Bio - Animal Behavior
Introduction to Ethology and Inherited Behaviors
Ethology Definition: The scientific study of animal behaviors. These behaviors are generally categorized based on whether they are inherited (innate) or learned through experience.
Inherited (Innate) Behaviors: These are behaviors that are genetically programmed into an organism and do not require prior experience to perform.
Instincts: Innate behaviors that occur naturally without the need for conscious thought.
Named Example: Birds migrating in direct response to seasonal changes is a classic example of an instinctual behavior.
Detailed Classification of Reflexes
Reflexes: Involuntary and rapid responses to a specific stimulus. These are managed by neural circuits known as reflex arcs.
Simple Reflexes: These represents the most rapid type of reflex response.
Pathway: Sensory neurons transmit information from the stimulus directly to the spinal cord (the Central Nervous System or CNS).
Synaptic Action: In the spinal cord, the sensory neuron synapses directly onto motor neurons.
Execution: The motor neurons then travel immediately to the muscle to trigger the response.
Complex Reflexes: These are slower than simple reflexes because they involve more complex neural pathways.
Functional Difference: Sensory and motor neurons in a complex reflex are separated by an interneuron.
Brain Involvement: These pathways may also include a connection to the brain for further integration, unlike the simple reflex arc which prioritizes speed through the spinal cord.
Fixed Action Patterns and Imprinting
Fixed Action Patterns (FAPs): A specific category of instinct involving hardwired actions initiated by a specific stimulus, known as a releaser.
Completion Characteristic: Once a fixed action pattern is initiated, the animal will continue the behavior to its completion even if the original stimulus is removed during the process.
Consistency: These result in predictable and appropriate behaviors that do not require learning.
Flexibility: Fixed action patterns are notably neither flexible nor Kathy adaptable.
Named Examples:
A goose rolling eggs back into its nest.
Male insects attacking other males with red bellies.
Imprinting: An innate method by which animals learn specific behaviors that are never forgotten once acquired.
Timing: This occurs only during a specific window of time called the critical period or the critical imprinting stage.
Learned Behaviors and Conditioning
Goal of Learned Behaviors: These behaviors increase an animal's fitness by allowing it to adapt to unexpected or changing environmental events.
Classical Conditioning: This involves pairing a neutral stimulus (which initially elicits no physiological response) with an unconditioned stimulus (which naturally elicits an unconditioned response).
Process: Over time, the unconditioned response becomes mentally associated with the neutral stimulus.
Result: The neutral stimulus becomes a conditioned stimulus, which then triggers a conditioned response.
Stimulus Generalization: This occurs when a conditioned animal responds to stimuli that are similar to, but not identical to, the original conditioned stimulus.
Explanatory Example: A dog salivating in response to a doorbell because the sound is similar to the bell used during its conditioning.
Stimulus Discrimination: The ability of an animal to differentiate between the specific conditioned stimulus and other similar but different non-conditioned stimuli.
Operant Conditioning: A form of learning where an animal associates a specific behavior with either a reward or a punishment.
Reward: Increases the frequency of the behavior.
Punishment: Decreases the frequency of the behavior.
Associative and Non-Associative Learning
Associative Learning: The process of learning that two things are connected to each other, which serves to increase the efficiency of a stimulus response.
Extinction: These associations can be forgotten if the connection is no longer reinforced.
Re-association: Associations can be remembered or established again through further experience.
Non-Associative Learning: A change in the behavioral response to a stimulus that is NOT associated with a reinforcement (reward) or punishment.
Sensitization: An increase in behavioral response as the stimulus occurs more frequently.
Habituation: A decrease in behavioral response when exposed to a repetitive, meaningless stimulus.
Animal Movement and Communication Patterns
Kinesis: A change in movement speed in a random direction with no specific target.
Environmental Response: In favorable environments, the animal reduces its speed. In unfavorable environments, the animal increases its speed.
Taxis: Movement with a specific direction relative to a stimulus.
Positive Taxis: Movement toward a stimulus.
Negative Taxis: Movement away from a stimulus.
Phototaxis: Movement in response to a light stimulus.
Chemotaxis: Movement in response to a chemical stimulus.
Pheromones: Chemical signals released by organisms to communicate with others of the same species. These can often act as the stimulus for chemotaxis.
Migration: Long-distance movement from one location to another. This is often seasonal and driven by instinct.
Social Behaviors and Interactions
Social Behavior Overview: These behaviors allow for interaction for the purposes of companionship, finding food, protection, and mating.
Cooperation: The act of animals grouping together to better achieve a specific goal.
Agonistic Behaviors: Behaviors related to competing for food, territory, or mates.
Components: Includes threats, aggression, and submission.
Aggression: Often detrimental to both parties involved.
Appeasement Behavior: When an animal feels threatened, it may submit to avoid aggression and prevent physical injuries.
Dominance Hierarchy: Also known as a "pecking order."
Alpha Male: The top-ranked male in the hierarchy.
Territoriality: Specific behaviors used to protect an animal's safe space or territory.
Methods: Employing watchers and defenders, or using pheromones to scare off intruders.
Fitness, Altruism, and Inclusive Fitness
Altruistic Behaviors: Sacrifices made by an individual for the benefit of its relatives.
Inclusive Fitness: The sum of an animal’s direct and indirect fitness.
Direct Fitness: The genes an animal passes on to its own offspring.
Indirect Fitness: The genes passed on by an animal's relatives.
Kin Selection: The process by which animals use altruism to help their relatives survive, thereby increasing their indirect fitness and, consequently, their total inclusive fitness.
Sexual Selection and Mating Behaviors
Sexual Selection: The study of how males and females differ in mating behaviors to maximize their overall fitness.
Female Strategies:
Invest more energy into the mating process.
Select high-quality males to increase the likelihood of producing quality offspring.
Female Choice: Leads to the increase of attractive traits in males.
Male Strategies:
Contribute less energy to the mating process.
Focus on producing a high quantity of offspring.
Male Competition: Rewards the strongest or most capable males with more mating opportunities.
Sexual Dimorphism: A condition where males and females of the same species exhibit different physical characteristics (e.g., males being larger than females).
Mating Systems and Reproductive Strategies
Monogamy: Having only one mating partner at a time.
Polygamy: Having multiple mating partners at the same time.
Semelparity: A reproductive strategy where an organism mates only once in its lifetime.
Offspring Profile: Produces multiple offspring at once.
Environmental Context: Often occurs in harsh conditions.
Parental Care: No parental care is provided, leading to low survival rates for the individual offspring.
Iteroparity: A reproductive strategy where an organism mates many times throughout its lifetime.
Offspring Profile: Typically produces only one offspring at a time.
Environmental Context: Occurs in more dependable environments.
Parental Care: Features significant parental care, leading to high survival rates for the offspring.