Week 12, Lecture 2, Community Ecology

Week 12, Lecture 2, Community Ecology - Community ecology...

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

View Full Document Right Arrow Icon
1 Lajoie –Communities ‘09 Community ecology An assembly of species in a habitat e.g. forest community, grassland community, bird community, mouse community, tree community, insect community Description of communities 1) Species content 2) Stability 3) Structure Lajoie –Communities ‘09 1) Species content 4 3 Abundance Species C Species B Species A Community Species richness - number of species Relative abundance - proportion of species Species diversity - richness and abundance 2 1 Richness Species C Species B Species A Community Lajoie –Communities ‘09 2) Stability We once thought: more species = more interaction = more energy pathways = more stability in perturbations But now: models predict ripple effects for long times simple communities return quickly to original Lajoie –Communities ‘09 3) Structure Organization is not random - habitat partitioning -c lumped vs even vs random - individualistic or interactive See Fig 45.4 Lajoie –Communities ‘09 Individualistic vs Interactive A chance assemblage of species found in the same area because they happen to have similar abiotic requirements. An assemblage of closely linked species locked in by mandatory biotic interactions.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Week 12, Lecture 2, Community Ecology - Community ecology...

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