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Lecture 2

BIOLOGY 173 Lecture Notes - Lecture 2: Plantago Lanceolata, Trifolium Repens, Interspecific Competition

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Marcus Ammerlaan

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1a) Define competition (one point)
An interaction between species that harms them both. (both species need/share a
limiting resource)
b) If the data say plant P grows taller in a pot with 50P than in a pot with 25P and 25Q,
which is more severe for plant P, intra- or inter-specific competition? Explain. (two
Inter-specific is worse.
P plants do better with 25 extra of their own kind (50P) than with an extra 25Q.
c) Using hypothetical plants P & Q again, what result(s) would tell you that P & Q were
in a mutualistic relationship? (two points)
P plants in 25P/25Q > P plants in 25P
Q plants in 25P/25Q > Q plants in 25Q
2) List the three parameters of a population that contribute to a T-value. You just have to
list them, but use their names, not the abbreviation from the formula (three points)
mean (average)
variance (or standard deviation)
3) A recent paper (Wurst, Langel & Scheu, Plant and Soil (2005) 271:123-130)
examined whether the presence of earthworms in soil affected competition between
plants. They planted 1 seedling each of rye, ribwort & clover in a pot and measured
above-ground biomass after 10 weeks. Rye and clover showed significant differences,
whereas ribwort and total plant biomass (sum of all 3 species) were not significantly
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