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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Sabattus River - Station 170 Sampled by: Biomonitoring Unit
Town: Lisbon Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Androscoggin Sample ID: SA-170-2018R (1732)
Sample Date: 2018-06-20 Taxonomist: Ecoanalysts Idaho
Location: Below Maine Electronics, 40 M Below Dam
Sample comments:
Latitude: 44.03237473
Longitude: -70.10332751

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 = C
Attains Class = NO
Reason = Model
Model Result = C
Prob. Class A = 0.00
Prob. Class B = 0.09
Prob. Class C = 0.89
Prob. NA = 0.02

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 4.51 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 16.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 16.67 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 27.23 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 10.41 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) 48.10 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 47.02 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 72.75 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 5.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 14.29 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 81.28 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 30.00 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 64.21 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

Bankfull width = 26 m
Wetted width = 18 m
Depth = 67 cm
Water velocity = 6 cm/s
Riffle = 30 %
Run = 30 %
Pool = 40 %
Canopy Cover = 23 %
Bedrock = 20 %
Boulder = 30 %
Cobble = 20 %
Gravel = 20 %
Sand = 10 %
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
Dissolved Oxygen 2018-06-20 10.27 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2018-06-20 7.4 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2018-06-20 225.4 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2018-06-20 24 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Nitrate + Nitrite As Nitrogen 2018-06-20 0.12 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2018-06-20 1 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2018-06-20 38 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2018-06-20 0.6 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2018-06-20 49 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 1-5cm Long 1.27 Nuisance algae
Plant 9.84 Not algae
Sand / Mud 0.95 Not algae
Mat Incomplete 21.27 Thin algal layer
Mat <1mm Thick 66.67 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):
Impervious Cover %:
Land Use Table
Cover Type Percent Category
No data No Data No data

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

Site Information
Name: Sabattus River - Station 170 Sampled by: Biomonitoring Unit
Town: Lisbon Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Androscoggin Sample ID: SA-170-2018R (1732)
Sample Date: 2018-06-20 Taxonomist: Ecoanalysts Idaho
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
Tapinothrix Filamentous Cyanobacteria 0.401 0.047 NA
Achnanthidium rivulare Pennate Diatom 0.176 0.076 N P 49.9 39 49
Achnanthidium minutissimum Pennate Diatom 0.082 0.016 1 2 2 7 N P 41.2
Gomphonema caperatum Pennate Diatom 1 0.061 0.151 N S NA
Navicula cryptotenella Pennate Diatom 0.041 0.166 2 2 7 M P 44.6 61 82
Microchaete Filamentous Cyanobacteria 0.034 0.041 NA
Calothrix Filamentous Cyanobacteria 0.025 0.009 29.1 9 15
Phormidiaceae Filamentous Cyanobacteria 0.020 0.011 NA
Nitzschia amphibia Pennate Diatom 0.018 0.035 3 3 2 5 H P 79.8 53 93
Sellaphora saugerresii Pennate Diatom 0.013 0.008 M P NA
Aulacoseira ambigua Centric Diatom 0.007 0.035 3 2 2 5 N U 34.5 25 56
Fragilaria vaucheriae Pennate Diatom 0.007 0.014 3 3 2 5 N V 44.2 36
Nitzschia fonticola Pennate Diatom 0.007 0.010 2 2 2 4 H P 82.2 49 80
Phormidium Filamentous Cyanobacteria 0.007 0.014 42.6 60
Sellaphora atomoides Pennate Diatom 0.007 0.002 M P NA
Sellaphora nigri Pennate Diatom 0.007 0.002 M P NA
Adlafia suchlandtii Pennate Diatom 0.006 0.004 M P 29.1 33 65
Planothidium frequentissimum Pennate Diatom 0.006 0.004 3 4 2 V P 65.1 69 92
Fragilaria crotonensis Pennate Diatom 0.005 0.021 2 2 2 3 N V NA 53 64
Navicula cryptocephala Pennate Diatom 0.005 0.032 3 3 2 7 M P 56.3 55 80
Hippodonta capitata Pennate Diatom 0.004 0.017 3 3 2 4 M P 66.8 61 89
Nitzschia frustulum Pennate Diatom 0.004 0.002 3 2 3 5 H P 50.4 53 88
Chroococcales Cyanobacteria 0.004 0.001 NA
Achnanthidium subhudsonis var. kraeuselii Pennate Diatom 0.003 0.001 V P 57 33 89
Desmodesmus Colonial Green 0.003 0.002 NA
Encyonema silesiacum Pennate Diatom 0.003 0.005 3 3 2 7 V S 46.9 43 69
Gomphonema parvulum Pennate Diatom 0.003 0.005 4 4 2 5 N S 42.2 21
Navicula gregaria Pennate Diatom 0.003 0.014 4 3 3 5 M P 79.6 66 89
Planothidium daui Pennate Diatom 0.003 0.002 1 1 2 1 V P NA
Scenedesmus Colonial Green 0.003 0.002 NA
Undetermined bluegreen filament Cyanobacteria 0.003 0.001 NA
Coelastrum Colonial Green 0.003 0.002 NA
Pseudostaurosira brevistriata Pennate Diatom 0.003 0.010 1 1 2 7 N E 32.2 46 45
Achnanthidium deflexum Pennate Diatom 0.002 0.001 1 2 3 N P 43.5 40 52
Gogorevia exilis Pennate Diatom 0.002 0.002 1 2 2 7 N P 51.1 63 91
Amphora pediculus Pennate Diatom 0.002 0.000 2 2 2 5 M P 76.2 71 93
Cymbella subturgidula Pennate Diatom 0.002 0.011 V S 23.6 26 35
Cymbella tumida Pennate Diatom 0.002 0.128 1 1 2 4 V S 57.8 48 78
Eunotia incisa Pennate Diatom 0.002 0.009 1 1 1 1 V E 24.8 18 35
Fragilaria tenera Pennate Diatom 0.002 0.004 1 1 1 2 N V 31.9 27 41
Navicula lanceolata Pennate Diatom 0.002 0.056 3 3 3 5 M P 77.5 75 98
Nitzschia archibaldii Pennate Diatom 0.002 0.001 2 2 2 5 H P 60
Nitzschia palea Pennate Diatom 0.002 0.001 4 5 2 6 H P 60.3 67 89
Nitzschia soratensis Pennate Diatom 0.002 0.000 H P NA
Frustulia saxonica Pennate Diatom 0.001 0.014 1 1 1 1 M P NA
Prestauroneis protracta Pennate Diatom 0.001 0.003 3 2 3 5 M P NA
Sellaphora pupula Pennate Diatom 0.001 0.004 3 3 2 4 M P 46.8 38 75
Undetermined coccoid green Colonial Green 0.001 0.003 NA

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.