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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-170-2013R (1335)
Sample Date: 2013-06-26 Taxonomist: Academy Of Natural Sciences
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 = B
Attains Class = YES
Reason = Model
Model Result = B
Prob. Class A = 0.00
Prob. Class B = 0.98
Prob. Class C = 0.01
Prob. NA = 0.00

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 5.44 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 22.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 31.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 14.81 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 17.11 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 1.67 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) 43.58 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 42.05 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 68.78 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 13.21 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 97.93 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 27.78 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 71.89 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 = 32 m
Wetted width = 32 m
Depth = 41 cm
Water velocity = 99 cm/s
Riffle = 60 %
Run = 40 %
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 2013-06-26 6.6 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2013-06-26 6.86 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2013-06-26 178 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2013-06-26 23.5 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Dissolved Organic Carbon 2013-08-15 3.4 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2013-06-26 0.22 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2013-06-26 4 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2013-06-26 31 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2013-06-26 0.7 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2013-06-26 85 18.00 7.00 48.00 4.00 18.00 Micrograms Per Liter
Viewing Bucket

No viewing bucket data available

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-170-2013R (1335)
Sample Date: 2013-06-26 Taxonomist: Academy Of Natural Sciences
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
Phormidium Filamentous Cyanobacteria 0.330 0.050 42.6 60
Homoeothrix janthina Filamentous Cyanobacteria 0.185 0.002 43 19 21
Unknown Rhodophyte Florideophycidae (Chantransia) Red Algae 0.137 0.120 47.5 48 68
Leptolyngbya Filamentous Cyanobacteria 0.099 0.001 38.3 28 75
Achnanthidium minutissimum Pennate Diatom 0.071 0.004 1 2 2 7 N P 41.2
Achnanthidium rivulare Pennate Diatom 0.045 0.004 N P 49.9 39 49
Gongrosira Filamentous Green 0.018 0.041 37.3 37
Oedogonium Filamentous Green 0.014 0.682 37.6 27 47
Fragilaria vaucheriae Pennate Diatom 0.011 0.004 3 3 2 5 N V 44.2 36
Gomphonema parvulum Pennate Diatom 0.010 0.004 4 4 2 5 N S 42.2 21
Ankistrodesmus falcatus Colonial Green 0.010 0.001 45.7 58 75
Microspora tumidula Filamentous Green 0.006 0.001 NA
Cymbella tumida Pennate Diatom 0.003 0.014 1 1 2 4 V S 57.8 48 78
Encyonema minutum Pennate Diatom 0.003 0.001 2 V S 50.2 21
Eolimna minima Pennate Diatom 0.003 0.000 4 4 2 5 M P 57 64 88
Fallacia tenera Pennate Diatom 0.003 0.000 M P NA
Planothidium frequentissimum Pennate Diatom 0.003 0.001 3 4 2 V P 65.1 69 92
Aulacoseira ambigua Centric Diatom 0.003 0.002 3 2 2 5 N U 34.5 25 56
Caloneis bacillum Pennate Diatom 0.003 0.002 2 2 2 4 M P 64.9 72 96
Encyonema silesiacum Pennate Diatom 0.002 0.003 3 3 2 7 V S 46.9 43 69
Navicula gregaria Pennate Diatom 0.002 0.001 4 3 3 5 M P 79.6 66 89
