Psychology 3228 Lecture Notes - Lecture 8: Anglerfish, Ingroups And Outgroups, Social Evolution

• School: Western University
• Department: Psychology
• Course: Psychology 3228
• Professor: Scott Mac Dougall- Shackleton

Document Summary

Group living and reciprocity & aggression and violence. Species range from solitary to complex social groups. There are costs and benefits to group living. Increased competition (automatic cost bound to occur in groups) Increased risk of exploitation of parental care: food, mates, resources, cuckoldry, brood parasites. Reduction in predator pressure: improved detection/vigilance, group defense, dilution effect/selfish herd (less likely to be preyed upon) Detection of clumped (but absent in other areas)/ephemeral food resources. Improved defense of resources (food that is ripe at a certain time/short time: group territoriality. Communal care of young: feeding and/or protection, deter infanticide. All benefits depend on type of behavioural interactions among group members. Large variation among species in types of groups. Solitary animals, random interaction (eg. angler fish; periodic mating) Mating pairs vary in stability and duration (mated pair for varying periods. Aggregates due to environmental conditions (species that are in the same of time) area as they use same resources)