BIOC54H3 Chapter Notes - Chapter 12: Intraspecific Competition, Sunk Costs, Parental Investment
17 Oct 2011
School
Department
Course
Professor
Document Summary
Physiological costs sustained energy cost: future reproduction and survival, opportunity costs foraging and matings. Parental care evolves if there is a net fitness increase. Factors which affect cost and benefit of environment: environmental, k selected: stable environment, large body size, slower development, longer lifespan. (quality) intraspecific competition. Small # of young that receive care. Parental strategy: intelligent, autonomous expensive offspring: learning and physical abilities benefit of parental investment increase in success of young. Example: monkeys flexible behaviour, behaiour repertoire, social system, develop brain: african dogs social system, group hunting, r selected: fluctuating environment, smaller body size, rapid development, shorter lifespan (quantity) Semelparity: production of offspring once/few in a lifetime. Large # of young that receive little to no care. Parental strategy: large # of cheap offspring some survive: low benefit of parental involvement. Eresid spiders: 100 of offspring and high offspring mortality r selected, spider adult longevity 1 summer low rrv, suicidal maternal care offspring feed on mother low rrv.
