-5-
TIEE
Teaching Issues and Experiments in Ecology - Volume 13, April 2018
2. Summarize the findings from Figure 2 for the 24-hour period that the data is
collected. Write your summary in the space to the right of the figure.
DMS (nmol liter?¹)
300
200
100
0
8
16
24
Time (hours)
Figure 2: DMS production by phytoplankton while being grazed (black circles) or not (white circles) by
zooplankton. Taken from Dacey and Wakeham (1986)
Many marine organisms eat zooplankton, including fish, and seabirds such as
penguins.
3. Given this food web (Figure 1), do you expect fish to be attracted to the scent of
DMS(P)? Why or why not? Where would this cue be encountered, in the air or
in the water?
4. Given this food web, how might King penguins use the scent of DMS? Under
what conditions could DMS be encountered? How would the DMS be
encountered? What behavior would the penguin initiate in these waters?