24
G.E. Napolitano
TABLE 2.1. Fatty acid composition (% of total fatty acids) of cultured and natural
populations of freshwater algae."
I
II
III
IV
V
VI
VII
VIII
IX
14:0
2.1
3.6
1.4
0.5
3
5
6.9
2.8
4.8
16:0
18.5
17.3
12.7
39.3
16
10
28.8
23.0
10.3
16:1007
22.6
15.1
1.3
31
9
1.6
16.8
13.5
CI6 PUFA
0.5
17
12.4
11.6
18:0
1.6
2.2
0.6
0.3
I
8
0.6
0.8
1.7
18:1009
1.9
3.5
11.6
12.9
2
16
29.0
2.6
1.6
18:1007
0.5
1.0
0.4
1.1
1.9
0.3
18:2006
11.4
4.3
12.9
10.7
26
0.5
4.5
0.5
18:3006
0.5
1.3
0.7
0.1
0.7
1.8
18:3003
24.6
23.2
22.2
12.2
5
0.2
20.6
2.8
18:4003
1.2
3.3
5.2
2.4
20:0
0.2
0.3
0.1
20:1009
0.3
0.6
2.1
20:4006
2.8
2.0
1.8
20:5003
2.6
2.3
26
7.8
7.3
6.7
22:5003
0.1
tr
22:6003
1.8
0.02
11.0
0.3
10.9
Reference"
2
3
4
2
5
"Cyanophyta: I, Oscillatoria sp. (cultured); II, Oscillatoria agardhii. Chorophyta: III, Scenedesmus
quadricauda (cultured); IV, Cladophora sp. Bacillariophyceae: V, Navicula pelliculosa (cultured).
Chryptophyceae: VI, Chryptomonas ovata (cultured). Dinophyceae: VII, Peridinium cinctum; VIII.
stream periphyton; IX, lake phytoplankton. tr, Trace.
"References: I, Ahlgren et al.. 1990; 2, Napolitano et al.. 1994; 3, Kates and Volkani, 1966; 4, Beach et
aI., 1970; 5, Napolitano et aI., 1995.
posItIons of the total lipids of cultures and natural populations of the major
divisions and classes of freshwater algae including Cyanophyta (cyanobacteria),
Chlorophyta (green), Bacillariophyceae (diatoms), Dinophyceae (dinoflagellates), and Chrysophyceae. Although the analyses of algal cultures are of limited
use in ecological studies, this information can be used to demonstrate the biochemical potential and the chemical composition of algae under a set of environmental conditions. The fatty acid profiles shown in Table 2.1 are difficult to
compare because they represent analyses performed on algae subjected to very
different growing conditions and analyzed by different techniques over a period of
many years. However, some generalizations on the occurrence of specific fatty
acids or fatty acid groups are attempted in this section. Despite these limitations, it
is apparent that the analyses of wild population of algae generally present a larger
number of fatty acids and also present higher concentrations of some "atypical"
fatty acids for a given taxon. For example, Table 2.1 shows that natural populations of Oscillatoria and Cladophora have conspicuous, or at least detectable,
levels of some ro3 PUFA, such as 20:Sro3 and 22:6ro3, which are ordinarily absent
in freshwater Cyanophyta and Chlorophyta, respectively. The occurrence of these
"atypical" fatty acids in natural algal populations may be explained by the pres-
G.E. Napolitano
TABLE 2.1. Fatty acid composition (% of total fatty acids) of cultured and natural
populations of freshwater algae."
I
II
III
IV
V
VI
VII
VIII
IX
14:0
2.1
3.6
1.4
0.5
3
5
6.9
2.8
4.8
16:0
18.5
17.3
12.7
39.3
16
10
28.8
23.0
10.3
16:1007
22.6
15.1
1.3
31
9
1.6
16.8
13.5
CI6 PUFA
0.5
17
12.4
11.6
18:0
1.6
2.2
0.6
0.3
I
8
0.6
0.8
1.7
18:1009
1.9
3.5
11.6
12.9
2
16
29.0
2.6
1.6
18:1007
0.5
1.0
0.4
1.1
1.9
0.3
18:2006
11.4
4.3
12.9
10.7
26
0.5
4.5
0.5
18:3006
0.5
1.3
0.7
0.1
0.7
1.8
18:3003
24.6
23.2
22.2
12.2
5
0.2
20.6
2.8
18:4003
1.2
3.3
5.2
2.4
20:0
0.2
0.3
0.1
20:1009
0.3
0.6
2.1
20:4006
2.8
2.0
1.8
20:5003
2.6
2.3
26
7.8
7.3
6.7
22:5003
0.1
tr
22:6003
1.8
0.02
11.0
0.3
10.9
Reference"
2
3
4
2
5
"Cyanophyta: I, Oscillatoria sp. (cultured); II, Oscillatoria agardhii. Chorophyta: III, Scenedesmus
quadricauda (cultured); IV, Cladophora sp. Bacillariophyceae: V, Navicula pelliculosa (cultured).
Chryptophyceae: VI, Chryptomonas ovata (cultured). Dinophyceae: VII, Peridinium cinctum; VIII.
stream periphyton; IX, lake phytoplankton. tr, Trace.
"References: I, Ahlgren et al.. 1990; 2, Napolitano et al.. 1994; 3, Kates and Volkani, 1966; 4, Beach et
aI., 1970; 5, Napolitano et aI., 1995.
posItIons of the total lipids of cultures and natural populations of the major
divisions and classes of freshwater algae including Cyanophyta (cyanobacteria),
Chlorophyta (green), Bacillariophyceae (diatoms), Dinophyceae (dinoflagellates), and Chrysophyceae. Although the analyses of algal cultures are of limited
use in ecological studies, this information can be used to demonstrate the biochemical potential and the chemical composition of algae under a set of environmental conditions. The fatty acid profiles shown in Table 2.1 are difficult to
compare because they represent analyses performed on algae subjected to very
different growing conditions and analyzed by different techniques over a period of
many years. However, some generalizations on the occurrence of specific fatty
acids or fatty acid groups are attempted in this section. Despite these limitations, it
is apparent that the analyses of wild population of algae generally present a larger
number of fatty acids and also present higher concentrations of some "atypical"
fatty acids for a given taxon. For example, Table 2.1 shows that natural populations of Oscillatoria and Cladophora have conspicuous, or at least detectable,
levels of some ro3 PUFA, such as 20:Sro3 and 22:6ro3, which are ordinarily absent
in freshwater Cyanophyta and Chlorophyta, respectively. The occurrence of these
"atypical" fatty acids in natural algal populations may be explained by the pres-