Maine Department of Environmental Protection Logo

 Maine Department of Environmental Protection
 Biological Monitoring Program
 Stream Macroinvertebrate Report

Site Information
Name: Richardson Brook - Station 1117 Sampled by: Biomonitoring Unit
Town: T19 Ed Bpp Method: Rock Bag
Biomonitoring Basin: Penobscot And Downeast Log: 2836
Deployment Date: 2020-07-22 Taxonomist: Michael Cole
Retrieval Date: 2020-08-19 Subsample Factor: 1
Location: Drive 250 Feet Further South On 19 Rd Than S-1116. Park In Small Pull Off On Left. Walk Upstream Through Woods.
Sample comments: Deployment: Visible Flow. ; Retrieval: Visible Flow.
Latitude: 44.92616829
Longitude: -67.49053252

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 left, a downstream image of the sample site.

Classification Attainment and Model Probabilities
Statutory Class = A Model Result = A Final Determination = A Attains Class = YES
Reason = Model
Stage One Model Class A Model Class B or Better Model Class C or Better Model
Prob. Class A = 0.92 Prob. Class A = 1.00 Prob. Class A,B = 1.00 Prob. Class A,B,C = 1.00
Prob. Class B = 0.08 Prob. Class B, C, NA = 0.00 Prob. Class C, NA= 0.00 Prob. NA= 0.00
Prob. Class C = 0.00
Prob. NA = 0.00

Model Variable Plots

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

Boxplots of stream macroinvertebrate model metrics, including range of values from all samples, from reference sites, and this specific sample. Macroinvertebrate model metrics are in a table below, in the section entitled Model Variable Table

Model Variable Table
Variable Sample value All data median All data 10th percentile All data 90th percentile Reference 10th percentile Reference 90th percentile
Total Mean Abundance 79.67 320.67 61.80 1713.20 67.67 734.13
Generic Richness 40.00 37.00 21.00 58.00 24.00 58.00
Plecoptera Mean Abundance 5.00 4.00 0.00 26.67 2.00 37.00
Ephemeroptera Mean Abundance 33.67 44.00 0.67 230.67 11.37 159.27
Shannon-Weiner Generic Diversity 4.36 3.54 2.35 4.38 2.91 4.48
Hilsenhoff Biotic Index 3.62 4.45 3.20 5.99 2.75 4.87
Chironomidae Relative Abundance 0.08 0.23 0.05 0.60 0.05 0.48
Diptera Relative Generic Richness 0.32 0.36 0.23 0.50 0.23 0.45
Hydropsyche Mean Abundance 0.33 11.33 0.00 369.20 0.00 213.26
Cheumatopsyche Mean Abundance 0.00 2.33 0.00 117.87 0.00 21.51
EPT Generic Richness/Diptera Generic Richness 1.15 1.17 0.42 2.25 0.87 2.62
Oligochaeta Relative Abundance 0.00 0.00 0.00 0.04 0.00 0.01
Perlidae Mean Abundance 4.00 0.67 0.00 15.33 0.00 14.93
Tanypodinae Mean Abundance 0.70 3.67 0.00 29.78 0.00 12.49
Chironomini Mean Abundance 1.06 9.76 0.33 102.38 0.00 42.51
Ephemeroptera Relative Abundance 0.42 0.14 0.00 0.45 0.08 0.48
EPT Generic Richness 15.00 15.00 5.00 24.00 12.00 28.00
Summed Mean Abundance of Dicrotendipes, Micropsectra, Parachironomus, Helobdella 0.00 0.33 0.00 17.33 0.00 8.87
Plecoptera Relative Richness 0.05 0.04 0.00 0.12 0.03 0.17
Summed Mean Abundance of Cheumatopsyche, Cricotopus, Tanytarsus, Ablabesmyia 1.76 16.67 0.50 187.73 0.33 55.20
Summed Mean Abundance of Acroneuria, Stenonema, Maccaffertium + 1 14.33 9.31 0.00 70.67 0.00 43.73
EP Generic Richness/14 0.57 0.57 0.07 1.00 0.50 1.21
Presence of Class A Indicator Taxa 0.29 0.14 0.00 0.43 0.00 0.71
Most Abundant Taxa
Taxon Name Percent Abundance
Leucrocuta 14.64 %
Maccaffertium 12.97 %
Oecetis 10.46 %
Paraleptophlebia 9.21 %
Acroneuria 5.02 %

Water Chemistry Plots

 Blue = this sample at deployment. Red = this sample at retrieval. Boxplots = range of all samples. Grey shaded areas = 10th to 90th percentile of reference sites.

