Lecture2A

Lecture2A - TINBERGEN S 4 QUESTIONS TINBERGENS 4 QUESTIONS...

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INBERGEN’ S“ TINBERGEN S ABOUT BE • How does it develop? hat mechanisms cause What mechanisms cause • How did it evolve? • How does it contribute t QUESTIONS” 4 QUESTIONS HAVIOR t? Niko it? Tinbergen o survival?
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LEVELS OF • PROXIMATE CAUSES evelopmental mechanis Developmental mechanis – Immediate causal mechan LTIMATE CAUSES • ULTIMATE CAUSES – Historical pathways l t i – Selective processes ANALYSIS s ms isms
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HOW AND W HY BIRDS SING Cassin’s nch finch
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FEWOBSERVA A FEW OBSERVA BIRD • SPECIES VARY IN CO UALITY OF SONG V QUALITY OF SONG V • SONG TENDS TO BE S • SONG PRODUCTION V • SONG VARIES GEOGR TIONS ABOUT TIONS ABOUT SONG MPLEXITY OF SONG RIES WITH AGE ARIES WITH AGE EX SPECIFIC VARIES SEASONALLY APHICALLY
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VARIATION IN SO CASSIN’S FINCH TIME (seconds NG COMPLEXITY BLACK-CAPPED CHICKADEE )
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OCALIZATIONS VOCALIZATIONS AG CHANGE WITH CHANGE WITH E
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SEX SPECIFIC ZEBRA F MALE ITY OF SONG INCHES FEMALE
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SEASONAL VAR IATION IN SONG
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GEOGRAPHIC VAR Song dialects: Song type 1 IATION IN SONG Song type 2 Song type 3
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LEVELS OF • PROXIMATE CAUSES evelopmental mechanis Developmental mechanis – Immediate causal mechan LTIMATE CAUSES • ULTIMATE CAUSES – Historical pathways l t i – Selective processes ANALYSIS s ms isms
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eographic Var Geographic Var Dialects in •G e o graphic variation in ariants occur in cluster Variants occur in cluster – Variation within an area eas areas – Boundaries between song ation in Song: iation in Song: Songbirds song (within species) s less than variation between variants abrupt
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Non-geographic V Inter-individu ariation in Song: al Variation
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Non-Dialectal Geograp Clinal V hic Variation in Song: ariation
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ong D Song D lects ialects
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Some song dialects in Nuttall’s white-crowned sparrows MARIN BERKELEY SUNSET BEACH
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titude Mountain white- crowned sparrow ng dialects in La t song dialects in the Sierra Nevada Longitude
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SONORA PASS MOUNTAIN WHITE TIOGA PASS ROCKIES -CROWNED SPARROWS
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hat are the proximate de What are the proximate de what individual songbirds s rminants of terminants of ing?
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How does song dev elop in songbirds?
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atural Song Deve Natural Song Deve crowned • Young sparrows hear lot
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Lecture2A - TINBERGEN S 4 QUESTIONS TINBERGENS 4 QUESTIONS...

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