Ecology Unit Chapters 55-59 Notes PART 5

Biology

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6 Ansh Guglani 1. Low cost – produce as many offspring as possible when resources are abundant or when mortality is high 2. High cost – delay or minimize current reproduction to maximize growth and survival to enhance future reproduction C. Prodigal or r-selected populations 1. High reproductive rates, opportunistic, colonizers 2. Examples – Dandelions, Annuals, Insects D. Prudent or K-selected populations 1. Adapted to thrive when population is near its Carrying Capacity, higher Long-term survival, slower to recover 2. Examples – Elephants, Whales, Humans E. Most populations are along this Continuum Type r-selected K-selected FREQUENCY ONCE in a lifetime (INTERPARITY) repeatedly throughout lifetime # MANY FEW PARENTAL LITTLE/NONE
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Unformatted text preview: EXTENDED SIZE SMALL LARGE ASEX/SEX EITHER SEXUAL MATURATION QUICK LONG TIME TO REACH Reproductive Age V. Human Population A. K-selected life history traits B. Prior to 1700’s Slow growth C. Exponential (explosive) growth over past 300 years; birth rate unchanged/ death rate has Fallen dramatically D. Currently 6.5 billion, growth rate = 1.2%, 78 million a year, 1 million every 5 days, 150 every minute, will double in 58 years E. Uneven distribution, most growth in poorly developed countries F. Solution: Limit population growth and Resource consumption VI. Biological Communities A. Definition: a community comprises all the populations of organisms inhabiting a common environment and interacting with one another...
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This document was uploaded on 07/27/2011.

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