Biological Fitness

This innovative book uses tools from philosophy of science to analyse the much-disputed concept of fitness in evolutionary biology.

The concept of fitness is central to evolutionary biology but has been defined in many different ways. This book critically examines the biological and philosophical discussions of the fitness concept to offer an answer relevant to researchers and students in both disciplines. This title is also available as open access on Cambridge Core.Fitness is a central concept in modern biology, integral to the theory of evolution by natural selection. However, statements to the effect that fitness is 'complex', 'ambiguous' and 'impossible to define' abound in the literature. Why has fitness sparked so much confusion, given that natural selection itself is a well understood process? This book offers a novel answer using tools from the philosophy of science. The central argument is that fitness is a theoretical concept and thus defined by its role in evolutionary theory. However there turn out to be four subtly different roles that the concept has been called on to play. This analysis helps to shed light on numerous “fitness controversies” among evolutionists and to unify the philosophical and biological literatures on fitness. This title is also available as open access on Cambridge Core.