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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-302-2004R (266)
Sample Date: 2004-07-06 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 = C
Attains Class = YES
Reason = Model
Model Result = C
Prob. Class A = 0.00
Prob. Class B = 0.00
Prob. Class C = 0.99
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 14.44 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 26.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 2.17 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 32.00 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 3.74 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) 43.88 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 53.01 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 73.10 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 1.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 12.50 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 96.16 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 41.30 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 73.01 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 = 4 m
Wetted width = 2 m
Depth = 13 cm
Water velocity = 46 cm/s
Riffle = 60 %
Run = 40 %
Pool = 0 %
Canopy Cover = 56 %
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 2004-07-06 9.2 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2004-07-06 7.18 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2004-07-06 673 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2004-07-06 16 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Chloride 2004-07-26 137 13.50 2.00 145.80 1.00 4.00 Milligrams Per Liter
Dissolved Organic Carbon 2004-07-06 2.4 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2004-07-06 0.82 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2004-07-06 4 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2004-07-06 55 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2004-07-06 0.2 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2004-07-06 23 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 4.29 Nuisance algae
Plant 0.48 Not algae
Sand / Mud 36.19 Not algae
Mat Not Visible 6.67 Thin algal layer
Mat Incomplete 41.43 Thin algal layer
Mat <1mm Thick 10.95 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): 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-302-2004R (266)
Sample Date: 2004-07-06 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
Phormidium Filamentous Cyanobacteria 0.715 0.356 42.6 60
Leptolyngbya spp. 1 (Kalina) Filamentous Cyanobacteria 0.058 0.003 NA
Achnanthidium minutissimum Pennate Diatom 0.049 0.033 1 2 2 7 N P 41.2
Chamaesiphon Cyanobacteria 0.029 0.014 NA
Homoeothrix janthina Filamentous Cyanobacteria 0.024 0.008 43 19 21
Stigeoclonium Filamentous Green 0.016 0.110 42.6
Stigeoclonium lubricum Filamentous Green 0.016 0.064 42.6 18 34
Pseudanabaena Filamentous Cyanobacteria 0.012 0.001 NA 71 84
Phormidium minnesotense Filamentous Cyanobacteria 0.011 0.001 42.6
Anabaena Filamentous Cyanobacteria 0.007 0.002 53.1
Navicula gregaria Pennate Diatom 0.007 0.022 4 3 3 5 M P 79.6 66 89
Navicula subrhyncocephala Pennate Diatom 0.006 0.037 M P NA
Navicula lanceolata Pennate Diatom 0.006 0.136 3 3 3 5 M P 77.5 75 98
Meridion circulare Pennate Diatom 0.004 0.035 2 2 2 7 N E 46.5 64 87
Nitzschia palea Pennate Diatom 0.004 0.007 4 5 2 6 H P 60.3 67 89
Psammothidium ventralis Pennate Diatom 0.004 0.002 1 1 1 2 V P 53.3
Rhoicosphenia abbreviata Pennate Diatom 0.003 0.015 2 2 2 5 V S 83.4 72 96
Gomphonema parvulum Pennate Diatom 0.002 0.005 4 4 2 5 N S 42.2 21
Navicula menisculus Pennate Diatom 0.002 0.033 3 3 2 5 M P 64.3 44 72
Planothidium frequentissimum Pennate Diatom 0.002 0.003 3 4 2 V P 65.1 69 92
Synedra rumpens Pennate Diatom 0.001 0.001 2 2 N E 34.3 20 32
Frustulia vulgaris Pennate Diatom 0.001 0.018 1 2 2 4 M P 51.7 62 87
Gomphonema angustatum Pennate Diatom 0.001 0.005 1 1 2 1 N S 58 50 84
Gomphonema pumilum Pennate Diatom 0.001 0.003 2 7 N S 43.6 14 21
Mayamaea permitis Pennate Diatom 0.001 0.000 4 4 2 5 M P 65.3 100 100
Karayevia oblongella Pennate Diatom 0.001 0.000 1 1 2 1 V P 62.2 64 79
Cyclotella meneghiniana Centric Diatom 0.001 0.003 5 4 3 5 N U 72.6 55 73
Eunotia minor Pennate Diatom 0.001 0.009 1 1 V E 42.4 19 34
Eolimna minima Pennate Diatom 0.001 0.000 4 4 2 5 M P 57 64 88
Navicula rhynchocephala Pennate Diatom 0.001 0.011 4 2 2 7 M P 62.1 44 78
Planothidium lanceolatum Pennate Diatom 0.001 0.003 3 3 2 5 V P 72.5 72 91
Psammothidium subatomoides Pennate Diatom 0.001 0.000 1 1 1 2 V P 42.4 20 35
Pseudostaurosira brevistriata Pennate Diatom 0.001 0.002 1 1 2 7 N E 32.2 46 45
Sellaphora seminulum Pennate Diatom 0.001 0.001 4 4 2 5 M P 51.5 67 73
Pseudostaurosira elliptica Pennate Diatom 0.001 0.001 1 2 2 4 N V 44.9
Fragilaria gracilis Pennate Diatom 0.001 0.003 1 1 2 2 N V 30.6 18 22
Sellaphora nyassensis Pennate Diatom 0.001 0.006 M P NA
Nitzschia tubicola Pennate Diatom 0.001 0.009 H P 81.2 70 87
Navicula veneta Pennate Diatom 0.001 0.002 4 4 3 5 M P 79.7 51 62
Navicula cryptocephala Pennate Diatom 0.001 0.005 3 3 2 7 M P 56.3 55 80
Aphanothece clathrata Cyanobacteria 0.001 0.000 43.1
Fragilariforma nitzschioides Pennate Diatom 0.000 0.002 N V NA
Fragilaria vaucheriae Pennate Diatom 0.000 0.001 3 3 2 5 N V 44.2 36
Caloneis bacillum Pennate Diatom 0.000 0.001 2 2 2 4 M P 64.9 72 96
Cocconeis lineata Pennate Diatom 0.000 0.001 3 2 2 5 N P 51.5 62 82
Ctenophora pulchella Pennate Diatom 0.000 0.006 3 5 2 3 N E 49.7
Navicula laterostrata Pennate Diatom 0.000 0.003 1 1 2 M P NA
Navicula paramutica var. binodis Pennate Diatom 0.000 0.000 M P NA
Nitzschia dissipata Pennate Diatom 0.000 0.001 2 2 2 4 H P 60.9 48 75
Nitzschia dissipata var. media Pennate Diatom 0.000 0.002 2 H P 64.7
Nitzschia pumila Pennate Diatom 0.000 0.000 H P 71.2
Planothidium daui Pennate Diatom 0.000 0.000 1 1 2 1 V P NA
Planothidium delicatulum Pennate Diatom 0.000 0.000 4 V P NA
Mayamaea agrestis Pennate Diatom 0.000 0.000 2 M P 67.8
Melosira varians Centric Diatom 0.000 0.002 3 3 2 5 N U 67 67 89
Ulnaria ulna Pennate Diatom 0.000 0.011 3 4 2 N E 34.2 17 21
Staurosirella pinnata var. intercedens Pennate Diatom 0.000 0.001 N V NA

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.