DP Biology Option C5 Population Ecology

1. C.5 Population Ecology (AHL)
IB Biology
R. Price
v. 1 2015

2. Allott, 642

3. Skill: Modeling the growth curve using a simple organism such as yeast
Modeling organism:
Saccharomyces cerevisiae (means “the sugar fungus of the beer”)
Yeasts belong to the fungi kingdom
• Unicellular
• Cell wall (chitin not cellulose)
• Normal reproduction: asexual (budding)
Metabolism
• Anaerobic (does not need oxygen)
• Breaks down glucose for energy
• Byproducts: carbon dioxide & ethyl alcohol
Societal Uses
• Food (baking, brewing)
• Genetics Research
• Biotechnology
• Bioremediate toxic pollutants (arsenic)
"20100911 232323 Yeast Live" by Bob Blaylock - Own work. Licensed
under CC BY-SA 3.0 via Wikimedia Commons -
http://commons.wikimedia.org/wiki/File:20100911_232323_Yeast_Live.
jpg#/media/File:20100911_232323_Yeast_Live.jpg

4. #1: Sampling techniques are used to estimate population size

6. #2: The exponential growth pattern occurs in an ideal, unlimited environment
#3: Population growth slows as a population reaches the carrying capacity of the environment.
Allott pg 645

7. Application: Evaluating the methods used to estimate the size of commercial stock of marine resources.
Application: Analysis of the effect of population size, age, and reproductive status on sustainable fishing
practices
Allott
p 645

8. Allott
p 644

9. SAS: Analyzing Commercial Fishing Catches
https://www.sascurriculumpathways.com/portal/Launch?id=1555

10. #4 The phases shown in the sigmoid curve can be explained by relative rates of natality, mortality,
immigration, and emigration
Allott
p 646,
647

11. Allott
p 646

12. #5: Limiting factors can be top-
down or bottom-up
Application: Bottom-up control
of algal blooms by shortage of
nutrients & top-down by
herbivory
Allott
p 648

13. Skills: Modelling the growth curve using a simple organism such as yeast or species of Lemna
Allott
p 647

14. Sources
Content
Allott, Andrew, and David Mindorff. Biology: Course Companion. 2014 ed.
Oxford: Oxford UP, 2014. Print. Oxford IB Diploma Programme.
Hebrank, Mary. Teach Engineering. 2013. Regents of the University of
Colorado.
https://www.teachengineering.org/view_lesson.php?url=collection/duk_/les
sons/duk_cellresp_mary_less/duk_cellresp_mary_less.xml
Walpole, Brenda. Biology for the IB Diploma. 2nd ed. Cambridge: Cambridge
UP, 2014. Print.
Images
Unless otherwise noted, images are obtained from Pixabay
(www.pixabay.com) and used under the CC0 Public Domain license.