| Abstract: | During August through September of 1993-95, 83 periphyton samples were collected at 51 stream sites in the Ozark Plateaus. These sites were categorized into six land-use categories (20 forest, 18 agriculture, 10 mining, 1 urban, 1 urban/mining, and 1 mix), based on land-use percentages in the basin upstream from the site. Results indicate that periphyton communities
of riffles of Ozark streams are affected by natural
and land-use related factors. These factors include nutrients, dissolved organic carbon, alkalinity,
canopy shading, suspended sediment, embeddedness, stream morphometry, and velocity. For several measures of periphyton communities, statistically significant (p<0.05) differences were found among sites assigned to agriculture, forest, and mining categories. Blue-green algae biovolume,
relative abundance of blue-green algae, relative
biovolume of diatoms, relative abundance of oligotrophic algae, relative abundance of tolerant taxa, and condition index values were among the measures that differed among land-use categories. Although no environmental factors were significantly correlated with total biovolume, several
factors were significantly correlated with biovolume
of blue-green algae or biovolume of diatoms. Biovolume of blue-green algae was correlated
with percent agriculture land use. Biovolume
of diatoms was correlated with orthophosphate, total phosphorus, alkalinity, velocity, embeddedness, and dissolved organic carbon.Diatoms often composed the largest percentage
of the biovolume (relative biovolume). Diatom relative biovolume was much higher at mining sites (generally 75 to 90 percent of the total biovolume) than at forest or agriculture sites (generally
15 to 80 percent) and was correlated with several factors, including many land-use related factors. The diatoms Cymbella affinis and Cymbella
delicatula and the blue-green algae Calothrix often were the most common (relative abundance and relative biovolume) algae in samples.Detrended correspondence analysis (DCA) and hierarchical cluster analyses results indicated differences among land-use category sites. The DCA results were correlated with a number of land-use related factors and channel morphometry.Grazers (specifically, snails and stonerollers)
are related to periphyton biovolume and community
composition. Total periphyton and diatom biovolume typically were highest at sites where snail density was lowest. Lower relative abundances
of diatoms usually occurred at sites with higher snail densities and stoneroller relative abundances. |
| Genre: | USGS Numbered Series |
| ProdID: | 47753 |
| Citation Author: | Petersen, James C.; Femmer, Suzanne R. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 77 p. |
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| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 2002-4210 |
| Citation Search Results Text: | Periphyton communities in streams of the Ozark Plateaus and their relations to selected environmental factors; 2003; WRI; 2002-4210; Petersen, James C.; Femmer, Suzanne R. |
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| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Periphyton communities in streams of the Ozark Plateaus and their relations to selected environmental factors; 2003; WRI; 2002-4210; Petersen, James C.; Femmer, Suzanne R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/wri_2002_4210.jpg |
| URL (DOCUMENT): | http://ar.water.usgs.gov/LOCAL_REPORTS/WRIR_02-4210.pdf |
| Date Other: | Thu, 1 May 2003 00:00 -0500 |
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