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ANIMAL COMMUNICATION I.DEFINED -PROVISION OF INFORMATION BY A SENDER TO A RECEIVER, AND THE SUBSEQUENT USE OF THAT INFORMATION BY THE RECEIVER IN DECIDING HOW TO RESPOND. SIGNAL: VEHICLE OF INFORMATION 1)MUST PROVIDE (POTENTIAL) BENEFIT TO SENDER AND THE RECEIVER -SO, AN OWL HEARING A MOUSE MOVE AND USING THIS SOUND TO LOCALIZE IT IS NOT COMMUNICATION -SOUND MOVEMENT: CUE, NOT SIGNAL -OWL HEARING: EAVESDROPPING, NOT COMMUNICATING II. SIGNAL COMPONENTS: SIGNAL CONTENT – WHAT DOES THE SIGNAL CONVEY? SIGNAL DESIGN – HOW IS THE SIGNAL DESIGNED TO BEST CONVEY THE CONTENT TO THE RECEIVER - SUBJECT TO SELECTION OF THE ENVIRONMENT AND OF THE RECEIVER BIASES
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ANIMAL COMMUNICATION III. CONTEXT A. PARENT OFFSPRING BEGGING IN CHICKS -BEGGING SIGNALS HUNGER STATE (SIGNAL CONTENT) -MORE ACTIVE (LOUD AND FREQUENT) GETS MORE FOOD TEST: FLYCATCHERS BY OTTOSON ET AL. 87 -MALE OR FEMALE FITTED WITH CHIP THAT ACTIVATES RECORDING OF BEGGING UPON APPROACH -PARENT WITH CHIP FED THE CHICKS MORE OFTEN THAN PARENTS WITHOUT CHIPS -SUGGESTS THAT BEGGING COMMUNICATES HUNGER STATUS OF CHICK
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ANIMAL COMMUNICATION III. CONTEXT A. PARENT OFFSPRING DISTRESS AND HELP CALL IN CROCODILES -EGGS ARE LAID IN NESTS THAT HARDEN 1. UPON HATCHING, YOUNG CROCODILE CALL FOR HELP TO BREAK FREE 2. WHEN THREATEND, YOUNG CROCODILES CALL FOR HELP http://www.flmnh.ufl.edu/cnhc/potm-oct00.html
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ANIMAL COMMUNICATION III. CONTEXT B. GROUP COMMUNICATION: RECOGNITION OF KIN IN A LARGE GROUP e.g., RHESUS MACAQUES BY RENDALL ET AL. 96 -LIVE IN GROUPS -CAN INDIVIDUALS RECOGNIZE KIN BASED ON VOCALIZATIONS “CONTACT CALLS” -RECORDED AND PLAYED BACK RECORDINGS TO SEE RESPONSE -SIGNIFICANTLY RESPONDED TO KIN: QUICKER AND LONGER -SUGGESTS THAT CALL IS FOR RECOGNITION
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ANIMAL COMMUNICATION III. CONTEXT B. DOMINANCE: AVOID CONFLICT -FIGHTS CAN BE VERY COSTLY, SO ANIMALS SHOULD EVOLVE SIGNALS TO AVOID PHYSICAL FIGHTS – SIGNALS!
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ANIMAL COMMUNICATION III. CONTEXT C. PREY TO PREDATOR 1.GAZELLLE STOTTING REDUCES LIKELIHOOD OF CHASE & CAPTURE SIGNAL OF GAZELLE CONDITION? BY FITZPATRICK AND FANSHAWE SIGNAL INDIVIDUAL CONDITION
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ANIMAL COMMUNICATION III. CONTEXT C. PREY TO PREDATOR 2. UNPALATIBILITY OR TOXICITY POISON-DART FROGS (DONDROBATIDS) PITOHUIS OF NEW GUINEA Both groups have batrachotoxins, neurotoxins that cause paralysis.
