Summary
In scientific ecology, climax community or climatic climax community is a historic term for a community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state. This equilibrium was thought to occur because the climax community is composed of species best adapted to average conditions in that area. The term is sometimes also applied in soil development. Nevertheless, it has been found that a "steady state" is more apparent than real, particularly across long timescales. Notwithstanding, it remains a useful concept. The idea of a single climax, which is defined in relation to regional climate, originated with Frederic Clements in the early 1900s. The first analysis of succession as leading to something like a climax was written by Henry Cowles in 1899, but it was Clements who used the term "climax" to describe the idealized endpoint of succession. Clements described the successional development of an ecological communities comparable to the ontogenetic development of individual organisms. Clements suggested only comparisons to very simple organisms. Later ecologists developed this idea that the ecological community is a "superorganism" and even sometimes claimed that communities could be homologous to complex organisms and sought to define a single climax-type for each area. The English botanist Arthur Tansley developed this idea with the "polyclimax"—multiple steady-state end-points, determined by edaphic factors, in a given climatic zone. Clements had called these end-points other terms, not climaxes, and had thought they were not stable because by definition, climax vegetation is best-adapted to the climate of a given area. Henry Gleason's early challenges to Clements' organism simile, and other strategies of his for describing vegetation were largely disregarded for several decades until substantially vindicated by research in the 1950s and 1960s (below).
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