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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-474-2010R (943)
Sample Date: 2010-06-29 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 = 0.12
Prob. Class C = 0.88
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 6.50 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 13.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 21.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 5.88 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 11.00 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 3.46 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) 46.11 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 46.33 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 69.92 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 2.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 16.13 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 94.87 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 32.35 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 29.93 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: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-474-2010R (943)
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
Phormidium Filamentous Cyanobacteria 0.231 0.031 42.6 60
Unknown Rhodophyte Florideophycidae (Chantransia) Red Algae 0.216 0.165 47.5 48 68
Achnanthidium rivulare Pennate Diatom 0.137 0.011 N P 49.9 39 49
Chamaesiphon amethystinus Cyanobacteria 0.122 0.021 NA
Pseudanabaena Filamentous Cyanobacteria 0.080 0.001 NA 71 84
Achnanthidium minutissimum Pennate Diatom 0.079 0.004 1 2 2 7 N P 41.2
Achnanthidium deflexum Pennate Diatom 0.022 0.002 1 2 3 N P 43.5 40 52
Fragilaria gracilis Pennate Diatom 0.012 0.001 1 1 2 2 N V 30.6 18 22
Gongrosira Filamentous Green 0.010 0.017 37.3 37
Synedra rumpens Pennate Diatom 0.009 0.002 2 2 N E 34.3 20 32
Achnanthidium pyrenaicum Pennate Diatom 0.008 0.001 N P NA 62 80
Navicula cryptocephala Pennate Diatom 0.007 0.003 3 3 2 7 M P 56.3 55 80
Cymbella tumida Pennate Diatom 0.006 0.030 1 1 2 4 V S 57.8 48 78
Navicula gregaria Pennate Diatom 0.006 0.002 4 3 3 5 M P 79.6 66 89
Closterium eboracense Desmid 0.004 0.001 NA
Encyonema silesiacum Pennate Diatom 0.004 0.002 3 3 2 7 V S 46.9 43 69
Navicula rhynchocephala Pennate Diatom 0.004 0.002 4 2 2 7 M P 62.1 44 78
Reimeria sinuata Pennate Diatom 0.004 0.001 1 2 2 3 M P 60.9 65 88
Synedra sp. 8 NAWQA MORALES Pennate Diatom 0.004 0.038 N E NA 33 48
Closterium moniliferum Desmid 0.003 0.618 35.9 36
Cocconeis lineata Pennate Diatom 0.003 0.005 3 2 2 5 N P 51.5 62 82
Melosira varians Centric Diatom 0.003 0.022 3 3 2 5 N U 67 67 89
Diatoma moniliformis Pennate Diatom 0.002 0.001 3 N U 52.8 27 36
Gomphonema parvulius Pennate Diatom 0.002 0.000 N S NA 17 22
Nitzschia inconspicua Pennate Diatom 0.002 0.000 3 3 3 5 H P 83.7 69 98
Surirella angusta Pennate Diatom 0.002 0.004 2 2 2 5 H P 65.4 57 96
Chamaepinnularia musicola Pennate Diatom 0.001 0.000 1 1 1 1 M P NA
Encyonema minutum Pennate Diatom 0.001 0.000 2 V S 50.2 21
Fragilaria vaucheriae Pennate Diatom 0.001 0.000 3 3 2 5 N V 44.2 36
Frustulia vulgaris Pennate Diatom 0.001 0.001 1 2 2 4 M P 51.7 62 87
Gomphonema angustatum Pennate Diatom 0.001 0.000 1 1 2 1 N S 58 50 84
Gomphonema parvulum Pennate Diatom 0.001 0.000 4 4 2 5 N S 42.2 21
Navicula canalis Pennate Diatom 0.001 0.000 2 5 M P NA 50 89
Navicula germainii Pennate Diatom 0.001 0.001 M P NA 51 85
Navicula notha Pennate Diatom 0.001 0.000 M P 37.4 20 34
Navicula symmetrica Pennate Diatom 0.001 0.001 M P NA
Nitzschia palea var. debilis Pennate Diatom 0.001 0.000 1 1 1 H P 53.4 47 79
Nitzschia recta Pennate Diatom 0.001 0.002 2 2 2 7 H P 46.6 43 73
Nitzschia sociabilis Pennate Diatom 0.001 0.000 2 2 2 5 H P NA
Planothidium lanceolatum Pennate Diatom 0.001 0.000 3 3 2 5 V P 72.5 72 91
Rhoicosphenia abbreviata Pennate Diatom 0.001 0.001 2 2 2 5 V S 83.4 72 96
Surirella brebissonii Pennate Diatom 0.001 0.001 3 H P 100 50 80
Surirella minuta Pennate Diatom 0.001 0.002 3 3 2 5 H P 79.7 69 95
Tabellaria flocculosa Pennate Diatom 0.001 0.000 1 2 1 3 N U 18.8 17 32
Cocconeis pediculus Pennate Diatom 0.001 0.003 2 2 3 5 N P 72.3 68 88

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.