MBSS Site Summary for: NANJ-331-S-2012

Site Photos

Field photo showing stream conditions at site NANJ-331-S-2012-1 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2012-2 (Opens in a new window)

Located on MILL RUN in the Nanjemoy Creek watershed, 8-digit code: 02140110.
This stream was visited in the spring on 3/15/2012 and again in the summer on 6/12/2012.

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 Good - 4.0 / 5.0
Benthic IBI Good - 4.7 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 6,272 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 2.7 %
Agricultural Land Use 20.4 %
Forested Land Use 75.4 %


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

Physical Stream Habitat
Instream Habitat 15/20 (Suboptimal)
Epifaunal Substrate 16/20 (Optimal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = 69 meters 		17/20 (Optimal)
Riffle Quality
Riffle Extent = 23 meters 		8/20 (Marginal)
Shading 90 %
Embeddedness 40 %


Stream Water Quality:
pH (lab) 6.61
Alkalinity
(acid neutralizing capacity) 		114.6 µeq/L
Dissolved organic carbon (DOC) 3.088 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 13 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 11
Spottail Shiner 10
White Sucker 10
Bluegill 8
Tessellated Darter 8
Creek Chubsucker 5
American Eel 4
Creek Chub 3
Blacknose Dace 1
Green Sunfish 1
Least Brook Lamprey 1
Pumpkinseed 1
Yellow Bullhead 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Eastern American Toad
Eastern Cricket Frog
Fowler's Toad
Northern Green Frog
Northern Two-Lined Salamander

Crayfish:
Cambarus bartonii bartonii
Fallicambarus fodiens
Orconectes limosus
Procambarus clarkii

Exotic Plants:
Japanese Honeysuckle
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Isoperla Stripetail Stonefly 35
Ephemerella Sulphur Mayfly 27
Amphinemura Spring Stonefly 10
Acerpenna Tiny Blue-Winged Olive Mayflies 5
Centroptilum Small Minnow Mayfly 3
CHLOROPERLIDAE Green Stonefly 3
Triaenodes Long-Horned Caddisfly 2
Strophopteryx Early Brown Stonefly 2
Siphlonurus Gray Drake Mayfly 2
Synurella Amphipod 2
Hydrobaenus Midge 2
NEMOURIDAE Nemourid Stonefly 2
Cheumatopsyche Net-Spinning Caddisfly 2
Hydropsyche Net-Spinning Caddisfly 2
Rheotanytarsus Non-Biting Midges 2
Tribelos Non-Biting Midges 1
Trissopelopia Non-Biting Midges 1
Zavrelimyia Non-Biting Midges 1
Leptophlebia Pronggilled Mayfly 1
Oulimnius Riffle Beetle 1
Eukiefferiella Non-Biting Midges 1
Orthocladius Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Rheocricotopus Non-Biting Midges 1
Lype Net Tube Caddisfly 1
Psilotreta Mortarjoint Casemaker Caddisfly 1
Ameletus Combmouthed Minnow Mayfly 1
Zavrelia 1
Crangonyx Amphipod 1
Maccaffertium March Brown And Cahill Mayfly 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.