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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Red Brook - Station 413 Sampled by: Watersheds
Town: Scarborough Method: Brick Scrapings
Biomonitoring Basin Southern Maine Sample ID: SA-413-2000B (102)
Sample Date: 2000-07-16 Taxonomist: Michigan State University
Location: Adjacent To Lazyboy Furniture - 50m Downstream Of Back End Parking Lot
Sample comments:
Latitude: 43.62643466
Longitude: -70.34602939

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 =
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 2.72 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 24.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 14.29 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 12.80 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 6.14 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) 44.41 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 40.81 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 63.67 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 6.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 11.36 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 89.52 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 28.57 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 65.34 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 = 28 cm
Bedrock = 0 %
Boulder = 0 %
Cobble = 0 %
Gravel = 0 %
Sand = 65 %
Silt = 35 %
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
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): 5.8
Impervious Cover %: 11
Land Use Table
Cover Type Percent Category
Highly Urban 1.82 Developed
Urban 2.24 Developed
Residential 9.52 Developed
Water 1.97 Natural
Wetland 14.47 Natural
Forest 50.02 Natural
Grass 6.08 Agriculture
Cleared 0.08 Agriculture
Tilled 0.14 Agriculture

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

Site Information
Name: Red Brook - Station 413 Sampled by: Watersheds
Town: Scarborough Method: Brick Scrapings
Biomonitoring Basin Southern Maine Sample ID: SA-413-2000B (102)
Sample Date: 2000-07-16 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
Achnanthidium minutissimum Pennate Diatom 0.475 0.098 1 2 2 7 N P 41.2
Gomphonema parvulum Pennate Diatom 0.057 0.049 4 4 2 5 N S 42.2 21
Scenedesmus denticulatus Colonial Green 0.049 0.003 NA
Scenedesmus opoliensis Colonial Green 0.049 0.016 NA
Cocconeis placentula var. euglypta Pennate Diatom 0.031 0.036 3 2 2 5 N P 58.2 45 81
Fragilaria vaucheriae Pennate Diatom 0.031 0.027 3 3 2 5 N V 44.2 36
Ankistrodesmus convolutus Colonial Green 0.024 0.002 NA
Scenedesmus armatus Colonial Green 0.024 0.007 NA
Scenedesmus quadricauda Colonial Green 0.024 0.003 46.4 26 36
Navicula cryptocephala Pennate Diatom 0.019 0.026 3 3 2 7 M P 56.3 55 80
Encyonema minutum Pennate Diatom 0.019 0.023 2 V S 50.2 21
Staurosirella pinnata Pennate Diatom 0.017 0.023 1 2 2 7 N V 44.2 38 56
Fragilaria gracilis Pennate Diatom 0.012 0.009 1 1 2 2 N V 30.6 18 22
Amphora copulata Pennate Diatom 0.012 0.105 2 2 2 5 M P 53.5 48 73
Navicula gregaria Pennate Diatom 0.011 0.013 4 3 3 5 M P 79.6 66 89
Nitzschia palea var. debilis Pennate Diatom 0.011 0.003 1 1 1 H P 53.4 47 79
Encyonema silesiacum Pennate Diatom 0.010 0.012 3 3 2 7 V S 46.9 43 69
Hippodonta capitata Pennate Diatom 0.007 0.009 3 3 2 4 M P 66.8 61 89
Amphora pediculus Pennate Diatom 0.007 0.004 2 2 2 5 M P 76.2 71 93
Eucocconeis laevis Pennate Diatom 0.007 0.005 1 1 1 1 V P 29.5 17 18
Rossithidium linearis Pennate Diatom 0.007 0.003 V P 32 24 56
Tabellaria flocculosa Pennate Diatom 0.007 0.049 1 2 1 3 N U 18.8 17 32
Closterium dydymotocum Desmid 0.006 0.160 NA
Pseudostaurosira brevistriata Pennate Diatom 0.006 0.008 1 1 2 7 N E 32.2 46 45
Diatoma moniliformis Pennate Diatom 0.006 0.002 3 N U 52.8 27 36
Meridion circulare Pennate Diatom 0.006 0.018 2 2 2 7 N E 46.5 64 87
Navicula rhynchocephala Pennate Diatom 0.005 0.024 4 2 2 7 M P 62.1 44 78
Aulacoseira alpigena Centric Diatom 0.005 0.001 1 1 1 1 N U 43.4 25 51
Nitzschia dissipata Pennate Diatom 0.005 0.010 2 2 2 4 H P 60.9 48 75
Staurosira construens var. venter Pennate Diatom 0.005 0.002 1 2 2 4 N V 41.3 35 67
Frustulia vulgaris Pennate Diatom 0.004 0.022 1 2 2 4 M P 51.7 62 87
Nitzschia palea Pennate Diatom 0.004 0.002 4 5 2 6 H P 60.3 67 89
Surirella amphioxys Pennate Diatom 0.004 0.041 2 4 5 H P 61.5 52 94
Nitzschia lacuum Pennate Diatom 0.004 0.005 1 1 2 3 H P 64
Cymbopleura amphicephala Pennate Diatom 0.004 0.016 1 1 2 2 V S NA
Neidium alpinum Pennate Diatom 0.003 0.005 1 1 1 M P NA
Ulnaria ulna Pennate Diatom 0.003 0.052 3 4 2 N E 34.2 17 21
Gomphonema gracile Pennate Diatom 0.002 0.004 1 1 2 3 N S 21.9 13 20
Diadesmis contenta Pennate Diatom 0.002 0.000 1 2 2 7 M P NA
Stauroneis kriegeri Pennate Diatom 0.002 0.002 2 2 2 4 M P 48.4 59 96
Navicula tenelloides Pennate Diatom 0.002 0.001 1 1 2 5 M P 75.8 51 62
Psammothidium subatomoides Pennate Diatom 0.002 0.000 1 1 1 2 V P 42.4 20 35
Navicula notha Pennate Diatom 0.002 0.002 M P 37.4 20 34
Pinnularia interrupta Pennate Diatom 0.002 0.015 1 1 1 2 M P NA
Cyclotella meneghiniana Centric Diatom 0.001 0.001 5 4 3 5 N U 72.6 55 73
Planothidium frequentissimum Pennate Diatom 0.001 0.000 3 4 2 V P 65.1 69 92
Planothidium rostratum Pennate Diatom 0.001 0.001 3 3 2 5 V P 56.6 48 96
Sellaphora seminulum Pennate Diatom 0.001 0.000 4 4 2 5 M P 51.5 67 73
Navicula veneta Pennate Diatom 0.001 0.001 4 4 3 5 M P 79.7 51 62
Karayevia clevei Pennate Diatom 0.001 0.001 2 2 2 4 V P 54.3 72
Eunotia formica Pennate Diatom 0.001 0.081 1 1 2 3 V E NA 33 52
Eunotia rhomboidea Pennate Diatom 0.001 0.001 1 1 1 1 V E 15.8 9 1

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.