Lectures on species interactions and competition

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Competition experiments: Examination of root and shoot competition (McGraw 1985) (2) Generally, the snowbed ecotype responded positively to shoot competition (dashed lines) competition; whereas the fellfield ecotype responded negatively. McGraw. 1985.
Competition for light and soil moisture (Shirley 1945) Objective: determine the relative importance of competition for light and soil moisture to pine seedlings. Picea glauca, Pinus strobus, P. resinosa and P. banksiana are the overstory species in north central Minnesota, but they do not reproduce in their own shade. Usually hardwood seedlings will occur beneath the trees. • (a) Effect of competition for light. Pine seedlings were grown beneath different layers of screens to achieve different levels of sunlight (a). Growth was not satisfactory below about 65% light. • (b) Combined effect of shade and root competition for water. – The overstory had three treatments. (b), (uncut, 1/3 removed, and clear cut). – The understory was also varied (control, all understory plants removed, weeded and trenched to sever plant roots). The results were complex and appeared to depend on initial site moisture. In moist areas, opening the canopy, weeding, and trenching improved seedling growth. In dry areas opening the canopy decreased seedling survival, but not seedling growth.
Page 1 and 2: This weeks schedule Mon, Wed: <stro
Page 3 and 4: Introduction • Individuals and po
Page 5 and 6: Pairwise interactions • Competiti
Page 7 and 8: Competition • Since plants requir
Page 9 and 10: Ways to study competition • Analy
Page 11 and 12: Gause s (1934) competitive exclusio
Page 13 and 14: Intraspecific (within species) comp
Page 15 and 16: Zero Net Growth Isocline diagrams (
Page 17 and 18: Situation where the isoclines cross
Page 19 and 20: Replacement series experiments (De
Page 21 and 22: Fisher et al. (2002) Experiments Ex
Page 23 and 24: Fischer et al. (2002) Results • U
Page 25 and 26: Replacement series (De Wit 1960) (a
Page 27 and 28: Competition experiments: Targetneig
Page 29: Competition experiments: Examinatio
Page 33 and 34: Nutrient flux gradients (Huston and
Page 35 and 36: Resource competition: Effect of com
Page 37 and 38: Tilman s resource-ratio model (1982
Page 39 and 40: Tilman s resource-ratio model (1982
Page 41 and 42: Implications of Resource-ratio hypo
Page 43 and 44: Reconciling the theories of Grime a
Page 45 and 46: Amensalism Interaction which depres
Page 47 and 48: Allelopathy: Salvia leucophylla-gra
Page 49 and 50: Other ways plants change their envi
Page 51 and 52: Summary • Major types of competit

Lectures on species interactions and competition

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