Navigation Links
Health of coral reefs detected from orbit

Australian researchers have found Envisat's MERIS sensor can detect coral bleaching down to ten metres deep. This means Envisat could potentially monitor impacted coral reefs worldwide on a twice-weekly basis.

Coral bleaching happens when symbiotic algae living in symbiosis with living coral polyps (and providing them their distinctive colours) are expelled. The whitening coral may die with subsequent impacts on the reef ecosystem, and thus fisheries, regional tourism and coastal protection. Coral bleaching is linked to sea temperatures above normal summer maxima and to solar radiation. Bleaching may take place on localised and mass scales ?there was an extensive bleaching event in 1998 and 2002 likely linked to El Ni�o events.

"An increase in frequency of coral bleaching may be one of the first tangible environmental effects of global warming," states Dr. Arnold Dekker of Australia's Commonwealth Scientific and Industrial Research Organisation's (CSIRO) Wealth from Oceans Flagship program."The concern is that coral reefs might pass a critical bleaching threshold beyond which they are unable to regenerate."

Aerial or boat-based observation is the current method of detecting bleaching, but many reefs are either inaccessible or simply too large (the Great Barrier Reef has an area of 350 000 square kilometres) for an event that happens within a fortnight. Bleached corals may rapidly be colonised by blue-green to brown algae, more difficult to distinguish from live coral.

Repetitive, objective and broad-scale satellite coverage is the alternative. At this week's MERIS/AATSR Workshop in Frascati, Italy, the CSIRO team presented initial results using Envisat's Medium Resolution Imaging Spectrometer (MERIS). MERIS acquires images in 15 different spectral bands at 300 m resolution.

"Coral bleaching needs to be mapped at the global scale," Dekker adds. "High-spatial resolution satellites can only do it on a few reefs due to cost a
'"/>

Source:European Space Agency


Page: 1 2

Related biology news :

1. BioMed Central welcomes the new National Institutes of Health public access policy
2. OneWorld Health drug receives Orphan designation from U.S. and European regulatory agencies
3. Health costs soar as 60 million Americans classed as obese
4. Going To Extremes To Improve Human Health
5. Patient-choice C-section rate rises 36%: HealthGrades study
6. Grand Challenges in Global Health initiative funds Yale project
7. Health benefits of a Christmas brandy
8. Health of Acehnese reefs in the wake of the tsunami shows human impacts more harmful
9. Healthy coral reefs of Madagascar resisting damage from climate change
10. Health Canada approves cold and flu medicine
11. Mailman School of Public Health researchers report blood DNA can be early predictor of liver cancer
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Health coral reefs detected from orbit

(Date:10/29/2014)... York City on September 19, 2014, leading geneticist and ... of Genome Sciences and Medicine at the University of ... of Tel Aviv University, was awarded the 2014 Lasker-Koshland ... to her honorary degree from TAU, Prof. King was ... Medicine, and for the past 18 years she has ...
(Date:10/29/2014)... Cambridge, MA and Hebei, China — BGI Tech and ... sequencing of the Jujube genome. Jujube is the most ... Jujube genome is particularly difficult to sequence due the ... is the first time that a genome in the ... been recently published in Nature Communications ...
(Date:10/28/2014)... One of the tragic realities of cancer is ... highly toxic and their effectiveness varies unpredictably from ... is poised to change this reality by rapidly ... on an individual,s cancer before chemotherapy begins. , ... headed by Assistant Professor Melissa Skala has developed ...
Breaking Biology News(10 mins):Geneticist and humanitarian: Prof. Mary-Claire King receives Lasker Award 2BGI Tech and Hebei Agricultural University complete the genome sequencing of the jujube tree 2Improving breast cancer chemo by testing patient's tumors in a dish 2Improving breast cancer chemo by testing patient's tumors in a dish 3
... of the embryo in the uterus have found a ... vessels that sustain the embryo. Without this protein, which is ... embryo is unlikely to survive. This is the first ... estrogen spurs cell differentiation and blood-vessel growth in the uterus ...
... techniques are increasing hope of restoring fertility for women ... destruction of reproductive tissue. The same techniques can also ... protect against extinction of endangered animal species by maintaining ... can used to produce offspring at some point in ...
... percent of fish species in North American streams, rivers ... most detailed evaluation of the conservation status of freshwater ... 700 fishes now listed represent a staggering 92 percent ... previous 1989 study published by the American Fisheries Society. ...
Cached Biology News:Gap junction protein vital to successful pregnancy, researchers find 2Cryopreservation techniques bring hopes for women cancer victims and endangered species 2Silent streams? Escalating endangerment for North American freshwater fish 2Silent streams? Escalating endangerment for North American freshwater fish 3
(Date:10/27/2014)... 27, 2014 Ryan Carfley , Managing ... to sit down with Bryan Hamilton, the publisher of the ... discuss talent in the Research Triangle region of North Carolina. ... highlighted at the roundtable include the role of social ... of work/life balance and the unique role that Millennials play ...
(Date:10/27/2014)... -- The Italian company Roadrunnerfoot has ... its artificial "lower limb", after the German giant ...      (Photo: http://photos.prnewswire.com/prnh/20141027/713097 ) , ... judgement has arrived: Roadrunnerfoot, the small Italian company ... prostheses with composite materials, has won against global ...
(Date:10/27/2014)... , Oct. 27, 2014 Kalorama Information says ... Ebola concern in the United States ... The healthcare market researcher said the FDA,s Emergency Use Authorization ... diagnostic tests for the detection of the Ebola virus ... useful.  Kalorama routinely assess the IVD industry and its ...
(Date:10/27/2014)... MA (PRWEB) October 27, 2014 ... profit. SoundConnect , an industry leading unified ... its partners and agents to deliver cloud-based audio ... accelerate growth opportunities. , With SoundConnect’s Q4 ... every twenty-five video and/or web conferencing licenses sold, ...
Breaking Biology Technology:Personify's Ryan Carfley Talks Recruiting with Triangle Business Journal, RPG Solutions 2Personify's Ryan Carfley Talks Recruiting with Triangle Business Journal, RPG Solutions 3Italian Lower Limb Prosthesis Company Wins Lawsuit Against German Giant Ottobock 2Kalorama: PCR The Go-to Test in Ebola Fight 2Kalorama: PCR The Go-to Test in Ebola Fight 3SoundConnect Unveils Q4 Partner Incentives 2
... 2011 NewCardio, Inc., (OTC BB: NWCI) a cardiovascular ... Clinilabs, will utilize QTinno®, NewCardio,s automated cardiac safety solution, ... new drug under development for a central nervous system ... one important aspect of the trial. Clinilabs, ...
... a biotechnology company developing peptide therapeutics for metabolic diseases, ... as Chief Executive Officer. Dr. Gottesdiener joins Rhythm from ... President and Late-Stage Therapeutic Group Leader, with responsibility for ... and previously as head of early-stage clinical development programs. ...
... -- an open-source, web-based platform for data-intensive biomedical ... a "cloud computing" resource. A team of researchers ... and molecular biology at Penn State University; Kateryna ... State; and James Taylor from Emory University, developed ...
Cached Biology Technology:Clinilabs will Conduct Phase 1 Trial Using QTinno® 2Clinilabs will Conduct Phase 1 Trial Using QTinno® 3Clinilabs will Conduct Phase 1 Trial Using QTinno® 4Clinilabs will Conduct Phase 1 Trial Using QTinno® 5Rhythm Names Keith M. Gottesdiener Chief Executive Officer 2Galaxy DNA-analysis software is now available 'in the cloud' 2Galaxy DNA-analysis software is now available 'in the cloud' 3