Behavioral Ecology Lecture Review

Behavioral ecology is the field that studies animal behavior and how it is influenced by various factors including development, evolution, survival, and reproductive success of species.
Example: Cranes migrate thousands of kilometers from their wintering grounds in North Africa and North America to northern nesting grounds every spring.
- They stop along the way to rest and feed, as well as call to each other during migration.
Key questions addressed by behavioral ecologists:
  - Why do migrating cranes call during migration?
  - What environmental cues trigger migration?
  - How does migration affect the reproductive success of cranes?
Behavioral ecology is crucial for solving important problems, ranging from conservation of endangered species to controlling emerging infectious diseases.

The study of behavior often revolves around two central types of questions:
1. Mechanistic questions: These inquiries describe how an animal is biologically organized to carry out specific behaviors.
2. Survival value questions: These inquiries describe how behaviors help animals exploit resources, avoid predators, or secure mates.
It is recognized that behavior has at least a partial genetic basis, particularly in relation to environmental stimuli.

Research on two different populations of snakes reveals genetic influences on behavior:
  - Aquatic Snakes:
    - Primarily feed on underwater frogs and fish.
    - Show a refusal to eat slugs.
  - Coastal Snakes:
    - Live on land and mainly consume slugs.
    - Possess odor receptors on the roof of the mouth; utilize tongue flicks to recognize prey.
Hybrid snakes display an intermediate incidence of slug acceptance, suggesting the influence of genetic factors.

Studies on separated human twins also indicate a genetic basis for behavior, demonstrating that twins raised in different environments can still show similar food preferences and activity patterns.

Some behaviors are categorized as stereotyped, consistently performed in the same manner known as Fixed Action Patterns (FAP).
- FAPs are originally thought to be elicited in response to a sign stimulus; for example, babies smile at a mask resembling a human face.
Modern research proposes that many behaviors once thought to be FAPs develop through practice (affected by learning).

The feeding (pecking) behavior in Laughing Gull chicks, Larus atricilla, is dependent on developmental learning.
- At around three days old, chicks begin to peck at the beak of their parents to induce regurgitation of food.

Associative Learning: A behavioral change resulting from the association between two events.
- Example: Birds that fall ill after eating monarch butterflies learn to avoid them even when available.
Classical Conditioning: Involves pairing two different types of stimuli simultaneously, resulting in learned associations.
- Example: Ivan Pavlov’s dog experiment where a bell (conditioned stimulus) was associated with food (unconditioned stimulus), leading to salivation (conditioned response) even without food present.
Key Definitions:
- Unconditioned Response: A natural reaction (e.g., salivation at the sight of food).
- Conditioned Response: A learned reaction (e.g., salivation at the sound of the bell).

Involves strengthening a stimulus-response connection through reinforcement (reward).
  - Providing rewards (e.g., food or affection) reinforces desired behaviors.
  - Example: Skinner's rat experiment where pressing a lever led to sugar rewards, establishing a conditioned behavior.
  - Implication: Positive reinforcement is generally more effective than punishment in shaping behavior.

Sexual selection results in distinct male and female traits, often through mate choice and competition.
Example: The Raggiana bird of paradise exhibits sexual dimorphism, with males displaying vibrant plumes during courtship.
  - Key questions regarding sexual selection:
    1. Do the plumes signify health?
    2. Do females prefer flamboyant males for the benefit of producing attractive sons?
    3. Do extravagant male features correlate with lower parasite loads?
  - Research shows males raised in parasite-controlled environments (with mite spray) develop longer tails, which females prefer.

Communication among animals varies, reflecting their social structures and cooperative behaviors.
Definition: Communication is an action by a sender that influences the behavior of a receiver.

Auditory Communication:
   - Used by bats through sound pulses to navigate and hunt.
   - Evasive tactics in moths triggered by these sound emissions indicate predator-prey interactions.
   - Effectiveness arises from loudness, pattern, duration, and repetition.
Chemical Communication:
- Pheromones: Chemical signals exchanged within a species for communication.
- Female moths secrete unique pheromones detected by males.
Visual Communication:
- Often employed during daylight, seen in species like the Raggiana bird.
Tactile Communication:
- Touch signals, such as gull chicks pecking at parents to solicit feeding.
- The waggle dance of bees combines tactile, auditory, and visual cues to indicate food sources.

The waggle dance relays information about the distance and direction of food sources.
- Performed as two loops creating a figure-eight pattern; the orientation relates to gravity and the sun’s position, guiding hive members to food.
Figure Overview:
- Outside hive: Dance indicates direction to food.
- Inside hive: Angle of dance correlates with the angle of the food source relative to the sun's angle.