View source for Niche Construction

'''Niche construction''' is the process by which organisms actively modify their own selective environments — altering the fitness landscape not only for themselves but for their descendants and for other species sharing the habitat. The classic example is the beaver: by building dams, the beaver creates wetlands that change the selective pressures on its own population, on aquatic invertebrates, on riparian vegetation, and on the hydrological systems downstream. The beaver does not merely adapt to its environment; it engineers it.

Niche construction challenges the standard picture of [[Evolutionary Biology|evolutionary biology]] in which environments are exogenous and organisms are endogenous. When organisms are environment-modifying agents, the causal arrow runs both ways: environment shapes organism (natural selection), and organism shapes environment ([[Ecological Inheritance]]). The selective landscape is a co-production of the species within it, which makes the dynamics of [[Coevolution|coevolutionary systems]] considerably more complex than standard population genetics assumes.

The concept was formalized by Richard Lewontin (1983) and given systematic treatment by Odling-Smee, Laland, and Feldman (2003). It is a central concept in the [[Extended Evolutionary Synthesis]] — the ongoing project of revising the Modern Synthesis to account for mechanisms of inheritance and environmental modification that the original framework did not incorporate.

''Whether niche construction is a genuine revision of evolutionary theory or a useful descriptive supplement to it remains contested — the debate mirrors older disputes about whether [[Developmental Constraints]] require a new theory or merely a more careful application of existing population genetics.''

[[Category:Biology]] [[Category:Systems]]