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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: East Cathance Stream - Station 859 Sampled by: Biomonitoring Unit
Town: Bowdoin Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Androscoggin Sample ID: SA-859-2008R (742)
Sample Date: 2008-07-01 Taxonomist: Academy Of Natural Sciences
Location: Upstream Of Rte. 125
Sample comments: Cobble/Log Substrate
Latitude: 44.033663
Longitude: -69.9501232

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 = 0.23
Prob. Class B = 0.77
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 1.10 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 21.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 26.09 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 16.39 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 0.01 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) 39.24 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 34.94 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 52.50 58.62 38.59 76.56 0.00 53.06 <90th percentile
Intolerant algae percent species 12.00 6.00 1.00 14.00 5.00 23.00 >10th percentile
Intolerant algae richness 4.17 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 96.26 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 54.37 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 = 9 m
Depth = 46 cm
Water velocity = 23 cm/s
Riffle = 0 %
Run = 90 %
Pool = 10 %
Canopy Cover = 40 %
Bedrock = 0 %
Boulder = 0 %
Cobble = 2 %
Gravel = 0 %
Sand = 40 %
Silt = 58 %
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 2008-07-01 8 8.60 7.00 10.23 7.80 10.62 Milligrams Per Liter
pH 2008-07-01 6.14 7.12 6.21 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 2008-07-01 56 88.55 25.00 492.00 15.41 67.31 Microsiemens Per Centimeter
Temperature 2008-07-01 19.8 20.00 14.70 24.70 12.80 23.60 Degrees Celcius (Temperature)
Dissolved Organic Carbon 2008-07-01 7.3 4.90 2.30 9.30 2.00 9.42 Milligrams Per Liter
Nitrate + Nitrite As Nitrogen 2008-07-01 0.02 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 2008-07-01 2 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Alkalinity 2008-07-01 12 19.50 4.44 113.20 2.00 21.00 Milligrams Per Liter
Total Kjeldahl Nitrogen 2008-07-01 0.5 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 2008-07-01 27 18.00 7.00 48.00 4.00 18.00 Micrograms Per Liter
Viewing Bucket

No viewing bucket data available

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): 30.9
Impervious Cover %: 2
Land Use Table
Cover Type Percent Category
Highly Urban 0.04 Developed
Urban 0.11 Developed
Residential 2.22 Developed
Wetland 5.51 Natural
Forest 88.09 Natural
Grass 3.60 Agriculture
Cleared 0.04 Agriculture
Tilled 0.38 Agriculture

