BIO120H1 Lecture Notes - Lecture 11: Montane Ecosystems, Soil, Seed Dispersal

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12 Nov 2011
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Lecture 11: putting things together: species interactions in subalpine meadows. Seed germination experiments: plant the seed in 4 treatment combination, buried, organic soil(cid:224) live, exposed, organic soil(cid:224)died, buried, gravel soil(cid:224)died, exposed, gravel soil(cid:224)died! Long-lived, iteroparous; grows as a vegetative plants for years before flowering: at least 6-7 years to grow, resource storage organ is underground corm, seeds subject to desiccation unless in moist conditions, seed dispersal distance minimal the opposite) Set up study plot, 16x16 grid of 2x2m squares; measure variables in each square; make maps: factors measuring, flowering plants (count, vegetative plants (count, seedlings (subsample, soil moisture, rockiness, predation risk. Attacked underground by pocket gopher; eat corm. Huge cheek pouches to store food: quantified by the amount of soil they pushed up to make tunnel. Rock-refuge hypothesis: even if they germinate, might be a huge biotic factors affecting fitness, rocks are not an ideal place for glacier lilies, pushed by gophers; like refuges.

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