BIO 1130 Lecture : Silurian and Devonian lecture notes.doc

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24 Mar 2012
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BIO 1130 Full Course Notes
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BIO 1130 Full Course Notes
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Co2 is beginning to turn into sugars and organic carbon. Glaciation; the earth is chilled, oceanic waters are tied up, ice masses at the poles, decline in ocean levels due to ice = continental shelf diminishing. Continental shelf diminishes = collapse in productive zone. Lowering of volcanic activity; earth"s plates stabilize and there is less outgassing. At this point, oceans filled with invertebrates, single cells, prokaryotes, archea, bacteria etc. Mass extinction at the end of the ordivician. After extinction, most major architectures are still present. Loss in diversity; only certain morphologies survive and they become successful. First fish that appear in oceans due to arms race at the end of the. Cambrian (i. e. : ostracoderms); covered in plates of calcified bone for protection. They take advantage of the bottleneck and increase in numbers due to available habitat. Parasites on larger fish; uses teeth around the rim of mouth are used to attach itself to the fish.

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