Boxplots of stream chemical characteristics, including range of values from all samples, from reference sites, and this specific sample. Stream chemical values are in a table available below in the 'Water Chemistry Tables' section.

Water Chemistry Tables
Field Meters
Parameter Deployment value Retrieval value All data median All data 10th percentile All data 90th percentile Reference 10th percentile Reference 90th percentile Units
Dissolved Oxygen 8.52 8.52 8.61 7.09 10.24 7.80 10.62 Milligrams Per Liter
pH 6.06 6.00 7.11 6.20 7.97 6.00 7.55 Standard Ph Unit
Specific Conductance 19.90 27.40 87.00 25.00 473.70 15.41 67.31 Microsiemens Per Centimeter
Temperature 19.37 16.10 20.10 15.00 24.80 12.80 23.60 Degrees Celcius (Temperature)
Stream characteristics
Parameter Deployment value Retrieval value Units
Bankfull Width 3.9 3.9 Meters
Wetted Width 2.6 2.6 Meters
Depth 20.3 17 Centimeters
Velocity 0.1 0.1 Centimeters Per Second
Boulder Substrate 40.0 Percent
Rubble/Cobble Substrate 50.0 Percent
Gravel Substrate 10.0 Percent
Land Use
Land Use Data Source: MELCD 2004
Watershed Area (sq km): 12.4
Impervious Cover %: 0
Land Use Table
Cover Type Percent Category
Highly Urban 0.69 Developed
Water 1.58 Natural
Wetland 8.78 Natural
Forest 85.77 Natural
Grass 0.52 Agriculture
Tilled 0.28 Agriculture
Barplots of high resolution landcover data from watershed upstream of sample location. Percentages are available in a table on the right

