Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Algae Report

Site Information
Name: Machias River (Downeast) - Station 499 Sampled by: Biomonitoring Unit
Town: Day Block Twp Method: Rock Scrapings 1 Inch Circles
Sample Date: 2006-07-11 Sample ID: SA-499-2006R (550)
Location: Below Rt. 9 Crossing, S-684 Was Merged With This Site 3/8/13

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 = 1.00
Prob. Class B = 0.00
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 = 20 m
Depth = 50 cm
Water velocity = 65 cm/s
Riffle = 30 %
Run = 70 %
Bedrock = 0 %
Boulder = 50 %
Cobble = 30 %
Gravel = 10 %
Sand = 10 %
Silt = 0 %
Clay = 0 %

Viewing Bucket and Land Use
Statutory Class: AA
Nutrient Response Indicator Criterion: <19% Nuisance Algae Cover
Nuisance Algae in Survey: 10.2 % cover
Meets Nutrient Response Indicator Criterion: Yes

Site Information
Name: Machias River (Downeast) - Station 499 Sampled by: Biomonitoring Unit
Town: Day Block Twp Method: Rock Scrapings 1 Inch Circles
Sample Date: 2006-07-11 Sample ID: SA-499-2006R (550)
Taxa List (See key at end of report)
Name Group RA RB Oxy Sap Sal Tr Mot GF Tol TN TP
Homoeothrix janthina Filamentous Cyanobacteria 0.267 0.002 43 19 21
Calothrix Filamentous Cyanobacteria 0.122 0.034 29.1 9 15
Achnanthidium minutissimum Pennate Diatom 0.099 0.007 1 2 2 7 N P 41.2 NA NA
Eunotia incisa Pennate Diatom 0.058 0.039 1 1 1 1 V E 24.8 18 35
Tabellaria flocculosa Pennate Diatom 0.058 0.048 1 2 1 3 N U 18.8 17 32
Batrachospermum Red Algae 0.045 0.116 27.6 27 32
Gomphonema cf. parvulum MESLAP4 Pennate Diatom 0.045 0.100 4 4 2 5 N S 42.2 NA NA
Eunotia pectinalis Pennate Diatom 0.034 0.192 1 2 1 3 V E 12.9 NA NA
Synedra rumpens Pennate Diatom 0.030 0.006 2 2 N E 34.3 20 32
Fragilaria gracilis Pennate Diatom 0.019 0.006 1 1 2 2 N V 30.6 18 22
Eunotia implicata Pennate Diatom 0.018 0.080 1 V E 28.3 16 15
Gomphonema gracile Pennate Diatom 0.016 0.028 1 1 2 3 N S 21.9 13 20
Staurosira construens var. venter Pennate Diatom 0.016 0.003 1 2 2 4 N V 41.3 35 67
Brachysira microcephala Pennate Diatom 0.012 0.004 2 1 2 2 M P 18 12 18
Eunotia glacialis Pennate Diatom 0.012 0.011 1 1 1 2 V E NA NA NA
Eunotia rhomboidea Pennate Diatom 0.011 0.007 1 1 1 1 V E 15.8 9 1
Aulacoseira distans Centric Diatom 0.010 0.005 1 1 1 1 N U NA NA NA
Closterium dianae var. brevius Desmid 0.009 0.066 NA NA NA
Gomphonema micropus Pennate Diatom 0.009 0.005 2 2 2 5 N S 39 72 89
Eunotia exigua Pennate Diatom 0.008 0.002 2 3 2 7 V E 21.7 13 13
Ulnaria ulna Pennate Diatom 0.008 0.083 3 4 2 N E 34.2 17 21
Encyonema neogracile Pennate Diatom 0.007 0.004 1 1 1 2 V S 24 7 NA
Eunotia bilunaris Pennate Diatom 0.006 0.007 2 2 2 7 V E 37.6 17 28
Gomphonema MESLAP1 Pennate Diatom 0.006 0.014 N S 15.1 NA NA
Discostella stelligera Centric Diatom 0.005 0.002 2 N U NA 51 NA
Encyonema silesiacum Pennate Diatom 0.005 0.003 3 3 2 7 V S 46.9 43 69
Eunotia paludosa Pennate Diatom 0.005 0.003 1 1 1 1 V E 19.9 NA NA
Gomphonema minutum Pennate Diatom 0.005 0.001 2 2 5 N S 54.6 61 55
Rossithidium linearis Pennate Diatom 0.005 0.001 V P 32 24 56
Fragilariforma virescens Pennate Diatom 0.005 0.007 1 1 1 2 N V 23 13 13
Eunotia flexuosa Pennate Diatom 0.004 0.019 1 1 1 2 V E 16.7 25 45
Psammothidium bioretii Pennate Diatom 0.004 0.007 1 1 2 3 V P 31.2 15 12
Psammothidium grischunum fo. daonensis Pennate Diatom 0.004 0.001 1 1 1 1 V P 30.2 31 39
Semiorbis hemicyclus Pennate Diatom 0.003 0.003 V E NA NA NA
Frustulia crassinervia Pennate Diatom 0.003 0.003 1 1 1 1 M P 24.7 27 61
Gomphonema affine Pennate Diatom 0.003 0.006 1 2 2 3 N S 34.3 NA NA
Aulacoseira valida Centric Diatom 0.002 0.004 N U NA NA NA
Cavinula cocconeiformis Pennate Diatom 0.002 0.024 1 1 1 2 M P 37.5 NA NA
Eunotia zasuminensis Pennate Diatom 0.002 0.000 V E NA NA NA
Meridion circulare var. constrictum Pennate Diatom 0.002 0.001 2 2 2 7 N E 43.7 50 72
Navicula angusta Pennate Diatom 0.002 0.013 1 1 1 1 M P 11.8 NA NA
Ulnaria acus Pennate Diatom 0.002 0.005 2 3 2 5 N E 31.7 29 48
Fragilariforma strangulata Pennate Diatom 0.002 0.003 N V NA NA NA
Caloneis macedonica Pennate Diatom 0.001 0.012 M P NA NA NA
Cocconeis placentula var. lineata Pennate Diatom 0.001 0.002 3 2 2 5 N P 51.5 62 82
Ulnaria oxyrhyncus Pennate Diatom 0.001 0.003 N E 18.3 NA NA
Eolimna minima Pennate Diatom 0.001 0.000 4 4 2 5 M P 57 64 88
Navicula notha Pennate Diatom 0.001 0.000 M P 37.4 20 34
Navicula radiosa Pennate Diatom 0.001 0.002 2 2 2 4 M P 41.8 34 73
Pinnularia gibba Pennate Diatom 0.001 0.002 3 3 2 7 M P NA NA NA
Pinnularia stomatophora Pennate Diatom 0.001 0.004 1 1 1 1 M P NA NA NA
Platessa stewartii Pennate Diatom 0.001 0.000 V P 40.6 29 52
Sellaphora pupula Pennate Diatom 0.001 0.001 3 3 2 4 M P 46.8 38 75
Staurosirella pinnata Pennate Diatom 0.001 0.000 1 2 2 7 N V 44.2 38 56
Fragilaria vaucheriae Pennate Diatom 0.001 0.000 3 3 2 5 N V 44.2 36 NA
Geissleria punctifera Pennate Diatom 0.001 0.000 M P NA NA 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.