MBSS Site Summary for: PRUN-106-R-2001

Site Photos

Field photo showing stream conditions at site PRUN-106-R-2001-1 (Opens in a new window) Field photo showing stream conditions at site PRUN-106-R-2001-2 (Opens in a new window)

Located on ELK LICK RUN in the Potomac River U N Branch watershed, 8-digit code: 02141005.
This stream was visited in the spring on 3/28/2001 and again in the summer on 8/15/2001.

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 1,387 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 9 %
Agricultural Land Use 8 %
Forested Land Use 83 %


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

Physical Stream Habitat
Instream Habitat 17/20 (Optimal)
Epifaunal Substrate 16/20 (Optimal)
Velocity/Depth Diversity 15/20 (Suboptimal)
Pool Quality
Pool Extent = 29 meters 		16/20 (Optimal)
Riffle Quality
Riffle Extent = 65 meters 		18/20 (Optimal)
Shading 95 %
Embeddedness 25 %
Several measures of instream habitat were considered 'Optimal' at this location.


Stream Water Quality:
Water temperature 16.5 ° C
Dissolved oxygen (DO) 8.4 mg/L
pH (lab) 4.89
Conductivity 370 µmho/cm
Alkalinity
(acid neutralizing capacity) 		-7.4 µeq/L
Dissolved organic carbon (DOC) 0.5 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 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:
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Nyctiophylax 8
Diplectrona Net-Spinning Caddisfly 7
Paraphaenocladius Non-Biting Midges 2
Molophilus 2
Orthocladiinae Midge 2
Tanytarsini Non-Biting Midges 1
Hydatophylax Northern Caddisfly 1
Leuctridae Rolledwinged Stonefly 1
Sweltsa Stonefly 1
Paraleuctra 1
Psilometriocnemus 1
Enchytraeidae Aquatic Worm 1
Ceratopogon Biting Midge 1
Rhyacophila Free-Living Caddisfly 1
Dicranota Hairy-Eyed Cranefly 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.