Trends in Ecology & Evolution
ReviewThe ecological causes of evolution
Section snippets
What causes natural selection?
When one contemplates how understanding of evolution has improved over the 150 years since Darwin first published his ideas about natural selection [1], it might come as a surprise to realise how little is understood about the causes of adaptive evolution in natural populations. Recent developments are causing evolutionary ecologists to think more explicitly about the nature of natural selection: how it varies spatiotemporally 2, 3, 4, 5, the ecology that drives it 6, 7, 8, how adaptation,
Functional analysis
The functional analysis of a trait or polymorphism, in which one infers selective agents from trait function, can be useful in the initial investigation of the causes of selection. For example, extravagant traits used in courtship are probably shaped by the aggression or choice of members of the same species. Clarke's study [16] of the alcohol dehydrogenase (Adh) polymorphism in Drosophila melanogaster is archetypal. The two common alleles (‘F’ and ‘S’) differ in their efficiency of catalysing
Observational data
Correlations between spatiotemporal variation in selection and putative environmental variables might help to identify selective agents [17]. Many studies have documented variation in the strength of selection through space and time. It is unfortunate that the ecological correlates of this have seldom been pursued in depth [5], because such studies afford a real opportunity to identify selective agents. Simple plots of selection metrics against single environmental variables can be revealing
Experimental manipulation of environment
The solution to most of the difficulties inherent in an observational approach to identifying agents of selection is to use an experimental one [17]. Although experimental approaches to the study of natural selection are not uncommon, many involve manipulations of traits or trait distributions 31, 32. These experiments tell little about selective agents, unless environmental factors are manipulated simultaneously. Such combination manipulations are powerful for gaining a full understanding of
Natural selection and evolution
An understanding of natural selection cannot be complete without knowing its causes, their relative importance and how they interact to form the eco-evolutionary landscape. There is currently a resurgence of interest in natural selection, and how its strength varies both spatially and temporally 3, 5, 14. Linking this directly to variation in selective agents would result in a more mechanistic understanding of selection. With an accompanying expectation of h2 or G [37], this would also enable
Concluding remarks
Current understanding of the causes of natural selection and, therefore, of evolution, is poor but could easily be improved by the appropriate analysis of existing data, and new experimental studies that explicitly measure the impact of environmental manipulations on the strength of selection. In particular, there is much to be learned from: (i) exploration of eco-evolutionary landscapes, especially using existing data from long-term evolutionary studies; (ii) meta-analysis of existing
Acknowledgements
I would like to thank Russ Lande for making me aware of the Wade and Kalisz paper, and Ryan Calsbeek, Francis Gilbert, Armand Kuris, Tom Reader, Erik Svensson and two anonymous reviewers for comments on earlier versions of the manuscript.
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