Vivian Abadi
06/12/24
ENV 1004
HW #3
1. After analyzing the relationship between butterfly phenology (day of
year) and mean temperature for spring and summer, answer:
• What is the general trend of these relationships in both seasons?
(increasing/decreasing/ no change) (2 pts)
A= There has been a decreasing relationship between the day of the year and temperature in
both seasons.
2. In which season do the changes in butterfly phenology occur
faster with changes in temperature? How can you tell? (2 pts)
A= In spring, the changes in butterfly phenology occurred more rapidly in response to
temperature changes, as shown by the steeper slope of the regression line. The slope for spring
is –12.1, while for summer it is –11.3. This shows that the timing of butterfly events shifts faster
with temperature changes in the spring compared to summer.
3. In which season do the temperature changes better explain the
changes in butterfly phenology? How can you tell?
A= To determine the season in which temperature changes explains the changes in butterfly
phenology, we examine the R^2 values from the regression equations. The R^2 value for spring
is 0.178, which is higher than the R^2 value for summer, which is 0.06. We can now see that the
temperature changes have a greater impact on butterfly phenology in the spring compared to
the summer.
4. Insert a graph showing the relationship between butterfly phenology
(day of year) and mean temperature for the season in which the
temperature changes better explain the changes in butterfly
phenology. (4 pts) For full points, your graph MUST:
• contain the regression equation and line
• contain the R2 value
• be fully customized with explanatory Main and Axis titles and a
Figure caption.
• be readable, thus, adjust the size of the figure and/or the font sizes.
A= This graph represents the relationship between spring temperatures, in Celsius, and the day
of the year for butterfly phenological events in British Columbia, Canada.
06/12/24
ENV 1004
HW #3
1. After analyzing the relationship between butterfly phenology (day of
year) and mean temperature for spring and summer, answer:
• What is the general trend of these relationships in both seasons?
(increasing/decreasing/ no change) (2 pts)
A= There has been a decreasing relationship between the day of the year and temperature in
both seasons.
2. In which season do the changes in butterfly phenology occur
faster with changes in temperature? How can you tell? (2 pts)
A= In spring, the changes in butterfly phenology occurred more rapidly in response to
temperature changes, as shown by the steeper slope of the regression line. The slope for spring
is –12.1, while for summer it is –11.3. This shows that the timing of butterfly events shifts faster
with temperature changes in the spring compared to summer.
3. In which season do the temperature changes better explain the
changes in butterfly phenology? How can you tell?
A= To determine the season in which temperature changes explains the changes in butterfly
phenology, we examine the R^2 values from the regression equations. The R^2 value for spring
is 0.178, which is higher than the R^2 value for summer, which is 0.06. We can now see that the
temperature changes have a greater impact on butterfly phenology in the spring compared to
the summer.
4. Insert a graph showing the relationship between butterfly phenology
(day of year) and mean temperature for the season in which the
temperature changes better explain the changes in butterfly
phenology. (4 pts) For full points, your graph MUST:
• contain the regression equation and line
• contain the R2 value
• be fully customized with explanatory Main and Axis titles and a
Figure caption.
• be readable, thus, adjust the size of the figure and/or the font sizes.
A= This graph represents the relationship between spring temperatures, in Celsius, and the day
of the year for butterfly phenological events in British Columbia, Canada.
