Lectures on species interactions and competition

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Tilman s resource-ratio model (1982): How 2 species can coexist competing for the same resources (1) Lines A and B are Zero Net Growth Isoclines (ZNGIs) of species A and B for resources R 1 and R 2 . – In the left figure, A can survive on lower levels of both resources, and will draw either resource to a level that B cannot survive (Area 2). – In the right figure, B is the superior competitor, and will draw either resource to levels that A cannot tolerate (Area 6). – Who can exist in areas 1, 3 and 5?
Tilman s resource-ratio model (1982): How 2 species can coexist competing for the same resources (2) R 2 1 A 2 B 4 3 1 In this case, the ZNGIs cross. A is a superior competitor for R 1 and B is the superior competitor for R 2. – Think of R 1 and R 2 as light and water. – The black dot is the two-species equilibrium point, where both species can coexist. – Species A will outcompete and replace B in Area 2. – Species B will coucompete and replace A in Area 3. – The outcome is less certain in Area 4 and depends on the consumption rate of each resource by each species. – The black dot is the point (amount of both resources) where both species can coexist. • Which resource is most limiting Species A? R 1
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 and 30: Competition experiments: Examinatio
Page 31 and 32: Competition for light and soil mois
Page 33 and 34: Nutrient flux gradients (Huston and
Page 35: Resource competition: Effect of com
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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