The Spandrels of San Marco and the Panglossian Paradigm¶
Gould, S. J., & Lewontin, R. C. (1979). The Spandrels of San Marco and the Panglossian Paradigm: A Critique of the Adaptationist Programme. Proceedings of the Royal Society of London. Series B, 205(1161), 581-598.
Cited by¶
7 citations across 7 artifacts.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Adaptation
- Not all system aspects are equally modifiable, the central warning of Gould and Lewontin's (1979) "Spandrels of San Marco" critique of pan-adaptationism: many features are architectural by-products of constraints rather than direct adaptations.
This sourceCanonical critique of pan-adaptationism; argues that many features are architectural by-products (spandrels) of structural constraints rather than direct adaptations, separating what can adapt from what is fixed by substrate.
Supported in partVerified against the publisher's abstract
The abstract supports the critique of pan-adaptationism and the role of constraints and non-adaptive by-products, but does not itself state that system aspects are unequally modifiable.
“organisms must be analysed as integrated wholes, with Baupläne so constrained by phyletic heritage, pathways of development and general architecture that the constraints themselves become more interesting and more important in delimiting pathways of change than the selective force that may mediate change when it occurs”
- Not all system aspects are equally modifiable, the central warning of Gould and Lewontin's (1979) "Spandrels of San Marco" critique of pan-adaptationism: many features are architectural by-products of constraints rather than direct adaptations.
- Exaptation
- Crucially, the structural logic also covers traits that arose for no function at all: Gould and Lewontin's (1979) spandrels — by-products of other design choices — are prime candidates for later co-option precisely because they were never optimized for anything and so carry uncommitted capacity.
This sourceCanonical critique of pan-adaptationism; argues that many features are architectural by-products (spandrels) of structural constraints rather than direct adaptations, which dissolves the demand for an adaptive just-so story for every useful trait.
Supported in partVerified against the publisher's abstract
The abstract backs spandrels as non-adaptive by-products whose current utility does not explain their origin, but is silent on later co-option and 'uncommitted capacity'.
“We fault the adaptationist programme for its failure to distinguish current utility from reasons for origin”
- Crucially, the structural logic also covers traits that arose for no function at all: Gould and Lewontin's (1979) spandrels — by-products of other design choices — are prime candidates for later co-option precisely because they were never optimized for anything and so carry uncommitted capacity.
- Observable Surface Becomes Contract
- In biology, evolutionary spandrels — features incidental to original adaptive pressure — become load-bearing through downstream co-option, with observability creating the surface for co-option.
This sourceIntroduces spandrels — incidental byproducts of other adaptations that become available for later co-option.
Supported in partVerified against the publisher's abstract
The abstract supplies Gould and Lewontin's origin-versus-current-utility distinction and their claim that current utility can be an epiphenomenon of non-adaptive structures, but not co-option becoming load-bearing.
“We fault the adaptationist programme for its failure to distinguish current utility from reasons for origin”
- In biology, evolutionary spandrels — features incidental to original adaptive pressure — become load-bearing through downstream co-option, with observability creating the surface for co-option.
Domain-specific¶
- Beneficial acclimation hypothesis
- Conceptual biological hypothesis only; no organism manipulation or experimental protocol.
This sourceRoy. Soc. London B 205. pp. 581-598.
- Conceptual biological hypothesis only; no organism manipulation or experimental protocol.
Mechanisms¶
- Affordance Discovery Workshop
- A workshop is very good at manufacturing convincing stories about why an affordance is a hidden purpose, and some of those affordances are mere byproducts that will not bear a real function's weight — the design equivalent of mistaking a spandrel for an intended arch.
This sourceThe spandrels critique warns that traits may be structural byproducts rather than direct adaptations for an inferred function.
- A workshop is very good at manufacturing convincing stories about why an affordance is a hidden purpose, and some of those affordances are mere byproducts that will not bear a real function's weight — the design equivalent of mistaking a spandrel for an intended arch.
- Mechanism Chain Diagram
- Its failure mode is the just-so story
This sourceCriticizes plausible but untested “just-so” adaptive stories that are treated as complete explanations without adequate evidence.
- Its failure mode is the just-so story
- Pressure–Solution Fit Rubric
- Its failure mode is the seductive one for any adaptive story — the just-so story, a fit hypothesis flexible enough to rationalize whatever shape is observed after the fact, so that no possible form would have scored low.
This sourceCritiques unconstrained adaptationist explanations as plausible just-so stories that can accommodate nearly any observed form without discriminating tests.
- Its failure mode is the seductive one for any adaptive story — the just-so story, a fit hypothesis flexible enough to rationalize whatever shape is observed after the fact, so that no possible form would have scored low.
Verification¶
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