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Intro. to Behavioral Ecology
Behavioral Ecology
1.
Define behavioral ecology
a.
The study of how organisms respond to particular biotic and abiotic stimuli in their environment
2.
Types of Behavior
a.
Movement & Migration (innate)
b.
Living in Groups (innate)
c.
Simple Learned Behavior
d.
Conditioned Behavior
e.
Cognitive Learning
3.
Describing
behavior
a.
Innate vs. Learned
b.
Fixed vs. Flexible
4.
Understanding
behavior
a.
Proximate vs. Ultimate
i.
Proximate (mechanistic/how)
1.
What causes the behavior?
2.
What does the organism do in response?
ii.
Ultimate (evolutionary/why)
1.
What about the behavior helps the animal survive/reproduce?
2.
What is the evolutionary history of the behavior?
Innate: Movement & Migration
1.
List types of movement/migration from least to most complex
a.
Reflex
b.
Taxis
c.
Fixed Action Patterns
i.
Behavior
: a male stickleback fish attacks other male sticklebacks that invade its nesting territory
1.
Prox. Cause:
a.
Example
- The red belly of the intruding male acts as a sign
stimulus that releases aggression in a male stickleback
2.
Ulti. Cause:
a.
Example
- By chasing away other male sticklebacks, a male decreases the chance that eggs laid in his nesting territory will be fertilized by another male.
d.
Migration
i.
Behavior
: Long-distance movement of a large number if individuals associated with a change of seasons– Serengeti’s Great Migration
1.
Prox. Cause:
a.
How do animals know when to move on? b.
How do they navigate?
i.
Visual Landmarks
ii.
Sun Compass
iii.
Star Compass
iv.
Magnetic Compass
2.
Ulti. Cause: a.
What are the benefits of multiple “homes” that outweigh the cost of long-distance travel?
i.
Tradeoff between energy expenditure and _____
ii.
Resource (generally food) availability
iii.
A safe location to breed
e.
Foraging
i.
Behavior: searching for and exploiting food resources
1.
Optimal Foraging Theory
a.
Assume animals will optimize efficiency by maximizing the amount of energy taken in given the costs of finding and digesting the food.
2.
Describe fixed action patterns and provide examples of possible proximate and ultimate causes
Migration
1.
Define migration
a.
How do animals migrate
b.
Why do animals migrate? (consider cost/benefit of undertaking such an energetically costly behavior
Foraging
1.
Define foraging
a.
Under what circumstances might different foraging alleles (i.e., more or less foraging) be advantageous?
Living in Groups: Communication
1.
List 4 different modes/types of communication
, with examples
2.
Communication Example: The
Waggle Dance
a.
Proximate Cause
: How/what do animals communicate?
b.
Ultimate Cause
: Why do animals communicate?
3.
Define deceitful communication
:
a.
Singaler attempts to exploit the receiver
i.
Examples: 1.
Hognose snakes play dead to avoid being eaten
2.
Female Photuris fireflies flash the courtship signal of another species and then eat males that respond.
3.
Male fiddler crabs have enlarged “major” claws used in fights and to attract mates– males that lose their major claw regenerate claws that are large, but weak.
ii.
Success is often density dependent
Living in Groups - Altruism
1.
Define altruism
:
a.
behaviors that have a fitness cost to the individual exhibiting the behavior and a fitness benefit to the receiver
b.
Examples:
i.
Cooperative breeding
ii.
Food sharing
iii.
Grooming
iv.
protection
2.
Explain the paradox of altruism
(how does it seem to contradict predictions of natural selection?):
a.
3 ingredients of natural selection
i.
variation
- some individuals behave altruistically, others don’t
ii.
heritability
- altruistic behavior has genetic (heritable) component
iii.
more offspring produced than survive
- struggle for existence
b.
Outcome
: traits of individuals with higher relative fitness increase in frequency over generations. Thus, decrease of altruism alleles could be predicted
3.
Define Kin Selection
:
a.
Selection that acts through benefits to relatives at the expense of the individual
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