Assignment 7 Section B (15 points) updated 9 PM 12/6/06

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Deadline: Friday, December 8, 2006 6 PM

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I. (4.5 pts.) Below are 4 profiles representing approximate sea water density vs. depth in the oceans. Match each profile to the location and season that it most closely resembles by entering the letter of the appropriate profile next to the latitude and month. Each profile may be used more than once or not at all. (0.25 pts. each)

For each letter you enter, indicate whether the profile you selected depicts a vertically unstable, unstratified, moderately stable, or strongly stable vertical stratification condition, and how that stratification combined with the latitude & season affects the light exposure of phytoplankton. (0.25 pts. each)

Latitude & Month	Profile	Stratification (Unstable, Unstratified, Moderately stable, Strongly stable)	Surface light availability for phytoplankton (Low, Moderate, High)
20˚N, January	3.	4.	5.
45˚N, January	6.	7.	8.
45˚N, April	9.	10.	11.
45˚N, July	12.	13.	14.
45˚N, October	15.	16.	17.
80˚N, January	18.	19.	20.

II. (4 pts.) Below are 4 profiles representing approximate primary production vs. depth in the oceans. Match each production profile to its respective density profile from Section I entering the letter of the appropriate production profile next to the letter of the appropriate density profile. (0.25 pts. each)

For each letter you enter, indicate the surface nutrient supply for phytoplankton associated with the density profile, and indicate the level of primary productivity that results from the availability of light and surface nutrient supply. Also indicate whether there is a spring or fall bloom condition, or no bloom.  (0.25 pts. each)

Density Profile	Production Profile	Surface nutrient availability for phytoplankton (Low, Moderate, High)	Primary productivity (Low, Moderate, High)	Bloom? (Spring, Fall, none)
A	21.	22.	23.	24.
B	25.	26.	27.	28.
C	29.	30.	31.	32.
D	33.	34.	35.	36.

III. (1.5 pts.) In the table below, name the type of phytoplankton that would probably be the dominant primary producer at each of the 3 latitudes & months listed, and why (0.5 pts. each)

Latitude & Month	Dominant type of phytoplankton (Diatoms, Dinoflagellates, Microflagellates + Cyanobacteria)	Why this is the dominant type of phytoplankton?
20˚N, January	37.	38.
45˚N, April	39.	40.
45˚N, July	41.	42.