Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: West Branch Sheepscot River - Station 268 Sampled by: Biomonitoring Unit
Town: China Method: Rock Scrapings 1 Inch Circles
Sample Date: 2002-07-08 Sample ID: SA-268-2002R (118)
Location: Weeks Mills - 100 Ft Upstream Of Dirigo Rd Crossing. Park In Dirt Parking Area At End Of Dirt Road, Walk South Toward Stream Crossing, Cross Road And Walk Through Brush/Trees A Short Distance To Stream

Model Results and Variables

 Blue = this sample. Boxplots = range of all samples. Grey shaded areas = 90th and/or 10th percentile of reference site values.

Statutory Class = AA
Final Determination = A
Attains Class = YES
Reason = Model
Model Result = A
Prob. Class A = 0.76
Prob. Class B = 0.24
Prob. Class C = 0.00
Prob. NA = 0.00
Additional Metrics

Stream Characteristics and Water Chemistry

 Blue = this sample. Boxplots = range of all samples. Grey shaded areas = 10th to 90th percentile of reference site values

Wetted width = 4 m
Depth = 33 cm
Water velocity = 25 cm/s
Riffle = 20 %
Run = 70 %
Pool = 10 %
Bedrock = 0 %
Boulder = 10 %
Cobble = 60 %
Gravel = 20 %
Sand = 5 %
Silt = 5 %
Clay = 0 %

Viewing Bucket and Land Use
Statutory Class: AA
Nutrient Response Indicator Criterion: <19% Nuisance Algae Cover
Nuisance Algae in Survey: 2.5 % cover
Meets Nutrient Response Indicator Criterion: Yes

Site Information
Name: West Branch Sheepscot River - Station 268 Sampled by: Biomonitoring Unit
Town: China Method: Rock Scrapings 1 Inch Circles
Sample Date: 2002-07-08 Sample ID: SA-268-2002R (118)
Taxa List (See key at end of report)
Name Group RA RB Oxy Sap Sal Tr Mot GF Tol TN TP
Achnanthidium minutissimum Pennate Diatom 0.536 0.014 1 2 2 7 N P 41.2 NA NA
Oedogonium 15-20  µm Filamentous Green 0.113 0.417 37.6 27 47
Scenedesmus acutiformis Colonial Green 0.086 0.003 NA NA NA
Achnanthidium deflexum Pennate Diatom 0.072 0.004 1 2 3 N P 43.5 40 52
Synedra rumpens Pennate Diatom 0.022 0.002 2 2 N E 34.3 20 32
Stauridium tetras Colonial Green 0.021 0.001 35.2 NA NA
Scenedesmus quadricauda Colonial Green 0.021 0.001 46.4 26 36
Closterium Desmid 0.019 0.208 NA NA NA
Staurastrum orbiculare Desmid 0.011 0.026 NA NA NA
Encyonopsis microcephala Pennate Diatom 0.010 0.000 1 1 2 4 V S 34.8 17 24
Navicula notha Pennate Diatom 0.010 0.001 M P 37.4 20 34
Staurosira construens var. venter Pennate Diatom 0.010 0.000 1 2 2 4 N V 41.3 35 67
Gomphosphaeria aponina var. delicatula Cyanobacteria 0.008 0.009 NA NA NA
Gomphonema parvulum Pennate Diatom 0.007 0.001 4 4 2 5 N S 42.2 21 NA
Cocconeis placentula var. lineata Pennate Diatom 0.006 0.001 3 2 2 5 N P 51.5 62 82
Gomphonema pumilum Pennate Diatom 0.006 0.001 2 7 N S 43.6 14 21
Encyonema minutum Pennate Diatom 0.005 0.001 2 V S 50.2 21 NA
Encyonema silesiacum Pennate Diatom 0.005 0.001 3 3 2 7 V S 46.9 43 69
Xanthidium antilopaeum Desmid 0.005 0.275 NA NA NA
Calothrix Filamentous Cyanobacteria 0.003 0.003 29.1 9 15
Cocconeis placentula var. euglypta Pennate Diatom 0.003 0.001 3 2 2 5 N P 58.2 45 81
Cosmarium margaritatum var. rotundatum Desmid 0.003 0.022 NA 18 15
Fragilaria vaucheriae var. capitellata Pennate Diatom 0.002 0.000 3 2 5 N V 50.3 22 NA
Navicula cryptocephala Pennate Diatom 0.002 0.000 3 3 2 7 M P 56.3 55 80
Nitzschia paleacea Pennate Diatom 0.002 0.000 3 3 2 5 H P 61.3 32 35
Nitzschia palea Pennate Diatom 0.002 0.000 4 5 2 6 H P 60.3 67 89
Brachysira microcephala Pennate Diatom 0.001 0.000 2 1 2 2 M P 18 12 18
Eucocconeis laevis Pennate Diatom 0.001 0.000 1 1 1 1 V P 29.5 17 18
Eunotia praerupta Pennate Diatom 0.001 0.003 1 1 1 2 V E NA NA NA
Fragilaria sepes Pennate Diatom 0.001 0.000 1 1 1 2 N V 32.1 18 39
Geissleria acceptata Pennate Diatom 0.001 0.000 1 2 1 M P 50.8 80 89
Ulnaria ulna Pennate Diatom 0.001 0.003 3 4 2 N E 34.2 17 21
Encyonema neogracile Pennate Diatom 0.001 0.000 1 1 1 2 V S 24 7 NA
Fragilaria gracilis Pennate Diatom 0.001 0.000 1 1 2 2 N V 30.6 18 22
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.