Lande is best known for his early work extending quantitative genetics theory to the context of evolutionary biology in natural populations. In particular, he developed a stochastic theory for the evolution of quantitative traits by genetic drift and natural selection.[2] He also proposed a multivariate framework to describe the effect of selection on multiple correlated characters, thus helping clarify the much-debated notion of genetic constraints in phenotypic evolution.[5] He later applied and extended these results to study a wide variety of topics in evolutionary biology, including: sexual selection, speciation, the evolution of phenotypic plasticity, of self-fertilization, of life history, of a species range in space and time.[6]
Some of the concepts and tools he introduced, such as the phenotypic selection gradient (univariate or multivariate, directional or quadratic) and the G matrix, have become standard in evolutionary biology.[5]
Bernt-Erik Sæther, Steinar Engen and Russell Lande: Finite metapopulation models with density-dependent migration and stochastic local dynamics. London: Royal Society, 1999.(Reprint from Proceedings of the Royal Society of London. B, 226(1999)