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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 |
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Overview
In
total 60 Diploria strigosa coral heads were counted, 47 at John Smith Bay and 13 at Natural
Arches. Combining the data from both locations, white patches were the most
prevalent form of death found (15 corals), with algae overgrowth (4 corals) and black band disease
(2 corals)
consecutively. There was little difference between the
average amount of damage
caused by BBD, white patches, or algae overgrowth. A maximum of 75 percent
death was found at John Smith Bay, with the minimum being 1 percent at both
locations. However, more precise measurements rather than relative
estimation should be taken in future studies.
Overall 35 percent of the coral observed was
inflicted with some type of disease or displayed signs of past death.
Chi
Square Test for Site Differences
A
chi square contingency test
with a 0.05 level of significance was performed against the locations and type
of D. strigosa found. At John Smith Bay 25.5 percent were found diseased,
while Natural Arches showed 69 percent.
Yates' correction for continuity
was implemented since a low number of
corals were observed at Natural Arches. The p value of .009 showed
significant difference between sites. Since no other measurements were
taken at the sites during observations no definite reasons for the difference
can be concluded, only that the difference is not by
chance.
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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.
Natural
Arches
Located
in Tucker's Town Bay in Castle Harbour, Bermuda. Photo By D.
Robertson, Copyright 2002.
BBD
on brain coral
Photo By
E.C. Peters.
Copyright 2000, used with permission.
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