Lecture #3 - Learn about cutting-edge research over lunch...

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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 • prokaryote • cell wall •m em b r a n e - e n c l o s e d organelle •n u c l e u s •c y t o s k e l e t o n • Photosynthesis From pg. 92 •A T P & c e l l u l a r r e s p i r a t i o n 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 •D ive rs i ty o f l i fe – What is diversity? –How is d ivers ity measured? – Which groups show the greatest diversity? •P roka ryo tes –prokaryotes vseukaryotes –ce l l structure & morpho logy –3 cha l lenges of l ife 6 What is diversity? i o f l i •B iod i 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 •Spec ies d i
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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…. •A b o u t 1 . 5 m i l l i o n s p e c i e s a r e already named b o u t 1 3 , 0 0 0 n ew s p e c i e s named each year •B u t 3 , 0 0 0 a r e s y n o n ym s (duplicated species) •T e r r y E rw i n 1 9 8 3 , t r e e f o g g i n g – 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) •B a c t e r i a a n d A r c h a e an um b e r s c om p l e t e l y unknown (e.g. ~10,000 bacteria species identified but could easily be millions – 100s of millions) •~99% of a l l spec ies are ext inct!
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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% •C l im a t e –Wa rm , we t a reas have mo re spec ies –Bu t don t know exac t ly why http://www.qc.ec.gc.ca/faune/biodiv/en/methods/meth_invert_fish.html Data from St.
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Lecture #3 - Learn about cutting-edge research over lunch...

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