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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Tannery Brook - Station 474 Sampled by: Biomonitoring Unit
Town: Gorham Method: Petri Dish Cores
Biomonitoring Basin Southern Maine Sample ID: SA-474-2010C (944)
Sample Date: 2010-06-29 Taxonomist: Academy Of Natural Sciences
Location: Park On Freedom Dr., Access Trail System From Cul-De-Sac.
Sample comments: Sand.
Latitude: 43.70136587
Longitude: -70.43628136

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 21.07 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 18.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 11.11 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 41.67 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 23.21 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) 51.68 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 45.58 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 69.71 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 4.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 24.44 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 73.75 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 38.89 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 69.44 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 = 6 m
Wetted width = 5 m
Depth = 32 cm
Water velocity = 37 cm/s
Riffle = 40 %
Run = 40 %
Pool = 20 %
Canopy Cover = 66 %
Bedrock = 0 %
Boulder = 20 %
Cobble = 30 %
Gravel = 20 %
Sand = 30 %
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
Dissolved Oxygen 2010-06-29 7.7 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2010-06-29 7.08 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2010-06-29 168 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2010-06-29 22.7 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Dissolved Organic Carbon 2010-06-29 2.4 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2010-06-29 0.26 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2010-06-29 5 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2010-06-29 53 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2010-06-29 0.4 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2010-06-29 39 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 0.63 Nuisance algae
Filament 5-15cm Long 2.86 Nuisance algae
Filament >15cm Long 4.76 Nuisance algae
Mat >2cm Thick 1.59 Nuisance algae
Freshwater Sponge 0.95 Not algae
Plant 0.63 Not algae
Sand / Mud 20.00 Not algae
Mat Incomplete 13.65 Thin algal layer
Mat <1mm Thick 54.92 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): 7
Impervious Cover %: 12
Land Use Table
Cover Type Percent Category
Highly Urban 3.75 Developed
Urban 3.90 Developed
Residential 6.76 Developed
Water 0.02 Natural
Wetland 1.75 Natural
Forest 54.73 Natural
Grass 14.30 Agriculture
Cleared 0.02 Agriculture
Tilled 2.37 Agriculture

