BIOL 304 Lecture Notes - Lecture 34: Phorusrhacidae, Marsupial, Species Richness
5 Mar 2018
School
Department
Course
Professor
Document Summary
Monday- review session: bring questions: o far (cid:449)e"(cid:448)e looked at e(cid:448)olutio(cid:374) fro(cid:373) the (cid:271)ioti(cid:272) le(cid:448)el between species, environment acting on species. External forces to evolution: ray troll artist, everything in the picture lived in utah at some point, wh(cid:455) do(cid:374)"t the(cid:455) li(cid:448)e there a(cid:374)(cid:455)(cid:373)ore, environmental change, natural selection, extinctions. Less erosion is occurring in deserts and in the high arctic would erode. Allopatric speciation: adding 100s millions of years to allopatric speciation (deep time, each continent that broke apart from pangea can have its own independent evolution. Orientation of north america: as continents are moving, their positions in relation to the equator change, north american rotated completely, positioning canada far from the equator. Ocean currents: as continents are separating, ocean currents are forming, causes different climatic zones to form, new circulation pathways opened up when planets separated, opening a corridor north of. Antarctica: cenozoic climatic deterioration, ~30mya; global temperatures plummeted, attributed to changes in ocean circulations due to, 1.
