BIOL 230 Lecture Notes - Lecture 5: Insular Biogeography, Biogeography, Species Richness
Document Summary
Increase in size of area = increase in species number (strong linear relationship) Equation of a species area relationship (sar): s= za+c: s-species richness, a-area, z-slope of line, c-y intercept of line, sars can be plotted in either linear or log-log space, but easier to see patterns in log-log. Why large island more species: sampling effect: Even sampling effects can result in nonlinear (power) relationships: habitat effect: 2 things limited the # of species in small areas in scenario 2: low numbers of individuals and few habitat types. Nested: different sized areas within the same region; between-region: different sized areas in different regions. It did not differ- no difference in # of species between small and large islands when we sampled the same area (scenario 2) Still restrained area and that constrained the number of individuals and habitats. Overview: island: the number of species the region can support in terms of: resources, individuals,
