Navigation Links
Reviving 100-year-old resting spores of diatoms
Date:3/1/2011

Diatoms account for a large proportion of the phytoplankton found in the water, and live both in the open sea and in freshwater lakes. By reviving 100-year-old spores that had laid buried and inactive in bottom sediment, researchers at the University of Gothenburg, Sweden, have shown that diatoms are also genetically stable and survival artists.

Recent research has shown that diatoms exhibit great genetic differences and that they occur in discrete populations, which means that they multiply sexually to a greater extent than previously believed. What makes diatoms special is that if the environment they live in becomes too inhospitable they form resting spores, which gather in sediment at the bottom of the sea. When conditions improve, the spores can be revived.

The study concerned is based on a sample of sediment from a highly eutrophic Danish fjord on the east coast of Jutland, Mariager Fjord, whose anoxic bottoms and bottom sediments today do not show any signs of life. After dating the different layers of a sediment core, the researchers took small pieces of sediment from various depths and transferred them to an environment favourable to diatoms. This enabled them to revive resting spores.

"We revived hundreds of genetic individuals of diatoms and induced them to start dividing again and to form cloned cultures. The oldest are more than 100 years old, the youngest quite fresh. We then identified the revived individuals genetically," says Anna Godhe of the Department of Marine Ecology at the University of Gothenburg.

40 000 generations of diatoms

As diatoms normally divide once a day, this means that for a diatom a period of 100 years is equivalent to 40 000 generations. In human terms, this means genetic material equivalent to around 800 000 years.

"We found certain differences between the algae that went into a state of rest at the start of the 20th century compared with those that formed resting spores when the eutrophication was at its worst and the freshest ones of all, but the individuals are for the most part very homogeneous throughout the sediment core, that's to say 40 000 generations of diatoms."

No traces of genetic impact over 100 years

"The most exciting thing of all in the whole study is that there are no traces at all of genetic impact from the open sea population on the diatoms in Mariager Fjord during the 100 years we have studied, despite a constant influx of diatoms from the Kattegatt with the surface water. Not one out of all the millions upon millions of diatoms that have found their way into the fjord from the Kattegatt has become established and continued to grow in the fjord.

The researchers believe that this is due to the fact that the algae that live inside the fjord are so superbly well adapted to the fjord environment and that there are so many of them (millions per litre of water, thousands per gram of sediment) that colonisers from outside are rapidly out-competed.


'/>"/>

Contact: Anna Godhe
anna.godhe@marecol.gu.se
46-031-786-2709
University of Gothenburg
Source:Eurekalert  

Related biology news :

1. Fire may be key to reviving dogwood trees in Eastern forests
2. 100-year-old specimens at California museum help determine when avian pox hit Galapagos
3. 23andMe presents top 10 most interesting genetic findings of 2010
4. Floating spores kill malaria mosquito larvae
5. Fungal spores travel farther by surfing their own wind
6. C. difficile spores spread superbug
7. In many fungi, reproductive spores are remarkably aerodynamic
8. Diatoms reveal freshwater pollution
9. Ancient diatoms lead to new technology for solar energy
10. Mighty diatoms: Global climate feedback from microscopic algae
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Reviving 100-year-old resting spores of diatoms
(Date:5/16/2017)... , May 16, 2017  Veratad Technologies, LLC ( ... online age and identity verification solutions, announced today they ... Conference 2017, May 15 thru May 17, 2017, in ... and International Trade Center. Identity impacts ... and in today,s quickly evolving digital world, defining identity ...
(Date:4/18/2017)... April 18, 2017  Socionext Inc., a global expert in SoC-based ... edge server, the M820, which features the company,s hybrid codec technology. ... by Tera Probe, Inc., will be showcased during the upcoming Medtec ... show at the Las Vegas Convention Center ... Click here ...
(Date:4/11/2017)... -- Research and Markets has announced the addition of ... offering. ... market to grow at a CAGR of 30.37% during the period ... has been prepared based on an in-depth market analysis with inputs ... growth prospects over the coming years. The report also includes a ...
Breaking Biology News(10 mins):
(Date:8/15/2017)... NC (PRWEB) , ... August 15, 2017 , ... ... 2017, celebrating 10 years of successes helping medical technology companies and inventors develop and ... to a renowned full-service national engineering firm with a portfolio of clients in the ...
(Date:8/15/2017)... ... 15, 2017 , ... The Conference Forum and The Trout ... a series of upcoming panels and events. The partnership culminates with the 4th ... in New York City. , “With our experience in producing the Immuno-Oncology 360° NYC ...
(Date:8/14/2017)... ... 14, 2017 , ... The Conference Forum has confirmed the one-day ... on September 6, 2017 at the Marriott Copley Place in Boston, MA. , Returning ... and Regulatory Strategy, Pfizer Innovative Research Lab, Pfizer, who leads 19 industry speakers in ...
(Date:8/10/2017)... , ... August 09, 2017 , ... ... help the agriculture industry reach its ideal customers with the right message. Their ... , “As a Midwest company, we realize how crucial the agriculture industry is,” ...
Breaking Biology Technology: