MBSS Site Summary for: COCA-205-N-2003
Located on UT HORSEPEN BRANCH in the Potomac River MO Cnty watershed,
8-digit code: 02140202.
This stream was visited in the spring on 4/14/2003 and again in the summer on 8/7/2003.
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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Poor - 2.7 / 5.0
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Benthic IBI
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Poor - 2.0 / 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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1,252 acres
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An example of a forested stream.
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Urban Land Use
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2 %
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Agricultural Land Use
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38 %
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Forested Land Use
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58 %
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Stream Water Quality:
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| Water temperature |
21.4 ° C
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| Dissolved oxygen (DO) |
3.3 mg/L
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Dissolved oxygen levels measured in the stream were very low (3.3 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.86 |
| Conductivity |
192 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
546.2 µeq/L |
| Dissolved organic carbon (DOC) |
6.9 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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| Eastern Box Turtle |
| Eastern Painted Turtle |
| Fowler's Toad |
| Marbled Salamander |
| Northern Green Frog |
| Northern Red-Bellied Turtle |
| Northern Ring-Necked Snake |
| Northern Spring Peeper |
| Pickerel Frog |
| Red-Spotted Newt |
| Spotted Salamander |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Tubificidae |
Aquatic Worm
|
101 |
| Lumbriculidae |
Worm
|
7 |
| Orthocladius |
Non-Biting Midges
|
5 |
| Ameletus |
Combmouthed Minnow Mayfly
|
5 |
| Tipulidae |
Cranefly
|
4 |
| Chaetocladius |
Non-Biting Midges
|
4 |
| Polypedilum |
Non-Biting Midges
|
4 |
| Diptera |
True Fly
|
4 |
| Ablabesmyia |
Non-Biting Midge
|
2 |
| Tabanidae |
Horse Fly
|
2 |
| Parachironomus |
|
2 |
| Leuctra |
Rolled-Winged Stonefly
|
1 |
| Gammarus |
Amphipod
|
1 |
| Endochironomus |
|
1 |
| Palaemonetes |
|
1 |
| Bezzia |
Biting Midge
|
1 |
| Ceratopogonidae |
Biting Midge
|
1 |
| Probezzia |
Biting Midges
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1 |
| Diamesa |
Bloodworm
|
1 |
| Neophylax |
Caddisfly
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1 |
| Orthocladiinae |
Midge
|
1 |
| Musculium |
Fingernail Clam
|
1 |
| Prostoma |
Freshwater Nemertean (Ribbon Worm)
|
1 |
| Clioperla |
Green-Winged Stonefly
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1 |
| Paraphaenocladius |
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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