Navicula recens Pennate Diatom 0.002 0.002 3 3 5 M P NA
Nitzschia frustulum Pennate Diatom 0.002 0.000 3 2 3 5 H P 50.4 53 88
Nitzschia palea Pennate Diatom 0.002 0.001 4 5 2 6 H P 60.3 67 89
Nitzschia palea var. debilis Pennate Diatom 0.002 0.000 1 1 1 H P 53.4 47 79
Trachelomonas volvocina Euglenoid 0.002 0.005 NA
Cymbopleura naviculiformis Pennate Diatom 0.001 0.003 2 2 2 5 V S 51.6 35 53
Discostella stelligera Centric Diatom 0.001 0.000 2 N U NA 51
Craticula subminuscula Pennate Diatom 0.001 0.000 4 4 2 5 M P NA
Eucocconeis laevis Pennate Diatom 0.001 0.000 1 1 1 1 V P 29.5 17 18
Fragilaria gracilis Pennate Diatom 0.001 0.000 1 1 2 2 N V 30.6 18 22
Hippodonta capitata Pennate Diatom 0.001 0.001 3 3 2 4 M P 66.8 61 89
Navicula antonii Pennate Diatom 0.001 0.000 M P 65.4 54 89
Navicula cryptocephala Pennate Diatom 0.001 0.001 3 3 2 7 M P 56.3 55 80
Navicula rhynchocephala Pennate Diatom 0.001 0.001 4 2 2 7 M P 62.1 44 78
Navicula symmetrica Pennate Diatom 0.001 0.001 M P NA
Nitzschia acidoclinata Pennate Diatom 0.001 0.000 1 2 1 3 H P 51.6 40 56
Nitzschia amphibia Pennate Diatom 0.001 0.000 3 3 2 5 H P 79.8 53 93
Nitzschia dissipata Pennate Diatom 0.001 0.001 2 2 2 4 H P 60.9 48 75
Nupela frezelii Pennate Diatom 0.001 0.000 M P NA
Placoneis elginensis Pennate Diatom 0.001 0.002 2 2 2 5 M P NA
Planothidium rostratum Pennate Diatom 0.001 0.000 3 3 2 5 V P 56.6 48 96
Rossithidium linearis Pennate Diatom 0.001 0.000 V P 32 24 56
Staurosira construens Pennate Diatom 0.001 0.000 1 2 2 4 N V 46.8 30 58
Surirella minuta Pennate Diatom 0.001 0.001 3 3 2 5 H P 79.7 69 95
Tabellaria flocculosa Pennate Diatom 0.001 0.002 1 2 1 3 N U 18.8 17 32
Staurosira construens var. venter Pennate Diatom 0.001 0.000 1 2 2 4 N V 41.3 35 67
Achnanthidium subhudsonis var. kraeuselii Pennate Diatom 0.001 0.000 V P 57 33 89
Adlafia bryophila Pennate Diatom 0.001 0.000 1 1 1 3 M P 38.2 20 59
Bacillaria paradoxa Pennate Diatom 0.001 0.003 N P NA
Undetermined Pennate diatom Pennate Diatom 0.001 0.002 NA
Cyclotella meneghiniana Centric Diatom 0.000 0.000 5 4 3 5 N U 72.6 55 73
Discostella pseudostelligera Centric Diatom 0.000 0.000 3 3 2 5 N U 28.6 38 86
Eunotia implicata Pennate Diatom 0.000 0.002 1 V E 28.3 16 15
Fallacia pygmaea Pennate Diatom 0.000 0.000 3 3 3 5 M P NA
Gomphonema gracile Pennate Diatom 0.000 0.000 1 1 2 3 N S 21.9 13 20
Gomphonema kobayasii Pennate Diatom 0.000 0.000 N S 71.2 50 79
Mayamaea agrestis Pennate Diatom 0.000 0.000 2 M P 67.8
Mayamaea atomus Pennate Diatom 0.000 0.000 2 4 2 6 M P NA
Navicula Pennate Diatom 0.000 0.000 M P NA
Navicula erifuga Pennate Diatom 0.000 0.000 3 5 M P 66.5
Navicula trivialis Pennate Diatom 0.000 0.001 3 3 3 5 M P 78.6 68 98
Nitzschia acicularioides Pennate Diatom 0.000 0.000 H P NA
Nitzschia recta Pennate Diatom 0.000 0.001 2 2 2 7 H P 46.6 43 73
Stauroneis kriegeri Pennate Diatom 0.000 0.000 2 2 2 4 M P 48.4 59 96
Staurosira construens var. binodis Pennate Diatom 0.000 0.000 1 1 2 4 N V NA
Staurosirella pinnata Pennate Diatom 0.000 0.000 1 2 2 7 N V 44.2 38 56
Stephanodiscus niagarae Centric Diatom 0.000 0.020 N U NA
Surirella linearis Pennate Diatom 0.000 0.007 2 2 2 H P NA
Ulnaria ulna Pennate Diatom 0.000 0.001 3 4 2 N E 34.2 17 21
Achnanthidium altergracillima Pennate Diatom 0.000 0.000 2 1 N P NA 26 31
Gogorevia exilis Pennate Diatom 0.000 0.000 1 2 2 7 N P 51.1 63 91
Aulacoseira granulata Centric Diatom 0.000 0.000 3 2 2 5 N U NA
Cocconeis placentula Pennate Diatom 0.000 0.000 3 2 2 5 N P NA 30 82
Cyclotella bodanica var. lemanica Centric Diatom 0.000 0.000 1 1 1 1 N U 14.3 21 20

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.