C.5 Population Ecology (AHL)

IB Biology

R. Price

v. 1 2015

Allott, 642

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

#1: Sampling techniques are used to estimate population size

#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

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

Allott p 644

SAS: Analyzing Commercial Fishing Catches

https://www.sascurriculumpathways.com/portal/Launch?id=1555

#4 The phases shown in the sigmoid curve can be explained by relative rates of natality, mortality, immigration, and emigration

Allott p 646, 647

Allott p 646

#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

Skills: Modelling the growth curve using a simple organism such as yeast or species of Lemna

Allott p 647

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_/lessons/duk_cellresp_mary_less/duk_cellresp_mary_less.xml

Walpole, Brenda. Biology for the IB Diploma. 2nd ed. Cambridge: Cambridge UP, 2014. Print.

ImagesUnless otherwise noted, images are obtained from Pixabay (www.pixabay.com) and used under the CC0 Public Domain license.