Navigation Links
Ancient corals hold new hope for reefs
Date:3/1/2010

Fossil corals, up to half a million years old, are providing fresh hope that coral reefs may be able to withstand the huge stresses imposed on them by today's human activity.

Reef ecosystems were able to persist through massive environmental changes imposed by sharply falling sea levels during previous ice ages, an international scientific team has found. This provides new hope for their capacity to endure the increasing human impacts forecast for the 21st century.

In the world's first study of what happened to coral reefs when ocean levels sank to their lowest recorded level over 120 metres below today's levels a study carried out on eight fossil reefs in Papua New Guinea's Huon Gulf region has concluded that a rich diversity of corals managed to survive, although they were different in composition to the corals under more benign conditions.

"Of course, sea levels then were falling and today they are rising. But if we want to know how corals cope with hostile conditions, then we have to study what happens under all circumstances," explains Professor John Pandolfi of the ARC Centre of Excellence for Coral Reef Studies and The University of Queensland. "We've seen what happens to corals in the past when sea levels rose and conditions were favourable to coral growth: we wanted to see what happened when they fell and conditions were adverse."

"When sea levels drop you get a catastrophic reduction in coral habitat and a loss of connectivity between reefs. Well, those circumstances are in some respects similar to what corals are experiencing today due to human impacts so there are useful parallels."

"Although it is little asked, the question of where reef species go when faced with extreme environmental situations is highly relevant for understanding their prospects of survival in the future and what we need to do to give them the best chance," Prof. Pandolfi suggests.

In the Huon region, the team found, coral reefs survived the hard times low of sea levels with as much richness of species but with a different composition to what they had during the good times. "As a rule the coral colonies during the period of low sea levels were closer to the sea floor and slower-growing in comparison with times of high sea levels."

"What we have found suggests that reef systems are able to survive adverse conditions given suitable shallow rocky habitat. An interesting finding of this study is that complex coral ecosystems were maintained during the less optimal periods of low sea level. These may have been critical to the re-establishment of nearby reefs once environmental conditions began to improve."

"The fossil record shows that reefs have been remarkably successful in surviving large environmental disturbances. However the combination of drastic environmental changes that we're seeing today, such as degraded water quality, depleted fish stocks, coral bleaching, ocean acidification and loss of habitat are unprecedented in the history of coral reefs. Although this study clearly highlights the resilience of reef ecosystems, it is important not to underestimate the magnitude of the challenges that reefs are currently facing. "

Prof. Pandolfi says we somehow have to find ways of preventing or offsetting each of these impacts if we expect our reefs to ride out the major climatic changes of the 21st century in as good condition as they have in the past.


'/>"/>

Contact: John Pandolfi
j.pandolfi@cms.uq.edu.au
61-073-365-3050
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

Related biology news :

1. Ancient remains put teeth into Barker hypothesis
2. UF researchers: Ancient crocodile relative likely food source for Titanoboa
3. Chemical analyses uncover secrets of an ancient amphora
4. Using modern sequencing techniques to study ancient modern humans
5. Glacier melt adds ancient edibles to marine buffet
6. Loud and lazy but didnt chew gum: Ancient koalas
7. Late-surviving megafauna exposed by ancient DNA in frozen soil
8. Ancient DNA, not fossilized bones, shows late survival of Ice Age megafauna
9. Studying hair of ancient Peruvians answers questions about stress
10. Californias ancient kelp forest
11. Ancient penguin DNA raises doubts about accuracy of genetic dating techniques
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/28/2016)... , April 28, 2016 Infosys ... (NYSE: INFY ), and Samsung SDS, a global ... that will provide end customers with a more secure, fast ...      (Logo: http://photos.prnewswire.com/prnh/20130122/589162 ) , ... but it also plays a fundamental part in enabling and ...
(Date:4/26/2016)... Research and Markets has announced ... 2016-2020"  report to their offering.  , ,     (Logo: ... analysts forecast the global multimodal biometrics market to ... period 2016-2020.  Multimodal biometrics is being ... the healthcare, BFSI, transportation, automotive, and government for ...
(Date:4/15/2016)... 15, 2016 Research and ... Biometrics Market 2016-2020,"  report to their offering.  , ... , ,The global gait biometrics market is expected ... the period 2016-2020. Gait analysis generates ... be used to compute factors that are not ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... -- The Prostate Cancer Foundation (PCF) is pleased to announce 24 new ... prostate cancer. Members of the Class of 2016 were selected from a pool ... Read More About the Class of 2016 PCF Young Investigators ... ... ...
(Date:6/23/2016)... ... June 23, 2016 , ... Supplyframe, the Industry ... Supplyframe Design Lab . Located in Pasadena, Calif., the Design Lab’s mission ... hardware projects are designed, built and brought to market. , The Design Lab ...
(Date:6/23/2016)... LOUISVILLE, Ky. , June 23, 2016 /PRNewswire/ ... from two Phase 1 clinical trials of its ... double-blind, placebo-controlled, single and multiple ascending dose studies ... and pharmacodynamics (PD) of subcutaneous injection in healthy ... APL-2 subcutaneously (SC) either as a single dose ...
(Date:6/23/2016)... 23, 2016 On Wednesday, June 22, ... down 0.22%; the Dow Jones Industrial Average edged 0.27% lower ... 2,085.45, down 0.17%. Stock-Callers.com has initiated coverage on the following ... Therapeutics (NASDAQ: NKTR ), Aralez Pharmaceuticals Inc. (NASDAQ: ... BIND ). Learn more about these stocks by accessing ...
Breaking Biology Technology: