SYDNEY (Reuters) - For the past two years Australian scientists have been collecting and storing billions of reproductive cells from the Great Barrier Reef, hoping that this "spawn bank" will one day help rebuild and preserve the World Heritage site.
The reef, a popular tourist site worth billions of dollars annually to the Australian economy, is threatened by dredging, sedimentation and disease. Global issues such as ocean acidification and warming due to climate change also affect the reef's health.
Coral spawning takes place when colonies and species of coral simultaneously release egg and sperm cells for external fertilization. It occurs only once a year, in the spring and after a full moon, turning vast swathes of the ocean red with a slick of the cells.
"We are able to collect many billions of cells each year and keep adding genetic diversity," said Rebecca Spindler, from the Taronga Conservation Society Australia.
The sperm and egg cells are collected and frozen separately, on site, then brought back to the Taronga Western Plains Zoo in the town of Dubbo, some 400 km (250 miles) northwest of Sydney.
If needed, the cells could be mixed and fertilized in laboratories, then grown and transplanted to damaged reefs, although the team has yet to do so.
"Because of the success of fertilizing in vitro and the lack of predation we have many more viable cells that could be grown into adult coral," Spindler told Reuters.
The techniques they use, dubbed the Reef Recovery Initiative, were originally developed by Smithsonian Institution researcher Mary Hagedorn and have been applied to reefs in Hawaii and the Caribbean. Continued...