Maine Department of Environmental Protection Logo

 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: French Stream - Station 505 Sampled by: Biomonitoring Unit
Town: Exeter Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Penobscot And Downeast Sample ID: SA-505-2001R (73)
Sample Date: 2001-07-12 Taxonomist: Michigan State University
Location: Downstream Site - Crane Road
Sample comments:
Latitude: 44.98844026
Longitude: -69.08498772

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 = 0.00
Prob. Class B = 0.95
Prob. Class C = 0.04
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 1.00 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 28.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 10.87 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 13.51 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 8.48 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) 43.75 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 46.26 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 68.26 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 5.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 4.76 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 87.32 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 28.26 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 20.30 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 = 0 m
Depth = 60 cm
Riffle = 20 %
Run = 60 %
Pool = 20 %
Bedrock = 0 %
Boulder = 20 %
Cobble = 50 %
Gravel = 20 %
Sand = 10 %
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
Specific Conductance 2001-07-12 242 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Dissolved Organic Carbon 2001-07-12 4.9 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2001-07-12 0.12 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2001-07-12 2 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Kjeldahl Nitrogen 2001-07-12 0.4 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2001-07-12 17 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 21.27 Nuisance algae
Mat 1-5mm Thick 6.67 Nuisance algae
Sand / Mud 4.76 Not algae
Mat Not Visible 26.35 Thin algal layer
Mat Incomplete 23.49 Thin algal layer
Mat <1mm Thick 17.46 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): 96.5
Impervious Cover %: 2
Land Use Table
Cover Type Percent Category
Highly Urban 0.06 Developed
Urban 0.30 Developed
Residential 3.69 Developed
Water 0.19 Natural
Wetland 6.15 Natural
Forest 70.57 Natural
Grass 5.23 Agriculture
Tilled 13.78 Agriculture

