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Behavior Animal Behavior Nervous System Endocrine System Behavior

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Behavior Animal Behavior Nervous System Endocrine System Behavior Behavior Animal Behavior • Observable coordinated responses to stimuli. • Originates with genes that direct the formation of tissues and organs of the animal body (nervous & endocrine systems). Nervous System Endocrine System • Detects processes and integrates • Produces hormones in response to information about stimuli. neural stimuli. • Commands muscles and glands to • Hormones influence behavior. make suitable responses. Behavior is adaptive Starling Nest Decoration • Behavior is heritable and has been • Starlings line nest demonstrated to improve fitness. with wild carrot. • Experiments have shown this behavior is adaptive. Experimental Control nests nests 1 Starling Genes and Behavior • Some variations in behavior have a genetic basis. • Arnold showed that garter snakes’ taste for slugs has genetic basis. • Hybrid snakes showed behavior intermediate between parental types. Garter Snake Hormones and Bird Song Coastal snake eat • Sex hormones produced during slugs, inland snake development prime male birds to sing. do not. Captive newborns • As adults, males will sing only when showed same days are long and levels of the hormone preferences as wild melatonin are low. adults. Cross breeds had intermediate interest. Prairie Voles Hormones Types of Behavior Prairie voles are monogamous mammals. Pair bonding occurs 1. Instinctive during a night of mating. They usually become monogamous for life. During their mating they release oxytocin. 2. Learned If they are together but prevented from mating they will not form a bond. If the female is inject with oxytocin then a bond will form. If bonded females are injected with an oxytocin blocker, she will run off with the next male she sees. 2 Instinctive Behavior Instinctive Behavior • For the Garter snakes, the sign stimuli is the scent of a yummy slug • Performed without having been learned. • The fixed action pattern for the Garter is its • Usually triggered by simple sign stimuli. strike, capture and eating slug. • Response is a stereotyped motor program, a fixed-action pattern. Instinctive Behavior Instinctive Behavior European Graylag goose cuckoos lay eggs continues egg- in nests of other retrieving motion species even after egg is Newly hatched removed cuckoos toss the competitors eggs out of the nest Cuckoos get fed by the mother of the eggs they destroyed Learned Behavior Imprinting • Responses change with experience. • Time-dependent learning. • Some categories of learned behavior • Triggered by exposure to a sign Imprinting Spatial learning stimulus during a sensitive period. Insight learning Habituation Classical conditioning • Young geese imprint on a moving object Operant conditioning and treat it as “mother”. 3 Imprinting Classical Conditioning • First demonstrated by Pavlov. • An autonomic response becomes associated with a novel stimulus. • Salivation became associated with sound of bell that accompanied feeding. Learned Learned Behavior Behavior Classical Conditioning Classical Conditioning Pavlov’s experiments with dogs. Pavlov’s experiments •Unconditioned Stimulus: a with dogs. thing that can already elicit a response. •Unconditioned Response: a thing that is already elicited by a stimulus •Unconditioned Relationship: an existing stimulus- response connection Learned Learned Behavior Behavior Classical Conditioning Classical Conditioning During conditioning After conditioning •Association of a neutral •Neutral stimulus now elicits stimuli with an UCS a conditioned response. produces a UCR. 4 Operant Conditioning Operant Conditioning • A voluntary action becomes associated with its consequences. • A toad may attempt to eat a wasp with a black and gold pattern and be stung. • Thereafter, the toad will be conditioned to avoid eating similar insects. Habituation Spatial Learning • An individual learns NOT to respond to • Through experience with an a stimulus that has neither good nor bad environment, an organism creates a consequences. mental map. • Pigeons in cities learn that people are • Some blue jays remember the location no threat and do not flee from them. of dozens of places where they have stored food. Spatial Learning Insight Learning • An animal solves a problem without trial-and-error attempts at a solution. • Captive chimpanzees show insight learning when they solve a novel problem, as when they stack boxes to reach food that is out of reach. Blue Jay (Cyanocitta cristata) knows where it stashed food. 5 Insight Learning Insight Learning Bananas Bird Song: Instinct + Learning Bird Song: Instinct + Learning • Bird comes prewired to listen to certain • Birds raised in acoustic isolation still acoustical cues; instinctively pays sang as adults, but not exactly the same attention to particular sounds. as typical song. • Which dialect the bird sings depends on • Birds raised with recordings of its native what song it hears; it learns the details songs and that of a different species of the song from others around it. sang the native song. Selection for Behavior Selfish and Altruistic Behavior • Some variation in behavior has a genetic • Selfish behavior promotes an basis. individual’s genes at the expense of others. • Some behavior promotes reproductive success (is adaptive). • Altruistic behavior helps others at the expense of the altruist; may be adaptive • Genes that encode adaptive behavior under certain circumstances. will increase in population. 