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- 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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- 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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- 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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- 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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- 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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- 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 external sensory stimuli known as ”sign
stimuli”.
- Three-spined stickleback fish.
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- Konrad Lorenz - grey-lag geese egg retrieval behaviour.
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- 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 is the
regular movement
of animals over
relatively long
distances.
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- 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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- Pheromones are chemicals released by an individual that bring about
mating and other behaviors.
- Examples include bees and ants.
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- 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
- The modification of behavour based on specific experiences.
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- Spatial Learning
- Niko Tinbergan’s experiments on the digger wap’s nest-locating
behaviour.
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- 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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- 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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- 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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- 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 crayfish
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- Social behavior is any kind of interaction between two or more animals,
usually of the same species.
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- Sometimes
cooperation occurs.
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- 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 conflicting individuals.
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- 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 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 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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- 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 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.
- Promiscuous: no strong bond pairs between males and females.
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- Monogamous: one male mating with one female.
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- 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 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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- 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: 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.
- 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
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 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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