Chapter 50- Behavior Ecology

Animal Behavior

Introduction

  • Study of how behaviors evolve and develop in animals, including mechanisms underlying behavior.

Historical Context

Early 20th Century

  • Ivan Pavlov (1900s - physiological backgrounds):

    • Founded experimental psychology.

    • Demonstrated behavioral reflexes can be modified (Nobel Prize, 1904).

  • Key method: Classical conditioning。

Classical Conditioning

  • Conditioned reflex: Normal responses to unconditioned stimuli are paired with artificial stimuli to elicit a response.

  • Example of Pavlov’s dog experiments showing learned behaviors.

B.F. Skinner

  • Studied operant conditioning: animals learn actions via rewards.

  • Founder of radical behaviorism (1930s), claiming free will is an illusion.

  • Pavlov and Skinner's work shaped laboratory-focused future research in behaviorism.

Ethology

  • Founded by Karl von Frisch, Konrad Lorenz, Niko Tinbergen.

  • Focused on studying behaviors in natural environments.

  • Examined evolutionary relationships and adaptations of behaviors.

Fixed Action Patterns

Definitions

  • Instinctive behaviors: performers without learning, stereotypic, genetically determined.

  • Deprivation experiments: Raised species with no learning opportunity, e.g., spiders spinning perfect webs instinctively.

Releasers and Specific Stimuli

  • Fixed Action Patterns are responses triggered by specific stimuli (releasers) like a red dot on gulls’ bills stimulating begging behavior in chicks.

Genetic Influence on Behavior

  • Mating behavior related to single gene mutations influencing distinct phenotypes.

  • Circadian rhythms: 24-hour cycles, controlled by genes like per, key to behavior patterns.

  • Quantitative trait locus (QTL) analysis identifies multiple genes influencing traits.

Hormonal Control of Behavior

  • Hormones dictate behavior expression; different impacts in rats based on sex and treatment (spaying/castration).

  • Hormonal exposure shapes behavior further (e.g., testosterone masculinizing effects).

Development of Behavior

  • Behavior arises from various factors including sensitive developmental periods (e.g., song learning in male songbirds).

  • Parenting recognition enhanced by mechanisms like imprinting, as seen with Konrad Lorenz’s studies showing young birds imprinting on moving creatures like himself.

Learning and Social Behavior

  • Male songbirds learn species-specific songs, crucial for mating success.

  • Social context: Learning is influenced by exposure to environmental cues and interactions, vital for effective communication and mating.

Mating Systems

Types

  • Polygynous Systems: Males have multiple mates; female investment is higher in their offspring's survival.

  • Polyandrous Systems: Females with multiple partners, beneficial for offspring care, presented in certain species (like golden lion tamarins).

Group Dynamics and Altruism

  • Cooperation in groups evident in species defense, hunting, and rearing offspring.

  • Kin selection: Enhances indirect fitness through behaviors benefiting relatives.

  • Hamilton's Rule: Altruism is favored when benefits to recipient (B) times relatedness (r) exceeds cost (C).

Eusociality

  • In honey bees: Non-reproductive roles of sterile females contribute to colony's success.

  • Haplodiploidy system influences reproductive strategies within eusocial societies.

  • Costs of social behavior include competition for resources and disease spread.

Navigation and Environmental Cues

Bionavigation Techniques

  • Piloting: Learning and remembering landmarks for navigation (e.g., gray whales).

  • Homing: Specialized capabilities to return to specific locations (like pigeons).

  • Migration: Seasonal movements optimizing reproduction and survival.

Communication Signals

  • Diverse methods for information exchange, including pheromones, visual signals, and acoustic signals.

  • Each offers unique advantages based on context (e.g., pheromones operating over long distances).

This extensive overview encapsulates the themes of animal behavior evolution, genetic influences, social dynamics, learning processes, and communication mechanisms.