Navigation Links
Bikini corals recover from atomic blast
Date:4/15/2008

Half a century after the last earth-shattering atomic blast shook the Pacific atoll of Bikini, the corals are flourishing again. Some coral species, however, appear to be locally extinct.

These are the findings of a remarkable investigation by an international team of scientists from Australia, Germany, Italy, Hawaii and the Marshall Islands. The expedition examined the diversity and abundance of marine life in the atoll.

One of the most interesting aspects is that the team dived into the vast Bravo Crater left in 1954 by the most powerful American atom bomb ever exploded (15 megatonnes - a thousand times more powerful than the Hiroshima bomb). The Bravo bomb vapourised three islands, raised water temperatures to 55,000 degrees, shook islands 200 kilometers away and left a crater 2km wide and 73m deep.

After diving into the crater, Zoe Richards of the ARC Centre of Excellence for Coral Reef Studies and James Cook University says, I didnt know what to expect some kind of moonscape perhaps. But it was incredible, huge matrices of branching Porites coral (up to 8 meters high) had established, creating thriving coral reef habitat. Throughout other parts of the lagoon it was awesome to see coral cover as high as 80 per cent and large tree-like branching coral formations with trunks 30cm thick. It was fascinating Ive never seen corals growing like trees outside of the Marshall Islands.

The healthy condition of the coral at Bikini atoll today is proof of their resilience and ability to bounce back from massive disturbances, that is, if the reef is left undisturbed and there are healthy nearby reefs to source the recovery.

However the research has also revealed a disturbingly high level of loss of coral species from the atoll. Compared with a famous study made before the atomic tests were carried out, the team established that 42 species were missing compared to the early 1950s. At least 28 of these species losses appear to be genuine local extinctions probably due to the 23 bombs that were exploded there from 1946-58, or the resulting radioactivity, increased nutrient levels and smothering from fine sediments.

The missing corals are fragile lagoonal specialists slender branching or leafy forms that you only find in the sheltered waters of a lagoon, Zoe explains. While corals in general have shown resilience, Zoe adds that the coral biodiversity at Bikini Atoll has proven only partially resilient to the disturbances that have occurred there.

Maria Beger from the Commonwealth Research Facility for Applied Environmental Decision Analysis at The University of Queensland took a Geiger counter with her on the expedition.

The ambient gamma radiation the residential island of Bikini atoll was fairly low pretty much like the background radiation in an Australian city. However when I put the Geiger counter near a coconut, which accumulates radioactive material from the soil, it went berserk, Maria remembers.

Extensive decontamination works have been carried out at Bikini atoll making it safe to visit, however local produce is unsafe to eat, and it is unlikely the Bikinian people will return to live on Bikini Atoll in the near future.

The coral survey was carried out at the request of the atolls local government. For comparison the team also dived on neighbouring Rongelap Atoll, where no atomic tests were carried out directly although the atoll was contaminated by radioactive ash from the Bravo Bomb and local inhabitants were also evacuated and for the most part, have not returned. The marine environment at this Atoll was found to be in a pristine condition.

The team thinks that Rongelap Atoll is potentially seeding Bikinis recovery, because it is the second largest atoll in the world with a huge amount of coral reef diversity and biomass and lies upstream from Bikini.

Zoe says that ironically, thanks to the bombs, Bikini Atoll represents a priceless laboratory showing how in the absence of ongoing stress, some corals have the capacity to recover from vast upheavals, which may contain valuable lessons for the management of reefs in other parts of the world including Australia.

Apart from occasional forays of illegal shark, tuna and Napoleon Wrasse fishing, the reef is almost completely undisturbed to this day. There are very few local inhabitants and the divers who visit dive on shipwrecks, like the USS Saratoga, and not on the reef says Maria.

Because of its incredible history and current undisturbed character Bikini Atoll is now part of a larger project to have northern Marshall Island Atolls World Heritage listed. The expedition served to illustrate the tragic history of the Bikinian people is not entirely reflected below the surface because the reefs of Bikini are recovering to present themselves as havens of abundance to the marine life of the Northern Pacific Ocean.


'/>"/>

Contact: Zoe Richards
Zoe.Richards@jcu.edu.au
074-781-4321
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

Related biology news :

1. Stanford researchers say living corals thousands of years old hold clues to past climate changes
2. Starfish outbreak threatens corals
3. Immediate action needed to save corals from climate change
4. Wildlife Conservation Society study finds seasonal seas save corals with tough love
5. New south Florida nursery to focus on staghorn corals
6. IAEA helps recover stray radioactive sources in Nigeria
7. Recovering from a mass extinction
8. Diet and lifestyle critical to recovery, says study
9. Beetle dung helps forests recover from fire
10. MSU researcher helps develop computer game for Ugandan children recovering from cerebral malaria
11. Recovery from acid rain much slower than expected
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/25/2016)... , Jan. 25, 2016  Glencoe Software, the world-leading ... and publication industries, will provide the data management solution ... (NPSC). ... Phenotypic analysis measures the ... organisms, allowing comparisons between states such as health and ...
(Date:1/21/2016)... India , January 21, 2016 ... According to a new market research report "Emotion Detection ... and Others), Software Tools (Facial Expression, Voice Recognition ... Regions - Global forecast to 2020", published by ... is expected to reach USD 22.65 Billion by ...
(Date:1/20/2016)... Jan. 20, 2016  Synaptics Incorporated (NASDAQ: ... solutions, today announced sampling of S1423, its newest ... and small screen applications including smartwatches, fitness trackers, ... round and rectangular shapes, as well as thick ... with moisture on screen, while wearing gloves, and ...
Breaking Biology News(10 mins):
(Date:2/11/2016)...  Neurocrine Biosciences, Inc. (NASDAQ: NBIX ) today announced its ... --> --> For the ... $29.3 million, or $0.34 loss per share, compared to a net ... same period in 2014. For the year ended December 31, 2015, ... loss per share, as compared to a net loss of $60.5 ...
(Date:2/11/2016)... ATLANTA , Feb. 11, 2016  Wellcentive ... a Portland, Oregon -based community ... to provide population health analytics, quality reporting and ... help FamilyCare strengthen its team of quality managers, ... reporting to the provider groups serving FamilyCare members. ...
(Date:2/11/2016)... ... February 11, 2016 , ... Reichert Technologies, which has ... to pursue the highest level of accuracy and quality with the addition of ... the AR5 Refractometer. Accurate, reliable and tough enough for the most demanding ...
(Date:2/10/2016)... , Feb. 10, 2016  The Maryland House ... , has announced that University of Maryland School of ... MBA and University of Maryland Medical System President and ... the "Speaker,s Medallion," the highest honor given to the ... Delegates. Dean Reece and Mr. Chrencik ...
Breaking Biology Technology: