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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Piscataquis River - Station 152 Sampled by: Biomonitoring Unit
Town: Dover-Foxcroft Method: Periphytometer
Biomonitoring Basin Penobscot And Downeast Sample ID: SA-152-2001P (82)
Sample Date: 2001-07-16 Taxonomist: Michigan State University
Location: 1 Km Below Dover - Foxcroft Potw
Sample comments:
Latitude: 45.18563052
Longitude: -69.16803792

Three figures from left to right: On the far left, an outline of the state of Maine with the site location marked in blue. In the middle, a satellite image view of the area of the site, with waterbodies marked in blue, and the site marked in red, with a scale bar and north arrow. On the right, a downstream image of the sample site.

Model Results and Variable Plots

 Blue = this sample. Boxplots = range of all samples. Grey shaded areas = 90th and/or 10th percentile of reference site values.

Statutory Class = B
Final Determination =
Attains Class =
Reason =
Model Result =
Prob. Class A =
Prob. Class B =
Prob. Class C =
Prob. NA =

Boxplots of stream algae model metrics, including range of values from all samples, from reference sites, and this specific sample. Stream algae model metrics are in a table below.

Additional Variable Plots

 Blue = this sample. Boxplots = range of all samples. Grey shaded areas = 90th and/or 10th percentile of reference site values.

Boxplots of additional stream algae metrics, including range of values from all samples, from reference sites, and this specific sample. Additional stream algae metrics are in a table below.

Model Variables Table
Variable Sample value All data median All data 10th percentile All data 90th percentile Reference range lower limit Reference range upper limit Reference range description
Salt-tolerant diatom percent abundance 2.46 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 11.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 32.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 17.02 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 25.15 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 3.74 1.19 0.00 17.43 0.00 1.05 <90th percentile
Additional Variables Table
Variable Sample value All data median All data 10th percentile All data 90th percentile Reference range lower limit Reference range upper limit Reference range description
Tolerance Index (all algae) 43.39 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 39.45 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 61.58 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 8.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 10.26 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 88.81 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 14.89 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 54.43 42.06 7.59 84.31 0.00 48.33 <90th percentile
Stream Characteristics and Water Chemistry Plots

 Blue = this sample. Boxplots = range of all samples. Grey shaded areas = 10th to 90th percentile of reference site values

Wetted width = 48 m
Depth = 80 cm
Riffle = 35 %
Run = 50 %
Pool = 15 %
Bedrock = 30 %
Boulder = 35 %
Cobble = 30 %
Gravel = 5 %
Sand = 0 %
Silt = 0 %
Clay = 0 %
Boxplots of stream water chemistry. Values are in a table below.
Water Chemistry Table
Parameter Sample Date Sample value All data median All data 10th percentile All data 90th percentile Reference 10th percentile Reference 90th percentile Units
Nitrate + Nitrite As Nitrogen 2001-07-16 0.01 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2001-07-16 5 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Kjeldahl Nitrogen 2001-07-16 0.4 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2001-07-16 21 18.00 7.00 48.00 4.00 18.00 Micrograms Per Liter
Viewing Bucket
Viewing Bucket Table
Cover type Percent cover Cover group
Filament >1cm Long 35.24 Nuisance algae
Mat 1-5mm Thick 13.33 Nuisance algae
Mat 5mm-2cm Thick 0.95 Nuisance algae
Sand / Mud 0.32 Not algae
Mat Not Visible 3.17 Thin algal layer
Mat Incomplete 25.08 Thin algal layer
Mat <1mm Thick 21.90 Thin algal layer

Barplot of viewing bucket substrate cover types, available in table on the right.

Land Use
Land Cover Data Source: MELCD 2004
Watershed Area (sq km): 930.5
Impervious Cover %: 1
Land Use Table
Cover Type Percent Category
Highly Urban 0.21 Developed
Urban 0.15 Developed
Residential 3.50 Developed
Water 2.12 Natural
Wetland 3.29 Natural
Forest 87.42 Natural
Grass 1.30 Agriculture
Cleared 0.04 Agriculture
Tilled 1.78 Agriculture

Barplots of landcover data from watershed upstream of sample location. Percentages are available in a table on the right

Site Information
Name: Piscataquis River - Station 152 Sampled by: Biomonitoring Unit
Town: Dover-Foxcroft Method: Periphytometer
Biomonitoring Basin Penobscot And Downeast Sample ID: SA-152-2001P (82)
Sample Date: 2001-07-16 Taxonomist: Michigan State University
Taxa List (See key at end of report)

 Tolerance values color coding: Blue for sensitive, <32.20. Purple for intermediate, >=32.20 and <60. Red for tolerant, >=60.

