BIO120H1 Lecture Notes - Lecture 13: Herbivore, Roaring Forties, Predictable Process
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BIO120H1 Full Course Notes
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Document Summary
Organisms and habitats are spread out in patches at all scales (large; and small): global -> regional -> habitat -> microhabitat. Resources exhaustible: substances used or consumed by organisms for survival. Conditions not exhaustible: temperature, ph, salinity, conditions vary across space and time. Gradients of conditions can occur from one extreme to another. Organisms perform best at certain levels -> certain points within a gradient: example: the death zone on mt. Low o2 concentration (1/3 of normal levels) Range of tolerance along environmental gradients: hierarchy of needs: survival is most basic, then growth, then reproduction (s>g>r). If centre of standard curve below is 25-30c. Left (cid:862) (cid:863) (cid:373)ight (cid:271)e (cid:1009)c a(cid:374)d right (cid:862) (cid:863) might be 50c. Two mice in the example would die below 5c and above 50c. Enzymes function in a narrow range of temperature, so temperature is very important. This curve can be applied to just about any organism for just about any environmental gradient.
