Even seaweeds can get sunburnedAugust 23rd, 2008 - 6:30 pm ICT by ANI
Washington, August 23 (ANI): A new research by scientists from the Alfred Wegener Institute on Spitsbergen in Norway has determined that even marine organisms like seaweeds can get sunburned.
The research says that too much sun is not only bad for humans, but many plants react sensitively to an increased dose of ultraviolet radiation as well.
With the help of pigments absorbing solar energy and light, plants produce their vitally important building blocks by means of photosynthesis.
However, this has its limits: too much sun means an over-abundance of energy and thus the destruction of the sensitive pigments.
The result is black spots, pale leaves and rotten parts.
Since algae cannot apply sun lotion like we do, they develop their own strategies to protect from the sun.
According to Dr. Christian Wiencke, marine biologist at the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association, “A species of red algae, for instance, produces under increased ultraviolet radiation less red light-harvesting proteins, thus decreasing the absorption of radiation. The typical red colour of the alga fades and the plant gets white tips.”
“The algae additionally produce substances which react similar to melanin in human skins: mycosporin amino acids (MAA),” he added.
Melanin absorbs ultraviolet radiation and thus protects the human skin - at the same time, it gives a natural suntan.
The ozone layer usually absorbs the major part of the hard and harmful solar ultraviolet radiation of short wavelength.
However, because of stratospheric ozone depletion, these dangerous rays increasingly penetrate to the earth’’s surface and therefore also to the seawater.
Extensive biological experiments are presently conducted on this complex of problems at the German French Research Base AWIPEV on Spitsbergen.
“We examine the harmful effects of ultraviolet radiation on algae and their protective mechanisms,” said Wiencke.
The ultraviolet radiation particularly harms the algae’’s photosynthesis and their hereditary material. These organisms usually react with a decreased rate of growth or a reduction of reproductive success.
The spores and germ cells of the algae which drift through the water as unicellular organisms are particularly sensitive. Even small ultraviolet doses are damaging and inhibit their germination.
“Our investigations show that the distribution of certain species of brown algae is inhibited by the climate of ultraviolet radiation. The algae are displaced into deeper water layers if ultraviolet radiation increases,” said Wiencke.
“We want to observe the development of marine coastal ecosystems in the face of global climate change. Not only an increased ultraviolet radiation plays a decisive role, but also the water temperature which has been increased by the greenhouse effect,” he added. (ANI)
- Even seaweeds are not protected from sunburn - Aug 23, 2008
- Marine life under threat from UV radiation - Jul 27, 2012
- How did higher life on Earth evolve? - Jun 04, 2010
- Bits of plastic endangering sea creatures - Apr 18, 2012
- Cream that gives you natural tan - Oct 17, 2010
- Whales also get sunburns! - Nov 10, 2010
- Blame your ancestors if you don't get a tan - Jun 22, 2010
- Arctic ozone layer depleted by 40 percent: Experts - Apr 06, 2011
- Strawberry extract protects skin against UV rays - Aug 05, 2012
- Chernobyl radiation reduced population of birds with orange plumage: Study - Apr 27, 2011
- Geography and radiation determine how you tan - Jun 22, 2010
- Germany, Canada to conduct joint ocean research - Aug 18, 2012
- Ozone layer 'no longer disappearing, will return to full strength by 2048' - Sep 21, 2010
- Life under threat as more ultraviolet radiation to hit earth - Sep 07, 2009
- FDA warns vacationers of tanning health risks as Memorial Day weekend approaches - May 26, 2010
Tags: alfred wegener institute, effects of ultraviolet radiation, human skins, marine biologist, marine organisms, natural suntan, protective mechanisms, red algae, solar ultraviolet radiation, stratospheric ozone depletion