Lect. 18 diversity web

Lect. 18 diversity web - Community Ecology Community:...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Community Ecology Community : Association of interacting species inhabiting some defined area. Community Structure includes number of species, relative species abundance, and species diversity.
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Species Abundance Relative abundance = abundance of a species compared to other species in the area. Across all ecosystems, most species are moderately abundant – only a few are rare or very abundant.
Background image of page 2
3 Lognormal Distribution Lognormal (natural logarithm) is used to modify scales; comparisons become relative One species is twice as abundant as another, for e.g. Preston graphed abundance of species using logarithms. Lognormal Distributions Pattern exists across ecosystems! Phew, some consistency for once… Most species are moderately abundant, few rare or abundant spp.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Species Diversity Two factors define species diversity: Species Richness Number of species in the community.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/13/2012 for the course BIO 8 taught by Professor Prestongalusky during the Fall '11 term at Riverside Community College.

Page1 / 14

Lect. 18 diversity web - Community Ecology Community:...

This preview shows document pages 1 - 5. Sign up to view the full document.

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