MBSS Site Summary for: NANJ-301-H-2009
Located on Nanjemoy Creek in the Nanjemoy Creek watershed,
8-digit code: 02140110.
This stream was visited in the spring on 3/9/2009 and again in the summer on 8/13/2009.
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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Fair - 3.3 / 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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10,417 acres
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An example of a forested stream.
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Urban Land Use
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2.2 %
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Agricultural Land Use
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13.5 %
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Forested Land Use
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82.1 %
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Stream Water Quality:
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| Water temperature |
22.8 ° C
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| Dissolved oxygen (DO) |
4.6 mg/L
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Dissolved oxygen levels measured in the stream were very low (4.6 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.36 |
| Conductivity |
56 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
125.9 µeq/L |
| Dissolved organic carbon (DOC) |
6.555 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 |
| Eastern Box Turtle |
| Eastern Cricket Frog |
| Northern Green Frog |
| Upland Chorus Frog |
| Wood Frog |
| Cambaridae |
| Orconectes limosus |
| Procambarus clarkii |
| Japanese Stiltgrass |
| Mile-A-Minute |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Leptophlebia |
Pronggilled Mayfly
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27 |
| Leptophlebiidae |
Pronggilled Mayfly
|
23 |
| Gammarus |
Amphipod
|
10 |
| Caecidotea |
Isopod
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9 |
| Maccaffertium |
March Brown And Cahill Mayfly
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7 |
| Eurylophella |
Mayfly
|
5 |
| Zavrelimyia |
Non-Biting Midges
|
5 |
| Phaenopsectra |
Non-Biting Midges
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3 |
| Musculium |
Fingernail Clam
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3 |
| Oecetis |
Long-Horned Caddisfly
|
2 |
| Gomphus |
Clubtail Dragonfly
|
2 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
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2 |
| Polycentropus |
Tube Maker Caddisfly
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2 |
| Stempellinella |
Non-Biting Midges
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1 |
| Thienemannimyia Group |
Non-Biting Midges
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1 |
| Ceraclea |
Scaly-Winged Sedge Caddisfly
|
1 |
| Capniidae |
Small Winter Stonefly
|
1 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
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1 |
| Ephemeridae |
Common Burrower Mayfly
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1 |
| Synurella |
Amphipod
|
1 |
| Prosimulium |
Black Fly
|
1 |
| Anisocentropus |
|
1 |
| Campeloma |
|
1 |
| Perlinella |
|
1 |
| Physa |
Air-Breathing Freshwater Snail
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1 |
| Sialis |
Alderfly
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1 |
| Crangonyx |
Amphipod
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1 |
| Ptilostomis |
Giant Casemaker Caddisfly
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1 |
| Corynoneura |
Non-Biting Midges
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1 |
| Microtendipes |
Non-Biting Midges
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1 |
| Orthocladius |
Non-Biting Midges
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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.
