EVSC 100 Study Guide - Midterm Guide: Logistic Function, Keeling Curve, Population Ecology

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Published on 8 Feb 2013
EVSC 100 (Surrey), Spring 2013
Midterm 1
The midterm will take place during lecture hours (2:30 pm 4:30 pm) in Room SUR 2740 on Friday,
February 8th. You shall have two hours to write the midterm. The exam is closed book. You are allowed
to bring your normal supply of stationary including a pen, non-programmable calculator etc. No other
electronic aids, cell phones, iPod’s and other electronic gadgets are allowed. You must also bring your
SFU or a government issued ID to the exam. Answer all question in pen. If you choose to write in pencil
you cannot question the marking.
Below is a list of five potential midterm questions. Three out of these five questions will appear on the
midterm. Write complete sentences in answering the questions and cite anything you use that is not
included in the lecture notes or lecture readings in APA format. There is no need to cite material from
the lecture notes or readings. Include graphs and figures wherever asked and wherever you think
necessary and make sure that they are properly captioned and the axis’ are properly labeled. The
answer booklet has 10 pages so plan to answer all three questions within this limit. Ensure that your
answers are legible. Illegible answers shall not be marked.
1. The current carbon dioxide concentration in the atmosphere is approximately 394 ppm
(co2now.org). As the Keeling curve shows (Keeling et al., 1995), there has been a steady increase
in the atmospheric carbon dioxide concentrations since the 1950’s. Critics argue that this trend
is likely to persist with some models predicting CO2 concentrations as high as 1000 ppm by 2100
(IPCC, 2001). Using this information and the current status quo answer the following questions:
a. Describe the role that CO2 plays in the atmosphere and why increasing CO2 levels are of a
b. List some of the factors that led to the increase in CO2 concentrations over the last century
and are responsible for its projected increase.
c. Mention some of the strategies that could be employed to reduce CO2 concentrations in the
2. The carrying capacity of a certain landscape is 1500 elks. A building company is planning to
construct a residential community around this landscape and have hired you as an
environmental consultant to predict the possible effects of the construction on the elk
community. The current size of the elk population is 1400 elks. The area of the elk habitat is 100
hectares. Post construction, this area will be reduced to 75 hectares. You can assume that the
construction will reduce the quality of the grazing resources. Use your basic knowledge of
population ecology and the logistic growth model to answer the following questions:
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