population growth in lemna minor l.
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Population Growth in Lemna minor. Pre-Lab: Important Notes & Homework. Safety: goggles, aprons, gloves Data collection: EVERY DAY for 1 st week HW:

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pre lab important notes homework
Pre-Lab: Important Notes & Homework
  • Safety: goggles, aprons, gloves
  • Data collection: EVERY DAY for 1st week
  • HW:
    • Become familiar with background info & procedures(S-1 – S-3 & S-5 – S-9). If anything is unclear, write it down for discussion on 10/28.
    • Copy Data tables, pre-lab questions (S-4) and post lab questions (S-10) into your notebook
    • Draw proper measuring technique for pipette, beaker, graduated cylinder
pre lab class work
Pre-Lab: Class work
  • Lecture / discussion
  • Each person will complete the following tasks in their own notebook. Feel free to discuss with group mates.
    • Answer the Pre-lab questions found on S-4 (you should have already copied the questions.)
    • Draw pictures of the three sets of test tubes you are establishing. Make sure to label contents of each set.
    • Draw figure 3
lecture discussion
Lecture / Discussion
  • Several Objectives
    • How L. minor population growth rate reacts in differing environments (pollution issues)
    • Determining r and K (biotic potential and its relationship to population growth )
    • Practice with designing / running an experiment (practice for Paper 3)
lecture discussion5
Lecture / Discussion
  • Why need a control?
  • Why have replicates?
  • What is carrying capacity?
    • What part of the curve shows carrying capacity?
    • Is that in a logistic growth curve or exponential growth curve?
  • What is biotic potential?
determining population size
Determining Population Size
  • Where,
    • d means change
    • N means Number of individuals
      • Nt is N at any given time (t)
      • N0 is N at time = zero
    • r is a constant: population’s intrinsic rate of increase
      • rm = biotic potential
    • K is carrying capacity
    • e is Euler’s constant (number) = 2.72
slide7

Exponential population growth equation:

    • dN/dt=rN
    • Nt = N0ert
  • Logistic population growth equation:
    • dN/dt = rN [(K-N)/K]

Allows us to determine intrinsic rate. Or if given r, can predict N at future time.

drawings
Drawings
  • Test tubes
    • the water?
    • L. minor?
    • Any treatments:pH buffer, solutions, screens & rubberbands?
    • Plastic wrap with holes & rubberbands?
  • Beaker, graduated cylinder, pipette
    • The meniscus?
    • Pipette at 90° angle to tabletop?
data tables
Data Tables
  • Three different tests x three replicates = 9 test tubes
  • Need a data table / each test tube