Lectures on species interactions and competition

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Examples of situations where plants use environmental tolerance to avoid competition • Serpentine soils, – Low in essential nutrients, extreme pH, high in toxic elements (e.g., Ni, Cr) – Support unusual plants, often highly endemic floras – Experimental evidence (e.g., Kruckeberg 1954) indicate that although serpentine plant species often can grow better in nonserpentine soils if grown without other species, they are poor competitors when grown with other species. • Saline soils – Halophytes can grow in soil with > 0.2-0.25% salt. – Many have special structure whereby they secrete excess salts. – Examples include mangroves, coastal salt marsh species, beach plants, desert herbs.
Amensalism Interaction which depresses one plant population while the other species remains unaffected. • For example, the strongly negative effect that a large species such as a tree might have on some small ground - cover species.
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 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: Reconciling the theories of Grime a
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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