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Ecology Unit Chapters 55-59 Notes PART 3


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4 Ansh Guglani PLASTICBAG MAN! 1. Paramecium 2. Dandelion – F. Dispersion – pattern of distribution in 2-D or 3-D 2-D space/ 3-D basic patterns exist 1. Random Spacing 2. Clumped Spacing 3. Uniform Spacing III. Regulation of Population Size A. Limiting factors – any factor operating to restrict population growth Abiotic (non-living) and Biotic (living) 1. Density-Dependent factors – factors than cause changes in birth rate, Fecundity [], or death rate, mortality, as density changes. a. Amount of resources (food, light, heating, site) b. Competition (for resources) c. Predation (predators: virus, disease, etc.) d. Behavioral changes (aggression)(failure to protect youth) e. Accumulation of waste
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Unformatted text preview: 2. Negative Feedback – as population size increases, growth rate decreases. As carrying capacity (K) is being reached: -Reproduction ratio declines -Mortality rate increases -^or both 3. Positive Feedback – Allee effect (Warder Allee) as population size increases, growth rate increases; why? Because: -Birth rate -Mortality Rate -Chance of Finding a Mate -Evenly spaced -Presence of one decreases probability of others -Territorially -Competition -Often found -Irregular spaced -Presence of one does not affect the others -uncommon -Aggregated in bunches -Presence of one increases probability of others -Uneven resources -Social interactions -common...
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