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Planktonic diatoms are of major biogeochemical importance in the sea; their photosynthesis contributes 40% of the total annual marine production (1).Their distinguishing feature is an areolated cell wall (frustule) composed of hydrated silicon dioxide and a small amount of organic matter organized as two unequally sized, overlapping valves (thecae) similar to a Petri dish.Det kunne man i hvert fald konkludere på baggrund af en artikel i Folketidende den 1. Nysgerrige fra alle ender og kanter valfartede til Sorø for at se fænomenet.Enkelte blev sure, da de opdagede, at det var en aprilsnar begået af journalist Holmgaard og fotograf Ellen Skovmand.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.

In fact, it may be absent throughout most of the global coastal ocean sites where it had been reported to dominate plankton dynamics, being replaced by 150 y and could be induced to resume photosynthesis and asexual, vegetative growth when resuspended in slurry cultures exposed to light and supplied with nutrients.

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.

Explore further: Eutrophication affects diversity of algae More information: The article Hundred years of genetic structure in a sediment revived diatom population has been published in the scientific journal Proceedings of the National Academy of Sciences of the United States of America (PNAS).

Credit: Lars Edler and Gustaaf Hallegraff 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.

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