MBSS Site Summary for: AL-A-268-221-96


Located on SEVEN SPRINGS RUN in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 4/4/1996 and again in the summer on 6/19/1996.

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 Poor - 1.0 / 5.0
Benthic IBI Poor - 2.5 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 309 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0 %
Agricultural Land Use 6.8 %
Forested Land Use 92.6 %


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

Physical Stream Habitat
Instream Habitat 9/20 (Marginal)
Epifaunal Substrate 15/20 (Suboptimal)
Velocity/Depth Diversity 8/20 (Marginal)
Pool Quality
Pool Extent = meters 		8/20 (Marginal)
Riffle Quality 7/20 (Marginal)
Shading 95 %
Embeddedness 0 %


Stream Water Quality:
Water temperature 18 ° C
Dissolved oxygen (DO) 6 mg/L
pH (lab) 7.24
Conductivity 150 µmho/cm
Alkalinity
(acid neutralizing capacity) 		475.2 µeq/L
Dissolved organic carbon (DOC) 3.3 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 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 11
Creek Chub 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Dusky Salamander
Northern Two-Lined Salamander

Crayfish:
Cambarus bartonii bartonii

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ameletus Combmouthed Minnow Mayfly 33
Ostrocerca Stonefly 15
Perlodidae Perlodid Stonefly 11
Amphinemura Spring Stonefly 8
Stegopterna Black Fly 7
Leuctra  Rolled-Winged Stonefly 7
Parametriocnemus Non-Biting Midges 6
Prosimulium Black Fly 3
Hexatoma Crane Fly 2
Wormaldia Fingernet Caddisfly 2
Pseudolimnophila Crane Fly 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.