HOME >> BIOLOGY >> NEWS
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 Nio 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 and
'"/>

Contact: Mariangela D'Acunto
mariangela.dacunto@esa.int
39-06-941-80-856
European Space Agency
3-Oct-2005


Page: 1 2

Related biology news :

1. Sugar and spice and everything nice: Health differences in newborn girls and boys
2. Health Physics Society
3. Johns Hopkins Bloomberg School of Public Health, Geisinger launch new environmental research group
4. Health care reimagined: Improving patient care through early health
5. Healthy coral reefs hit hard by warmer temperatures
6. Healthy reefs hit hardest by warmer temperatures
7. Kent State University and Summa Health System receive NIH grant to study prehypertension
8. Health disparities -- Genetics, society and race play an important role in access to healthcare
9. OneWorld Health selects Odyssey Research for phase 4 study in India
10. Healthy coastal wetlands would adapt to rising oceans
11. New Geisinger Health System building green Center for Health Research

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Health coral reefs detected from orbit

(Date:3/23/2015)... March 23, 2015   HOYOS Labs , a ... today announced that the Company will demonstrate multiple biometrics-based ... and consumers at Connect:ID on March 23 through 25, ... Labs will highlight the IEEE Biometric Open Protocol Standard; ... and enterprise access control system. BOPS was invented by ...
(Date:3/20/2015)... Conn. , March 20, 2015 NXT-ID, ... a biometric authentication company focused on the growing mobile ... smart wallet is one of the products featured in ... March 20th at 11:00 PM EST on the DIY ... to Las Vegas , site of ...
(Date:3/17/2015)... Emotient, the leader in facial expression ... availability of Emotient Analytics , the world,s ... facial expressions. The system analyzes videos of people ... services. It delivers audience response metrics - such ... derived from facial evidence of emotional states. Consumer ...
Breaking Biology News(10 mins):HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 2HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 3NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 2NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 3New Emotient Web Service Measures Audience Response Using On-Demand Facial Expression Analysis 2New Emotient Web Service Measures Audience Response Using On-Demand Facial Expression Analysis 3New Emotient Web Service Measures Audience Response Using On-Demand Facial Expression Analysis 4
(Date:3/31/2015)... (PRWEB) March 31, 2015 This June ... from the top U.S and International Medical Schools will ... latest research on the application of stem cell therapy ... symposium is organized and funded by the Ocular ... that has been convening intimate meetings of top experts ...
(Date:3/30/2015)... March 30, 2015 With recent advancements ... you the government, major companies are getting into the ... setting future mandates for renewable energy production, many homeowners ... , Solara Power is a new solar distribution company ... available that allow qualifying homeowners to enjoy the benefits ...
(Date:3/30/2015)... March 30, 2015  NuGene International, Inc. ("NuGene") ... NuGene BioPharma, Inc. has added another internationally recognized ... Guan is an internationally recognized researcher in bio-inspired ... education at Peking University, China ... the University of North Carolina, Chapel Hill. Following ...
(Date:3/30/2015)... A new national Labour Market Information (LMI) report was ... new graduates entering the biotech sector. The BioTalent Canada ... Grads in Biotech," is sponsored in part by ... features data collected from new graduates that participated in ... to 2015. Among the interesting trends that ...
Breaking Biology Technology:Sight Restoration Through Stem Cell Therapy - Subject of June Symposium of Experts 2Solara Power Announces Residential Solar Power with No Up-Front Fees 2UCI Professor Zhibin Guan Joins NuGene Advisory Board 2UCI Professor Zhibin Guan Joins NuGene Advisory Board 3New Report on Graduates in Canadian Biotech Industry Sheds Light on Hiring Practices 2New Report on Graduates in Canadian Biotech Industry Sheds Light on Hiring Practices 3New Report on Graduates in Canadian Biotech Industry Sheds Light on Hiring Practices 4
Cached News: