Hutchinson's rule

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

The observation that the trophic structures (i.e. mouths) of sympatric congeneric species generally vary by a factor of ~1.3.[1] This variation presumably leads to niche differentiation, allowing coexistence of multiple similar species in the same habitat, by partitioning food resources. The rule's legitimacy has been questioned, as other categories of objects also exhibit size ratios of roughly 1.3.


  1. ^ Eadie, John; Broekhoven, Louis (January 1987). "Size Ratios and Artifacts: Hutchinson's Rule Revisited". The American Naturalist. 129 (1): 1–17. doi:10.1086/284619. JSTOR 2461961.