ZOOLOGY 260 Lecture Notes - Lecture 4: Robert Trivers, Sibling Rivalry, Reciprocal Altruism
2 Feb 2017
School
Department
Course
Professor
Document Summary
Investment in current offspring reduces effort available for future reproduction (conflict) Give food/resources to offspring most likely to survive. Parents may not intervene if this benefits them. Survival of 1 fit offspring instead of 2 unfit ones. Not just kin selection, unrelated animals help each other too. Ex: pack structure of wolves, complex society of ants, wasps, etc. All can shrink and shift, affecting others. Natural selection/evolutionary change stronger when struggle for reproduction is more intense in a place and time. Competition intensifies between species when niches overlap greatly. Competition within a species is (usually) more intense than between species. When losing in comp, organisms abandon or lose part of niche.
