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 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Jock Stream - Station 547 Sampled by: Biomonitoring Unit
Town: Monmouth Method: Periphytometer
Biomonitoring Basin Kennebec Sample ID: SA-547-1999P (14)
Sample Date: 1999-07-28 Taxonomist: Michigan State University
Location: Carver Rd Bridge
Sample comments:
Latitude: 44.19825319
Longitude: -69.98641367

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 =
Attains Class =
Reason =
Model Result =
Prob. Class A =
Prob. Class B =
Prob. Class C =
Prob. NA =

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 1.06 0.90 0.00 9.15 0.00 1.08 <90th percentile
Nutrient-tolerant diatom richness 20.00 8.00 3.00 17.00 0.00 8.00 <90th percentile
Intermediate diatom richness 29.00 19.00 11.00 28.80 9.00 25.30 10th to 90th percentile
Intolerant algae percent species 15.38 18.75 3.70 42.27 22.12 72.41 >10th percentile
Motile diatom percent abundance 9.73 8.49 1.55 31.56 0.00 11.59 <90th percentile
Tolerant algae percent abundance 3.31 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) 40.28 42.67 37.09 49.07 0.00 42.34 <90th percentile
Nitrogen Index (all algae) 42.64 38.64 26.81 51.56 0.00 35.58 <90th percentile
Phosphorus Index (all algae) 63.74 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 6.00 6.25 0.00 16.00 0.00 7.14 <90th percentile
Salt-tolerant diatom percent richness 88.04 89.95 61.14 98.30 45.42 97.96 10th to 90th percentile
Tolerant algae percent richness 28.85 16.67 0.00 41.38 0.00 14.29 <90th percentile
Nutrient- tolerant diatom percent abundance 64.64 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 = 2 m
Depth = 150 cm
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 1999-07-28 0.03 0.08 0.02 0.61 0.01 0.09 Milligrams Per Liter
Orthophosphate As Phosphorus 1999-07-28 4 2.00 1.00 11.00 1.00 3.00 Micrograms Per Liter
Total Kjeldahl Nitrogen 1999-07-28 0.7 0.40 0.20 0.60 0.10 0.50 Milligrams Per Liter
Total Phosphorus 1999-07-28 47 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): 38.1
Impervious Cover %: 4
Land Use Table
Cover Type Percent Category
Highly Urban 0.26 Developed
Urban 0.28 Developed
Residential 3.30 Developed
Water 0.06 Natural
Wetland 6.74 Natural
Forest 58.57 Natural
Grass 27.68 Agriculture
Cleared 0.66 Agriculture
Tilled 2.45 Agriculture

