| At Molasses Reef in the Florida Keys, a patch of approximately 15 Acropora palmata colonies were observed to have numerous
ring-shaped lesions, only 2 or 3 smaller colonies were lacking these distinct
rings. |
Some colonies were more affected than others but consistent patterns such as portion of colony or part of the patch could not be seen. There
are several vigorously defended damselfish territories in this patch, in some
cases rings were found adjacent to these territories suggesting that a predator
would have to be tolerant of damselfish bites. Another patch (0.3 miles away)
was surveyed and no such scars were seen. Colonies from this patch were
photographed 2 days apart and in some cases, it seemed that some new rings
appeared- new rings were the same size and equally distinct suggesting that the
difference in white-ness is not necessarily a progression (healing or
worsening).
Scars that were identical in appearance were photographed
by Margaret Miller on one or two A. palmata colonies as well as some Millepora
complanata in August 1999 at Pickles Reef (several miles south of Molasses
Reef). While surveying this site, some marks were seen on one M. complanata
colony, though they were far less distinct than those photographed by Dr. Miller
so I could not be sure that they were the same type of scar.
Figure - A Large colony (approx 1m in height) with many ring-shaped
scars, note haphazard distribution on colony and uniform size.
Figure
- B Close up with scale showing ring diameter approximately 2cm. Note the patch in the lower right appears to be two overlapping rings with algal turf in center. This was seen on a few other colonies but was not the
typical appearance.
Figure
- C Underside of branch showing particularly distinct rings.
Figure - D Topside of a branch showing less distinct but overlapping rings.
Figure - E Rings adjacent to a vigorously defended damselfish
territory.
Figure - F Marks on M. complanata. |