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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Piscataquis River - Station 152 Sampled by: Biomonitoring Unit
Town: Dover-Foxcroft Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Penobscot And Downeast Sample ID: SA-152-2001R (81)
Sample Date: 2001-07-16 Taxonomist: Michigan State University
Location: 1 Km Below Dover - Foxcroft Potw
Sample comments:
Latitude: 45.18563052
Longitude: -69.16803792

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 = B
Attains Class = YES
Reason = Model
Model Result = B
Prob. Class A = 0.03
Prob. Class B = 0.96
Prob. Class C = 0.00
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 2.06 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 10.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 23.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 21.62 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 21.41 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 3.08 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) 43.44 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 37.06 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 58.66 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 8.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 12.12 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 91.05 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 16.22 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 24.53 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 = 48 m
Depth = 80 cm
Riffle = 35 %
Run = 50 %
Pool = 15 %
Bedrock = 30 %
Boulder = 35 %
Cobble = 30 %
Gravel = 5 %
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
Nitrate + Nitrite As Nitrogen 2001-07-16 0.01 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2001-07-16 5 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Kjeldahl Nitrogen 2001-07-16 0.4 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2001-07-16 21 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 >1cm Long 35.24 Nuisance algae
Mat 1-5mm Thick 13.33 Nuisance algae
Mat 5mm-2cm Thick 0.95 Nuisance algae
Sand / Mud 0.32 Not algae
Mat Not Visible 3.17 Thin algal layer
Mat Incomplete 25.08 Thin algal layer
Mat <1mm Thick 21.90 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): 930.5
Impervious Cover %: 1
Land Use Table
Cover Type Percent Category
Highly Urban 0.21 Developed
Urban 0.15 Developed
Residential 3.50 Developed
Water 2.12 Natural
Wetland 3.29 Natural
Forest 87.42 Natural
Grass 1.30 Agriculture
Cleared 0.04 Agriculture
Tilled 1.78 Agriculture

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

Site Information
Name: Piscataquis River - Station 152 Sampled by: Biomonitoring Unit
Town: Dover-Foxcroft Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Penobscot And Downeast Sample ID: SA-152-2001R (81)
Sample Date: 2001-07-16 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
Schizothrix Filamentous Cyanobacteria 0.581 0.036 NA
Achnanthidium minutissimum Pennate Diatom 0.059 0.009 1 2 2 7 N P 41.2
Phormidium formosum Filamentous Cyanobacteria 0.056 0.002 42.6 23
Lyngbya Filamentous Cyanobacteria 0.042 0.003 48.5
Ulnaria ulna Pennate Diatom 0.036 0.537 3 4 2 N E 34.2 17 21
Navicula cryptotenella Pennate Diatom 0.029 0.026 2 2 7 M P 44.6 61 82
Encyonema minutum Pennate Diatom 0.020 0.019 2 V S 50.2 21
Gomphonema pumilum Pennate Diatom 0.020 0.015 2 7 N S 43.6 14 21
Stigeoclonium Filamentous Green 0.019 0.006 42.6
Phormidium tergestinium Filamentous Cyanobacteria 0.014 0.002 42.6 53
Chroococcus varius Cyanobacteria 0.013 0.000 NA
Oscillatoria sancta Filamentous Cyanobacteria 0.012 0.002 NA
Anabaena Filamentous Cyanobacteria 0.010 0.005 53.1
Scenedesmus armatus Colonial Green 0.010 0.002 NA
Fragilaria sepes Pennate Diatom 0.007 0.005 1 1 1 2 N V 32.1 18 39
Gomphonema ventricosum Pennate Diatom 0.006 0.014 1 1 1 1 N S NA
Navicula cryptocephala Pennate Diatom 0.005 0.005 3 3 2 7 M P 56.3 55 80
Cymbella tumida Pennate Diatom 0.005 0.072 1 1 2 4 V S 57.8 48 78
Gomphonema truncatum Pennate Diatom 0.004 0.035 2 2 2 4 N S 36.5 47 44
Tabellaria flocculosa Pennate Diatom 0.004 0.019 1 2 1 3 N U 18.8 17 32
Fragilaria gracilis Pennate Diatom 0.004 0.002 1 1 2 2 N V 30.6 18 22
Brachysira microcephala Pennate Diatom 0.003 0.001 2 1 2 2 M P 18 12 18
Cocconeis placentula var. euglypta Pennate Diatom 0.003 0.002 3 2 2 5 N P 58.2 45 81
Gomphonema augur Pennate Diatom 0.003 0.016 1 2 2 4 N S NA
Melosira varians Centric Diatom 0.003 0.009 3 3 2 5 N U 67 67 89
Nitzschia agnita Pennate Diatom 0.003 0.001 4 H P NA
Nitzschia supralitorea Pennate Diatom 0.003 0.000 2 3 2 5 H P 65.4 62 89
Reimeria sinuata Pennate Diatom 0.003 0.001 1 2 2 3 M P 60.9 65 88
Scenedesmus ecornis Colonial Green 0.003 0.001 39.9 23 69
Cosmarium ordinatum Desmid 0.002 0.019 NA 18 15
Encyonopsis microcephala Pennate Diatom 0.002 0.000 1 1 2 4 V S 34.8 17 24
Closterium dianae var. arcuatum Desmid 0.002 0.008 NA
Rossithidium linearis Pennate Diatom 0.002 0.000 V P 32 24 56
Staurastrum cf. dilatatum Desmid 0.002 0.084 NA
Closterium littorale Desmid 0.001 0.004 NA
Cymbella affinis Pennate Diatom 0.001 0.003 1 2 2 5 V S 36.4 36 39
Cymbella cistula Pennate Diatom 0.001 0.024 2 2 2 5 V S 23.7
Euastrum binale Desmid 0.001 0.001 NA
Fragilaria tenera Pennate Diatom 0.001 0.002 1 1 1 2 N V 31.9 27 41
Gomphonema clevei Pennate Diatom 0.001 0.001 N S 31.3
Gomphonema parvulum Pennate Diatom 0.001 0.001 4 4 2 5 N S 42.2 21
Navicula veneta Pennate Diatom 0.001 0.001 4 4 3 5 M P 79.7 51 62
Nitzschia perminuta Pennate Diatom 0.001 0.000 1 1 2 2 H P 56.7 53 76
Karayevia clevei Pennate Diatom 0.001 0.000 2 2 2 4 V P 54.3 72
Nitzschia amphibia Pennate Diatom 0.001 0.001 3 3 2 5 H P 79.8 53 93
Cyclotella meneghiniana Centric Diatom 0.000 0.000 5 4 3 5 N U 72.6 55 73
Synedra famelica Pennate Diatom 0.000 0.000 1 1 2 3 N V NA
Adlafia bryophila Pennate Diatom 0.000 0.000 1 1 1 3 M P 38.2 20 59
Adlafia minuscula Pennate Diatom 0.000 0.000 4 2 1 1 M P NA 96
Navicula radiosafallax Pennate Diatom 0.000 0.001 M P 36.3
Nitzschia frustulum Pennate Diatom 0.000 0.000 3 2 3 5 H P 50.4 53 88

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.