MBSS Site Summary for: NANJ-112-R-2000

Site Photos

Field photo showing stream conditions at site NANJ-112-R-2000-01 (Opens in a new window) Field photo showing stream conditions at site NANJ-112-R-2000-02 (Opens in a new window) Field photo showing stream conditions at site NANJ-112-R-2000-03 (Opens in a new window)

Located on HANCOCK RUN in the Nanjemoy Creek watershed, 8-digit code: 02140110.
This stream was visited in the spring on 3/8/2000 and again in the summer on 6/15/2000.

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.
Fish IBI Fair - 3.0 / 5.0
Benthic IBI Good - 4.1 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 1,318 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0.9 %
Agricultural Land Use 18.9 %
Forested Land Use 80.1 %


Stream showing woody debris, logs, and rocky substrate.
An example of woody debris in a stream.

Physical Stream Habitat
Instream Habitat 16/20 (Optimal)
Epifaunal Substrate 14/20 (Suboptimal)
Velocity/Depth Diversity 12/20 (Suboptimal)
Pool Quality
Pool Extent = 75 meters 		15/20 (Suboptimal)
Riffle Quality
Riffle Extent = 2 meters 		6/20 (Marginal)
Shading 65 %
Embeddedness 85 %
The embeddedness, a measure of silt on the stream bottom, was 85%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 19.8 ° C
Dissolved oxygen (DO) 6.7 mg/L
pH (lab) 5.47
Conductivity 50 µmho/cm
Alkalinity
(acid neutralizing capacity) 		23.4 µeq/L
Dissolved organic carbon (DOC) 4.5 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. 		Close-up of a mayfly indicator species.

Fish Survey Results:
The following 6 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 19
American Eel 10
Creek Chubsucker 4
Bluegill 2
Black Crappie 1
Chain Pickerel 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Watersnake
Pickerel Frog

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Stegopterna Black Fly 60
Leptophlebia Pronggilled Mayfly 12
Conchapelopia Non-Biting Midges 11
Prosimulium Black Fly 9
Naididae Aquatic Worm 6
Simulium Black Fly 5
Helichus Beetle 2
Corynoneura Non-Biting Midges 2
Diplocladius Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Tanytarsini Non-Biting Midges 1
Zavrelimyia Non-Biting Midges 1
Ironoquia Northern Caddisfly 1
Dytiscidae Predaceous Diving Beetle 1
Caecidotea Isopod 1
Eurylophella Mayfly 1
Hydropsyche Net-Spinning Caddisfly 1
Unniella Non-Biting Midge 1
Amphinemura Spring Stonefly 1
Kick net sampling for macroinvertebrates.
Sampling with a kick net.

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.