Lect 05 PP outline

Lect 05 PP outline - Evolution, Biological Communities, and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Evolution, Biological Communities, and Species Interactions Definitions evolution - genetic changes within a population over time natural selection - differential reproductive success mutations - random changes o in DNA adaptation - genetic trait that confers a selective advantage in a given environment Limits All living things have limits to the environmental conditions under which they can survive. Critical Limits Von Liebig proposed the single factor in shortest supply relative to demand is the critical determinant in species distribution. Shelford later expanded by stating each environmental factor has both minimum and maximum levels, tolerance limits, beyond which a particular species cannot survive. Tolerance Limits Critical Limits For many species, the interaction of several factors, rather than a single limiting factor, determines biogeographical distribution. For some organisms, there may be a specific critical factor that mostly determines abundance and distribution. Species requirements and tolerances can also be used as useful indicators....
View Full Document

This note was uploaded on 04/26/2008 for the course BIOLOGY 118 taught by Professor Richardson during the Spring '08 term at Winona.

Page1 / 3

Lect 05 PP outline - Evolution, Biological Communities, and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online