Diatoms and Diatomists

Diatoms are "simple" one-celled plants which first appeared in the world's oceans 150 million years ago, after dinosaurs had appeared on land. They didn't find theur way into lakes and streams until about 50 million years ago, after dinosaurs had disappeared. Although diatoms were late to arrive on the scene, they quickly put themselves at the top of the food chain of most of the living things in today's lakes and the modern ocean. Few organisms have been so successful.

Many diatoms are circular, some like Amphora (below) are more or less two-sided, or bilateral. Diatoms are constructed from two valves, one fitting part way inside another (previous page). Most diatoms are very small, one-tenth to one-hundredth of a millimeter. Atom is a word used for something very very small. Di means two of something. Di-atoms. Get it?


Amphora

Diatomists (people who classify and study diatoms) may be the most dedicated of all scientists. I know diatomists who have spent half their lives peering at diatoms through the two oculars of a biological microscope. Why are diatoms so fascinating?, so captivating?

For one thing, diatoms are beautiful. Their lacy, opaline valves are glassy and transparent under the microscope. They have riibs, radiating lines, spines, and countless pores, all organized in intricate geometric patterns of almost infinite variety.

As humans, we tend to believe that we are the most advanced of the life forms. How could a one-celled upstart, and a plant at that, be more advanced than we? However, in terms of the quality of inheritance (DNA), we may be no match for diatoms. There is scarecely a pond or stream where some species of diatom has not been pefectly tailored to sieze upon and exploit some small difference in the environment. Maybe its dangerous to look down the tube of a binocular microscope for more than a few hours. Maybe those biologists and geologists who lingered too long were unwittingly captured, not by beauty, but by superior DNA.

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