Name Group RA RB Oxy Sap Sal Tr Mot GF Tol TN TP
Stigeoclonium pachydermum Filamentous Green 0.194 0.051 42.6
Oedogonium Filamentous Green 0.110 0.071 37.6 27 47
Stigeoclonium nanum Filamentous Green 0.078 0.013 42.6
Chroococcus dispersus Cyanobacteria 0.074 0.008 NA
Achnanthidium minutissimum Pennate Diatom 0.056 0.006 1 2 2 7 N P 41.2
Oscillatoria sancta Filamentous Cyanobacteria 0.045 0.005 NA
Anabaena Filamentous Cyanobacteria 0.033 0.010 53.1
Encyonema minutum Pennate Diatom 0.030 0.019 2 V S 50.2 21
Gomphonema pumilum Pennate Diatom 0.029 0.015 2 7 N S 43.6 14 21
Mougeotia 5-75m Filamentous Green 0.028 0.136 26.9 10 12
Gomphosphaeria aponina Cyanobacteria 0.026 0.004 NA
Anabaena sp.1 KMM Maine Filamentous Cyanobacteria 0.025 0.001 53.1
Scenedesmus armatus Colonial Green 0.025 0.004 NA
Navicula cryptotenella Pennate Diatom 0.023 0.014 2 2 7 M P 44.6 61 82
Cocconeis placentula var. euglypta Pennate Diatom 0.022 0.013 3 2 2 5 N P 58.2 45 81
Melosira varians Centric Diatom 0.018 0.044 3 3 2 5 N U 67 67 89
Chroococcus dispersus var. minor Cyanobacteria 0.016 0.000 NA
Pediastrum duplex Colonial Green 0.016 0.001 NA
Fragilaria gracilis Pennate Diatom 0.014 0.006 1 1 2 2 N V 30.6 18 22
Merismopedia glauca Cyanobacteria 0.012 0.000 NA
Ulnaria ulna Pennate Diatom 0.012 0.124 3 4 2 N E 34.2 17 21
Navicula cryptocephala Pennate Diatom 0.011 0.007 3 3 2 7 M P 56.3 55 80
Spirogyra Filamentous Green 0.010 0.156 42.6 28 41
Coelastrum microporum Colonial Green 0.008 0.004 NA
Nitzschia palea var. tenuirostris Pennate Diatom 0.008 0.005 2 H P NA
Stauridium tetras Colonial Green 0.008 0.000 35.2
Nitzschia palea var. debilis Pennate Diatom 0.007 0.001 1 1 1 H P 53.4 47 79
Gomphonema truncatum Pennate Diatom 0.006 0.035 2 2 2 4 N S 36.5 47 44
Staurastrum dilatatum Desmid 0.005 0.178 NA
Fragilaria sepes Pennate Diatom 0.004 0.002 1 1 1 2 N V 32.1 18 39
Scenedesmus acutus Colonial Green 0.004 0.000 NA 61
Nitzschia palea Pennate Diatom 0.004 0.001 4 5 2 6 H P 60.3 67 89
Closterium parvulum Desmid 0.004 0.012 31.7 14 28
Cymbella tumida Pennate Diatom 0.003 0.031 1 1 2 4 V S 57.8 48 78
Gomphonema clevei Pennate Diatom 0.003 0.003 N S 31.3
Nitzschia agnita Pennate Diatom 0.003 0.001 4 H P NA
Fragilaria vaucheriae Pennate Diatom 0.002 0.001 3 3 2 5 N V 44.2 36
Nitzschia frustulum Pennate Diatom 0.002 0.000 3 2 3 5 H P 50.4 53 88
Nitzschia supralitorea Pennate Diatom 0.002 0.000 2 3 2 5 H P 65.4 62 89
Tabellaria flocculosa Pennate Diatom 0.002 0.006 1 2 1 3 N U 18.8 17 32
Brachysira microcephala Pennate Diatom 0.001 0.000 2 1 2 2 M P 18 12 18
Cymbella affinis Pennate Diatom 0.001 0.002 1 2 2 5 V S 36.4 36 39
Encyonopsis microcephala Pennate Diatom 0.001 0.000 1 1 2 4 V S 34.8 17 24
Gomphonema gracile Pennate Diatom 0.001 0.001 1 1 2 3 N S 21.9 13 20
Hippodonta capitata Pennate Diatom 0.001 0.001 3 3 2 4 M P 66.8 61 89
Navicula notha Pennate Diatom 0.001 0.001 M P 37.4 20 34
Nitzschia acidoclinata Pennate Diatom 0.001 0.000 1 2 1 3 H P 51.6 40 56
Nitzschia inconspicua Pennate Diatom 0.001 0.000 3 3 3 5 H P 83.7 69 98
Nitzschia perminuta Pennate Diatom 0.001 0.000 1 1 2 2 H P 56.7 53 76
Nitzschia lacuum Pennate Diatom 0.001 0.001 1 1 2 3 H P 64
Gomphonema parvulum Pennate Diatom 0.001 0.001 4 4 2 5 N S 42.2 21
Fragilaria mesolepta Pennate Diatom 0.001 0.001 2 N V NA
Encyonema silesiacum Pennate Diatom 0.000 0.000 3 3 2 7 V S 46.9 43 69
Gomphonema augur Pennate Diatom 0.000 0.002 1 2 2 4 N S NA
Achnanthidium subhudsonis var. kraeuselii Pennate Diatom 0.000 0.000 V P 57 33 89
Navicula gregaria Pennate Diatom 0.000 0.000 4 3 3 5 M P 79.6 66 89
Nitzschia gracilis Pennate Diatom 0.000 0.000 2 2 1 3 H P 46.9 22 64
Nitzschia recta Pennate Diatom 0.000 0.000 2 2 2 7 H P 46.6 43 73
Sellaphora pupula Pennate Diatom 0.000 0.000 3 3 2 4 M P 46.8 38 75
Sellaphora seminulum Pennate Diatom 0.000 0.000 4 4 2 5 M P 51.5 67 73
Karayevia clevei Pennate Diatom 0.000 0.000 2 2 2 4 V P 54.3 72

