Ecology Unit Chapters 55-59 Notes PART 2


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3 Ansh Guglani 3 4 5 2 1 FLUCTUATION HUMANS - Early death - Consistent - approaching life expectancy - Large # of offspring - Equally likely to die - most individuals die at the - Few live to reproduce at any age (hydra) same age - Dandelions & oysters 2. Logistic growth – most natural populations (S-shaped curve) a. Limited by environmental factors such as: b. gG = gG ²³G ² c. Phases of: i. Establishment phase ii. Rapid acceleration iii. Slowing as population approaches K iv. Carrying capacity, K v. Stabilization/fluctuation around carrying capacity d. Carrying Capacity – maximum number of individuals that an environment can sustain (Long-Term)
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Unformatted text preview: C. Mortality Patterns – percent of an original population that survives to a given age 1. Type III 2. Type II 3. Type I D. Age Structure: shown by population pyramids can be right-side up, rectangle, inverted 1. Bar graphs that show the relative number of individuals in different age groups (cohorts) in the population. 2. Used to predict growth rate: large numbers of young individuals – Growing, Similar sized cohorts – Stable, large number of relatively old individuals – Declining. E. Density of Population: number of individuals per unit are or volume TIME (#)...
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This document was uploaded on 07/27/2011.

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