MBSS Site Summary for: NANJ-301-H-2007
Located on Nanjemoy Creek in the Nanjemoy Creek watershed,
8-digit code: 02140110.
This stream was visited in the spring on 3/28/2007 and again in the summer on 7/10/2007.
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 - 4.3 / 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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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 |
24.3 ° C
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| Dissolved oxygen (DO) |
3.8 mg/L
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Dissolved oxygen levels measured in the stream were very low (3.8 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.59 |
| Conductivity |
56 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
179.6 µeq/L |
| Dissolved organic carbon (DOC) |
10.4219 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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| Northern Green Frog |
| Northern Spring Peeper |
| Pickerel Frog |
| Orconectes limosus |
| Procambarus clarkii |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Stenonema |
Flatheaded Mayfly
|
13 |
| Sphaerium |
Fingernail Clam
|
9 |
| Gammarus |
Amphipod
|
9 |
| Simuliidae |
Black Fly
|
7 |
| Stempellinella |
Non-Biting Midges
|
7 |
| Tanytarsus |
Non-Biting Midges
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5 |
| Ablabesmyia |
Non-Biting Midge
|
4 |
| Triaenodes |
Long-Horned Caddisfly
|
4 |
| Orthocladius |
Non-Biting Midges
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4 |
| Campeloma |
|
3 |
| Ancyronyx |
Spider Riffle Beetle
|
3 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
|
3 |
| Thienemannimyia |
Non-Biting Midges
|
2 |
| Probezzia |
Biting Midges
|
2 |
| Hyalella |
Amphipod
|
2 |
| Synurella |
Amphipod
|
2 |
| Polypedilum |
Non-Biting Midges
|
2 |
| Rheocricotopus |
Non-Biting Midges
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2 |
| Rheosmittia |
Non-Biting Midges
|
2 |
| Stenacron |
Mayfly
|
2 |
| Coenagrionidae |
Narrowwinged Damselfly
|
2 |
| Cheumatopsyche |
Net-Spinning Caddisfly
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2 |
| Hydropsyche |
Net-Spinning Caddisfly
|
2 |
| Hydrobiidae |
Pebble Snail
|
2 |
| Dubiraphia |
Riffle Beetle
|
1 |
| Macronychus |
Riffle Beetle
|
1 |
| Ferrissia |
Small Air-Breathing Freshwater Limpets
|
1 |
| Dicrotendipes |
Non-Biting Midges
|
1 |
| Tanypodinae |
Non-Biting Midges
|
1 |
| Hydrobaenus |
Midge
|
1 |
| Stenelmis |
Beetle
|
1 |
| Gomphidae |
Clubtail Dragonfly
|
1 |
| Stylogomphus |
Clubtail Dragonfly
|
1 |
| Musculium |
Fingernail Clam
|
1 |
| Paralauterborniella |
|
1 |
| Ptilostomis |
Giant Casemaker Caddisfly
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1 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
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1 |
| Caecidotea |
Isopod
|
1 |
| Tribelos |
Non-Biting Midges
|
1 |
| Boyeria |
Spotted Darner Dragonfly
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1 |
| Polycentropodidae |
Trupetnet And Tubemaking Caddisfly
|
1 |
| Polycentropus |
Tube Maker Caddisfly
|
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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