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The concept of an evolved adaptation

¹Department of Biology, University of New Mexico, Albuquerque 87131, USA.

Ciba Foundation Symposium

|January 1, 1997

Summary

Darwinian adaptation refers to traits shaped by past natural selection, not current usefulness. Understanding functional design reveals an organism's evolutionary past and environment.

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Area of Science:

Evolutionary biology
Behavioral ecology
Zoology

Background:

A Darwinian adaptation is a trait functionally designed by past evolution through natural selection.
Functional design distinguishes adaptations from traits arising from drift, mutation, or phylogenetic legacy.
Current adaptiveness, a recent interpretation, equates adaptation with present-day usefulness, diverging from the Darwinian concept.

Purpose of the Study:

To clarify the definition of Darwinian adaptation.
To differentiate between historical functional design and current adaptiveness.
To evaluate the implications of equating adaptation with current adaptiveness in research.

Main Methods:

Analysis of the concept of functional design in evolutionary theory.
Evaluation of research in behavioral ecology concerning human and non-human species.
Critique of the 'current adaptiveness' view of adaptation.

Main Results:

Darwinian adaptation is defined by its functional design from past selection, not its current utility.
The concept of current adaptiveness is inconsistent with the Darwinian definition and is not a scientifically testable prediction.
The environment of evolutionary adaptedness is knowable through the functional design of Darwinian adaptations.

Conclusions:

The functional design of an adaptation provides insight into past selective pressures.
Equating Darwinian adaptation with current adaptiveness is a misconception that hinders scientific understanding.
Reconstructing the functional design of adaptations is key to understanding an organism's evolutionary history and environment.

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