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

Site Information
Name: East Cathance Stream - Station 859 Sampled by: Biomonitoring Unit
Town: Bowdoin Method: Rock Scrapings 1 Inch Circles
Biomonitoring Basin Androscoggin Sample ID: SA-859-2008R (742)
Sample Date: 2008-07-01 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
Leptolyngbya Filamentous Cyanobacteria 0.604 0.021 38.3 28 75
Phormidium Filamentous Cyanobacteria 0.257 0.217 42.6 60
Symplocastrum pencillatum Filamentous Cyanobacteria 0.090 0.086 NA
Batrachospermum Red Algae 0.033 0.600 27.6 27 32
Unknown Rhodophyte Florideophycidae (Chantransia) Red Algae 0.014 0.066 47.5 48 68
Cosmarium angulosum Desmid 0.001 0.007 26 18 15
Melosira varians Centric Diatom 0.000 0.000 3 3 2 5 N U 67 67 89
Fragilaria gracilis Pennate Diatom 0.000 0.000 1 1 2 2 N V 30.6 18 22
Fragilaria vaucheriae Pennate Diatom 0.000 0.000 3 3 2 5 N V 44.2 36
Meridion circulare var. constrictum Pennate Diatom 0.000 0.000 2 2 2 7 N E 43.7 50 72
Staurosira construens var. venter Pennate Diatom 0.000 0.000 1 2 2 4 N V 41.3 35 67
Ulnaria ulna Pennate Diatom 0.000 0.001 3 4 2 N E 34.2 17 21
Tabellaria flocculosa (strain III) Pennate Diatom 0.000 0.000 1 2 1 3 N U 18.8 17 32
Karayevia oblongella Pennate Diatom 0.000 0.000 1 1 2 1 V P 62.2 64 79
Achnanthidium minutissimum Pennate Diatom 0.000 0.000 1 2 2 7 N P 41.2
Achnanthidium rivulare Pennate Diatom 0.000 0.000 N P 49.9 39 49
Eucocconeis laevis Pennate Diatom 0.000 0.000 1 1 1 1 V P 29.5 17 18
Karayevia ploenensis Pennate Diatom 0.000 0.000 1 1 2 4 V P NA
Planothidium frequentissimum Pennate Diatom 0.000 0.000 3 4 2 V P 65.1 69 92
Psammothidium bioretii Pennate Diatom 0.000 0.000 1 1 2 3 V P 31.2 15 12
Psammothidium subatomoides Pennate Diatom 0.000 0.000 1 1 1 2 V P 42.4 20 35
Cocconeis placentula Pennate Diatom 0.000 0.000 3 2 2 5 N P NA 30 82
Eunotia bilunaris Pennate Diatom 0.000 0.000 2 2 2 7 V E 37.6 17 28
Eunotia exigua Pennate Diatom 0.000 0.000 2 3 2 7 V E 21.7 13 13
Eunotia flexuosa Pennate Diatom 0.000 0.000 1 1 1 2 V E 16.7 25 45
Eunotia incisa Pennate Diatom 0.000 0.000 1 1 1 1 V E 24.8 18 35
Eunotia tenella Pennate Diatom 0.000 0.000 1 1 1 1 V E NA 2
Cymbella cymbiformis Pennate Diatom 0.000 0.000 1 1 2 2 V S NA
Cymbopleura naviculiformis Pennate Diatom 0.000 0.000 2 2 2 5 V S 51.6 35 53
Encyonema minutum Pennate Diatom 0.000 0.000 2 V S 50.2 21
Amphora ovalis Pennate Diatom 0.000 0.000 2 2 2 5 M P NA
Gomphonema americobtusatum Pennate Diatom 0.000 0.000 N S NA
Gomphonema parvulius Pennate Diatom 0.000 0.000 N S NA 17 22
Gomphonema parvulum Pennate Diatom 0.000 0.000 4 4 2 5 N S 42.2 21
Gomphonema sp. 2 ANS NEW JERSEY KCP Pennate Diatom 0.000 0.000 N S 15.1 24 29
Brachysira microcephala Pennate Diatom 0.000 0.000 2 1 2 2 M P 18 12 18
Chamaepinnularia soehrensis var. hassiaca Pennate Diatom 0.000 0.000 1 1 1 1 M P NA
Diadesmis contenta Pennate Diatom 0.000 0.000 1 2 2 7 M P NA
Frustulia saxonica Pennate Diatom 0.000 0.000 1 1 1 1 M P NA
Geissleria kriegeri Pennate Diatom 0.000 0.000 M P NA
Hippodonta capitata Pennate Diatom 0.000 0.000 3 3 2 4 M P 66.8 61 89
Navicula antonii Pennate Diatom 0.000 0.000 M P 65.4 54 89
Navicula cryptocephala Pennate Diatom 0.000 0.000 3 3 2 7 M P 56.3 55 80
Navicula cryptotenella Pennate Diatom 0.000 0.000 2 2 7 M P 44.6 61 82
Eolimna minima Pennate Diatom 0.000 0.000 4 4 2 5 M P 57 64 88
Navicula notha Pennate Diatom 0.000 0.000 M P 37.4 20 34
Navicula rhynchocephala Pennate Diatom 0.000 0.000 4 2 2 7 M P 62.1 44 78
Navicula tenelloides Pennate Diatom 0.000 0.000 1 1 2 5 M P 75.8 51 62
Pinnularia Pennate Diatom 0.000 0.000 M P NA
Pinnularia perinterrupta Pennate Diatom 0.000 0.000 M P NA
Placoneis clementis Pennate Diatom 0.000 0.000 1 2 3 4 M P NA
Sellaphora pupula Pennate Diatom 0.000 0.000 3 3 2 4 M P 46.8 38 75
Rhoicosphenia abbreviata Pennate Diatom 0.000 0.000 2 2 2 5 V S 83.4 72 96
Nitzschia acidoclinata Pennate Diatom 0.000 0.000 1 2 1 3 H P 51.6 40 56
Nitzschia archibaldii Pennate Diatom 0.000 0.000 2 2 2 5 H P 60
Nitzschia dissipata Pennate Diatom 0.000 0.000 2 2 2 4 H P 60.9 48 75
Nitzschia draveillensis Pennate Diatom 0.000 0.000 2 5 H P NA
Nitzschia fonticola Pennate Diatom 0.000 0.000 2 2 2 4 H P 82.2 49 80
Nitzschia frustulum Pennate Diatom 0.000 0.000 3 2 3 5 H P 50.4 53 88
Nitzschia microcephala Pennate Diatom 0.000 0.000 3 3 2 5 H P NA
Nitzschia nana Pennate Diatom 0.000 0.000 1 2 2 3 H P NA
Nitzschia palea Pennate Diatom 0.000 0.000 4 5 2 6 H P 60.3 67 89
Nitzschia tubicola Pennate Diatom 0.000 0.000 H P 81.2 70 87
Eunotia implicata Pennate Diatom 0.000 0.000 1 V E 28.3 16 15
Gomphonema pygmaeum Pennate Diatom 0.000 0.000 N S 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.