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Outline
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Behavioral Ecology
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"Behaviour"
  • Behaviour
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What is Behaviour?
  • Behaviour consists of an animal’s muscular activity that is externally visible
  • But can also be behaviour without movement, such as secreting a sex attractant.
  • We can think of behaviour as what an animal does and how it does it, a definition broad enough to include nonmotor components of behavior such as learning and memory.
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Behavioural Ecology
  • This is the research field that views behaviour is an evolutionary adaptation to the natural ecological of animals.
  • Natural selection will favor behavioural patterns that enhance survival and reproductive success.
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Behaviour has both proximate and ultimate causes
  • Proximate Causation: concerned with the environmental stimuli, that trigger behaviour - mechanistic - “How questions”.
  • Ultimate Causation: concerned with the evolutionary significance of the behavoiur - “Why Questions”.
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Behaviour results both genes and environmental factors
  • The “Nature-versus-nurture issue is not about either/or, it is about how both the genes and the environment influence the development of phenotypes, including behavioural phenotypes.
  • Example: Fischer’s lovebird and Peach-faced lovebirds
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Innate behaviour is developmentally fixed
  • This behaviour is attributed to genetic programming without any environmental influence.
  • How did innate behaviour evolve?
  • Performing certain behaviours automatically without having any specific experience may have maximized fitness.
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Fixed Action Patterns (FAP)
  • Ethnology- naturalists tried to understand how animals behave in their natural habitats.
  • Karl von Frish, Konrad Lorenz, Niko Tinbergen
  • FAP - a sequence of behavioural acts that is essentially unchanged and usually carried to completion once initiated.
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"FAP are triggered by an..."
  • FAP are triggered by an external sensory stimuli known as ”sign stimuli”.
  • Three-spined stickleback fish.
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"Konrad Lorenz - grey-lag geese..."
  • Konrad Lorenz - grey-lag geese egg retrieval behaviour.


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Directed movements
  • Kinesis and taxis.- These are the simplest mechanisms of movement.
      • Kinesis is a change in activity rate in response to a stimulus - For example, sowbugs are more active in dry areas and less active in humid areas.
      • Taxis is an automatic, oriented movement to or away from a stimulus. - For example, phototaxis, chemotaxis, rheotaxis and geotaxis.
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"Migration Behavior"
  • Migration Behavior.
    • Migration is the
      regular movement
      of animals over
      relatively long
      distances.
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Animal Signals and communication
  • Defining animal signals and communication.
    • A signal is a behavior that causes a change in the behavior of another animal.
    • The transmission of, reception of, and response to signals make up communication.
    • Examples include the following:
      • Displays such as singing, and howling.
      • Information can be transmitted in other ways, such as chemical, tactile, electrical.
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Visual Displays
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Chemical Communication
    • Pheromones are chemicals released by an individual that bring about mating and other behaviors.
      • Examples include bees and ants.
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"Auditory communication"
  • Auditory communication
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"The Dance of the
Honeybee"
  • The Dance of the
    Honeybee.
    • Bees forage to maximize their food intake.
    • If an individual finds a good food source, it will communicate
      the location to others in the hive through an elaborate dance.
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"Learning"
  • Learning
  • The modification of behavour based on specific experiences.
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Imprinting
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Imprinting
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"Spatial Learning"
  • Spatial Learning


