The evolutionary biologist Ernst Mayr was influenced by the work of the German biologist Bernhard Rensch showing the influence of local environmental factors on the geographic distribution of sub-species and closely related species.
O biólogo evolutivo Ernst Mayr foi influenciado polo traballo do biólogo alemán Bernhard Rensch que mostrou a influencia dos factores ambientais locais sobre a distribución xeográfica de subespecies e especies estreitamente relacionadas.