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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Sebasticook River - Station 916 Sampled by: Biomonitoring Unit
Town: Winslow Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Kennebec Sample ID: SA-916-2009R (930)
Sample Date: 2009-06-25 Taxonomist: Academy Of Natural Sciences
Location: ~384 Ft Off Of Garland Rd
Sample comments: Much Deeper In The Middle, Collected Rocks Along The East Bank. Cobble
Latitude: 44.57045022
Longitude: -69.56335413

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 = C
Final Determination = B
Attains Class = YES
Reason = Model
Model Result = B
Prob. Class A = 0.01
Prob. Class B = 0.99
Prob. Class C = 0.00
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 3.56 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 24.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 37.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 17.19 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 24.50 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 1.37 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) 43.12 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 43.72 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 66.76 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 11.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 9.68 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 97.46 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 25.00 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 45.91 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 = 77 m
Depth = 58 cm
Water velocity = 61 cm/s
Riffle = 0 %
Run = 100 %
Pool = 0 %
Canopy Cover = 0 %
Bedrock = 0 %
Boulder = 25 %
Cobble = 35 %
Gravel = 25 %
Sand = 10 %
Silt = 0 %
Clay = 5 %
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 2009-06-25 9.5 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2009-06-25 7.23 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2009-06-25 58 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2009-06-25 19.7 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Dissolved Organic Carbon 2009-06-25 5.9 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Dissolved Organic Carbon 2009-06-25 5.9 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2009-06-25 0.03 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2009-06-25 0.03 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2009-06-25 6 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Orthophosphate As Phosphorus 2009-06-25 6 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2009-06-25 27 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Alkalinity 2009-06-25 27 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2009-06-25 0.5 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Kjeldahl Nitrogen 2009-06-25 0.5 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2009-06-25 33 18.00 7.00 48.00 4.00 18.00 Micrograms Per Liter
Total Phosphorus 2009-06-25 33 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): 2237.1
Impervious Cover %: 2
Land Use Table
Cover Type Percent Category
Highly Urban 0.31 Developed
Urban 0.35 Developed
Residential 0.63 Developed
Water 3.80 Natural
Wetland 9.50 Natural
Forest 71.10 Natural
Grass 5.69 Agriculture
Cleared 0.20 Agriculture
Tilled 5.14 Agriculture

