64
B.C. Wainman et al.
"1
30
25
E
D•
, . -.. •
'0
20 -i
' "
"0
15
C.
::i
10
.. ..". " -: •
.... -.. -
•
•
•
,
o --t------------ .. -o
10
20
Lipid % of Areal Production
30
~ .
~.
40
FIGURE 3.13. Relationship between the lipid percent of areal production and the lipid
percent of Pm. Points marked by arrows have very large leverage in the regression of the
two variables (see text).
The difference between the lipid percent of areal production and the lipid
percent of Pm (hereafter tenned the areal bias) changed over the year (Fig. 3.15).
The areal bias is an expression of the difference between the lipid percent of
production at light saturation and the lipid percent of production expressed on an
areal basis at anyone time. The lipid percent of Pm was greater than the lipid
percent of areal production in summer (i.e., negative bias), whereas the reverse
was true in winter. The areal bias was related to the changes in the photosynthetic parameters ' k and 40
•
c:
•
0
:u :::l 30
"0
•
e
•
Do;
•
~ 20
«
'0
"$
• • •
:g 10
c.
•
::i
•
10
12
14
16
18
a: a-Lipid
FIGURE 3.14. Relationship between the lipid percent of areal production and the ratio of a
to a-lipid (the a-ratio). The solid line is for the regression, lipid percent of areal production
= 25.9 - 1.32 * a-ratio (r2 = 0.62, n = 48).