Environmental Engineering Reference
In-Depth Information
FIGURE 18.1.
A composite scanning electron micrograph of a cross section of a periphy-
ton community. The area is approximately 1 mm
2
. Diatom species present include
Melosira
varians
(long cylinders),
Gyrosigma attenuatum
(sygmoid shaped), and various smaller species
of
Navicula
and
Nitzschia
. A layer of debris and extracellular exudates is at the bottom of
the mat (photo courtesy of Jane Greenwood; reproduced with permission from Greenwood
et al.,
1999).
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