BIOL202 - Study Guide - Lecture 3 - Population Growth

# BIOL202 - Study Guide - Lecture 3 - Population Growth -...

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STUDY GUIDE: LECTURE 3 POPULATION GROWTH AND THE REGULATION OF POPULATION SIZE Reading : 1) Textbook reading: Black/Green Campbell (7 th ed) Chapter 52, pp. 1143-56, pay particular attention to fig 52.24 Green/Black Campbell (6 th ed) Chapter 52, pp. 1156-1171, pay particular attention to fig 52.21 2) Cohn, D. So many Bald Eagles, so little room left to nest. Washington Post (17 April 2006) – on course website Terminology : emigration vs. immigration resource intra specific competition (don’t confuse with inter specific competition) environmental carrying capacity ( K ) ZPG (zero population growth) Formulas: Memorize the following equations, know their meaning verbally , and know how to use them to compute change in population size. The latter two equations come from the text and are explained in the “practice problems” below. Δ N = bN - mN Δ t Δ N = (b - m)N = rN Δ t Δ N = rN (K - N) Δ t K Practice population growth math problems: Examples of the type of problems that you might see on an exam appear below. continued

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Concepts: 1. Many students confuse fecundity and per capita birth rate . For our purposes, fecundity is the rate of offspring production of a given individual (e.g., number of offspring produced in a given year by that individual). Per capita birth rate is the average rate of offspring production by all individuals in a population , including males. Make sure that you understand the difference. For example, if the annual per capita birth rate is 2, does this mean that all females give birth to 2 offspring per year? If your answer is “nope, that’s not right”, what then does that statement mean? 2. Be prepared to recognize exponential -type pattern of population growth and logistic - type pattern of population growth. In your own words, what is the key difference in the two patterns of population growth? 3. When you look at either an exponential or logistic population growth curve, what does the actual SLOPE of the line (or curve) represent? 4. What specifically do biologists mean when they say that the per capita birth ( b ) and mortality rates ( m ) in a population are “density-dependent?” Explain this concept verbally and show it graphically. (Note you do not need to explain why b and m are density-dependent – that comes below - just explain basically what this implies.) 5. Describe, briefly, the difference between interference vs. exploitative type intraspecific competition. Give an example of each using plants or animals that you thought up, i.e., NOT one from lecture or the text.
6. a) Explain in detail how intraspecific competition for food can lead to a decrease in the birth rate in a population. Use the Principle of Allocation in formulating your explanation. b) Explain how (and when) intraspecific competition for food can also cause an increase

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## This test prep was uploaded on 04/18/2008 for the course BIOL 201 taught by Professor Mechling during the Spring '07 term at Towson.

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BIOL202 - Study Guide - Lecture 3 - Population Growth -...

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