Environmental Engineering Reference
In-Depth Information
Shredders
Grazers
Microbes
Predators
CPOM
1
Collectors
P/R <1
Collectors
2
Periphyton
3
Shredders
Microbes
Vascular
hydrophytes
Predators
4
P/R >1
Grazers
Periphyton
5
Tributary
FPOM
CPOM
6
FPOM
P/R <1
7
8
P/R <1
Phytoplankton
9
Microbes
Predators
10
11
12
Zooplankton
Collectors
Relative channel width
FIGURE 16.2
Longitudinal changes in organic matter inputs and consumer assemblages postulated
in the River Continuum Concept. (From
Allan and Castillo 2007
.)
it as well as filter-feeders that consume the
fine particles exported from upstream.
Larger and deeper rivers (orders
productivity with filter-feeding invertebrate
assemblages. The ratio of primary produc-
tivity to community respiration (P/R)is
hypothesized to peak in orders 4 to 6, but
7) have
less benthic and more water column algal
.