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ANIMAL COMMUNICATION IV. MODES OF COMMUNICATION IN VERTEBRATES A.VISUAL: BASED ON COLOR AND BLACK & WHITE CONTRASTS B.SMELL: BASED ON CHEMICALS (OLFACTORY SIGNALS) C.SOUND: BASED ON DISTURBANCES OF A MEDIUM LIKE AIR OR WATER (AUDITORY) D.TOUCH: BASED ON STIMULATING SENSORS ON THE SKIN (TACTILE) E.ELECTRICAL: BASED ON CHANGING OF ELECTRICAL FIELDS
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 1. FISHES: VISUAL, OLFACTORY AND ELECTRICAL clown fish, Amphiprion ocellaris Paracheirodon axelrodi (red neon tetra) http://malawicichlids.com/index.htm
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 1. FISHES: VISUAL, OLFACTORY AND ELECTRICAL Trinidad Guppy (Poecilia reticulata) dimorphic – males smaller and colorful, females drab and larger native to Trinidad &Venezuela females prefer colorful males
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 1. FISHES: VISUAL, OLFACTORY AND ELECTRICAL electric fish: fish that can perceive and create an electric field Can generate100V to stun prey Primarily used like a radar but also used in communication, especially mate choice
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 1. FISHES: VISUAL, OLFACTORY AND ELECTRICAL electric fish mate choice by
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 1. FISHES: VISUAL, OLFACTORY AND ELECTRICAL olfactory (chemical) signaling in minnows and pikes FLATHEAD MINNOW BY CHIVERS AND COLLEAGUES -WHEN MINNOW IS TAKEN BY PIKE, RELEASES CHEMICAL CUES -ATTRACTS OTHER PIKE AND INCREASES HANDLING TIME – SOMETIMES ALLOW FOR ESCAPE (5 OF 13 IN THE EXPERIMENT DID)
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 2. AMPHIBIANS: VISUAL, AUDITORY AND OLFACTORY VISUAL – Poison dart frogs two color forms of Dendrobates pumilo in Panama Preference for own Color
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 2. AMPHIBIANS: VISUAL, AUDITORY AND OLFACTORY AUDITORY – -males call out in Spring -females prefer (approach) long calls
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 2. AMPHIBIANS: VISUAL, AUDITORY AND OLFACTORY AUDITORY AND VISUAL ARE NECESSARY! e.g., Poison Dart Frog by Narins and colleagues Is call and visible vocal sac necessary? -just calls, no fake frog: approach, no aggression -calls with various visual signals: see graph *Need both sound and pulsating vocal sac to initiate aggression
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 2. AMPHIBIANS: VISUAL AND OLFACTORY OLFACTORY – SALAMANDER Many salamanders use chemical secretion to mark territories and to attract mates e.g., California Slender Salamander -tested with moss with own chemicals vs. foreign -more aggressive (ATR – trunk raised) and retreat behavior when smelling foreign chemical
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 3. REPTILES: VISUAL AND OLFACTORY VISUAL – ANOLIS DEWLAP PUSH UP DISPLAYS – FENCE LIZARDS AND AUSTRALIAN AGAMIDS THREAT DISPLAYS ARE USED TO DEFEND TERRITORIES http://galliform.bhs.mq.edu.au/lizard2/
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 3. REPTILES: VISUAL AND OLFACTORY OLFACTORY – MARSHALL LIZARD e.g. Lacerta monticola lizard by Martin and Lopez
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 4. BIRDS: VISUAL AND AUDITORY
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 4. BIRDS: VISUAL AND AUDITORY VISUAL SIGNALS – VOGELKOP BOWERBIRDS
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 4. BIRDS: VISUAL AND AUDITORY AUDITORY – Song Sparrow
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 4. BIRDS: VISUAL ANDAUDITORY usually both, in a complex courtship e.g., White-collared manakins in Central America -complex dance, which involves rapid flight between samplings near ground -extension of elaborate and bright plumage -vocalizations (grunts) -snapping of wing feathers
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 5. MAMMALS: VISUAL, OLFACTORY AND AUDITORY (ALSO TOUCH) -BODY SIZE -WEAPON SIZE -PHYSICAL BATTLES
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 5. MAMMALS: VISUAL, OLFACTORY AND AUDITORY e.g., fallow deer by Clutton-Brock and colleagues -males aggregate in leks to attract females -groan rate correlates with mating success
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 5. MAMMALS: VISUAL, OLFACTORY AND AUDITORY experiment – men wore shirt for two nights in a row, and women were blindfolded and allowed to sniff shirts. Choose most attractive smell and relate this to MHC alleles e.g., olfactory – Humans and MHC results 1: women not taking oral contraceptives: found disimilar males more attractive than similar males women taking contraceptives: found similar males more attractive than dissimilar males results 2: odors of MHC-dissimilar men reminded women of their ex- or current partners more often than MCH-similar males frequency
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ANIMAL COMMUNICATION V. GENERAL OVERVIEW IN VERTEBRATES: PREDOMINANT MODES OF COMMUNICATION 5. MAMMALS: VISUAL, OLFACTORY AND AUDITORY (ALSO TOUCH) e.g., all four in wolves howling: long-distance signaling to pack growling: aggressive whimpering: submissive aggressive: teeth exposed, ears and hair erect urine and chemicals from scent glands communicate territory wolves reciprocally groom pack mates – social bonds submissive: ears tucked, body low
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ANIMAL COMMUNICATION VI. SIGNAL DESIGN HOW DO SIGNALS EVOLVE? A.BASED ON ECOLOGICAL FACTORS e.g., VISUAL SIGNALS -ANIMAL SIGNALS HAVE TO CONTRAST THE ENVIRONMENT (NOISE) AND BE CONSPICUOUS -ENVIRONMENT SHOULD SELECT FOR SPECIFIC SIGNALS THAT BEST FIT THAT ENVIRONMENT (PART OF PROCESS CALLED SENSORY DRIVE) -e.g., IN DARK HABITATS, MORE BRIGHT PATCHES THAN OPEN HABITATS Phylloscopus warblers of India
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ANIMAL COMMUNICATION VI. SIGNAL DESIGN HOW DO SIGNALS EVOLVE? A.BASED ON ECOLOGICAL FACTORS Karen Marchetti (UCSD) on Phylloscopus warblers of India Number of Bright Patches Correlate with Lighting Conditions
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ANIMAL COMMUNICATION VI. SIGNAL DESIGN HOW DO SIGNALS EVOLVE? B. BASED ON RECEIVER PHYSIOLOGY e.g., Rodd and colleagues’ work on guppies -Females prefer orange males -But different populations have different degree of preference for orange and amount of orange in males -guppies feed on orange fruits that fall to the rivers -tested several different food types, most populations preferred orange food -extent of preference for orange related to extent of preference for orange males!
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