Lecture 5

# Lecture 5 - Midterm in one week on Thursday Will include...

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Unformatted text preview: Midterm in one week on Thursday Will include the material from today’s lecture, but not 10/14 Make-ups will only be granted for those with medical or family emergencies. Review session Monday (10/13) 7:00 PM, LSB 1001 Last year’s exam on the website. DSP students NEED a proctor. Please let DSP know today so they can provide one. H Equations you should understand and memorize: λ = e r Estimate of Population Size = # captured and marked day 1 1 Fraction marked (from 2 nd date) r = b- d H 0 years old 1 year old 2 year old 3 year old ≥ 4 year old 0 1 2 3 ≥ 4 0 1 2 3 ≥ 4 Age at time t Age at time t +1 survivorship Year λ 2000 1.2 2001 0.5 2002 0.8 2003 1.5 2004 1.6 2005 0.4 2006 1.4 Average 1.06 Assume Turtle population is so small (100 individuals) that we can ignore density dependence. Population should be growing at about a 6% rate per year Year λ 2000 1.2 2001 0.5 2002 0.8 2003 1.5 2004 1.6 2005 0.4 2006 1.4 Average 1.06 H Assume Turtle population is so small (100 individuals) that we can ignore density dependence. You return 50 years later, and 95% of turtle population is gone. Could you have predicted this? Lecture 5 Outline- “Age structure and Environmental Variability” I. Review stage-structured models II. Age-structured models II. Survivorship curves III. Variability in vital rates A. Effects on age structure B. Demographic vs. environmental stochasticity C. Effects of variation in lambda on population growth H No immigration or emigration Discrete periods of birth and death No age or stage structure (all individuals are equally likely to die and produce offspring) Constant environmental conditions No density dependence (as the population grows, stays the same) Assumptions of the geometic growth model ( is constant through time) H Stage-Based Model Divide the population up into stages that differ in key demographic transitions (birth and death rates) Quantify: 1. The probability of transitioning between different stages 2. The contribution of each stage to new individuals Lect. 4 H Stage at time t Stage at time t +1 J A J A Juveniles J Adults A P(Maturing) = m #offspring produced per adult = b P(Staying juvenile) = s J P(Survival) = s A Express Model as a Matrix Model Lect. 4 H Parker 2000 Scotch Broom Model Seed Seedling Juv SmAd MeAd LgAd XLgA Seed Seedling Juv SmAd MeAd LgAd XLgA Stage at t +1 Stage at t Lect. 4 H How do you collect these data?...
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## This note was uploaded on 02/26/2009 for the course EEMB 122 taught by Professor Levine during the Spring '09 term at UCSB.

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Lecture 5 - Midterm in one week on Thursday Will include...

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