Everglades National Park
Joel C. Trexler & William F. Loftus

Female Eastern Mosquitofish

Photo Courtesy of Bill Loftus


The availability, abundance, and movement of aquatic prey species are of particular importance to understanding predator population dynamics in the Everglades. Population levels of aquatic species vary greatly between the wet and dry seasons but factors that influence those fluctuations required study, particularly the effects of water-management structures and operations.

Focusing on several small fishes, grass shrimp, and Florida gar, this study endeavored to answer some outstanding questions of importance to Everglades restoration. Specifically, the project used both radio telemetry and genetic surveys to monitor the movements of both predator and prey species. The results shed considerable light on the influences of nearby canals and water-management practices.


Please contact us for a copy of this report




Collins, T. M., Trexler, J. C., Nico, L.G., Rawlings, T. A. (2002). Genetic diversity in a morphologically conservative invasive taxon: multiple introductions of swamp eels to the southeastern United States. Conservation Biology, 16(4): 1024-1035.

Mcelroy, T. C., Kandl, K. L., Garcia, J., Trexler, J. C. (2003). Extinction-colonization dynamics structure genetic variation of spotted sunfish (Lepomis punctatus) in the Florida Everglades. Molecular Ecology, 12: 355-368


Contact the principal investigator directly with questions about this study.

CESI, Consumer Communities, Critical Ecosystem Studies Initiative, Everglades National Park, Fishes, Joel Trexler, William Loftus, Population, Movement, Canals, Water Management

Last updated: June 2, 2021

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