Methods               

View Map of Bermuda

Abstract

Introduction
Bermuda
Coral Reefs
BBD
Diploria strigosa

Methods
John Smith Bay
Natural Arches

Results
Overview
Chi Square Test
Figure One
Data Table

Conclusion
Observed Mortality
Site Differences
Impacts of BBD
Future Research

Glossary

Bibliography

Contact Information

 

John Smith Bay
         
John Smith Bay was researched on October 14, 2002.  I had previously tried to gather data at Tobacco Bay, but due to Northeastern winds John Smith Bay provided a more protected site and clearer waters.  At the beach I chose a random spot and waded into the ocean until water level was shoulder height.  I then swam out ten kicks of approximate equal strength. The direction of travel was in a line perpendicular to the shore.  At every tenth kick I would stop and view the area directly before me. Peripheral vision was not considered.  At each interval Diploria strigosa, healthy and diseased, were counted. The approximate size of death relative to the healthy tissue in diseased corals was also recorded on an underwater writing board. It is important to note that in order to obtain a correct size of death in diseased corals I had to snorkel around the coral heads, so that all dead tissue was accounted for. However, I always returned back to the original spot of viewing to continue the 10-kick intervals.
          The direction of travel changed three times due to complications of the ocean floor topography. The first direction change occurred 100 kicks from shore. The depth was too deep to clearly see the amount of disease tissue; therefore I swam back to the last location of found corals, 60 kicks, and turned 90 degrees to the right, swimming parallel to the shoreline. Turning to the right was chosen over left because I was snorkeling along the outer edge of the reef. Left would have resulted in swimming over a sandy bottom with few to no coral heads. 50 kicks later a giant rock was blocking the direction of travel.  Brain corals found on the rock were counted and then I swam 10 kicks 90 degrees left of the rock. Turning right would have caused me to hit a coastline cliff, thus left was chosen. Ten kicks out from the rock I pivoted 90 degrees, so the direction of travel would be parallel with the coastline preventing another encounter with deep water.  Brain corals were counted at the 90 degree pivot point while I was facing the direction parallel with the shore, so transect line data would be consistent.

Natural Arches
          The manner of counting healthy and diseased corals including relative death was replicated from John Smith Bay at Natural Arches on October 15, 2002.  The closest clump of boilers to the shoreline was chosen for my safety. Turbulent waves were disturbing the ocean floor reducing visibility and making it difficult to maneuver through the water. Two boilers with the greatest visibility were researched.  I randomly chose a point on the boiler and swam around in 5-kick intervals.   The direction around the boiler, either clockwise or counter-clockwise, was randomly chosen.  On boiler two data was gathered 360 degrees around, while only 180 degrees could be seen clearly on boiler one. All corals growing in the cup of the boiler were not viewed or counted due to breaking waves.

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John Smith Bay
 
Located on the South Shore of Bermuda.  Photo By M. Chmielewski, Copyright 2002.


Natural Arches
 
Located in Tucker's Town Bay in Castle Harbour, Bermuda.  Photo By D. Robertson, Copyright 2002.


Students at Natural Arches
Located in Tucker's Town Bay in Castle Harbour, Bermuda.  Photo By D. Robertson, Copyright 2002. 


Tobacco Bay
Located on the North Shore directly above St. George, Bermuda.  Photo By D. Robertson, Copyright 2002


Tobacco Bay
Located on the North Shore directly above St. George, Bermuda.  Photo By D. Robertson, Copyright 2002