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L08 – BIO 120
[Lecture 7 slideshow]
•Paine- study by removing predation.
•STAR FISH- KEYSTONE PREDATORS
•High disturbances high diversity
•Null model approach- no support
•Two classifications: dichotomy** + trichotomy
•R-strategists- not fighters, rather flee-ers.
•K-strategists- good competitors, but not good at moving fro one place to
another. *study list!
•Mining ghost town, smith’s pika research (metapopulation analysis
used) miners flooded into these areas in search for gold, failed
*short-lives phenomenon). Around this mining town are patches,
“tailing piles”, pikas like living in rock piles (artificially created by
•Do not need to know metapopulation equations!
•Exctinction can be driven by:
1.strong density-dependant factors (chaos)
3.unstable predator and prey
4.allee effects at low density
•these tendencies are countered by non-equilibrial conditions, habitat
patchiness, rescue-by-migration, variation in life-history strategy
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