PanglossianParadigm Compatibility Mode

PanglossianParadigm Compatibility Mode - • One must not...

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5/5/2010 1 The Spandrels of San Marco and the Panglossian paradigm: a critique of the adaptiationist programme. Proc. R. Soc. Lond. B 205:581-598 Adaptationist programme Faith in the power of natural selection as an optimizing agent Each trait is viewed as having an adaptive story “…programme regards natural selection as so powerful and the constraints upon it so few that direct production of adaptation through its operation becomes the primary cause of nearly all through its operation becomes the primary cause of nearly all organic form, function, and behaviour.” In reality, organisms are not a collection of things (individually optimized traits), but an integrated whole
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Unformatted text preview: • One must not confuse the fact that a structure is used in some way with the primary evolutionary reason for its existence and conformation Black Carp—Exotic molluscivore Black Carp’s pharyngeal teeth are indeed well suited for its diet Snail Darter ( Percina tanasi ) “…has no adaptations for snail eating.” • Really? – Grabs snail – Forces it against bottom – Swallows whole Digests soft tissue yielding energy Snail Darter ( Percina tanasi ) – Digests soft tissue, yielding energy – Partially digests hard tissue, yielding minerals – Defecates remnant shell • Well suited anatomically, behaviorally, and physiologically • An integrated whole...
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