Navigation Links
New evidence highlights threat to Caribbean coral reef growth

Coral reefs build their structures by both producing and accumulating calcium carbonate, and this is essential for the maintenance and continued vertical growth capacity of reefs. An international research team has discovered that the amount of new carbonate being added by Caribbean coral reefs is now significantly below rates measured over recent geological timescales, and in some habitats is as much as 70% lower.

Coral reefs form some of the planet's most biologically diverse ecosystems, and provide valuable services to humans and wildlife. However, their ability to maintain their structures and continue to grow depends on the balance between the addition of new carbonate, which is mostly produced by corals themselves, set against the loss of carbonate through various erosional processes. Scientists have long known that reef ecosystems are in decline and that the amount of live coral on reefs is dwindling. But the paper, published on DATE TBC in Nature Communications, is the first evidence that these ecological changes are now also impacting on the growth potential of reefs themselves.

Professor Chris Perry of the University of Exeter, who led the research, said: "Our estimates of current rates of reef growth in the Caribbean are extremely alarming. Our study goes beyond only examining how much coral there is, to also look at the delicate balance of biological factors which determine whether coral reefs will continue to grow or will erode. Our findings clearly show that recent ecological declines are now suppressing the growth potential of reefs in the region, and that this will have major implications for their ability to respond positively to future sea level rises.

"It is most concerning that many coral reefs across the Caribbean have seemingly lost their capacity to produce enough carbonate to continue growing vertically, whilst others are already at a threshold where they may start to erode. At the moment there is limited evidence of large-scale erosion or loss of actual reef structure, but clearly if these trends continue, reef erosion looks far more likely. Urgent action to improve management of reef habitats and to limit global temperature increases is likely to be critical to reduce further deterioration of reef habitat."

The team was funded by the Leverhulme Trust (UK), through an International Network Grant. It included scientists from James Cook University and The University of Queensland in Australia, from The University of Auckland in New Zealand, Memorial University in Canada, and the University of Maine in the USA. They examined rates of carbonate production across 19 reefs in the four Caribbean countries of the Bahamas, Belize, Bonaire and Grand Cayman.

They discovered that declines in rates of carbonate production were especially evident in shallow water habitats, where many fast growing branching coral species have been lost. The study compared modern day rates with those measured in the region over approximately the last 7,000 years. In key habitats around the Caribbean, the findings suggested that in waters of around five metres in depth, reef growth rates are now reduced by 60-70% compared to the regional averages taken from historical records. In waters of around 10 metres in depth, the rates are reduced by 25%.

The study also suggests that these key habitats must have a minimum of around 10% living coral cover to maintain their current structures. The amount of cover varies between sites, but some are already below this threshold and are therefore at risk of starting to erode. Given that previous studies have shown that coral cover on reefs in the Caribbean has declined by an average of 80 per cent since the 1970s, this raises alarm bells for the future state of reefs in the region. These changes have been driven by human disturbance, disease and rising sea temperatures, and are only expected to intensify as a result of future climate change.

Contact: Louise Vennells
University of Exeter

Related biology news :

1. Research reveals first evidence of hunting by prehistoric Ohioans
2. Strong scientific evidence that eating berries benefits the brain
3. UNH research adds to mounting evidence against popular pavement sealcoat
4. NIST/UMass study finds evidence nanoparticles may increase plant DNA damage
5. Evidence shows that anti-depressants likely do more harm than good, researchers find
6. Evidence of familial vulnerability for epilepsy and psychosis
7. New evidence that many genes of small effect influence economic decisions and political attitudes
8. DNA evidence shows that marine reserves help to sustain fisheries
9. New evidence in fructose debate: Could it be healthy for us?
10. Study provides first evidence of coevolution between invasive, native species
11. First direct evidence that elemental fluorine occurs in nature
Post Your Comments:
(Date:10/26/2015)... 26, 2015  Delta ID Inc., a company focused ... and PC devices, announced its ActiveIRIS® technology powers the ... F-02H launched by NTT DOCOMO, INC in ... second smartphone to include iris recognition technology, after a ... F-04G in May 2015, world,s first smartphone to have ...
(Date:10/23/2015)... , October 23, 2015 ... announce a mobile plug and play integration of physiological ... tasks SensoMotoric Instruments (SMI) present a ... solutions for eye tracking and physiological data registration. It ... SMI Eye Tracking Glasses 2w and physiological signals ...
(Date:10/22/2015)...  Synaptics (NASDAQ: SYNA ), a leading developer of human ... September 30, 2015. --> --> ... 66 percent over the comparable quarter last year to $470.0 million. ... million, or $0.62 per diluted share. --> ... of fiscal 2016 grew 39 percent over the prior year period ...
Breaking Biology News(10 mins):
(Date:11/26/2015)... , November 26, 2015 ... device company specializing in imaging technologies, announced today that it ... as part of the Horizon 2020 European Union Framework Programme ... a large-scale clinical trial in breast cancer. , ... , --> --> The ...
(Date:11/25/2015)... 2 nouvelles études permettent d , identifier ... souches bactériennes retrouvées dans la plaque dentaire des ... Ces recherches  ouvrent une nouvelle voie ... l,un des problèmes de santé les plus fréquemm ... --> 2 nouvelles études permettent d , ...
(Date:11/25/2015)... Nov. 25, 2015  Neurocrine Biosciences, Inc. (Nasdaq: ... President and CEO of Neurocrine Biosciences, will be presenting ... New York . ... website approximately 5 minutes prior to the presentation to ... the presentation will be available on the website approximately ...
(Date:11/25/2015)... SAN DIEGO , Nov. 25, 2015 ... that management will participate in a fireside chat discussion ... New York . The discussion is ... Time. .  A replay will ... Contact:  Media Contact:McDavid Stilwell  , Julie NormartVP, Corporate ...
Breaking Biology Technology: