Navigation Links
Rare corals breed their way out of trouble
Date:10/21/2008

Rare corals may be smarter than we thought. Faced with a dire shortage of mates of their own kind, new research suggests they may be able to cross-breed with certain other coral species to breed themselves out of a one-way trip to extinction.

This finding, released by scientists at the ARC Centre of Excellence for Coral Reef Studies, has raised hopes for the ability of the world's corals to withstand the rigors of changing climates and human impacts, says lead author Zoe Richards.

"Coral reefs worldwide face a variety of marine and land-based threats and hundreds of corals are now on the red list of threatened species. It is often assumed that rare coral species face higher risks of extinction than common species because they have very small effective population sizes, which implies that they may have limited genetic diversity and high levels of inbreeding and therefore be unable to adapt to changing conditions," Zoe says.

"When we studied some particularly rare species of Acropora (staghorn corals), which you might expect to be highly vulnerable to extinction, we found some of them were actually hybrids in other words they had cross-bred with other Acropora species. This breaks all the traditional rules about what a species is." By hybridising with other species, these rare corals draw on genetic variation in other species, increasing their own potential to adapt to changing conditions.

"At this stage how it came about and who the breeding partners are isn't entirely clear, but what is evident is that rare corals previously thought vulnerable to extinction may have more ability to adapt than initally expected" she explains.

Acropora are the main reef-builders throughout the Indian and Pacific Oceans, and so of critical importance to the ability of reefs to cope with changing conditions. However, till now, very few clear cut examples of hybridisiation were known, and some people did not even accept that corals can cross-breed, Zoe says.

The common Acropora corals occur mainly on reef crests, flats and slopes, whereas several of the rare species occupy more marginal habitats, such as the deeper or extremely shallow water zones where the common species do not grow.

"When we looked at the genetic history of rare corals, we found that they exhibited unexpected patterns of genetic diversity. This suggests that, rather than being the dying remnants of once-common species, they may actually be coral pioneers pushing into new environments and developing new traits by virtue of the interbreeding that has enabled them to survive there.

"This is good news, to the extent that it suggests that corals may have evolved genetic strategies for survival in unusual niches and may prove tougher to exterminate than many people feared. With such tricks up their sleeve, it is even possible that the rare corals of today could become the common corals of the future."

Corresponding author Professor David Miller of CoECRS and James Cook University says the discovery is a refreshing piece of good news amid the frequently gloomy reportage about corals nowadays. "One would expect that rare corals would be especially at risk, but we've found that some appear to have developed mechanisms for coping with rarity," he says.

"Hybridising with another species actually makes a lot of genetic sense if you are rare and the next colony of your species may be hundreds of kilometres away. It suggests these creatures are far more resilient that we thought, based on what we know from the behavior of land animals."


'/>"/>

Contact: Zoe Richards
Zoe.Richards@jcu.edu.au
61-747-814-321
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

Related biology news :

1. How corals adapt to day and night
2. Research expedition on corals and global warming: Aug. 17-26 in Puerto Rico
3. 1/3 of reef-building corals face extinction
4. New study shows shallow water corals evolved from deep sea ancestors
5. Everythings coming up corals
6. New study predicts where corals can thrive
7. Bikini corals recover from atomic blast
8. Stanford researchers say living corals thousands of years old hold clues to past climate changes
9. Starfish outbreak threatens corals
10. Immediate action needed to save corals from climate change
11. Wildlife Conservation Society study finds seasonal seas save corals with tough love
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/6/2017)... LONDON , April 6, 2017 ... Control, RFID, ANPR, Document Readers, by End-Use (Transportation & ... Energy Facility, Oil, Gas & Fossil Generation Facility, Nuclear ... Healthcare, Educational, Other) Are you looking for ... Authentication sector? ...
(Date:4/3/2017)...  Data captured by IsoCode, IsoPlexis Corporation,s ... statistically significant association between the potency of ... objective response of cancer patients post-treatment. The ... cancer patients will respond to CAR-T cell ... to improve both pre-infusion potency testing and cell ...
(Date:3/28/2017)... -- The report "Video Surveillance Market by ... Devices), Software (Video Analytics, VMS), and Service (VSaaS, Installation ... 2022", published by MarketsandMarkets, the market was valued at ... reach USD 75.64 Billion by 2022, at a CAGR ... considered for the study is 2016 and the forecast ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... 11, 2017 , ... Proscia Inc ., a data ... titled, “Pathology is going digital. Is your lab ready?” with Dr. Nicolas Cacciabeve, ... and how Proscia improves lab economics and realizes an increase in diagnostic confidence.* ...
(Date:10/11/2017)... Tampa Bay, Florida (PRWEB) , ... October 11, ... ... Food and Drug Administration (FDA) has granted orphan drug designation to SBT-100, its ... antibody (sdAb) for the treatment of osteosarcoma. SBT-100 is able to cross the ...
(Date:10/10/2017)... Parks Associates announced today that Tom Kerber , Director ... , October 11 in Scottsdale, Arizona . Kerber will ... safety and security products impact the competitive landscape. ... Parks Associates: Smart Home Devices: Main Purchase Driver ... "The residential security market has experienced continued growth, and the introduction of ...
(Date:10/9/2017)... ... October 09, 2017 , ... The award-winning American Farmer television ... quarter 2018. American Farmer airs Tuesdays at 8:30aET on RFD-TV. , With global ... the challenge of how to continue to feed a growing nation. At the same ...
Breaking Biology Technology: