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This page last updated: April 02, 2002
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Platform
Communities
More than 4,000 oil and gas platforms are located in the northern Gulf of
Mexico, all but 13 percent are on the continental shelf shallower than 200
meters. Each structure provides both hard substrate and a complex habitat where
none existed before extending from the bottom to the surface.
Many MMS studies have investigated the role platforms serve as artificial reef
habitat, both for fish communities, and also as hard substrate in an environment
where the surrounding bottom is most always soft mud.
As seen here, platforms provide
habitat for thousands of fish. One
Coastal Marine Institute (CMI) study
funded by MMS determined that a
typical 8-leg structure provides a home
for 12,000 to 14,000 fish1. |
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The bare steel structure on this High Island A389 platform developed into a high-relief community over 10 years between 1982 and 1992. Eight platform legs in water 50 meters deep provides about 2,500 square meters of hard substrate. |
New studies are targeting the question of whether or not platforms are
productive or simply attract fish.
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A sergeant major fish is seen here
circulating water over its egg nest on platform HIA 389 clearly
demonstrating that at least some species of fish living on platforms produce
and export new biomass (more fish) rather than simply being attracted to the
structure. |
A new three-year MMS/CMI study2 is now investigating the occurrence
and origins of reef corals on offshore platforms.
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To the left are several colonies of the
large star coral, Montastrea cavernosa on WC 643, a twenty-six year old
platform. This coral is ranked fourth in abundance on the Flower Garden
Banks located 30 nmi to the west. |
To the right, four coral species are
growing on another part of the WC 643 platform structure at a depth of 27
meters. The large coral in the center is the brain coral Diploria
strigosa, it is the second most abundant species on the Flower Garden
Banks. Below it is the ten-ray star coral, Madracis decactis. The
orange coral clumps are cup coral, Tubastraea coccinea. A small patch
of the hydrozoan firecoral Millepora alcicornis is also present to
the left of the brain coral. |
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Diving scientists attach settling plates
to a platform structure. The ceramic tiles will be collected later to look
for tiny coral colonies. The coral’s DNA will be used to determine their
origins. Do newly settled corals come from the Flower Garden Banks or from
other platforms that are also coral habitats? |
1 Stanley, D.R. and C.A. Wilson. 2000 Seasonal and spatial variation in
the biomass and size frequency distribution of the fish associated with oil and
gas platforms in the northern Gulf of Mexico. Final report to U.S. Department of
the Interior, Minerals Management Service. OCS Study MMS 2000-005. 252 pp.
2 Sammarco, P. Coastal Marine Institute study for Minerals Management
Service. 2001-2003. Gulf Drilling Platforms as an Environmental Asset: Long-Term
Artificial reefs and Sites for Coral Recruitment. Gregory Boland, Project
Officer.
Photo Credits: All photographs by Gregory S. Boland
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