L09- BIO 120
Science also perceives with theories, and generalization
Biological integration species playing a role with another (depend on each
Inidividualistic hypothesis- the reason species work together b/c they have
similar ranges of toleraesame temp, habitat..etc
How were the conflicting hypotheses (Clements vs. Gleason) tested?
Invective, and decades later, by data (gradient analysis- )
Graph D is what whitticher found on slide 9. Each pseices behaves
individualistically, do not respond to each others presence but the
envornment conditions that vary.
Another piece of evidence- post-glacial migrations of tree species. Howveer,
different tree specied went along different path, they differently.
Vegetation is PRIMAILY INDIVIDUALISTIC: envornment affects them not
the presence of other vegetation.
Pioneer species(stars with r-strategs)seral stags climax stage (end)
Plants attract birds, bird bring in snew colonists to keep succession
Primary succession- new species colonizes a lcveentually grow into a
lot more vegetation
Secondary succession: disturbance is caused (fire, logging), and then
vegetation grows back.
Annual plantsPerrenial weedswoody shrub s small trestrees with
closed canopyshrub layers goes away(only shade-