BIO120H1 Lecture Notes - Lightning, Conifer Cone, Pioneer Species

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L09- BIO 120
๎€Science also perceives with theories, and generalization
๎€Biological integration๎€ species playing a role with another (depend on each
other)
๎€Inidividualistic hypothesis- the reason species work together b/c they have
similar ranges of tolerance๎€same 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-strategists) ๎€seral stages๎€climax stage (end)
๎€Plants attract birds, bird bring in seeds ๎€new colonists to keep succession
moving along.
๎€Primary succession- new species colonizes a place๎€eventually grow into a
lot more vegetation
๎€Secondary succession: disturbance is caused (fire, logging), and then
vegetation grows back.
๎€Annual plants๎€Perrenial weeds ๎€woody shrubs๎€small tres๎€trees with
closed canopy๎€shrub layers goes away(only shade-tolerant shrubs remain.
๎€Sometimes you donโ€™t get a stable climax! Such example are: boreal forest;
acid,sandy soils; fire-prone ecosystems; systems driven by seasonality,
cycling of dominants (A replaces B, the B replace Aโ€ฆ);transient substrates
(decay of log)
๎€Pine forest is at a flammable stage when pine cones cover ground (serve as
fuel๎€ignited by lightning from a storm)
๎€Two kinds of fires:
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Document Summary

science also perceives with theories, and generalization. biological integration species playing a role with another (depend on each other) inidividualistic hypothesis- the reason species work together b/c they have similar ranges of tolerancesame temp, habitatetc. 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-strategists) seral stagesclimax stage (end) plants attract birds, bird bring in seeds new colonists to keep succession moving along. primary succession- new species colonizes a placeeventually grow into a lot more vegetation. secondary succession: disturbance is caused (fire, logging), and then vegetation grows back.

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