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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: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-474-2015R (1515)
Sample Date: 2015-07-01 Taxonomist: Academy Of Natural Sciences
Location: Park On Freedom Dr., Access Trail System From Cul-De-Sac.
Sample comments:
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 = C
Attains Class = NO
Reason = Model
Model Result = C
Prob. Class A = 0.00
Prob. Class B = 0.00
Prob. Class C = 0.73
Prob. NA = 0.27

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 5.27 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 15.00 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 9.38 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 38.60 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 14.98 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) 46.82 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 46.78 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 70.38 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 3.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 16.67 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 84.81 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 34.38 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 19.35 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 = 24 cm
Water velocity = 28 cm/s
Riffle = 45 %
Run = 45 %
Pool = 10 %
Canopy Cover = 52 %
Bedrock = 0 %
Boulder = 25 %
Cobble = 50 %
Gravel = 5 %
Sand = 20 %
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 2015-07-01 8.95 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2015-07-01 7.44 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2015-07-01 267.5 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2015-07-01 16.4 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Viewing Bucket
Viewing Bucket Table
Cover type Percent cover Cover group
Filament 1-5cm Long 1.27 Nuisance algae
Freshwater Sponge 1.27 Not algae
Moss 0.63 Not algae
Sand / Mud 11.43 Not algae
Mat Incomplete 10.79 Thin algal layer
Mat <1mm Thick 74.60 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: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-474-2015R (1515)
Sample Date: 2015-07-01 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
Unknown Rhodophyte Florideophycidae (Chantransia) Red Algae 0.251 0.522 47.5 48 68
Leptolyngbya Filamentous Cyanobacteria 0.159 0.003 38.3 28 75
Homoeothrix janthina Filamentous Cyanobacteria 0.136 0.007 43 19 21
Nitzschia dissipata Pennate Diatom 0.108 0.133 2 2 2 4 H P 60.9 48 75
Achnanthidium minutissimum Pennate Diatom 0.087 0.014 1 2 2 7 N P 41.2
Achnanthidium rivulare Pennate Diatom 0.079 0.018 N P 49.9 39 49
Pseudanabaena Filamentous Cyanobacteria 0.065 0.003 NA 71 84
Scenedesmus acutus Colonial Green 0.017 0.008 NA 61
Staurosira construens var. venter Pennate Diatom 0.015 0.005 1 2 2 4 N V 41.3 35 67
Navicula gregaria Pennate Diatom 0.012 0.016 4 3 3 5 M P 79.6 66 89
Encyonema silesiacum Pennate Diatom 0.010 0.034 3 3 2 7 V S 46.9 43 69
Fragilaria capucina Pennate Diatom 0.008 0.018 2 2 3 N V 32.9 59 51
Staurosirella pinnata Pennate Diatom 0.007 0.003 1 2 2 7 N V 44.2 38 56
Cocconeis placentula Pennate Diatom 0.004 0.010 3 2 2 5 N P NA 30 82
Navicula perminuta Pennate Diatom 0.004 0.002 M P NA
Nitzschia palea Pennate Diatom 0.004 0.004 4 5 2 6 H P 60.3 67 89
Reimeria sinuata Pennate Diatom 0.004 0.002 1 2 2 3 M P 60.9 65 88
Staurastrum punctulatum Desmid 0.003 0.060 NA 15 21
Achnanthidium pyrenaicum Pennate Diatom 0.002 0.001 N P NA 62 80
Cocconeis lineata Pennate Diatom 0.002 0.013 3 2 2 5 N P 51.5 62 82
Melosira varians Centric Diatom 0.002 0.039 3 3 2 5 N U 67 67 89
Surirella brebissonii var. kuetzingii Pennate Diatom 0.002 0.010 3 3 2 5 H P NA
Planothidium lanceolatum Pennate Diatom 0.002 0.004 3 3 2 5 V P 72.5 72 91
Brachysira microcephala Pennate Diatom 0.001 0.000 2 1 2 2 M P 18 12 18
Cryptomonas Cryptophyte 0.001 0.007 NA
Cyclotella meneghiniana Centric Diatom 0.001 0.002 5 4 3 5 N U 72.6 55 73
Diatoma moniliformis Pennate Diatom 0.001 0.001 3 N U 52.8 27 36
Discostella pseudostelligera Centric Diatom 0.001 0.000 3 3 2 5 N U 28.6 38 86
Encyonema minutum Pennate Diatom 0.001 0.000 2 V S 50.2 21
Fragilaria gracilis Pennate Diatom 0.001 0.000 1 1 2 2 N V 30.6 18 22
Gomphonema minusculum Pennate Diatom 0.001 0.000 N S NA 38 51
Gomphonema parvulum Pennate Diatom 0.001 0.001 4 4 2 5 N S 42.2 21
Karayevia clevei Pennate Diatom 0.001 0.000 2 2 2 4 V P 54.3 72
Navicula canalis Pennate Diatom 0.001 0.001 2 5 M P NA 50 89
Navicula cryptocephala Pennate Diatom 0.001 0.001 3 3 2 7 M P 56.3 55 80
Navicula germainii Pennate Diatom 0.001 0.003 M P NA 51 85
Navicula namibica Pennate Diatom 0.001 0.000 M P NA
Humidophila schmassmannii Pennate Diatom 0.001 0.000 M P 45.4 39 47
Navicula veneta Pennate Diatom 0.001 0.001 4 4 3 5 M P 79.7 51 62
Psammothidium subatomoides Pennate Diatom 0.001 0.000 1 1 1 2 V P 42.4 20 35
Surirella amphioxys Pennate Diatom 0.001 0.014 2 4 5 H P 61.5 52 94
Surirella angusta Pennate Diatom 0.001 0.003 2 2 2 5 H P 65.4 57 96
Surirella minuta Pennate Diatom 0.001 0.002 3 3 2 5 H P 79.7 69 95
Trachelomonas Euglenoid 0.001 0.035 NA
Nitzschia perminuta Pennate Diatom 0.001 0.000 1 1 2 2 H P 56.7 53 76

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.