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BIS 2B Lecture Notes - Lecture 6: Exponential Decay, Logistic Function, Exponential Growth

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ochrehare203
14 Apr 2018
School
UC-Davis
Department
Biological Sciences
Course
BIS 2B
Professor
Rosenheim Jay

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BIS 2B Full Course Notes
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Document Summary

Count how many of n were marked from before, m. Example: suppose you are trying to estimate the number of field mice in a small field. One day you capture 100 mice, mark them and release them. The next day you capture 150 mice of which 15 are marked. What is the estimate for the population size? n=150. Lots of types of patterns in population densities. Population densities decrease as a function of the average body size of an individual within the population (slope -0. 75/ 3/4) Patterns in population densities what causes population densities to change over time? we consider exponential and logistic growth logistic growth graph changes direction and begins to level off as it nears the carrying capacity. That means that the main difference between exponential and logistic growth is that logistic growth takes into account carrying capacity. Dn/dt = rate of change of population size. =birth rate - death rate + immigration rate - emigration rate.

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Related Questions

1. Which of the following risks is the result of random variation in the survival and production of offspring and is especially of concern for a small population?
A. Genetic drift
B. Environmental stochasticity
C. Inbreeding depression
D. Demographic stochasticity

2. Imagine you are a marine biologist and you want to estimate the population size of sea otters in your study area. Which of the following method would be the best approach to do this?
A. Counts
B. Mark-recapture
C. Quadrat
D. All of the above

3. You captured and tagged 15 otters on Day 1. A month later, you resample the area and catch 30 otters, of which 3 are tagged. What is the estimated total population size?
A. 30
B. 50
C. 125
D. 150
E. 450

4. If you used a mark-recapture approach to estimate the size of an animal population, but the tags were defective and fell off some of the originally sampled individuals, the method would tend to:
A. Underestimate the true population size
B. Overestimate the true population size
C. Either underestimate or overestimate the true population size, depending on how many individuals lost their tags
D. None of the above

5. Which of the following affect population size?
A. Birth, death
B. Birth, death, immigration, emigration
C. Birth, death, immigration, emigration, speciation
D. Birth, death, genetic drift
E. None of the above