While detection rates were consistent with potential
land-based sources of pollution and population along Florida
Keys, the prevalence of viruses in the Dry Tortugas was
higher than expected. All three of the reefs sampled (100%)
were positive for at least one viral target. White Shoals
Reef was only positive in 2003 (adenovirus); however, Bird
Key, closely located to White Shoals and Ft. Jefferson, was
positive for norovirus in 2001 and adenovirus in 2003.
Black Coral Rock, located well outside of the Dry Tortugas
National Park, was positive for viruses in all three years
(enterovirus in 2001 and 2002, and adenovirus in 2003). In
addition to its remote location, Black Coral Rock was the
deepest reef sampled (mean depth of 22.3 m) and was
expected to act as a reference location.