Parent Layer: Benthic Images and Videos

Name: 2008-2009 NCCOS Benthic Data

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Description: In the first six years, we chose to adopt a sampling protocol that focused on habitat interfaces (i.e., areas where coral reef meets seagrass/algal plain), using randomly selected, permanent transects. The area within and outside the Reserve was divided into three strata: 1) the existing Dry Tortugas National Park (DTNP, Park), 2) the Reserve (not falling within the existing jurisdiction of the DTNP), and 3) a 5 km buffer around the Reserve not within the DTNP (Out) for before/after comparisons (a Before-After Control Impact (BACI) sampling strategy (Underwood 1991). Lines were drawn through the longest axis of the Tortugas Bank and DTNP, normal to the prevailing northwest-southeast currents and bisecting these features into areas facing either upstream (North) or downstream (South; Fig. 1). In conjunction with the Reserve, Park, and Out strata, the interface zones along both of the large reef structures in Tortugas North (Tortugas Bank and DTNP) were designated as one of six categories: 1) Out North; 2) Out South; 3) Park North; 4) Park South; 5) Reserve North; and 6) Reserve South. We then used bathymetry to expand our sampling to reef and bank edges throughout all of the desginations. Paired band transect visual censuses were made by divers over the reef and soft bottom habitat along the 30 m transects conducting fish counts were made within 1 m on either side of the permanent transect. These methods also included using video then to collecting in situ images every meter that were later analyzed for benthic cover using CPCe.

Copyright Text: Shay Viehman - NOAA/NCCOS - Shay.Viehman@noaa.gov Fonseca, M. S., A. V. Uhrin, C. A. Currin, J. S. Burke, D. W. Field, C. A. Addison, L. L. Wood, G. A. Piniak, T. S. Viehman, and C. S. Bonn. 2006. Ongoing Monitoring of Tortugas Ecological Reserve: Assessing the Consequences of Reserve Designation. NOAA Technical Memorandum NOS NCCOS 22. 48 pp. Burke, JS, TS Viehman, JC Taylor, and MS Fonseca. 2010. Impact of the Tortugas North Ecological Reserve on the Fish Community. Poster: http://www.conference.ifas.ufl.edu/FloridaKeys/Presentations/PDFS/Session%202/Burke%20Impact%20of%20Tortugas%20North%20Session%202.pdf

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Fields:

• OBJECTID_1 ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Site ( type: esriFieldTypeString, alias: Site, length: 254 )
• Year ( type: esriFieldTypeInteger, alias: Year )
• Data_Sourc ( type: esriFieldTypeString, alias: Organization Source, length: 254 )
• Project ( type: esriFieldTypeString, alias: Project, length: 254 )
• Strata ( type: esriFieldTypeString, alias: Strata, length: 254 )
• Longitude ( type: esriFieldTypeDouble, alias: Longitude )
• Latitude ( type: esriFieldTypeDouble, alias: Latitude )
• Depth ( type: esriFieldTypeInteger, alias: Depth (ft) )
• Coral ( type: esriFieldTypeDouble, alias: Coral (% Cover) )
• Octocoral ( type: esriFieldTypeDouble, alias: Octocoral (% Cover) )
• Sponge ( type: esriFieldTypeDouble, alias: Sponge (% Cover) )
• Macroalgae ( type: esriFieldTypeDouble, alias: Macroalgae (% Cover) )
• Sand ( type: esriFieldTypeDouble, alias: Sand (% Cover) )
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