As múltiplas explicações em teoria evolucionária darwiniana

quarta-feira, fevereiro 03, 2010

Acta Biotheor (2010) 58:65–79
DOI 10.1007/s10441-009-9094-9

Multiple Explanations in Darwinian Evolutionary Theory

Walter J. Bock

Received: 1 November 2009 / Accepted: 1 November 2009 / Published online: 21 November 2009

© Springer Science+Business Media B.V. 2009

Abstract:

Variational evolutionary theory as advocated by Darwin is not a single theory, but a bundle of related but independent theories, namely: (a) variational evolution; (b) gradualism rather than large leaps; (c) processes of phyletic evolution and of speciation; (d) causes for the formation of varying individuals in populations and for the action of selective agents; and (e) all organisms evolved from a common ancestor. The first four are nomological- deductive explanations and the fifth is historical-narrative. Therefore evolutionary theory must be divided into nomological and historical theories which are both testable against objective empirical observations. To be scientific, historical evolutionary theories must be based on well corroborated nomological theories, both evolutionary and functional. Nomological and general historical evolutionary theories are well tested and must be considered as strongly corroborated scientific theories. Opponents of evolutionary theory are concerned only with historical evolutionary theories, having little interest in nomological theory. [*] Yet given a well corroborated nomological evolutionary theory, historical evolutionary theories follow automatically. If understood correctly, both forms of evolutionary theories stand on their own as corroborated scientific theories and should not be labeled as facts.

Keywords Evolution _ Explanations _ Nomological theory _ Historical theory

This paper is based on a lecture presented on 21 September 2009 in a series of seminars organized by the Columbia University’s Departments of Biological Sciences and of Ecology, Evolution and Environmental Biology in celebration of the 200th anniversary of Charles Darwin’s birth and the 150th anniversary of the publication of On the origin of Species.

W. J. Bock
Department of Biological Sciences, Columbia University, 1212 Amsterdam Ave Mail Box 2428,
New York, NY 10027, USA
e-mail: wb4@columbia.edu

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[*] NOTA DESTE BLOGGER: Os teóricos e proponentes da teoria do Design Inteligente somos críticos da atual teoria geral da evolução, mas ao contrário do afirmado por Bock, nós temos interesse tanto na sua forma histórica e nomológica.

NOTA IMPERTINENTE DESTE BLOGGER:

A evolução é aceita a priori como verdade científica. Além disso, o fato, Fato, FATO da evolução pode ser explicado por uma variedade de mecanismos evolutivos: se não for X, então Y; se não for Y, então Z,; se não for Z, então todo o ABC. São várias as teorias da evolução em Darwin, afinal de contas, Darwin se foi para preparar muitas 'moradas teóricas' interligadas...

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