Chapter 2b - anatomical features 3 The song control systems...

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1 LEVELS OF ANALYSIS • ULTIMATE CAUSES Historical pathways leading to behavioral trait Evolutionary stages, from origin of trait to the present – Effects of selection on history of trait • Effects of past and current usefulness on lifetime reproductive success The phylogeny of song learning in birds The phylogeny of song learning in birds
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2 The phylogeny of song learning in birds The song of a vocal non-learner, the eastern phoebe Normal wild- recorded birds Birds deafened prior to beginning to practice songs The vocal control systems of parrots, hummingbirds, and oscine songbirds share common
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Unformatted text preview: anatomical features 3 The song control systems of parrots, hummingbirds, and oscine songbirds Evolution of Vocal Learning Current phylogenetic distribution Multiple origins or single origin of vocal learning? How complete is our info on which groups are learners? Brain anatomy Striking similarities among diverse groups Adaptation versus evolutionary holdover Current selection may continue to favor learning Or presence of learning may simply reflect an evolutionary holdover from a common ancestor...
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This note was uploaded on 04/09/2010 for the course NPB NPB 102 taught by Professor Hahn during the Spring '10 term at UC Davis.

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Chapter 2b - anatomical features 3 The song control systems...

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