MBSS Site Summary for: NANJ-331-S-2008
Located on MILL RUN in the Nanjemoy Creek watershed,
8-digit code: 02140110.
This stream was visited in the spring on 3/10/2008 and again in the summer on 7/22/2008.
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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Good - 4.7 / 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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6,272 acres
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An example of a forested stream.
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Urban Land Use
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2.7 %
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Agricultural Land Use
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20.4 %
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Forested Land Use
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75.4 %
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Stream Water Quality:
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| Water temperature |
24 ° C
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| Dissolved oxygen (DO) |
6.1 mg/L
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| pH (lab) |
6.26 |
| Conductivity |
68 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
58.9 µeq/L |
| Dissolved organic carbon (DOC) |
3.5443 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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| American Bullfrog |
| Northern Green Frog |
| Cambarus diogenes |
| Orconectes limosus |
| 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 |
| Hydrobaenus |
Midge
|
28 |
| Siphlonurus |
Gray Drake Mayfly
|
8 |
| Orthocladius |
Non-Biting Midges
|
7 |
| Diplocladius |
Non-Biting Midges
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6 |
| Limnephilidae |
Northern Casemaker Caddisfly
|
5 |
| Ephemerella |
Sulphur Mayfly
|
4 |
| Probezzia |
Biting Midges
|
4 |
| Isoperla |
Stripetail Stonefly
|
3 |
| Leptophlebiidae |
Pronggilled Mayfly
|
2 |
| Zavrelimyia |
Non-Biting Midges
|
2 |
| Tanytarsus |
Non-Biting Midges
|
2 |
| Stempellinella |
Non-Biting Midges
|
2 |
| Ameletus |
Combmouthed Minnow Mayfly
|
2 |
| Pilaria |
|
2 |
| Tabanidae |
Horse Fly
|
2 |
| Eurylophella |
Mayfly
|
2 |
| Chrysops |
Deerfly
|
2 |
| Ablabesmyia |
Non-Biting Midge
|
2 |
| Chironomus |
Non-Biting Midges
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1 |
| Dicrotendipes |
Non-Biting Midges
|
1 |
| Nemouridae |
Nemourid Stonefly
|
1 |
| Neoporus |
|
1 |
| Physa |
Air-Breathing Freshwater Snail
|
1 |
| Synurella |
Amphipod
|
1 |
| Naididae |
Aquatic Worm
|
1 |
| Tubificidae |
Aquatic Worm
|
1 |
| Bezzia |
Biting Midge
|
1 |
| Hexatoma |
Crane Fly
|
1 |
| Ormosia |
Cranefly
|
1 |
| Tanypodinae |
Non-Biting Midges
|
1 |
| Tanytarsini |
Non-Biting Midges
|
1 |
| Paratanytarsus |
Non-Biting Midges
|
1 |
| Phaenopsectra |
Non-Biting Midges
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1 |
| Thienemannimyia Group |
Non-Biting Midges
|
1 |
| Baetidae |
Small Minnow Mayfly
|
1 |
| Corixidae |
Water Boatman
|
1 |
| Limnodrilus |
Worm
|
1 |
| Lumbriculidae |
Worm
|
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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