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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: River De Chute - Station 926 Sampled by: Biomonitoring Unit
Town: Easton Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin St. John And Allagash Sample ID: SA-926-2014R (1407)
Sample Date: 2014-07-29 Taxonomist: Academy Of Natural Sciences
Location: 30 M Downstream Of Ladner St. 
Sample comments:
Latitude: 46.61705128
Longitude: -67.79916679

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 = 0.00
Prob. Class C = 0.97
Prob. NA = 0.03

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 1.25 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 14.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 19.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 0.00 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 9.12 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 2.91 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) 44.07 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 55.60 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 74.35 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 0.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 6.67 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 97.09 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 40.62 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 86.32 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 = 14 m
Wetted width = 14 m
Depth = 41 cm
Water velocity = 44 cm/s
Riffle = 50 %
Run = 40 %
Pool = 10 %
Canopy Cover = 4 %
Boulder = 40 %
Cobble = 30 %
Gravel = 20 %
Sand = 10 %
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 2014-07-29 9.6 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2014-07-29 8.63 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2014-07-29 189 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2014-07-29 17.9 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Nitrate + Nitrite As Nitrogen 2014-07-29 0.46 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2014-07-29 2 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2014-07-29 115 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2014-07-29 0.1 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2014-07-29 12 18.00 7.00 48.00 4.00 18.00 Micrograms Per Liter
Viewing Bucket
Viewing Bucket Table
Cover type Percent cover Cover group
Moss 1.27 Not algae
Sand / Mud 27.62 Not algae
Mat Incomplete 37.46 Thin algal layer
Mat <1mm Thick 33.65 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):
Impervious Cover %:
Land Use Table
Cover Type Percent Category
No data No Data No data

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

Site Information
Name: River De Chute - Station 926 Sampled by: Biomonitoring Unit
Town: Easton Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin St. John And Allagash Sample ID: SA-926-2014R (1407)
Sample Date: 2014-07-29 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 0.344 0.092 42.6 60
Pseudanabaena Filamentous Cyanobacteria 0.185 0.007 NA 71 84
Unknown Rhodophyte Florideophycidae (Chantransia) Red Algae 0.131 0.199 47.5 48 68
Achnanthidium pyrenaicum Pennate Diatom 0.109 0.039 N P NA 62 80
Gongrosira Filamentous Green 0.073 0.299 37.3 37
Cocconeis lineata Pennate Diatom 0.047 0.176 3 2 2 5 N P 51.5 62 82
Achnanthidium minutissimum Pennate Diatom 0.040 0.004 1 2 2 7 N P 41.2
Leptolyngbya Filamentous Cyanobacteria 0.029 0.000 38.3 28 75
Encyonema silesiacum Pennate Diatom 0.006 0.005 3 3 2 7 V S 46.9 43 69
Reimeria sinuata Pennate Diatom 0.006 0.003 1 2 2 3 M P 60.9 65 88
Ankistrodesmus falcatus Colonial Green 0.004 0.001 45.7 58 75
Melosira varians Centric Diatom 0.003 0.048 3 3 2 5 N U 67 67 89
Navicula capitatoradiata Pennate Diatom 0.003 0.005 3 3 2 5 M P 68.5 62 78
Navicula tripunctata Pennate Diatom 0.003 0.009 2 2 2 5 M P 69.4 76 88
Cosmarium Desmid 0.002 0.094 NA 18 15
Staurosira construens var. venter Pennate Diatom 0.002 0.000 1 2 2 4 N V 41.3 35 67
Encyonopsis microcephala Pennate Diatom 0.001 0.000 1 1 2 4 V S 34.8 17 24
Eolimna minima Pennate Diatom 0.001 0.000 4 4 2 5 M P 57 64 88
Gomphonema minutum Pennate Diatom 0.001 0.000 2 2 5 N S 54.6 61 55
Navicula cryptotenella Pennate Diatom 0.001 0.001 2 2 7 M P 44.6 61 82
Navicula gregaria Pennate Diatom 0.001 0.001 4 3 3 5 M P 79.6 66 89
Nitzschia acicularis Pennate Diatom 0.001 0.000 4 3 2 5 H P NA 19 85
Nitzschia dissipata Pennate Diatom 0.001 0.001 2 2 2 4 H P 60.9 48 75
Nitzschia palea Pennate Diatom 0.001 0.001 4 5 2 6 H P 60.3 67 89
Nitzschia paleacea Pennate Diatom 0.001 0.000 3 3 2 5 H P 61.3 32 35
Nitzschia pusilla Pennate Diatom 0.001 0.000 2 2 2 H P NA
Ulnaria ulna Pennate Diatom 0.001 0.001 3 4 2 N E 34.2 17 21
Achnanthidium deflexum Pennate Diatom 0.000 0.000 1 2 3 N P 43.5 40 52
Amphora pediculus Pennate Diatom 0.000 0.000 2 2 2 5 M P 76.2 71 93
Encyonema minutum Pennate Diatom 0.000 0.000 2 V S 50.2 21
Fragilaria capucina Pennate Diatom 0.000 0.000 2 2 3 N V 32.9 59 51
Gomphonema micropus Pennate Diatom 0.000 0.000 2 2 2 5 N S 39 72 89
Gomphonema olivaceoides Pennate Diatom 0.000 0.000 1 1 1 3 N S 70.8 63 55
Navicula caterva Pennate Diatom 0.000 0.000 M P NA 87 95
Navicula lanceolata Pennate Diatom 0.000 0.002 3 3 3 5 M P 77.5 75 98
Navicula viridula Pennate Diatom 0.000 0.002 2 3 2 5 M P 70.7 74
Nitzschia recta Pennate Diatom 0.000 0.002 2 2 2 7 H P 46.6 43 73
Nitzschia vermicularis Pennate Diatom 0.000 0.006 1 2 2 7 H P NA
Planothidium frequentissimum Pennate Diatom 0.000 0.000 3 4 2 V P 65.1 69 92

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.