BIOC58H3 Lecture : Lecture 5

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14 Feb 2011
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We talked about proxies, evidence that has been mounted to support the claim that there have been major changes. The strongest evidence comes from looking at the small changes in ratios of oxygen. There are various isotopes that we looked at. Scientists looked at small changes of temperatures and the amount of ice in the antarctic and greenland. One key organism for about the last 65 years looks like this. They have little strands that form and complete a dynamic web. There are 275,000 of these species but each of them forms a test" which is the shell of the foram. You find them in the world"s oceans and other places and when they die they rain down to the floor of the ocean. You have large concentrations of these and each can be identified as species. What the environment was and also temperature indicators. They incorporate into their shell calcium carbonate caco3 and the critical bit is the oxygen.

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