Geography 2320A/B Study Guide - Midterm Guide: Common Starling, Krakatoa, Parthenogenesis
20 Oct 2016
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13 Oct, 2016
Lecture 6: Fundamental Biogeographic Processes
Read Chapter 6: 167-206
Learning objectives:
-define dispersal
-be comfortable discussing the main types and most important mechanisms of how species get around
-discuss how barriers halt the dispersal of species
-list and describe 3 main types of dispersal routes
-discuss what is needed for successful establishment of a colony
-dispersal -evolution -extinction
-rabbits introduces to port in Australia, quickly spread across the country within 100 years
-pushed out other species
Dispersal: movement if species away from their home range
-these eents allo expansion of the speies’ distriutions toard its fundamental geographic
range (livable environment)
Biogeographic Range: species shift their ranges by moving over long distances across large barriers
(bigger scales) -rare but important
ecological dispersal-move outwards from main population/ organism
Dispersion: spatial distribution as a whole
-successful dispersal involves: travel to a new area, withstanding the new conditions, establish a new
population
-two main types of dispersal: Jumps (chance, anthro) and Diffusion (slow)
Krakatau, Indonesia-volcanic explosion
-destroyed half the island
-recolonization-rapid-2 decades- 100 species
-European starling brought to NA by humans
-Cane Toad: Australia-introduced to control insect on the sugar cane crop
-ended up being very poisonous to other animals
-even eggs and tadpoles are poisonous to fish
-wiping out populations and taking over
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Be comfortable discussing the main types and most important mechanisms of how species get around. Discuss how barriers halt the dispersal of species. List and describe 3 main types of dispersal routes. Discuss what is needed for successful establishment of a colony. Rabbits introduces to port in australia, quickly spread across the country within 100 years. Dispersal: movement if species away from their home range. These e(cid:448)ents allo(cid:449) expansion of the spe(cid:272)ies" distri(cid:271)utions to(cid:449)ard its fundamental geographic range (livable environment) Biogeographic range: species shift their ranges by moving over long distances across large barriers (bigger scales) -rare but important ecological dispersal-move outwards from main population/ organism. Successful dispersal involves: travel to a new area, withstanding the new conditions, establish a new population. Two main types of dispersal: jumps (chance, anthro) and diffusion (slow) Cane toad: australia-introduced to control insect on the sugar cane crop. Ended up being very poisonous to other animals. Even eggs and tadpoles are poisonous to fish.
