Title

Assessing Coral Reef Fish Population and Community Changes in Response to Marine Reserves in the Dry Tortugas, Florida, USA

Author Info

Jerald S. Ault, University of Miami
Steven G. Smith, University of Miami
James A. Bohnsack, NOAA Fisheries, Southeast Fisheries Science Center
Jiangang Luo, University of Miami
Natalia Zurcher, University of Miami
David B. McClellan, NOAA Fisheries, Southeast Fisheries Science Center
Tracy A. Ziegler, Florida Keys National Marine Sanctuary
David E. Hallac, Yellowstone Center for Resources
Matt Patterson, National Park Service, South Florida-Caribbean Network
Michael W. Feeley, NNational Park Service, South Florida-Caribbean Network
Benjamin I. Ruttenberg, California Polytechnic State University, San Luis ObispoFollow
John Hunt, Florida Fish and Wildlife Conservation Commission
Dan Kimball, National Park Service, Everglades/Dry Tortugas National Park
Billy Causey, Florida Keys National Marine Sanctuary

Recommended Citation

Postprint version. Published in Fisheries Research, Volume 144, July 1, 2013, pages 28-37.

The definitive version is available at https://doi.org/10.1016/j.fishres.2012.10.007.

Abstract

The efficacy of no-take marine reserves (NTMRs) to enhance and sustain regional coral reef fisheries was assessed in Dry Tortugas, Florida, through 9 annual fishery-independent research surveys spanning 2 years before and 10 years after NTMR implementation. A probabilistic sampling design produced precise estimates of population metrics of more than 250 exploited and non-target reef fishes. During the survey period more than 8100 research dives utilizing SCUBA Nitrox were optimally allocated using stratified random sampling. The survey domain covered 326 km², comprised of eight reef habitats in four management areas that offered different levels of resource protection: the Tortugas North Ecological Reserve (a NTMR), Dry Tortugas National Park (recreational angling only), Dry Tortugas National Park Research Natural Area (a NTMR), and southern Tortugas Bank (open to all types of fishing). Surveys detected significant changes in population occupancy, density, and abundance within management zones for a suite of exploited and non-target species. Increases in size, adult abundance, and occupancy rates were detected for many principal exploited species in protected areas, which harbored a disproportionately greater number of adult spawning fishes. In contrast, density and occupancy rates for aquaria and non-target reef fishes fluctuated above and below baseline levels in each management zone. Observed decreases in density of exploited species below baseline levels only occurred at the Tortugas Bank area open to all fishing. Our findings indicate that these NTMRs, in conjunction with traditional fishery management control strategies, are helping to build sustainable fisheries while protecting the fundamental ecological dynamics of the Florida Keys coral-reef ecosystem.

Disciplines

Biology

Copyright

2012 Elsevier.