Table 7. Benthic algal conditions in the Clackamas River and select tributaries, Oregon.
[Sampling site locations are shown in figure 1. Algal biomass given as concentration of chlorophyll-ain milligrams per square meter. Abbreviation: sp., species]
| Sampling sites |
Benthic algae description |
Benthic algal biomass |
| July–August 2010 |
| Clackamas River at Carter Bridge |
Green algae (Prasiola sp., Ulothrix sp., Zygnema sp.), stalked diatoms (Cymbella mexicana), benthic diatoms (Epithemia sp.), and blue-green algae (Nostoc sp.) |
52 |
| Clackamas River at Estacada |
Stalked diatoms (Cymbella mexicana), benthic diatoms (Melosira sp. and
Epithemia sp.) |
421 |
| Clackamas River at Barton Bridge |
Filamentous green algae (Cladophora sp.), stalked diatoms (Cymbellamexicana), benthic diatoms (Melosira, Gomphonema, Synedra, and Nitzschia sp., Epithemia sp.), and lesser amounts of filamentous blue-green algae (Oscillatoria sp.) |
251 |
| Clackamas River at Carver |
Stalked diatoms (Cymbellamexicana), benthic diatoms (Melosira sp., Gomphonema sp.), with lesser amounts of filamentous green algae (Cladophora sp.) |
759 |
| Clackamas River upstream of
Highway 99E |
Filamentous green algae (Cladophora sp.), stalked diatoms (Cymbella mexicana), benthic diatoms (Melosira, Gomphonema, Synedra, and Nitzschia sp.), and red algae (Lemanea sp.) |
342 |
| Eagle Creek |
Stalked diatoms (Gomphoneis sp.), and blue-green algae (Oscillatoria sp. and Rivulariceaen heterocystous filaments) |
47 |
| Deep Creek |
Benthic diatoms (Melosira sp., Synedra sp., Navicula sp., and Cocconeis sp.) |
120 |
| Clear Creek |
Benthic diatoms (Melosira sp., Gomphonema sp., Synedra sp., Navicula sp., and Cocconeis sp.) |
38 |
| Rock Creek |
Benthic diatoms (Melosira sp., Rhoicosphenia sp., Synedra sp., Navicula sp., Nitzschia sp., and Cocconeis sp.) |
181 |
| Sieben Creek |
Benthic diatoms (Melosira sp., Synedra sp., Achnanthidium sp., Navicula sp., Nitzschia sp., and Cocconeis sp.) and green algae (Closterium sp.) |
155 |
| September 2010 |
| Clackamas River at Carter Bridge |
Filamentous green algae (Ulothrix sp.), blue-green algae (Nostoc sp.), stalked diatoms (Cymbella mexicana), and benthic diatoms (Epithemia sp. and
Rhopalodia sp.) |
58 |
| Clackamas River at Estacada |
Stalked diatoms (Cymbella mexicana), benthic diatoms (Epithemia sp.,
Synedra sp., Gompohonema sp.) |
152 |
| Clackamas River at Barton Bridge |
Filamentous green algae (Cladophora sp.), stalked diatoms (Cymbella mexicana), benthic diatoms (Melosira, Gomphonema, Synedra, and Rhopalodia sp.) |
144 |
| Clackamas River at Carver |
Filamentous green algae (Cladophora sp.), benthic diatoms (Melosira,
Gomphonema, Synedra, and Rhopalodia sp.), and filamentous blue-green
algae (Oscillatoria sp.) |
125 |
| Clackamas River upstream of
Highway 99E |
Filamentous green algae (Cladophora sp.), benthic diatoms (Melosira,
Gomphonema, Synedra, and Cocconeis sp.), and red algae (Lemanea sp.) |
93 |
| Eagle Creek |
Blue-green algae (Oscillatoria sp.) and benthic diatoms (Gomphonema sp.,
Cymbella minuta, Epithemia sp.) |
84 |
| Deep Creek |
Benthic diatoms (Melosira sp., Synedra sp., Navicula sp.) and green algae (Closterium sp.) |
193 |
| Clear Creek |
Benthic diatoms (Melosira sp., Synedra sp., Navicula sp., and Cymbella sp.) |
159 |
| Rock Creek |
Benthic diatoms (Melosira sp., Synedra sp., Navicula sp., Nitzschia sp., and Rhoicosphenia sp.) |
304 |
| Sieben Creek |
Benthic diatoms (Melosira sp. and Bacillaria paradoxa) and filamentous blue-green algae (Oscillatoria sp.) |
301 |
|
First posted February 11, 2013
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U.S. Department of the Interior |
U.S. Geological Survey