Post Lec 20100909

Post Lec 20100909 - Learn about cutting-edge research over...

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1 Learn about cutting-edge research over lunch with cool profs September 13 - 17, 2010 11:30 AM Redpath Museum More info + schedule: www.mcgill.ca/science/ 2 Pre-lecture vocabulary It is expected that you understand the following basic terms and concepts prior to this lecture. From chapter 26 •p r o k a r y o t e • cell wall • membrane-enclosed organelle • nucleus • cytoskeleton • Photosynthesis From pg. 92 • ATP & cellular respiration From Robert May essay • taxon/taxa
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3 Lecture 3 Diversity of life and prokaryotes 9 September 2010 BIOL 111 – Organismal Biology 4 During which geological era did prokaryotes first appear? 4% 67% 19% 10% 1. Cenozoic? 2. Paleozoic? 3. Precambrian? 4. Mesozoic?
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5 Lecture outline • Diversity of life – What is diversity? – How is diversity measured? – Which groups show the greatest diversity? • Prokaryotes – prokaryotes vs eukaryotes – cell structure & morphology – 3 challenges of life 6 What is diversity? • Diversity of life • Biodiversity Degree of differences in: 1) Genetic variation 2) Species composition 3) Interactions within and between ecosystems This is commonly reserved for indices that measure both the number of species in a habitat as well as their relative abundances • Species diversity
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7 How many species of life exist on Earth today? 10 0000 1 million 10 mill i o n 100 million 1 billion 2% 4% 27% 41% 26% 1. 100,000 2. 1 million 3. 10 million 4. 100 million 5. 1 billion Some info to ponder…. • About 1.5 million species are already named • About 13,000 new species named each year • But 3,000 are synonyms (duplicated species) • Terry Erwin 1983, tree fogging – In one species of tropical tree found 160 beetle species unique to that tree species , about 50,000 tropical tree species, beetles are about 2/5 of insects which are about ½ of all species Discuss with your neighbour – How many species on Earth today?
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9 How many species of life exist on Earth today? 10 0000 1 million 10 mill i o n 100 million 1 billion 1% 2% 9% 31% 57% 1. 100,000 2. 1 million 3. 10 million 4. 100 million 5. 1 billion According to May 2002, taxonomists estimate… • 3 – 100 million extant eukaryotic species (May’s guess: 7 million) • Bacteria and Archaea numbers completely unknown (e.g. ~10,000 bacteria species identified but could easily be millions – 100s of millions) • ~99% of all species are extinct!
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Where do most species live? US/ Ca nad a E uro p e Ne o tro i cs (B ra z l, ... Afro ic s ( Co ng .. Asian tropics (Malays. Nort h er n Asia (Ru s . 0% 0% 0% 10% 16% 73% 1. US/Canada 2. Europe 3. Neotropics (Brazil, Ecuador up to S. Mexico) 4. Afrotropics (Congo and nearby countries) 5. Asian tropics (Malaysia/Vietnam to Indonesia) 6. Northern Asia (Russia/China) Plant diversity
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Animal diversity Main factors that control diversity •A r e a – In general doubling area increases number of species by 10-25% • Climate – Warm, wet areas have more species – But we don’t know exactly why http://www.qc.ec.gc.ca/faune/biodiv/en/methods/meth_invert_fish.html Data from St.
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Post Lec 20100909 - Learn about cutting-edge research over...

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