Behavioral Biology Class 19. Behavior What do you understand by behavior? Learning Animal...
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Transcript of Behavioral Biology Class 19. Behavior What do you understand by behavior? Learning Animal...
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What do you understand by behavior?What do you understand by behavior?
Learning Animal cognition Migratory behavior Ecology Reproduction
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Behavior: the way an animal responds to stimulus in its environment
Two components of behavior◦ Immediate cause◦Evolutionary origin
Proximate causation:“how” of behavior◦Measure: hormone level - testosterone◦ Impulse of nerve signal
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Ultimate causation: “why” of behavior Determine how behavior influences reproductive
success or survival
Controversy: ◦ Is behavior determined by individual’s genes◦Or by learning and experience
Nature ((instinct) or nurture (experience)(experience)
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Innate behavior: instinctiveinstinctive, does not require learning◦Preset paths in nervous system◦Genetic: fixed action patternExample: goose replacing an egg from her nest
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Egg retrieval behavior is triggered by a sign stimulus
Innate releasing mechanism or fixed action pattern is the stereotyped act
Not very specific: anything round will trigger the goose’s reaction
Once pattern begins, it goes to completion; even if the egg is removed
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Artificial selection data has shown that behavioral differences among individuals often result from genetic differences
Genetics of learning
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Human twin study Identical twins: identical
genetically 50 sets, twins raised
separately◦ Similarity in personality,
temperament, leisure time activities
Indicates that genetics plays a role in determining behavior in humans,
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Learning: altered behavior as a result of previous experiences
Nonassociative learning: does not require an animal to form an association between two stimuli or between a stimulus and response◦Habituation: decrease in response to a repeated
stimulus◦No positive or negative consequences
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Associative learning: association between two stimuli or between a stimulus and a response
◦Conditioned behavior through association◦ Two major types:
Classical conditioning Operant conditioning
◦Differ in the way associations are established
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Classical conditioning: the paired presentation of two different kinds of stimuli with an association formed between them◦ Ivan Pavlov:◦ Pavlovian conditioningPavlovian conditioning
Unconditioned stimulus: meat
Unconditioned response: salivating
Conditioned stimulus: bell ringing
Conditioned response: After time, the dog salivates with only the ringing of the bell
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animal learns to associate its behavior response with a reward or punishment◦ B.F. Skinner◦ Trial and error learning
Today it is believed that instinct guides learning by determining what type of information can be learned through conditioning
Learning: Operant conditioning
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Parent-offspring interactions influence cognition and behavior
Imprinting:Imprinting: formation of social attachment to other individuals or develop preferences that will influence behavior later in life
Filial imprinting:Filial imprinting: attachment between parents and offspring
Konrad LorenzNoble Price 1973
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Instinct and learning may interact as behavior develops
◦ White-crowned sparrow males sing species-specific courtship song during mating
◦ Genetic template: innate program to learn the appropriate song
◦ Can not learn the song unless they hear it at a critical period critical period in developmentin development
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Chimps pull the leaves of off a tree branch to use it as a tool for picking termites
Some birds learn to take off milk caps from bottles
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Orientation: goal-oriented movements◦ Track stimuli in the environment◦Homing instinct◦ Taxis: movement toward or away from a
stimulus◦Kineses: more or less active when
stimulus intensity increases
Migration involves population moving large distances: Monarch butterflies fly from North America to Mexico
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Migrating animals must be capable of orientation and navigation
Navigation: the ability to set or adjust a bearing ◦Sun and stars: general direction◦Earth’s magnetic field: specific
path◦ Information from the stars
overrides the magnetic information if they conflict
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Communication can play a key role in behaviors◦Among members of the same species◦Between species
Successful reproduction depends on appropriate signals and responses◦Stimulus-response chain: behavior of one behavior of one
individual releases a behavior by another individual releases a behavior by another individualindividual
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Communication facilitates group living◦ Guards: set off an alarm call so group can
seek shelter◦ Social insects produce pheromones that
trigger attack behavior◦ Ants deposit trail pheromones between nest
and food source
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Primate language:Vocabulary to communicate identity of specific predators
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Chimpanzees and gorillas can learn to recognize a large number of symbols and use them to communicate abstract concepts
Complexity of human language◦ Differences are superficial◦ 3000 languages draw from the same
set of 40 consonant sounds
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Behavioral ecology: study of how natural selection shapes behavior◦Adaptive significance of behavior◦Reproductive success, fitness
Questions asked◦ Is behavior adaptive◦How is it adaptive
Enhance energy intake, Enhance energy intake, increase mating successincrease mating success, , decrease predationdecrease predation
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Evolutionary analysis: survival value of behavior
Tinbergen observed gull nestlings hatch and parents remove the shells of the eggs
Placed broken eggs by the nests◦ Predators (crows) found nests
with broken eggs and ate the hatchlings
◦ Nests without egg shells had less predation
Nobel Price 1973- shared with Lorenz
Focus on:DevelopmentPhysiological basisFunction: including evolutionary significance
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Foraging behavior can directly influence individual fitness
Foraging involves a trade-off between food’s energy content and the cost of obtaining the food
Optimal foraging theory: natural selection favors individuals whose foraging behavior is energetically efficient
Optimal foraging assumes that:Behavior maximizes energyBehavior maximizes energy
acquisition if the increased energy reserves lead to increases in reproductive success i.e.Avoid predators, Find matesAvoid predators, Find mates
Optimal behavior has evolved by natural selection
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Reproductive strategies: decisions about mating
◦How many mates to have◦How much time devoted to rearing offspring◦How much energy devoted to rearing offspring
Evolved partly in response to cost of reproduction
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Mating systems reflect adaptations for reproductive success
Energy costs, food resources, nest sites, distribution of opposite sex
Mating systems◦Monogamy: one male one female◦Polygyny: one male many females◦Polyandry: one female many males
Sexual Selection
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Altruism: the performance of an action that benefits another individual at a cost to the actor
Question: if altruism imposes a cost to an individual, how could an allele be favored by natural selection?
Group selection: rare◦Among groups: leads to a decrease in allele’s frequency◦Within groups: may favor the allele
Altruism
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Society: a group of organisms of the same species that are organized in a cooperative manner
Advantages◦Kin selection: greater odds of alleles surviving in the
gene pool◦Greater protection from predators◦ Increase feeding and mating success
Social Systems