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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Trout Brook - Station 302 Sampled by: Biomonitoring Unit
Town: South Portland Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-302-2003R (207)
Sample Date: 2003-07-09 Taxonomist: Michigan State University
Location: 25m Above Highland Ave. Crossing
Sample comments:
Latitude: 43.63354137
Longitude: -70.24984319

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 = N
Attains Class = NO
Reason = Model
Model Result = N
Prob. Class A = 0.00
Prob. Class B = 0.00
Prob. Class C = 0.18
Prob. NA = 0.82

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 8.23 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 17.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 16.00 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 34.83 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 21.28 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) 51.37 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 53.85 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 76.59 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 21.21 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 78.47 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 47.06 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 87.50 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

Wetted width = 3 m
Depth = 7 cm
Riffle = 0 %
Run = 100 %
Pool = 0 %
Canopy Cover = 46 %
Bedrock = 0 %
Boulder = 0 %
Cobble = 15 %
Gravel = 35 %
Sand = 40 %
Silt = 10 %
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 2003-07-09 9.2 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
Dissolved Oxygen 2003-07-09 9.4 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2003-07-09 7.03 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2003-07-09 734 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2003-07-09 13.3 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Temperature 2003-07-09 14.7 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Chloride 2003-08-11 147 13.50 2.00 145.80 1.00 4.00 Milligrams Per Liter
Dissolved Organic Carbon 2003-07-09 2.6 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2003-07-09 0.78 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2003-07-09 7 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2003-07-09 54 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2003-07-09 0.2 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2003-07-09 18 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): 5.4
Impervious Cover %: 17
Land Use Table
Cover Type Percent Category
Highly Urban 0.34 Developed
Urban 3.26 Developed
Residential 27.58 Developed
Water 0.28 Natural
Wetland 6.02 Natural
Forest 39.90 Natural
Grass 1.38 Agriculture
Cleared 0.11 Agriculture
Tilled 3.70 Agriculture

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

Site Information
Name: Trout Brook - Station 302 Sampled by: Biomonitoring Unit
Town: South Portland Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-302-2003R (207)
Sample Date: 2003-07-09 Taxonomist: Michigan State University
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
Undetermined bg filament 1-25m Cyanobacteria 0.261 0.018 NA
Achnanthidium minutissimum Pennate Diatom 0.208 0.053 1 2 2 7 N P 41.2
Eolimna minima Pennate Diatom 0.112 0.025 4 4 2 5 M P 57 64 88
Phormidium formosum Filamentous Cyanobacteria 0.112 0.022 42.6 23
Audouinella Red Algae 0.068 0.369 47.5 54 69
Gomphonema kobayasii Pennate Diatom 0.032 0.047 N S 71.2 50 79
Chamaesiphon Cyanobacteria 0.023 0.007 NA
Rhoicosphenia abbreviata Pennate Diatom 0.022 0.049 2 2 2 5 V S 83.4 72 96
Navicula gregaria Pennate Diatom 0.021 0.031 4 3 3 5 M P 79.6 66 89
Planothidium frequentissimum Pennate Diatom 0.021 0.014 3 4 2 V P 65.1 69 92
Karayevia oblongella Pennate Diatom 0.018 0.005 1 1 2 1 V P 62.2 64 79
Gomphonema parvulum Pennate Diatom 0.013 0.013 4 4 2 5 N S 42.2 21
Navicula viridula Pennate Diatom 0.011 0.189 2 3 2 5 M P 70.7 74
Sellaphora seminulum Pennate Diatom 0.010 0.004 4 4 2 5 M P 51.5 67 73
Prestauroneis protracta Pennate Diatom 0.010 0.022 3 2 3 5 M P NA
Meridion circulare var. constrictum Pennate Diatom 0.005 0.011 2 2 2 7 N E 43.7 50 72
Hippodonta capitata Pennate Diatom 0.004 0.005 3 3 2 4 M P 66.8 61 89
Cyclotella meneghiniana Centric Diatom 0.004 0.008 5 4 3 5 N U 72.6 55 73
Psammothidium subatomoides Pennate Diatom 0.004 0.001 1 1 1 2 V P 42.4 20 35
Nitzschia tubicola Pennate Diatom 0.004 0.010 H P 81.2 70 87
Encyonema silesiacum Pennate Diatom 0.004 0.006 3 3 2 7 V S 46.9 43 69
Fragilaria vaucheriae Pennate Diatom 0.003 0.003 3 3 2 5 N V 44.2 36
Navicula rhynchocephala Pennate Diatom 0.003 0.015 4 2 2 7 M P 62.1 44 78
Pseudostaurosira brevistriata Pennate Diatom 0.003 0.003 1 1 2 7 N E 32.2 46 45
Gomphonema micropus Pennate Diatom 0.003 0.004 2 2 2 5 N S 39 72 89
Meridion circulare Pennate Diatom 0.002 0.006 2 2 2 7 N E 46.5 64 87
Achnanthidium deflexum Pennate Diatom 0.002 0.001 1 2 3 N P 43.5 40 52
Amphora pediculus Pennate Diatom 0.002 0.001 2 2 2 5 M P 76.2 71 93
Cocconeis placentula var. euglypta Pennate Diatom 0.002 0.003 3 2 2 5 N P 58.2 45 81
Nitzschia acidoclinata Pennate Diatom 0.002 0.001 1 2 1 3 H P 51.6 40 56
Nitzschia agnita Pennate Diatom 0.002 0.001 4 H P NA
Nitzschia dissipata Pennate Diatom 0.002 0.004 2 2 2 4 H P 60.9 48 75
Planothidium lanceolatum Pennate Diatom 0.002 0.002 3 3 2 5 V P 72.5 72 91
Surirella minuta Pennate Diatom 0.002 0.006 3 3 2 5 H P 79.7 69 95
Prestauroneis integra Pennate Diatom 0.002 0.016 3 3 3 5 M P NA
Luticola mutica Pennate Diatom 0.001 0.001 1 3 3 5 M P 62.2 59 95
Eunotia implicata Pennate Diatom 0.001 0.006 1 V E 28.3 16 15
Navicula germainii Pennate Diatom 0.001 0.002 M P NA 51 85
Surirella amphioxys Pennate Diatom 0.001 0.012 2 4 5 H P 61.5 52 94
Eunotia incisa Pennate Diatom 0.001 0.004 1 1 1 1 V E 24.8 18 35

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.