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

Site Information
Name: Tannery Brook - Station 474 Sampled by: Biomonitoring Unit
Town: Gorham Method: Petri Dish Cores
Biomonitoring Basin Southern Maine Sample ID: SA-474-2010C (944)
Sample Date: 2010-06-29 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
Heteroleibleinia Filamentous Cyanobacteria 0.189 0.003 NA 22 22
Achnanthidium minutissimum Pennate Diatom 0.159 0.007 1 2 2 7 N P 41.2
Navicula gregaria Pennate Diatom 0.064 0.024 4 3 3 5 M P 79.6 66 89
Encyonema silesiacum Pennate Diatom 0.062 0.027 3 3 2 7 V S 46.9 43 69
Navicula cryptocephala Pennate Diatom 0.035 0.016 3 3 2 7 M P 56.3 55 80
Achnanthidium rivulare Pennate Diatom 0.034 0.003 N P 49.9 39 49
Fragilaria capucina Pennate Diatom 0.027 0.008 2 2 3 N V 32.9 59 51
Gomphonema angustatum Pennate Diatom 0.027 0.011 1 1 2 1 N S 58 50 84
Pseudostaurosira trainorii Pennate Diatom 0.024 0.001 N E NA
Nitzschia sigmoidea Pennate Diatom 0.022 0.082 3 2 2 5 H P NA
Navicula peregrina Pennate Diatom 0.019 0.105 4 5 M P NA
Nitzschia frustulum Pennate Diatom 0.018 0.001 3 2 3 5 H P 50.4 53 88
Cocconeis placentula var. euglypta Pennate Diatom 0.018 0.020 3 2 2 5 N P 58.2 45 81
Hippodonta capitata Pennate Diatom 0.016 0.008 3 3 2 4 M P 66.8 61 89
Staurosirella pinnata Pennate Diatom 0.016 0.003 1 2 2 7 N V 44.2 38 56
Synedra sp. 8 NAWQA MORALES Pennate Diatom 0.015 0.120 N E NA 33 48
Fragilaria vaucheriae Pennate Diatom 0.014 0.004 3 3 2 5 N V 44.2 36
Meridion circulare Pennate Diatom 0.014 0.010 2 2 2 7 N E 46.5 64 87
Navicula germainii Pennate Diatom 0.014 0.009 M P NA 51 85
Surirella amphioxys Pennate Diatom 0.014 0.110 2 4 5 H P 61.5 52 94
Gyrosigma spencerii Pennate Diatom 0.012 0.109 H P NA
Nitzschia subtilis Pennate Diatom 0.012 0.034 2 H P NA 29 61
Amphora ovalis Pennate Diatom 0.011 0.081 2 2 2 5 M P NA
Fragilaria tenera Pennate Diatom 0.011 0.003 1 1 1 2 N V 31.9 27 41
Navicula canalis Pennate Diatom 0.011 0.003 2 5 M P NA 50 89
Navicula cryptotenelloides Pennate Diatom 0.011 0.001 M P 66
Navicula rhynchocephala Pennate Diatom 0.011 0.005 4 2 2 7 M P 62.1 44 78
Nitzschia recta Pennate Diatom 0.011 0.029 2 2 2 7 H P 46.6 43 73
Navicula perminuta Pennate Diatom 0.008 0.001 M P NA
Navicula symmetrica Pennate Diatom 0.008 0.006 M P NA
Diatoma moniliformis Pennate Diatom 0.005 0.002 3 N U 52.8 27 36
Eunotia minor Pennate Diatom 0.005 0.003 1 1 V E 42.4 19 34
Gomphonema subclavatum Pennate Diatom 0.005 0.007 1 2 2 2 N S 44.7 31 33
Mayamaea agrestis Pennate Diatom 0.005 0.000 2 M P 67.8
Navicula veneta Pennate Diatom 0.005 0.001 4 4 3 5 M P 79.7 51 62
Nitzschia intermedia Pennate Diatom 0.005 0.005 2 2 5 H P NA 66 89
Prestauroneis protracta Pennate Diatom 0.005 0.000 3 2 3 5 M P NA
Pinnularia borealis Pennate Diatom 0.005 0.009 1 2 2 2 M P NA
Synedra sp. 2 NAWQA MORALES Pennate Diatom 0.005 0.021 N E NA
Tabellaria flocculosa Pennate Diatom 0.005 0.004 1 2 1 3 N U 18.8 17 32
Thalassiosira pseudonana Centric Diatom 0.005 0.000 3 3 3 6 N U NA
Gomphonema parvulum Pennate Diatom 0.005 0.002 4 4 2 5 N S 42.2 21
Surirella minuta Pennate Diatom 0.004 0.006 3 3 2 5 H P 79.7 69 95
Cyclotella meneghiniana Centric Diatom 0.003 0.004 5 4 3 5 N U 72.6 55 73
Luticola mutica Pennate Diatom 0.003 0.002 1 3 3 5 M P 62.2 59 95
Meridion circulare var. constrictum Pennate Diatom 0.003 0.001 2 2 2 7 N E 43.7 50 72
Navicula rostellata Pennate Diatom 0.003 0.003 2 2 2 5 M P 66.1 48 92
Nitzschia fonticola Pennate Diatom 0.003 0.000 2 2 2 4 H P 82.2 49 80
Rhoicosphenia abbreviata Pennate Diatom 0.003 0.001 2 2 2 5 V S 83.4 72 96
Stephanodiscus hantzschii Centric Diatom 0.003 0.001 4 4 2 6 N U NA
Surirella ovalis Pennate Diatom 0.003 0.071 4 3 4 5 H P NA
Eunotia pectinalis var. undulata Pennate Diatom 0.001 0.006 1 2 1 1 V E 24.3 22 35
Nitzschia acidoclinata Pennate Diatom 0.001 0.000 1 2 1 3 H P 51.6 40 56
Planothidium lanceolatum Pennate Diatom 0.001 0.000 3 3 2 5 V P 72.5 72 91
Tabellaria fenestrata Pennate Diatom 0.001 0.005 1 2 1 2 N U 18.8 16 28

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.