Environmental Engineering Reference
In-Depth Information
FIGURE 8.6
Common genera of diatoms: (A)
Cymbella,
(B)
Asterionella,
(C)
Navicula,
(D)
Fragilaria,
(E)
Coscinodiscus,
(F)
Gomphonema,
and (G)
Melosira
. Scale bars
m.
(A-D and G, reproduced with permission from Patrick and Reimer 1966, 1975; E and F, re-
produced with permission from Prescott, 1982).
10
groups can occasionally be important in freshwaters. However, detailed de-
scription is left to phycology courses and the comprehensive phycological
texts (South and Whittick, 1987; Graham and Wilcox, 2000).
Protozoa
Protozoa are found in all aquatic habitats. Some of the species classi-
fied as protozoa are also considered algae. Many types are heterotrophic
and survive by ingesting particles or absorbing dissolved organic carbon.
They are very important predators of bacteria in aquatic environments.
There are also important parasites in this group. Some of the smallest pro-
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