Psychology 3720F/G Lecture Notes - Lecture 2: Grouper, Wrasse, Stotting

• School: Western University
• Department: Psychology
• Course: Psychology 3720F/G
• Professor: Doug Hazlewood

Document Summary

Obs 1: with no env pressure, species can multiply geometrically. Obs 2: under natural conditions, the size of a population remains constant over long periods of time. Conclusion: not all individuals will survive and reproduce (there must be a struggle for existence) Obs 3: not all members of a species are the same (variation between individuals) Part 2: could helping behaviour evolve through the process of natural selection. Behaviour that increases the fitness of the recipient and decreases the fitness of the helper (unselfish helping) . how could this evolve through the process of natural selection. Good for the other members of the group because it gives them a chance to escape. May not be good for the caller because by giving the alarm will draw attention to itself and increase their chances of being caught. This can be altruistic because it increases the fitness of the others and decrease the fitness of the caller.