It’s taken less than 40 years for disease and global
warming to destroy most of the staghorn and elkhorn
corals that provided sanctuary for reef fish and other
creatures in the Caribbean. New Scientist reports that UK
researcher Jenny Gill analyzed 40 years of data from 500
surveys of 200 Caribbean reefs They discovered that in
the late 1970s, white-band disease swept through the
reefs, killing 90 per cent of the spectacular elkhorn and
staghorn coral species In 1998, many remaining treelike
corals were wiped out in a massive bleaching event,
probably driven by global warming Large, weedy corals
took over, out-competing the remaining treelike corals.
Flat reefs now cover 75 percent of the Caribbean,
compared with just 20 percent in the 1970s. “It’s difficult
to see how to reverse any of this,” says Gill The biggest
problem, she says, is the sheer density of human population
- stresses on the coral include pollution and tourism
By contrast, reefs remain almost pristine across the
Indian Pacific, where human habitation is sparse.
Belize is doing something to protect its reefs
Researchers from the Wildlife Conservation Society at Glover’s Reef found that parrotfish are the most commonly
caught fish and as a consequence, coral cover has
declined in the area. At their urging, Belize passed new
laws to protect the country’s extensive coral reefs. One
law will protect parrotfish and other grazers, such as doctor
and surgeonfish These herbivores keep algae growth
in check, enabling corals to flourish In the past, fisherman
did not target the grazing fish; rather, they caught
mainly snappers and groupers. It was only when these
species declined that they turned to the next tier of the
food web, and parrotfish began to disappear.
The second set of regulations will protect Nassau
grouper, an endangered species. The rules set a minimum
and maximum size limit for fishermen. The third
regulation bans spearfishing within marine reserves;
it’s the main method by which locals catch groupers
and has caused severe declines of these species. South
Water Caye and Sapodilla Cayes marine reserves are now
closed to fishing, and the Pelican Cayes—a hotspot for
rare sponges and sea squirts—are also off-limits.
For more information about the efforts of WCS, visit
www.wcsgloversreef.org