Shipwrecks On Coral Reefs Harbor Unwanted Species
Shipwrecks on coral reefs may increase invasion of unwanted species of animals. According to a recent U.S. Geological Survey study, these unwanted species can completely overtake the reef and eliminate all the native corals, making the diversity of marine organisms on the reef decrease drastically. This study documents for the first time that a rapid change in the dominant biota on a coral reef is unambiguously associated with man-made structures.
The findings of the study suggests that the removal of these man-made structures sooner rather than later is the key to keeping the reefs healthy.
In many areas of the world, the health of coral reefs are declining, but by identifying the exact cause of the problem is difficult. Overgrowth of coral reefs by other species, such as algae, are usually attributed to environmental degradation, but bleaching, disease, damage by typhoons, overfishing, coastal development, pollution, and tourism can cause problems as well.
The study was conducted at Palmyra Atoll National Wildlife Refuge in the central Pacific, a relatively remote, comparatively pristine area where little human activity has occurred since WWII. In 1991, a 100-foot vessel shipwrecked on the atoll. Scientists first surveyed the area in 2004 and found a species called Rhodactis howesii —an organism related to sea anemones and corals—in low abundance around the wreck. In subsequent years, however, populations of this organism increased exponentially.
Scientists documented extremely high densities of R. howesii that were progressively decreasing with distance from the ship, whereas R. howesii were rare to absent in other parts of the atoll. They also confirmed high densities of R. howesii around several buoys.
Whether this phenomenon occurs on other coral atolls is unknown; however, in the case of Palmyra, the R. howesii infestation is beginning to reach catastrophic proportions, according to Dr. Thierry Work, the lead author of the study and a scientist at the USGS National Wildlife Health Center, Honolulu Field Station. Within a few years, R. howesii spread to where it now occupies nearly 1 square mile.
"Why this phenomenon is occurring remains a mystery," said Work. One possibility, he said, is that iron leaching from the ship and mooring buoy chains, accompanied with other environmental factors particular to Palmyra atoll, are somehow promoting the growth of Rhodactis.
"Given the ability of Rhodactis sp. to reproduce rapidly and completely smother reefs, managers are now facing the possibility that even with removal of the ship, sheer reproductive capacity of R. howesii may continue to fuel its invasion along the western reef shelf of Palmyra," Work said.
Understanding what constitutes a healthy underwater ecosystem, as well as what does not, is crucial to preventing further losses in species and habitat. This research illustrates a little-known problem that, unlike global warming and pollution, could be prevented by removing man-made debris such as shipwrecks from coral reefs before organisms like Rhodactis howesii can overtake or eliminate coral reefs that are healthy.
DO YOUR PART TO SAVE THE REEFS!