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

Site Information
Name: Jock Stream - Station 547 Sampled by: Biomonitoring Unit
Town: Monmouth Method: Periphytometer
Biomonitoring Basin Kennebec Sample ID: SA-547-1999P (14)
Sample Date: 1999-07-28 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
Oedogonium Filamentous Green 0.548 0.242 37.6 27 47
Achnanthidium minutissimum Pennate Diatom 0.166 0.031 1 2 2 7 N P 41.2
Planothidium rostratum Pennate Diatom 0.055 0.032 3 3 2 5 V P 56.6 48 96
Mougeotia 5-75m Filamentous Green 0.054 0.457 26.9 10 12
Fragilaria gracilis Pennate Diatom 0.021 0.024 1 1 2 2 N V 30.6 18 22
Scenedesmus quadricauda Colonial Green 0.021 0.002 46.4 26 36
Scenedesmus brasilienses Colonial Green 0.016 0.001 NA
Cocconeis lineata Pennate Diatom 0.014 0.016 3 2 2 5 N P 51.5 62 82
Ctenophora pulchella Pennate Diatom 0.010 0.049 3 5 2 3 N E 49.7
Staurosira construens var. venter Pennate Diatom 0.009 0.003 1 2 2 4 N V 41.3 35 67
Euastrum binale Desmid 0.008 0.010 NA
Planothidium frequentissimum Pennate Diatom 0.008 0.004 3 4 2 V P 65.1 69 92
Nitzschia supralitorea Pennate Diatom 0.007 0.001 2 3 2 5 H P 65.4 62 89
Melosira varians Centric Diatom 0.006 0.026 3 3 2 5 N U 67 67 89
Navicula notha Pennate Diatom 0.005 0.004 M P 37.4 20 34
Gomphonema clavatum Pennate Diatom 0.005 0.013 1 1 1 4 N S 43.6
Eolimna minima Pennate Diatom 0.004 0.001 4 4 2 5 M P 57 64 88
Eunotia implicata Pennate Diatom 0.003 0.014 1 V E 28.3 16 15
Mayamaea atomus Pennate Diatom 0.003 0.000 2 4 2 6 M P NA
Achnanthidium deflexum Pennate Diatom 0.003 0.001 1 2 3 N P 43.5 40 52
Navicula cryptocephala Pennate Diatom 0.003 0.003 3 3 2 7 M P 56.3 55 80
Gomphonema acuminatum Pennate Diatom 0.003 0.020 2 2 2 5 N S 26.7 13 15
Pseudostaurosira brevistriata Pennate Diatom 0.002 0.002 1 1 2 7 N E 32.2 46 45
Nitzschia palea var. debilis Pennate Diatom 0.002 0.001 1 1 1 H P 53.4 47 79
Sellaphora seminulum Pennate Diatom 0.002 0.001 4 4 2 5 M P 51.5 67 73
Gomphonema gracile Pennate Diatom 0.002 0.004 1 1 2 3 N S 21.9 13 20
Amphora pediculus Pennate Diatom 0.002 0.001 2 2 2 5 M P 76.2 71 93
Eunotia naegelii Pennate Diatom 0.001 0.003 1 1 1 1 V E 22.3 22 41
Nitzschia lacuum Pennate Diatom 0.001 0.001 1 1 2 3 H P 64
Rhoicosphenia abbreviata Pennate Diatom 0.001 0.002 2 2 2 5 V S 83.4 72 96
Fragilaria capitellata Pennate Diatom 0.001 0.000 3 2 5 N V 50.3 22
Gomphonema parvulum Pennate Diatom 0.001 0.000 4 4 2 5 N S 42.2 21
Cyclotella meneghiniana Centric Diatom 0.001 0.001 5 4 3 5 N U 72.6 55 73
Gomphonema pumilum Pennate Diatom 0.001 0.001 2 7 N S 43.6 14 21
Rossithidium linearis Pennate Diatom 0.001 0.000 V P 32 24 56
Nitzschia capitellata Pennate Diatom 0.001 0.001 5 4 6 H P 75.7 49 76
Eunotia bilunaris Pennate Diatom 0.001 0.002 2 2 2 7 V E 37.6 17 28
Gomphonema truncatum Pennate Diatom 0.001 0.005 2 2 2 4 N S 36.5 47 44
Eunotia circumborealis Pennate Diatom 0.001 0.005 1 V E NA
Gomphonema kobayasii Pennate Diatom 0.001 0.001 N S 71.2 50 79
Synedra rumpens Pennate Diatom 0.001 0.000 2 2 N E 34.3 20 32
Encyonema minutum Pennate Diatom 0.001 0.001 2 V S 50.2 21
Fallacia tenera Pennate Diatom 0.001 0.000 M P NA
Staurosirella pinnata Pennate Diatom 0.001 0.001 1 2 2 7 N V 44.2 38 56
Fragilaria sepes Pennate Diatom 0.001 0.000 1 1 1 2 N V 32.1 18 39
Amphipleura pellucida Pennate Diatom 0.001 0.002 2 4 2 2 M P 43.8 20 59
Hippodonta capitata Pennate Diatom 0.001 0.001 3 3 2 4 M P 66.8 61 89
Nitzschia subacicularis Pennate Diatom 0.001 0.000 1 2 2 7 H P NA
Navicula rostellata Pennate Diatom 0.001 0.002 2 2 2 5 M P 66.1 48 92
Nitzschia amphibia Pennate Diatom 0.001 0.001 3 3 2 5 H P 79.8 53 93
Nitzschia palea Pennate Diatom 0.001 0.001 4 5 2 6 H P 60.3 67 89
Navicula gregaria Pennate Diatom 0.001 0.001 4 3 3 5 M P 79.6 66 89
Planothidium lanceolatum Pennate Diatom 0.000 0.000 3 3 2 5 V P 72.5 72 91
Staurosira construens Pennate Diatom 0.000 0.000 1 2 2 4 N V 46.8 30 58
Gomphonema minutum Pennate Diatom 0.000 0.000 2 2 5 N S 54.6 61 55
Diadesmis contenta Pennate Diatom 0.000 0.000 1 2 2 7 M P NA
Ulnaria ulna Pennate Diatom 0.000 0.005 3 4 2 N E 34.2 17 21
Navicula reichardtiana Pennate Diatom 0.000 0.000 3 2 M P 55.7 51 71
Psammothidium subatomoides Pennate Diatom 0.000 0.000 1 1 1 2 V P 42.4 20 35

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.