BISC 316 Lecture : Lecture 4
26 May 2011
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May 25/11 lecture 4 bisc 316 vertebrate biology. Fossils of organisms - more complex than bacteria. 2. 2 bya - eukaryotic organisms, o2 producing organisms -> changes oceans and atmosphere. End of proterozoic - soft bodied organissms that were capable of secreting articulating skeletal parts. No new phyla but 3x as many families. Many groups that dominated the rest of paleozoic www. notesolution. com. Plants, fungi, small anthropods (detritors - millipedes), large anthropods (predators. Deep rooted plants -> chemical weathering of soils -> decrease co2. Late c. highly differentiated - glaciations and regional floral differences. 95% of all marine species, including 12 families of fishes (acanthodii) 49% of tetrapods (27 families) - mammal-like reptiles have heavy losses. Pangea breaks up (jurassic and cretaceous) => diversification of flora and fauna. End of cretaceous - extinction of 40% of tetrapod families (dinosaurs, pterosaurs, marine reptiles, some mammals and birds)