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

Site Information
Name: French Stream - Station 505 Sampled by: Biomonitoring Unit
Town: Exeter Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Penobscot And Downeast Sample ID: SA-505-2001R (73)
Sample Date: 2001-07-12 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 minutissimum Pennate Diatom 0.419 0.120 1 2 2 7 N P 41.2
Audouinella Red Algae 0.066 0.032 47.5 54 69
Staurosira construens var. venter Pennate Diatom 0.050 0.024 1 2 2 4 N V 41.3 35 67
Pediastrum duplex var. clathratum Colonial Green 0.049 0.017 NA
Scenedesmus brasilienses Colonial Green 0.049 0.003 NA
Scenedesmus acutus Colonial Green 0.049 0.005 NA 61
Achnanthidium deflexum Pennate Diatom 0.038 0.022 1 2 3 N P 43.5 40 52
Oedogonium Filamentous Green 0.029 0.015 37.6 27 47
Scenedesmus ecornis Colonial Green 0.027 0.006 39.9 23 69
Reimeria sinuata Pennate Diatom 0.026 0.027 1 2 2 3 M P 60.9 65 88
Fragilaria gracilis Pennate Diatom 0.018 0.013 1 1 2 2 N V 30.6 18 22
Stigonema mesenteri Filamentous Cyanobacteria 0.015 NA
Staurosira construens Pennate Diatom 0.012 0.021 1 2 2 4 N V 46.8 30 58
Synedra rumpens Pennate Diatom 0.011 0.013 2 2 N E 34.3 20 32
Encyonema minutum Pennate Diatom 0.011 0.019 2 V S 50.2 21
Mougeotia 5-75m Filamentous Green 0.010 0.129 26.9 10 12
Staurosirella pinnata Pennate Diatom 0.009 0.017 1 2 2 7 N V 44.2 38 56
Nitzschia palea Pennate Diatom 0.008 0.006 4 5 2 6 H P 60.3 67 89
Navicula cryptocephala Pennate Diatom 0.007 0.013 3 3 2 7 M P 56.3 55 80
Navicula reichardtiana Pennate Diatom 0.006 0.009 3 2 M P 55.7 51 71
Hippodonta capitata Pennate Diatom 0.006 0.011 3 3 2 4 M P 66.8 61 89
Navicula capitatoradiata Pennate Diatom 0.006 0.024 3 3 2 5 M P 68.5 62 78
Gomphonema micropus Pennate Diatom 0.006 0.020 2 2 2 5 N S 39 72 89
Nitzschia frustulum Pennate Diatom 0.005 0.001 3 2 3 5 H P 50.4 53 88
Planothidium frequentissimum Pennate Diatom 0.005 0.004 3 4 2 V P 65.1 69 92
Delicata delicatula Pennate Diatom 0.004 0.009 1 1 1 1 V S 31.3 21 22
Achnanthidium affine Pennate Diatom 0.004 0.004 1 2 N P 64.7 67
Gomphonema parvulum Pennate Diatom 0.004 0.005 4 4 2 5 N S 42.2 21
Nitzschia dissipata Pennate Diatom 0.003 0.009 2 2 2 4 H P 60.9 48 75
Eolimna minima Pennate Diatom 0.003 0.001 4 4 2 5 M P 57 64 88
Encyonema reichardtii Pennate Diatom 0.003 0.032 1 1 2 3 V S 76.1 66 71
Sellaphora seminulum Pennate Diatom 0.002 0.001 4 4 2 5 M P 51.5 67 73
Tetraedron trigonum Unicellular Green 0.002 0.008 NA
Nitzschia supralitorea Pennate Diatom 0.002 0.001 2 3 2 5 H P 65.4 62 89
Cosmarium biretum var. minus Desmid 0.002 0.252 NA 18 15
Gomphonema truncatum Pennate Diatom 0.002 0.030 2 2 2 4 N S 36.5 47 44
Nitzschia palea var. debilis Pennate Diatom 0.002 0.001 1 1 1 H P 53.4 47 79
Nitzschia acicularis Pennate Diatom 0.002 0.001 4 3 2 5 H P NA 19 85
Encyonema auerswaldii Pennate Diatom 0.002 0.011 V S NA
Navicula gregaria Pennate Diatom 0.002 0.003 4 3 3 5 M P 79.6 66 89
Frustulia krammeri Pennate Diatom 0.002 0.005 1 1 1 1 M P 20.3 38 54
Amphora copulata Pennate Diatom 0.002 0.025 2 2 2 5 M P 53.5 48 73
Cocconeis placentula var. euglypta Pennate Diatom 0.002 0.003 3 2 2 5 N P 58.2 45 81
Karayevia laterostrata Pennate Diatom 0.002 0.003 1 1 1 1 V P 59 58 84
Caloneis bacillum Pennate Diatom 0.002 0.003 2 2 2 4 M P 64.9 72 96
Eunotia bilunaris Pennate Diatom 0.001 0.004 2 2 2 7 V E 37.6 17 28
Eucocconeis laevis Pennate Diatom 0.001 0.001 1 1 1 1 V P 29.5 17 18
Geissleria decussis Pennate Diatom 0.001 0.002 1 2 4 M P 44.5 40 80
Navicula tripunctata Pennate Diatom 0.001 0.008 2 2 2 5 M P 69.4 76 88
Surirella minuta Pennate Diatom 0.001 0.004 3 3 2 5 H P 79.7 69 95
Nitzschia perminuta Pennate Diatom 0.001 0.001 1 1 2 2 H P 56.7 53 76
Navicula notha Pennate Diatom 0.001 0.001 M P 37.4 20 34
Psammothidium chlidanos Pennate Diatom 0.001 0.001 V P 32.5 16 14
Geissleria paludosa Pennate Diatom 0.001 0.001 1 1 1 M P NA
Karayevia clevei Pennate Diatom 0.001 0.001 2 2 2 4 V P 54.3 72

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.