Taxa List Key
Column Name Description
RA Relative Abundance number of cells (density of cells per square centimeter) in a sample / total abundance of all taxa
RB Relative Biovolume Volume of a taxon’s cells in a sample / volume of all algae cells in a sample
Oxy van Dam Oxygen tolerance 1=100% DO saturation, 2=>75% DO saturation, 3=>50% DO saturation, 4=>30% DO saturation, 5=<30% DO saturation
Sap van Dam Saprobic value Saprobic values relate to the amount of organic pollution, biological oxygen demand, and DO concentrations. Values range from 1 (intolerant of organic pollution) to 5 (highly tolerant of organic pollution)
Sal van Dam Salinity value 1=freshwater (<100 mg/L chloride) , 2=fresh-brackish (<500 mg/L), 3=brackish-freshwater (500-1000 mg/L), 4=brackish (1000-5000 mg/L)
Tr van Dam Trophic value 1=oligotraphentic, 2=oligo-mesotraphentic, 3=mesotraphentic, 4=meso-eutraphentic, 5=eutraphentic, 6=hypereutraphentic, 7=indifferent to trophic state
Mot Motility of Diatoms Motility (capability of movement in water or on substrates) based on genus (Wang et al. 2005): N= not motile, M = motile , H = highly motile, V=variable within genus
GF Growth Forms E= erect, P=prostrate, S=stalked, U=unattached, V=variable (based on communication with R. Jan Stevenson)
Tol Tolerance value Tolerance to a combination of watershed disturbance, conductivity, and nutrient enrichment (based on Maine data). Value range from 1=most senstive to 100=most tolerant.
TN TN value Preference for total nitrogen (TN) based on Maine data. Values range from 1=low TN concentrations to 100=high TN concentrations.
TP TP value Preference for total phosphorus (TP) based on Maine data. Values range from 1=low TP concentrations to 100=high TP concentrations.