Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table 7. Most common algal taxa from the five major Divisions identified in Richest Targeted Habitat samples, Willamette River basin and surrounding area, Oregon and Washington.
[Number of streams: One Richest Targeted Habitat (RTH) algal sample was collected from each of 28 streams. Abbreviation: cm2, square centimeter]
| Class | Order | Number of taxa |
Most common algal taxa | ||
|---|---|---|---|---|---|
| Scientific name | Maximum abundance (number of cells/cm2) |
Number of streams (RTH) |
|||
| Diatoms (Bacillariophyta) | |||||
| Bacillariophyceae | Pennales | 214 | Achnanthidium minutissimum | 7.3E×105 | 27 |
| Rhoicosphenia abbreviata | 7.3E×105 | 25 | |||
| Cocconeis placentula var. euglypta | 1.6E×105 | 25 | |||
| Planothidium lanceolatum | 2.2E×105 | 22 | |||
| Navicula minima | 3.1E×105 | 21 | |||
| Gomphonema kobayasii | 2.5E×105 | 21 | |||
| Sellaphora seminulum | 1.4E×105 | 21 | |||
| Achnanthes subhudsonis var. kraeuselii | 1.7E×106 | 17 | |||
| Bacillariophyceae | Centrales | 14 | Melosira varians | 2.5E×105 | 16 |
| Blue-green algae (Cyanophyta) | |||||
| Myxophyceae | Oscillatoriales | 10 | Homoeothrix janthina | 1.2E×107 | 21 |
| Myxophyceae | Chroococcales | 4 | Aphanocapsa sp. | 3.8E×106 | 1 |
| Myxophyceae | Nostocales | 1 | Calothrix fusca | 4.9E×104 | 1 |
| Euglenoid algae (Euglenophyta) | |||||
| Euglenophyceae | Euglenales | 1 | Trachelomonas volvocina | 5.9E×103 | 2 |
| Green algae (Chlorophyta) | |||||
| Chlorophyceae | Oedogoniales | 1 | Oedogonium sp. | 5.7E×104 | 6 |
| Chlorophyceae | Cladophorales | 1 | Cladophora glomerata | 5.0E×104 | 2 |
| Chlorophyceae | Chlorococcales | 4 | Scenedesmus ecornis | 3.0E×104 | 2 |
| Chlorophyceae | Chaetophorales | 1 | Stigeoclonium lubricum | 2.1E×105 | 1 |
| Chlorophyceae | Volvocales | 1 | Pandorina morum | 3.3E×104 | 1 |
| Chlorophyceae | Zygnematales | 1 | Spirogyra sp. | 1.0E×104 | 1 |
| Red algae (Rhodophyta) | |||||
| (Undetermined) | (Undetermined) | 1 | Unknown Rhodophyte Florideophycidae (chantransia stage) | 2.4E×106 | 25 |
| Total number of taxa | 254 | ||||
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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