lecture 15

lecture 15 - Animal Behavior Types of behavior Inheritance...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Animal Behavior • Types of behavior • Inheritance of behaviors • Selection on behaviors – Foraging – Reproduction – Social Behavior • Sexual selection – Male-male comptetion – Female choice • Altruism Animals behave Do plants behave? ht p:/ plantsinmotion.bio.indiana.edu/plantmotion/movements/nastic/mimosa/strongmimosa.html Proximate vs. Ultimate Causes of a Behavior • Behavioral ecologists distinguish between proximate and ultimate causes of behavior – Proximate causes: the immediate stimulus and mechanism for the behavior (proximate) – Ultimate causes: How the behavior contributes to survival and reproduction (ultimate) Some behaviors are hard-wired • A fixed action pattern (FAP) – Is a sequence of unlearned, innate behaviors that is unchangeable – Once initiated, is usually carried to completion • A FAP is triggered by an external sensory stimulus – Known as a sign stimulus • In male stickleback fish, the stimulus for attack behavior – Is the red underside of an intruder Figure 51.3a (a) A male three-spined stickleback fish shows its red underside.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
• When presented with unrealistic models As long as some red is present, the attack behavior occurs Figure 51.3b (b) The realistic model at the top, without a red underside, produces no aggressive response in a male three-spined stickleback fish. The other models, with red undersides, produce strong responses. • Proximate and ultimate causes for the FAP attack behavior in male stickleback fish Figure 51.4 ULTIMATE CAUSE: By chasing away other male sticklebacks, a male decreases the chance that eggs laid in his nesting territory wil be fertilized by another male. BEHAVIOR: A male stickleback fish at acks other male sticklebacks that invade its nesting territory. PROXIMATE CAUSE: The red bel y of the intruding male acts as a sign stimulus that releases aggression in a male stickleback. Some behaviors have a learning component • Imprinting is a type of behavior – That includes both learning and innate components and is generally irreversible • Imprinting is distinguished from other types of learning by a sensitive period – A limited phase in an animal’s development that is the only time when certain behaviors can be learned • Konrad Lorenz showed that – When baby geese spent the first few hours of their life with him, they imprinted on him as their parent • There are proximate and ultimate causes for this type of behavior Figure 51.5 BEHAVIOR: Young geese follow and imprint on their mother. PROXIMATE CAUSE: During an early, critical developmental stage, the young geese observe their mother moving away from them and calling. ULTIMATE CAUSE: On average, geese that follow and imprint on their mother receive more care and learn necessary skills, and thus have a greater chance of surviving than those that do not follow their mother. • Conservation biologists have taken
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/01/2010 for the course BIO BILD 3 taught by Professor Christopherwills during the Fall '10 term at UCSD.

Page1 / 12

lecture 15 - Animal Behavior Types of behavior Inheritance...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online