BIOB50H3 Lecture Notes - Lecture 9: Vito Volterra, Steady-State Economy, Alpha Beta
Document Summary
A. g. tansley did one of the rst experiments on competition n 1917. He wanted to explain the distribution of two species of bedstraw: galium hercynicum, which was restricted to acidic soils, and g. pumilum, restricted to calcareous soils. Tasley found that if grown alone, each species could survive on both acidic and calcareous soils. But when grown together, soil type determined which would survive. Tansley inferred that competition restricted the two species to particular soil types in nature. Competition can limit the distributions and abundances of competing species. As far back as darwin, competition between species has been seen as an in uence on evolution and species distributions. Interspeci c competition: is an interaction between two species in which each is harmed when they both use the same limiting resource. Intraspeci c competition: can occur between individuals of a single species. For mobile animals, space for refuge, nesting, etc. These resources are usually in low availability.
