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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Royal River - Station 799 Sampled by: Biomonitoring Unit
Town: Gray Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-799-2005R (414)
Sample Date: 2005-07-12 Taxonomist: Michigan State University
Location: 15m Downstream Of Depot Road
Sample comments:
Latitude: 43.89075923
Longitude: -70.277131

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 = 0.02
Prob. Class C = 0.98
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 19.18 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 26.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 2.50 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 14.17 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 5.24 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) 47.71 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 48.10 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 70.39 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 17.24 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 94.60 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 32.50 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 85.88 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 = 10 m
Wetted width = 7 m
Depth = 54 cm
Water velocity = 97 cm/s
Riffle = 100 %
Canopy Cover = 18 %
Bedrock = 0 %
Boulder = 40 %
Cobble = 40 %
Gravel = 20 %
Sand = 0 %
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 2005-07-12 8 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2005-07-12 7.06 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2005-07-12 129 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2005-07-12 21.6 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Dissolved Organic Carbon 2005-07-12 6.4 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2005-07-12 0.28 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2005-07-12 9 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2005-07-12 22 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2005-07-12 0.5 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2005-07-12 33 18.00 7.00 48.00 4.00 18.00 Micrograms Per Liter
Viewing Bucket
Viewing Bucket Table
Cover type Percent cover Cover group
Mat 1-5mm Thick 0.95 Nuisance algae
Moss 17.14 Not algae
Plant 1.90 Not algae
Sand / Mud 7.62 Not algae
Mat Incomplete 28.57 Thin algal layer
Mat <1mm Thick 43.81 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): 158.6
Impervious Cover %: 6
Land Use Table
Cover Type Percent Category
Highly Urban 0.74 Developed
Urban 1.12 Developed
Residential 5.63 Developed
Water 0.61 Natural
Wetland 7.96 Natural
Forest 68.89 Natural
Grass 10.16 Agriculture
Cleared 0.29 Agriculture
Tilled 2.21 Agriculture

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

Site Information
Name: Royal River - Station 799 Sampled by: Biomonitoring Unit
Town: Gray Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Southern Maine Sample ID: SA-799-2005R (414)
Sample Date: 2005-07-12 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 rivulare Pennate Diatom 0.288 0.056 N P 49.9 39 49
Audouinella Red Algae 0.192 0.489 47.5 54 69
Homoeothrix janthina Filamentous Cyanobacteria 0.087 0.003 43 19 21
Phormidium sp. 2 d5um tapering KMM Maine Filamentous Cyanobacteria 0.058 0.015 42.6
Achnanthidium minutissimum Pennate Diatom 0.050 0.007 1 2 2 7 N P 41.2
Lyngbya Filamentous Cyanobacteria 0.042 0.002 48.5
Chamaesiphon confervicolus Cyanobacteria 0.040 0.090 NA
Phormidium sp. 3 d7um KMM Maine Filamentous Cyanobacteria 0.037 0.017 42.6
Leptolyngbya Filamentous Cyanobacteria 0.029 0.000 38.3 28 75
Encyonema silesiacum Pennate Diatom 0.029 0.025 3 3 2 7 V S 46.9 43 69
Navicula lanceolata Pennate Diatom 0.020 0.092 3 3 3 5 M P 77.5 75 98
Phormidium minnesotense Filamentous Cyanobacteria 0.019 0.000 42.6
Phormidium granulatum Filamentous Cyanobacteria 0.016 0.000 42.6 26
Navicula cryptotenella Pennate Diatom 0.011 0.008 2 2 7 M P 44.6 61 82
Navicula escambia Pennate Diatom 0.006 0.005 1 2 3 5 M P 67.3 42 93
Oscillatoria limosa Filamentous Cyanobacteria 0.006 0.002 NA
Nitzschia palea Pennate Diatom 0.005 0.002 4 5 2 6 H P 60.3 67 89
Fragilaria vaucheriae Pennate Diatom 0.005 0.002 3 3 2 5 N V 44.2 36
Melosira varians Centric Diatom 0.005 0.021 3 3 2 5 N U 67 67 89
Diatoma moniliformis Pennate Diatom 0.005 0.002 3 N U 52.8 27 36
Navicula cryptocephala Pennate Diatom 0.004 0.003 3 3 2 7 M P 56.3 55 80
Cocconeis lineata Pennate Diatom 0.004 0.004 3 2 2 5 N P 51.5 62 82
Gomphonema micropus Pennate Diatom 0.003 0.003 2 2 2 5 N S 39 72 89
Frustulia amphipleuroides Pennate Diatom 0.003 0.058 1 1 1 1 M P 44.5 38 78
Gomphonema parvulum Pennate Diatom 0.002 0.001 4 4 2 5 N S 42.2 21
Prestauroneis protracta Pennate Diatom 0.002 0.002 3 2 3 5 M P NA
Gomphonema rhombicum Pennate Diatom 0.002 0.002 N S 32.1 28 36
Nitzschia paleacea Pennate Diatom 0.002 0.001 3 3 2 5 H P 61.3 32 35
Navicula perminuta Pennate Diatom 0.002 0.000 M P NA
Achnanthidium reimeri Pennate Diatom 0.002 0.000 1 2 V P NA 33 24
Navicula difficillima Pennate Diatom 0.002 0.000 1 1 2 M P NA
Rhoicosphenia abbreviata Pennate Diatom 0.002 0.002 2 2 2 5 V S 83.4 72 96
Nitzschia tubicola Pennate Diatom 0.002 0.002 H P 81.2 70 87
Nitzschia dissipata var. media Pennate Diatom 0.002 0.002 2 H P 64.7
Navicula subrhyncocephala Pennate Diatom 0.002 0.002 M P NA
Nitzschia liebethruthii Pennate Diatom 0.002 0.000 H P 65.8 39 91
Closterium moniliferum Desmid 0.002 0.019 35.9 36
Navicula antonii Pennate Diatom 0.002 0.001 M P 65.4 54 89
Cymbella tumida Pennate Diatom 0.002 0.022 1 1 2 4 V S 57.8 48 78
Eunotia bilunaris Pennate Diatom 0.002 0.003 2 2 2 7 V E 37.6 17 28
Chamaepinnularia bremensis Pennate Diatom 0.001 0.000 M P 64.4
Stauroneis phoenicenteron Pennate Diatom 0.001 0.027 3 2 2 4 M P NA
Staurosirella pinnata Pennate Diatom 0.001 0.000 1 2 2 7 N V 44.2 38 56
Staurosira construens var. venter Pennate Diatom 0.001 0.000 1 2 2 4 N V 41.3 35 67
Navicula gregaria Pennate Diatom 0.001 0.001 4 3 3 5 M P 79.6 66 89
Planothidium lanceolatum Pennate Diatom 0.001 0.000 3 3 2 5 V P 72.5 72 91
Eunotia minor Pennate Diatom 0.001 0.002 1 1 V E 42.4 19 34
Fragilaria capucina Pennate Diatom 0.001 0.001 2 2 3 N V 32.9 59 51

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.