BIOL 3130 Lecture Notes - Lecture 4: Punctuated Equilibrium, Anthropocene, Flowering Plant

• School: University of Guelph
• Department: Biology
• Course: BIOL 3130
• Professor: Andrew Mac Dougall

Document Summary

Challenges of a crisis discipline: ma(cid:374)(cid:455) differe(cid:374)t (cid:449)a(cid:455)s that (cid:858)di(cid:448)ersit(cid:455)(cid:859) (cid:272)a(cid:374) (cid:271)e defi(cid:374)ed a(cid:374)d (cid:373)a(cid:374)aged, more species than solutions, with often limited demographic i(cid:374)for(cid:373)atio(cid:374) (cid:894)e. g. , ca(cid:374)ada(cid:859)s (cid:862) a a. Tud(cid:455): ge(cid:374)o(cid:373)e stud(cid:455) re(cid:448)eals (cid:858)gre(cid:455) zo(cid:374)e(cid:859) of a(cid:374)i(cid:373)als tra(cid:374)sitio(cid:374)i(cid:374)g fro(cid:373) o(cid:374)e spe(cid:272)ies to t(cid:449)o: 0. 5% to 2% difference b/w genomes in process of splitting into 2 new species, but occasionally exchange genetic material (hybridize) Note: after extinction: typically after, there is biological limitations that species must adjust to (drives speciation, low density of species (drives speciation) Note: there is a general decrease in extinction over time this is likely due to that the earth has come to a general stabilization, and nature starts to figure its self out better over time. Punctuated equilibrium- massive burst in speciation & diversity: gradual increase in species. Massive extinction events: very rare: 5 times in 3 billion years, general decrease in extinction over time- earth(cid:859)s e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t sta(cid:271)ilizi(cid:374)g (cid:894)lo(cid:449)er le(cid:448)els of co2(cid:895)