BIO120H1 Lecture Notes - Lecture 11: Soil, Erythronium, Elaiosome

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11 Nov 2012
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Lecture 11 species interactions in subalpine meadows
Distribution and abundance
Glacier lily flowering plants seem to do best where the soil surface is very rocky. Something about rock
that favors glacier lily. Life history: iteroparous, long resource accumulation phase in an underground
corm. Seeds stage primary seed dispersal distance. Results modal dispersal distance about 20cm
Secondary dispersal by ants, present in other Erythronium species elaiosome, full of elaios acid that is
attractive for ant because of protein, then they through it out with seeds, which is better dispersal and a
lot of nutrients in the soil in the ants garbage that favors the growth of the lily
Seed germination experiment
What factors about soil may influence on success of seeds. Deeper soil areas will contain more moisture
compared to the rocky. Buried in organic soil made it, others not.
Results of experiment suggest the opposite of what we saw: should find more plants away from thin soil
around rock outcrops
Should find most seedlings near flowering plants
- Flowering plants
- Vegetative plants
- Seedlings
- Soil moisture
- Rockiness
- Predation risk, pocket gopher
How to quantify gopher activity leave cores of soil in the spring
Flower vs vegetation vs seedlings
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Document Summary

Glacier lily flowering plants seem to do best where the soil surface is very rocky. Life history: iteroparous, long resource accumulation phase in an underground corm. What factors about soil may influence on success of seeds. Deeper soil areas will contain more moisture compared to the rocky. Buried in organic soil made it, others not. Results of experiment suggest the opposite of what we saw: should find more plants away from thin soil around rock outcrops. How to quantify gopher activity leave cores of soil in the spring. Few seeds that reach moist, deep-soil area are more likely to survive and produce seedlings. Most seeds are produced in rocky areas and fall there but most die. But seedlings that get established in deep-soil have a risk to be under predation of gopher. Desiccation due to abiotic conditions and stress, cant happen a lot, because flowers are there. Why no elaisome dispersal is a disadvantage.

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