MBSS Site Summary for: PRLN-626-S-2009
Located on Mill Run in the Potomac River L N Branch watershed,
8-digit code: 02141001.
This stream was visited in the spring on 4/28/2009 and again in the summer on 7/2/2009.
Index of Biotic Integrity (IBI) Results:
An Index of Biotic Integrity (IBI) is a scientific tool used to identify and classify stream health. An IBI associates anthropogenic influences on a stream or with biological condition in the stream, and is formulated using data developed from biosurveys.
Details on the development and application of MBSS IBIs are in this document.
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Fish IBI
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Good - 4.0 / 5.0
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Benthic IBI
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Good - 5.0 / 5.0
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Land Use
Land use can provide important information for determining stream health.
(Hint: Screen readers will announce definitions; mouse users can hover over dotted text.)
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Catchment area
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470 acres
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An example of a forested stream.
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Urban Land Use
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0.5 %
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Agricultural Land Use
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2 %
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Forested Land Use
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63.6 %
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Stream Water Quality:
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| Water temperature |
15.2 ° C
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| Dissolved oxygen (DO) |
9.7 mg/L
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| pH (lab) |
7.76 |
| Conductivity |
117 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
593.5 µeq/L |
| Dissolved organic carbon (DOC) |
0.8884 mg/L |
Biological Stream Condition:
Surveys of the organisms living within a stream can give indications of stream health. Species richness, or the number of different species present, as well as indicator species (species whose presence, absence or abundance can serve as a measure of environmental conditions) are informative for stream health.
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The following 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Common name |
Count |
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Blacknose Dace
|
42 |
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Blue Ridge Sculpin
|
16 |
Electrofishing to sample fish communities.
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| Eastern American Toad |
| Northern Green Frog |
| Northern Two-Lined Salamander |
| Red-Spotted Newt |
| Seal Salamander |
| Cambarus bartonii bartonii |
| Japanese Stiltgrass |
| Wineberry |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Amphinemura |
Spring Stonefly
|
22 |
| Diplectrona |
Net-Spinning Caddisfly
|
12 |
| Epeorus |
Mayfly
|
8 |
| Ephemerella |
Sulphur Mayfly
|
6 |
| Leuctridae |
Rolledwinged Stonefly
|
6 |
| Baetis |
Blue-Winged Olive Mayfly
|
5 |
| Cinygmula |
Dark Red Quill Mayfly
|
5 |
| Paraleptophlebia |
Blue Quill Mayfly
|
4 |
| Drunella |
Blue-Winged Olive Mayfly
|
4 |
| Neophylax |
Caddisfly
|
4 |
| Stempellina |
|
3 |
| Perlidae |
Common Stonefly
|
3 |
| Chloroperlidae |
Green Stonefly
|
3 |
| Tanytarsus |
Non-Biting Midges
|
3 |
| Paraphaenocladius |
Non-Biting Midges
|
3 |
| Baetidae |
Small Minnow Mayfly
|
3 |
| Diphetor |
Mayfly
|
2 |
| Tanytarsini |
Non-Biting Midges
|
2 |
| Micropsectra |
Non-Biting Midges
|
2 |
| Leptophlebiidae |
Pronggilled Mayfly
|
2 |
| Agapetus |
Tiny Black Short-Horned Caddisfly
|
2 |
| Pteronarcys |
Giant Stonefly
|
2 |
| Ameletus |
Combmouthed Minnow Mayfly
|
2 |
| Heptageniidae |
Flathead Mayfly
|
1 |
| Dicranota |
Hairy-Eyed Cranefly
|
1 |
| Leuctra |
Rolled-Winged Stonefly
|
1 |
| Bezzia |
Biting Midge
|
1 |
| Prosimulium |
Black Fly
|
1 |
| Simulium |
Black Fly
|
1 |
| Gomphidae |
Clubtail Dragonfly
|
1 |
| Polycentropus |
Tube Maker Caddisfly
|
1 |
| Psephenus |
Water Penny
|
1 |
| Optioservus |
Riffle Beetle
|
1 |
| Tvetenia |
Non-Biting Midges
|
1 |
| Parametriocnemus |
Non-Biting Midges
|
1 |
| Stenacron |
Mayfly
|
1 |
| Eukiefferiella |
Non-Biting Midges
|
1 |
Sampling with a kick net.
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Information disclaimer: The information and data on this page is for guidance and general planning purposes only. It should not be used to make decisions on specific matters.
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