W.D. Hamilton (1936-2000) Kin selection theory.

Slides:



Advertisements
Similar presentations
Social Behavior Members of the same species Usually live full-time in groups Can refer to predator-prey interactions.
Advertisements

Social Behaviour Learning outcomes
Insect Societies Lecture 21.
Evolution of the Family Evolution by Kin Selection Genetic Trait Expressed in Actor (Ego) Must Affect Genotypic Fitness of Individual Related to Actor.
VI. Levels of Selection Selection can occur wherever there is differential reproduction among variable entities. A. Gene Selection 1. Meiotic Drive: -
Animal Interactions Responses to the biotic environment.
Helpful behaviour. Helpful behaviour Helpful behaviour.
Social Behaviors: Altruism to Spite. Social Behaviors Animals often cooperate with each other – But in most cases this cooperation is mutually beneficial.
The eusocial insects: Isoptera: Termites Hymenoptera: Ants, bees, wasps.
Social Insects Psychology Introduction Many Insects live in hives, nests or what have you Definite roles for different castes, usually only one.
Chapter 13 Opener: Weaver ants form superbly cooperative societies
Chapter 13: Evolution of Social Behavior  Costs and benefits of Social Life.  There are a large number of possible costs and benefits associated with.
Diversity of reproduction Asexual reproduction Parthenogenesis Hermaphrodites Sequential hermaphrodites - protogyny (F  M) or protoandry (M  F) Sexual.
Sociality and Social Behaviour. Level of Sociality Mating strategy Communication System Kin Selection Altruism Predator Pressure Resource Defence Parental.
1 Kin Selection and Social Behavior Chapter Types of social interactions among members of the same species (Table 11.1) The actor in any social.
Recipient/Donor Effects Non-Kin and Relatives. Kin Selection Question: Reproductive Altruism Eusocial Insects Reproductive, Worker Castes Cooperative.
Types of Social Interactions Cooperation = mutualism Cooperation = mutualism – Fitness gains for both participants Altruism Altruism – Fitness gain for.
Kin Selection and Social Behavior. I. Motivation Cooperative behaviors are widespread. Why?
Altruism: Voluntary or Coerced? Altruism Requires Decrease Actor’s Direct Fitness Increase Recipient’s Direct Fitness Social Insects Eusociality  Sterile.
Categories of Social Behavior
Chapter 13 Opener: Weaver ants form superbly cooperative societies
Lecture 5: Unit of Selection Who/what benefits from adaptation? Nucleotide – Gene – Cell – Organism – Group – Species What is the unit of selection? Can.
2 WORK-STUDY JOBS 1. Endangered species and biodiversity Duties: - collect data on endangered species traits - enter data into Access database 2. Plant-insect.
Chapter 13: Evolution of Social Behavior
W.D. Hamilton ( ) Kin selection theory.
Eusociality Conflicts over reproduction Definition and occurrence
BIOE 109 Summer 2009 Lecture 9- Part II Kin selection.
Darwin’s Puzzle: Why are Males and Females Different?
Kin Selection and Social Behavior
Types of Social Interactions
Sociality and the adaptive value of helpful behavior
Behavioral Ecology Photo from Wikimedia Commons. Ethological Underpinnings of Behavioral Ecology Photo from Konrad Lorenz.
Announcements Exam 3 - this Friday, April 27th (M-Z here; A-L 100 Greg Hall) Final - Friday May 11, 8am (A-L here; M-Z 100 MSEB) Conflict exam for final.
Behavioral Ecology Introduction Social behavior Sexual selection.
Living in groups also has benefits and costs.
Ch51 Behavior Ecology. Behavioral ecology is the study of the ecological and evolutionary basis for animal behavior.
Units of Selection. We think that the only way that adaptations can arise is through natural selection. The effects of such adaptation can be seen at.
Force favoring aggregation protection from physical factors hydrodynamic effects - birds & fish reduce predation pressure: group defense, vigilance, dilution,
Mating Systems & Social Behavior
Hamilton’s Rule – Kin Selection. KIN SELECTION & ALTRUISM Kin Selection: selection of a trait through helping relatives, either 1.descendant kin (offspring):
CHAPTER 51 BEHAVIORAL BIOLOGY Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section D2: Social Behavior and Sociobiology (continued)
Take home final exam April 29 th DUE: May 5 th in my office by 1pm 1100 to 1300All classes meeting at 0800 or 0830MWF Exam format How many: MC? (50%) Short.
10. Cooperation and Helping. Inclusive Fitness Direct Fitness (Individual Fitness): personal reproductive success measured as the number of offspring.
Kin selection. actor +- + cooperativealtruistic - selfishspiteful recipient Individual interaction behaviors.
Announcements. Recipient’s fitness Actor’s fitness increases decreases Cooperation AltruismSpite Selfishness Types of social action.
1 Approaches to the Study of Behavior __________can be defined as the way an organism responds to stimuli in its environment. Is behavior learned or genetic?
Chapter 35 Behavioral Ecology. Define behavior.  Behavior encompasses a wide range of activities.  A behavior is an action carried out by muscles or.
Social interactions between organisms present the opportunity for conflict and cooperation Interaction between individuals can have 4 possible outcomes.
Chapter 51 Population Ecology. Define behavior. Visible result of an animal’s muscular activity ▫When a predator catches its prey ▫Fish raises its fins.
SOCIALITY IN INSECTS.
Social behaviour Biol 455 Mammalogy March 29, 2005.
1) Relatedness “r” A) means degree of shared genetic similarity among relatives over-and-above the baseline genetic similarity within a population B) ranges.
Announcements. Eusociality Reproductive division of labor (sterile workers). Overlapping generations. Cooperative brood care. Examples include: Hymenoptera.
Kin Selection and Social Behavior. I. Motivation Cooperative behaviors are widespread. Why?
Behavioral Ecology. Important concepts: Fixed action patterns (FAP’s) Imprinting Kinds of learning: Classical Operant Inclusive fitness and altruism.
Running with the Red Queen Why is there sexual reproduction?
Classical Kin Selection. Kin Selection Kin Selection  Natural Selection Fitness: Lifetime Reproductive Success Inclusive Fitness Direct & Indirect Components.
Animal Behavior All things an animal does And How it does them.
Animal Behavior Why do they DO that?! Sections
Promiscuity and the evolutionary transition to complex societies C. Cornwallis, S. West, K. Davis & A. Griffin Nature; 2010.
How did eusociality originate?
What do these have in common?
Living in groups also has benefits and costs.
Altruism.
Characteristics of eusocial societies
Alturistic Social Behaviors
Survival Tactics 101.
Living in groups also has benefits and costs.
Inclusive Fitness Vivian Hubby.
Conceptual Challenges and Directions for Social Neuroscience
Presentation transcript:

W.D. Hamilton (1936-2000) Kin selection theory

Kin Selection & Hamilton’s Rule Altruism is favored when: rB - C > 0 or C/B > r r = relatedness between altruist and recipient B = fitness benefit to recipient C = fitness cost to the altruist

Eusociality Species that live in colonies of overlapping generations One or a few individuals produce all the offspring and the rest serve as functionally sterile helpers in rearing young and protecting the colony Division of labor Reproductive castes

The Naked Mole-Rat: A Eusocial Mammal

Division of labor and reproductive hierarchy

Coral Snake and Scarlet King Snake Can you tell the difference???

Viceroy and Monarch Butterflies Predators need only encounter one form to shun both.

The Cuckoo - A Brood Parasite

Garter Snakes

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.