Site Information
Name: Richardson Brook - Station 1117 Sampled by: Biomonitoring Unit
Town: T19 Ed Bpp Method: Rock Bag
Biomonitoring Basin: Penobscot And Downeast Log: 2836
Deployment Date: 2020-07-22 Taxonomist: Michael Cole
Retrieval Date: 2020-08-19 Subsample Factor: 1
Location: Drive 250 Feet Further South On 19 Rd Than S-1116. Park In Small Pull Off On Left. Walk Upstream Through Woods.
Sample comments: Deployment: Visible Flow. ; Retrieval: Visible Flow.
Latitude: 44.92616829
Longitude: -67.49053252
Taxa List
Name Taxonomic Group Count - Actual Count - Adjusted Tolerance (HBI) Relative % Abundance - Actual Relative % Abundance - Adjusted Functional Feeding Group Taxa Code
Leuctra Stonefly 1.00 1.00 1.3 1.3 Shredder LW-09020204020
Acroneuria Stonefly 4.00 5.0 Predator LW-09020209042
Acroneuria lycorias Stonefly 4.00 5.0 LW-09020209042125
Boyeria Dragonfly/Damselfly 1.00 1.67 2 1.3 2.1 Predator LW-09020301004
Boyeria vinosa Dragonfly/Damselfly 0.67 0.8 LW-09020301004012
Corduliidae Dragonfly/Damselfly 1.00 1.00 1.3 1.3 LW-09020305
Calopterygidae Dragonfly/Damselfly 3.67 3.67 4.6 4.6 LW-09020307
Calopteryx Dragonfly/Damselfly 2.67 2.67 5 3.3 3.3 Predator LW-09020307043
Coenagrionidae Dragonfly/Damselfly 1.33 1.33 1.7 1.7 LW-09020309
Argia Dragonfly/Damselfly 2.33 2.33 7 2.9 2.9 Predator LW-09020309048
Baetis Mayfly 0.33 4 0.4 Collector-Gatherer LW-09020401001
Baetis pluto Mayfly 0.33 0.4 LW-09020401001009
Acerpenna Mayfly 0.33 5 0.4 Collector-Gatherer LW-09020401007
Acerpenna pygmaea Mayfly 0.33 0.4 LW-09020401007011
Leucrocuta Mayfly 11.67 11.67 1 14.6 14.6 Scraper LW-09020402011
Maccaffertium Mayfly 1.67 10.33 4 2.1 13.0 Scraper LW-09020402015
Maccaffertium vicarium Mayfly 8.67 10.9 LW-09020402015055
Paraleptophlebia Mayfly 7.33 7.33 1 9.2 9.2 Collector-Gatherer LW-09020406026
Eurylophella Mayfly 3.67 3.67 3 4.6 4.6 Collector-Gatherer LW-09020410036
Microvelia True Bug 0.33 0.33 0.4 0.4 Predator LW-09020510025
Polycentropus Caddisfly 3.33 3.33 6 4.2 4.2 Predator LW-09020603010
Hydropsyche Caddisfly 0.33 4 0.4 Collector-Filterer LW-09020604016
Hydropsyche sparna Caddisfly 0.33 0.4 LW-09020604016032
Micrasema Caddisfly 0.67 0.67 2 0.8 0.8 Shredder LW-09020609044
Lepidostoma Caddisfly 2.00 2.00 1 2.5 2.5 Shredder LW-09020611064
Ceraclea Caddisfly 0.33 0.33 3 0.4 0.4 Collector-Gatherer LW-09020618072
Mystacides Caddisfly 2.00 4 2.5 Collector-Gatherer LW-09020618075
Mystacides sepulchralis Caddisfly 2.00 2.5 LW-09020618075147
Oecetis Caddisfly 8.33 8.33 8 10.5 10.5 Predator LW-09020618078
Nigronia Dobsonfly 0.33 0.4 Predator LW-09020701003
Nigronia serricornis Dobsonfly 0.33 0.4 LW-09020701003003
Chironomidae Fly: Midge 0.33 0.4 LW-09021011
Labrundinia Fly: Midge 0.35 7 0.4 Predator LW-09021011008
Labrundinia pilosella Fly: Midge 0.33 0.4 LW-09021011008022
Thienemannimyia Fly: Midge 0.35 3 0.4 Predator LW-09021011020
Thienemannimyia group Fly: Midge 0.33 0.4 LW-09021011020041
Corynoneura Fly: Midge 0.67 0.70 7 0.8 0.9 Collector-Gatherer LW-09021011036
Nanocladius Fly: Midge 0.33 0.35 3 0.4 0.4 Collector-Gatherer LW-09021011049
Orthocladius Fly: Midge 0.70 6 0.9 Collector-Gatherer LW-09021011050
Orthocladius annectens Fly: Midge 0.67 0.8 LW-09021011050092
Psectrocladius Fly: Midge 0.33 0.35 8 0.4 0.4 Collector-Gatherer LW-09021011056
Tvetenia Fly: Midge 0.35 5 0.4 Collector-Gatherer LW-09021011065
Tvetenia vitracies Fly: Midge 0.33 0.4 LW-09021011065113
Rheotanytarsus Fly: Midge 0.33 0.35 6 0.4 0.4 Collector-Filterer LW-09021011072
Tanytarsus Fly: Midge 1.67 1.76 6 2.1 2.2 Collector-Filterer LW-09021011076
Lauterborniella Fly: Midge 0.33 0.35 0.4 0.4 Collector-Gatherer LW-09021011092
Microtendipes Fly: Midge 0.35 6 0.4 Collector-Filterer LW-09021011094
Microtendipes pedellus group Fly: Midge 0.33 0.4 LW-09021011094166
Phaenopsectra Fly: Midge 0.35 7 0.4 Scraper LW-09021011101
Phaenopsectra punctipes group Fly: Midge 0.33 0.4 LW-09021011101181
Simulium Fly: Black 0.67 0.67 4 0.8 0.8 Collector-Filterer LW-09021012047
Psephenus Beetle 0.33 4 0.4 Scraper LW-09021108058
Psephenus herricki Beetle 0.33 0.4 LW-09021108058028
Dubiraphia Beetle 2.33 6 2.9 LW-09021113064
Dubiraphia quadrinotata Beetle 0.33 0.4 LW-09021113064037
Dubiraphia vittata Beetle 2.00 2.5 LW-09021113064038
Optioservus Beetle 0.67 3 0.8 Scraper LW-09021113067
Optioservus tardella Beetle 0.67 0.8 LW-09021113067052
Amnicola Snail 0.33 0.33 0.4 0.4 Scraper LW-10010104013