  • Niko Tinbergan’s experiments on the digger wap’s nest-locating behaviour.
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Associative Learning
  • Classical conditioning - learning to associate and arbitrary stimulus with a reward or punishment. - Ivan Pavlov.
  • Operant conditioning - trail and error learning.
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 Practice and exercise may explain the ultimate bases of play
  • Play as a behavior has no apparent external goal, but may facilitate social development or practice of certain behaviors and provide exercise.
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Cognition and Problem solving
  • Animal cognition is an animal’s ability to be aware of and make judgments about its environment.
  • Cognition is the ability of an
    animal’s nervous system to
    perceive, store, process, and
    use information gathered
    by sensory receptors.
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Environmental influences on behavoiur
  • Cost-Benefit Analysis of Foraging Behaviour
  • Optimal foraging theory - an animal’s foraging behaviour is a compromise between feeding costs and feeding benefits
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"Bass will eat minnows or..."
  • Bass will eat minnows or crayfish
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Behaviour in an evolutionary context
  • Social behavior is any kind of interaction between two or more animals, usually of the same species.
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Competitive social behaviors often represent contests for resources
  • Sometimes
    cooperation occurs.
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"Agonistic behavior is a contest..."
  • Agonistic behavior is a contest involving threats.
    • Submissive behavior.
    • Ritual: the use of symbolic activity.
    • Generally, no harm is done.
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"Reconciliation behavior often happens between..."
      • Reconciliation behavior often happens between conflicting individuals.
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"Dominance hierarchies involve a ranking..."
  • Dominance hierarchies involve a ranking of individuals in a group (a “pecking order”).
    • Alpha, beta rankings exist.
      • The alpha organisms control the behavior of others.
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"Territoriality is behavior where an..."
  • Territoriality is behavior where an individual defends a particular area, called the territory.
    • Territories are typically used for feeding, mating, and rearing young and are fixed in location.
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"Drawbacks are that territoriality uses..."
    • Drawbacks are that territoriality uses a great deal of an individual’s energy.
      • In addition, an individual might be defending a territory and die or miss a reproductive opportunity.
    • Spraying behavior is where an individual marks its territory.
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Natural selection favors mating behavior that maximizes the quantity or quality of mating partners
  • Courtship behavior consists of patterns that lead to copulation and consists of a series of displays and movements by the male or female.
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"Parental investment refers to the..."
  • Parental investment refers to the time and resources expended for raising of offspring.
    • It is generally lower in males because they are capable of producing more gametes (which are also smaller), therefore making each one less valuable.
    • Females usually invest more time into parenting because they make fewer, larger gametes, a process which is energetically more expensive, thus making each gamete more valuable.
    • In terms of mate choice, females are usually more discriminating in terms of the males with whom they choose to mate.
      • Females look for more fit males (i.e., better genes), the ultimate cause of the choice.
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"Mating systems differ among species"
  • Mating systems differ among species.
    • Promiscuous: no strong bond pairs between males and females.
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"Monogamous"
    • Monogamous: one male mating with one female.

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"Polygamous"
  • Polygamous: an individual of one sex mating with several of the other sex.
      • Polygyny is a specific example of polygamy, where a single male mates with many females.
      • Polyandry occurs in some species where one female mates with several males.

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"Certainty of paternity can influence..."
  • Certainty of paternity can influence mating systems and parental care.
    • If the male is
      unsure if offspring
      are his, parental
      investment is
      likely to be lower.
    • Exceptions do
      exist.
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The concept of inclusive fitness can account for most altruistic behavior
  • Most social behaviors are selfish, so how do we account for behaviors that help others?
    • Altruism is defined as behavior that might
      decrease individual fitness, but increase the fitness of others.
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"Inclusive fitness"
    • Inclusive fitness: How can a naked mole rat enhance its fitness by helping other members of the population?
      • How is altruistic behavior maintained by evolution?
      • If related individuals help each other, they are in affect helping keep their own genes in the population.
      • Inclusive fitness is defined as the affect an individual has on proliferating its own genes by reproducing and helping relatives raise offspring.
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"Hamilton’s Rule and kin selection"
    • Hamilton’s Rule and kin selection.
      • William Hamilton proposed a quantitative measure for predicting when natural selection would favor altruistic acts.
      • Hamilton’s rule states that natural selection favors altruistic acts.
      • The rule is as follows:
      • rB > C
      • The more closely related two individuals are, the greater the value of altruism.


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"The three key variables"
  • The three key variables
    are as follows:
    • B is the benefit to the recipient
    • C is the cost to the altruist
    • r is the coefficient of
      relatedness, which equals the probability that a particular gene present in one individual will also be inherited from a common parent or ancestor in a second individual
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"Kin selection is the mechanism..."
    • Kin selection is the mechanism of inclusive fitness, where individuals help relatives raise young.
    • Reciprocal altruism, where an individual aids other unrelated individuals without any benefit, is rare, but sometimes seen in primates (often in humans).
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Sociobiology connects evolutionary theory to human culture