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

Site Information
Name: Sebasticook River - Station 916 Sampled by: Biomonitoring Unit
Town: Winslow Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Kennebec Sample ID: SA-916-2009R (930)
Sample Date: 2009-06-25 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
Homoeothrix varians Filamentous Cyanobacteria 0.510 0.160 NA 32 66
Phormidium autumnale Filamentous Cyanobacteria 0.187 0.241 42.6 37 72
Phormidium Filamentous Cyanobacteria 0.164 0.199 42.6 60
Homoeothrix janthina Filamentous Cyanobacteria 0.087 0.005 43 19 21
Encyonema silesiacum Pennate Diatom 0.007 0.028 3 3 2 7 V S 46.9 43 69
Fragilaria vaucheriae Pennate Diatom 0.005 0.012 3 3 2 5 N V 44.2 36
Achnanthidium minutissimum Pennate Diatom 0.004 0.002 1 2 2 7 N P 41.2
Cocconeis lineata Pennate Diatom 0.003 0.051 3 2 2 5 N P 51.5 62 82
Reimeria sinuata Pennate Diatom 0.003 0.006 1 2 2 3 M P 60.9 65 88
Navicula wildii Pennate Diatom 0.003 0.009 2 2 M P NA 37 64
Ankistrodesmus falcatus Colonial Green 0.002 0.001 45.7 58 75
Fragilaria tenera Pennate Diatom 0.002 0.004 1 1 1 2 N V 31.9 27 41
Synedra rumpens Pennate Diatom 0.002 0.003 2 2 N E 34.3 20 32
Achnanthidium deflexum Pennate Diatom 0.001 0.001 1 2 3 N P 43.5 40 52
Gomphonema parvulum Pennate Diatom 0.001 0.002 4 4 2 5 N S 42.2 21
Nitzschia recta Pennate Diatom 0.001 0.019 2 2 2 7 H P 46.6 43 73
Diatoma moniliformis Pennate Diatom 0.001 0.002 3 N U 52.8 27 36
Fragilaria sepes Pennate Diatom 0.001 0.001 1 1 1 2 N V 32.1 18 39
Ulnaria acus Pennate Diatom 0.001 0.013 2 3 2 5 N E 31.7 29 48
Achnanthidium rivulare Pennate Diatom 0.001 0.001 N P 49.9 39 49
Planothidium rostratum Pennate Diatom 0.001 0.001 3 3 2 5 V P 56.6 48 96
Planothidium frequentissimum Pennate Diatom 0.001 0.001 3 4 2 V P 65.1 69 92
Cymbella subturgidula Pennate Diatom 0.001 0.001 V S 23.6 26 35
Gomphonema minusculum Pennate Diatom 0.001 0.001 N S NA 38 51
Gomphonema hutchinsoniana Pennate Diatom 0.001 0.001 N S 51.6 43 75
Geissleria decussis Pennate Diatom 0.001 0.002 1 2 4 M P 44.5 40 80
Navicula cryptocephala Pennate Diatom 0.001 0.004 3 3 2 7 M P 56.3 55 80
Hippodonta capitata Pennate Diatom 0.000 0.002 3 3 2 4 M P 66.8 61 89
Navicula menisculus Pennate Diatom 0.000 0.001 3 3 2 5 M P 64.3 44 72
Eolimna minima Pennate Diatom 0.000 0.000 4 4 2 5 M P 57 64 88
Ulnaria contracta Pennate Diatom 0.000 0.008 N E NA
Tabellaria flocculosa Pennate Diatom 0.000 0.003 1 2 1 3 N U 18.8 17 32
Gomphonema parvulius Pennate Diatom 0.000 0.000 N S NA 17 22
Meridion circulare Pennate Diatom 0.000 0.002 2 2 2 7 N E 46.5 64 87
Navicula antonii Pennate Diatom 0.000 0.000 M P 65.4 54 89
Staurosira construens Pennate Diatom 0.000 0.001 1 2 2 4 N V 46.8 30 58
Staurosirella pinnata Pennate Diatom 0.000 0.001 1 2 2 7 N V 44.2 38 56
Nitzschia palea var. debilis Pennate Diatom 0.000 0.001 1 1 1 H P 53.4 47 79
Closterium venus Desmid 0.000 0.044 NA 25 33
Euglena Euglenoid 0.000 0.004 NA 70 92
Melosira varians Centric Diatom 0.000 0.018 3 3 2 5 N U 67 67 89
Stephanodiscus niagarae Centric Diatom 0.000 0.040 N U NA
Cyclotella bodanica var. lemanica Centric Diatom 0.000 0.027 1 1 1 1 N U 14.3 21 20
Cyclotella meneghiniana Centric Diatom 0.000 0.002 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
Asterionella formosa Pennate Diatom 0.000 0.001 2 2 2 4 N U NA 26
Diatoma tenuis Pennate Diatom 0.000 0.001 3 3 3 5 N U 46.8 52 86
Pseudostaurosira trainorii Pennate Diatom 0.000 0.000 N E NA
Synedra sp. 8 NAWQA MORALES Pennate Diatom 0.000 0.013 N E NA 33 48
Gogorevia exilis Pennate Diatom 0.000 0.000 1 2 2 7 N P 51.1 63 91
Eucocconeis laevis Pennate Diatom 0.000 0.000 1 1 1 1 V P 29.5 17 18
Karayevia clevei Pennate Diatom 0.000 0.000 2 2 2 4 V P 54.3 72
Lemnicola hungarica Pennate Diatom 0.000 0.000 4 3 2 6 V P NA
Planothidium lanceolatum Pennate Diatom 0.000 0.001 3 3 2 5 V P 72.5 72 91
Eunotia formica Pennate Diatom 0.000 0.010 1 1 2 3 V E NA 33 52
Eunotia implicata Pennate Diatom 0.000 0.007 1 V E 28.3 16 15
Eunotia incisa Pennate Diatom 0.000 0.001 1 1 1 1 V E 24.8 18 35
Cymbella tumida Pennate Diatom 0.000 0.011 1 1 2 4 V S 57.8 48 78
Amphora copulata Pennate Diatom 0.000 0.002 2 2 2 5 M P 53.5 48 73
Amphora inariensis Pennate Diatom 0.000 0.001 2 1 M P NA 38 59
Gomphonema angustatum Pennate Diatom 0.000 0.002 1 1 2 1 N S 58 50 84
Gomphonema drutelingense Pennate Diatom 0.000 0.000 N S 54
Gomphonema micropus Pennate Diatom 0.000 0.001 2 2 2 5 N S 39 72 89
Gomphonema minutum Pennate Diatom 0.000 0.001 2 2 5 N S 54.6 61 55
Gomphonema pseudoaugur Pennate Diatom 0.000 0.002 3 2 5 N S NA 47 75
Gomphonema rhombicum Pennate Diatom 0.000 0.001 N S 32.1 28 36
Gomphonema subclavatum Pennate Diatom 0.000 0.001 1 2 2 2 N S 44.7 31 33
Gomphonema pumilum var. rigidum Pennate Diatom 0.000 0.000 N S 43.6
Gomphonema longilineare Pennate Diatom 0.000 0.003 N S NA
Diploneis parma Pennate Diatom 0.000 0.003 M P NA
Navicula cryptotenella Pennate Diatom 0.000 0.001 2 2 7 M P 44.6 61 82
Navicula gregaria Pennate Diatom 0.000 0.001 4 3 3 5 M P 79.6 66 89
Navicula radiosa Pennate Diatom 0.000 0.002 2 2 2 4 M P 41.8 34 73
Navicula reichardtiana Pennate Diatom 0.000 0.000 3 2 M P 55.7 51 71
Navicula rhynchocephala Pennate Diatom 0.000 0.002 4 2 2 7 M P 62.1 44 78
Navicula tenelloides Pennate Diatom 0.000 0.000 1 1 2 5 M P 75.8 51 62
Navicula trivialis Pennate Diatom 0.000 0.002 3 3 3 5 M P 78.6 68 98
Navicula veneta Pennate Diatom 0.000 0.000 4 4 3 5 M P 79.7 51 62
Navicula germainii Pennate Diatom 0.000 0.001 M P NA 51 85
Pinnularia microstauron Pennate Diatom 0.000 0.001 3 2 2 7 M P NA 37
Placoneis elginensis Pennate Diatom 0.000 0.001 2 2 2 5 M P NA
Rhoicosphenia abbreviata Pennate Diatom 0.000 0.001 2 2 2 5 V S 83.4 72 96
Surirella angusta Pennate Diatom 0.000 0.002 2 2 2 5 H P 65.4 57 96
Hantzschia amphioxys Pennate Diatom 0.000 0.003 2 3 2 7 H P NA 51 94
Nitzschia fonticola Pennate Diatom 0.000 0.000 2 2 2 4 H P 82.2 49 80

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.