MBSS Site Summary for: PRLN-105-R-2003

Site Photos

Field photo showing stream conditions at site PRLN-105-R-2003-1 (Opens in a new window) Field photo showing stream conditions at site PRLN-105-R-2003-2 (Opens in a new window)

Located on TRADING RUN in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 3/25/2003 and again in the summer on 6/12/2003.

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 - 1.8 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 165 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 0 %
Agricultural Land Use 0 %
Forested Land Use 100 %


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

Physical Stream Habitat
Instream Habitat 7/20 (Marginal)
Epifaunal Substrate 15/20 (Suboptimal)
Velocity/Depth Diversity 6/20 (Marginal)
Pool Quality
Pool Extent = 16 meters 		6/20 (Marginal)
Riffle Quality
Riffle Extent = 40 meters 		10/20 (Marginal)
Shading 97 %
Embeddedness 40 %


Stream Water Quality:
Water temperature 13.7 ° C
Dissolved oxygen (DO) 7.1 mg/L
pH (lab) 5.4
Conductivity 42 µmho/cm
Alkalinity
(acid neutralizing capacity) 		11 µeq/L
Dissolved organic carbon (DOC) 2.8 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 1 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
No Fish Observed 0
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
No amphibians and reptiles noted.

Crayfish:
No crayfish noted.

Exotic Plants:
Canada Thistle
Mile-A-Minute
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ostrocerca Stonefly 56
Stegopterna Black Fly 29
Caecidotea Isopod 15
Eukiefferiella Non-Biting Midges 9
Parametriocnemus Non-Biting Midges 6
Rheocricotopus Non-Biting Midges 6
Tanytarsini Non-Biting Midges 4
Ameletus Combmouthed Minnow Mayfly 3
Chaetocladius Non-Biting Midges 2
Corynoneura Non-Biting Midges 1
Capniidae Small Winter Stonefly 1
Pseudorthocladius Non-Biting Midges 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.