6 Selfish Ravens Communication Signals • Heinrich observed what appeared to be • Intraspecific signals will evolve only if altruistic calling by ravens at carcasses. they benefit both signaler and receiver. • Further observation showed that the callers were behaving selfishly. • Variety of signal modalities Pheromones Tactile signals • Calls helped callers recruit others and to Visual signals overwhelm owners of the territory where the food was located. Acoustical signals Pheromones Acoustical Signals • Chemical signals that diffuse through air • Sounds used in communication. or water. • Used to attract mates, secure territory, • May bring about behavioral change in warn off rivals. receiver or cause physiological change (priming pheromones). • May also be used to communicate danger, keep groups together. Acoustical Signals Visual Displays • Important in courtship and in aggression. • Baring of teeth by baboon communicates threat. • Play bow in wolves solicits play behavior. • Flashing of fireflies attracts mates. 7 Tactile Display • Signaler and receiver communicate by touch • Honeybee dance language Signal Variation Ritualized Displays • Some signals never vary. • Common behavior patterns are exaggerated and simplified. • Other signals can be varied to convey information about the signaler. • Body parts may be enhanced or colored in way that enhances the display. • Composite signals combine information encoded in more than one cue; more • Ritualization is often important in potential for variation and information. courtship displays. Male Sage Ritualized Displays Grouse Courtship Fiddler crab uses oversized and brightly Display colored claw to lure mates into their dens. 8 High-Step in Courtship Displays in Blue-Footed Boobies Blue-Footed Boobies Illegitimate Signals Sexual Selection • An illegitimate receiver intercepts a • Reproductive success is measured in signal meant for individuals of another number of offspring produced. species. – Termite smells pheromone of invading ant • Reproductive success can be enhanced and attacks it. by increasing the number of matings or • An illegitimate signaler mimics signals the quality of mates. – Predatory fireflies mimic females of prey species. Male Reproductive Strategy Female Reproductive Strategy • Males produce energetically inexpensive • Females produce large, energetically sperm. expensive eggs. • Males often provide no parental care. • Females often provide parental care. • Males maximize reproductive success by mating with as many females as possible. • Females increase reproductive success by increasing the quality of their mates. 9 Choosy Females Male Contests • Female choice can dictate rules of male • Females of some species cluster in competition and shape male behavior. groups. • Selects for males that appeal to females. • Males of such species may fight one another for access to harems. • Male sage grouse display in leks. • Selects for large males that can defeat • Male hangingflies offer nuptial gifts. other males in contests. Male Northern Elephant Seal with Harem Male-Male Fighting Northern Elephant Seal (Mirounga angustirostris) Northern Elephant Seal (Mirounga angustirostris) Male-Male Fighting Male-Male Fighting Northern Elephant Seal (Mirounga angustirostris) Northern Elephant Seal (Mirounga angustirostris) 10 Meanwhile… Parenting Behavior • Enhancing the survival of offspring can increase parents’ reproductive success. • Parental behavior comes at a cost; drains time and effort that could be spent producing additional offspring. Benefits of Social Living Selfish Herd • Improved detection of predators; many • A group held together by self-interest. eyes. • Other members of the group form a • Improved repulsion of predators living shield against predators. – Musk oxen – Sawflies • Individuals may compete for the safest spots; positions in the center of the group. Male with Horns Dominance Hierarchy • Some individuals accept subordinate status to others. • Dominant members have higher reproductive success than subordinates. • Subordinates may do better over long term than if they were on their own. Musk Oxen (Ovibos moschatus) 11 Costs of Social
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