Intraspecific Competition.

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6. Scramble & Contest Competition: • Scramble competition: • Nicholson described scramble competition for dungflies competing for the limited resources of cow feces. • Each member gathers a constant amount of resource at all densities. Thus at high density there is insufficient resource and the whole population dies (slope b = ∞). • Contest competition: • Where individuals of the population interfere or contest with each others abilities to harvest resources, some survive. • Exact density-dependent compensation is thus described by a mortality slope b = 1. • Figs. 5.1 & 5.2 from Begon et al. (2006) to show both kinds and negative effects of competition in single species populations. BIOS 6150: Ecology - Dr. S. Malcolm. Week 3: Intraspecific Competition Slide - 6
7. Density dependence: • Competition also increases with population density when mortality may increase or survivorship may decrease (Fig. 5.2). • The nature of density dependence can also change with increasing density from: • density independence, through, • undercompensating density dependence, to, • exactly compensating density dependence, to, • overcompensating density dependence (Figs 5.3, 5.4 & 6.5). BIOS 6150: Ecology - Dr. S. Malcolm. Week 3: Intraspecific Competition Slide - 7
Page 1 and 2: BIOS 6150: Ecology Dr. Stephen Malc
Page 3 and 4: 3. Definition of Competition: •
Page 5: 5. Extremes of intraspecific compet
Page 9 and 10: 9. Density dependent growth: • In
Page 11 and 12: 11. Discrete breeding season model
Page 13 and 14: 13. Density dependence of the model
Page 15 and 16: 15. Continuous breeding - the logis
Page 17 and 18: 17. Asymmetrical competition: • L
Page 19 and 20: Figure 5.2: Survivorship of red dee
Page 21 and 22: Figure 5.4: Exact compensation in t
Page 23 and 24: Figure 5.7: Density dependent birth
Page 25 and 26: Figure 5.11: Examples of S-shaped p
Page 27 and 28: Figure 5.12: Effects of intraspecif
Page 29 and 30: Figure 5.15: Intraspecific competit
Page 31 and 32: Figure 2.3: (Hassell, 1976) BIOS 61
Page 33 and 34: Figure 5.18: Difference equation mo
Page 35 and 36: Figure 6.26 (3 rd ed.): Equation 5.
Page 37 and 38: Figure 5.23: Exponential and sigmoi
Page 39: Figure 5.27: Root vs shoot competit

Intraspecific Competition.

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