CC106LecNotes - Test1 15/01/200913:20:00 Lecture1 Collapses...

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Test 1 15/01/2009 13:20:00 Lecture 1     Collapses o Easter Island- Fairly technologically advanced society Moai - statues that represent deceased leaders. Carving and erecting hundreds of massive statues takes a  large advanced  society. At the time of European contact on Easter Island… There was no evidence of an advanced society. What happened?   They commited  ecocide Lecture 2 Our perception determines reality o Up to 1600s- Plants animals fungi- Seen with the naked eye. o 1674- large single celled- seen with microscope. o 1865- Bacteria- germ theory o 1935- Viruses- Microscope. Large range of organism size.
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Earth’s Biodiveristy is Built on a Foundation of Microbes o Historical Foundation Earliest organisms were microbes For over 2 billion years, only microbes. Microbes change the enviornment on a global scale. For example, photosynthesis is a microbial invention (captures  sun’s energy in the form of biological macromolecules and  produced atmospheric oxygen) o Contemporary Ecological Foundation Ecosystem functioning For example, bacteria allow the abundant atmospheric nitorgen  to be utilized by plants by “fixing” it into forms accessible to  plants. Defining Life o What distinguishes living from non-living matter? “vital force” Dominent explanation  a few hundred years ago. Life could spontaneously generate.” Life could be infused into the lifeless. Movement Metabolism Irritability Homeostasis
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Natural Selection But, all of the known living cellular organisms are derived  from a common ancestor. Life begets life.   o Requirements for Natural Selection to Operate Variability-  differences among individuals Heritability-  offspring must resemble their parents Differential Reproduction-  due to heritable variation,  individulals differ in the reproductive sucsuess. Biodiversity II All hereditarily based variation at all levels of organization. Lecture 3 Early Ideas About Fossils o Shark teeth were the first fossils recognized to come from once living  organisms. o Also proved that species could become extinxt Geological Processes o Over a long enough time, even a slow process has major affects. Catastrophism o Assumption: Earth’s agie is very short. o Earth’s history is dominated by violent events.
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Uniformitarianism o Assumption: Present day forces also operated in the past o Earth history dominated by smal-scale events typical of the present . o
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CC106LecNotes - Test1 15/01/200913:20:00 Lecture1 Collapses...

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