MBSS Site Summary for: PRLN-104-R-2016

Site Photos

Field photo showing stream conditions at site PRLN-104-R-2016-MidpointDownstream (Opens in a new window) Field photo showing stream conditions at site PRLN-104-R-2016-MidpointUpstream (Opens in a new window)

Located on Dry Run in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 3/2/2016 and again in the summer on 7/7/2016.

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 N R
Benthic IBI Fair - 3.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 335 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 98 %


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

Physical Stream Habitat
Instream Habitat 5/20 (Poor)
Epifaunal Substrate 11/20 (Suboptimal)
Velocity/Depth Diversity 8/20 (Marginal)
Pool Quality
Pool Extent = 28 meters 		4/20 (Poor)
Riffle Quality
Riffle Extent = 52 meters 		7/20 (Marginal)
Shading 35 %
Embeddedness 25 %


Stream Water Quality:
pH (lab) 7.15
Alkalinity
(acid neutralizing capacity) 		167.959 µeq/L
Dissolved organic carbon (DOC) 2.3683 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:
Fish data is unavailable or no fish observed.

Amphibians and Reptiles:
Northern Green Frog
Northern Two-Lined Salamander

Crayfish:
No crayfish noted.

Exotic Plants:
Garlic Mustard
Japanese Barberry
Japanese Honeysuckle
Japanese Stiltgrass
Multiflora Rose
Tree Of Heaven
Wineberry
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ostrocerca Stonefly 25
Caecidotea Isopod 21
Nemouridae Nemourid Stonefly 13
Prosimulium Black Fly 12
Parametriocnemus Non-Biting Midges 7
Neophylax Caddisfly 5
Ephemerella Sulphur Mayfly 5
Amphinemura Spring Stonefly 5
Stegopterna Black Fly 3
Yugus 2
Leuctra  Rolled-Winged Stonefly 2
Ameletus Combmouthed Minnow Mayfly 2
Rhyacophila Free-Living Caddisfly 2
Epeorus Mayfly 2
Tvetenia Non-Biting Midges 2
Eukiefferiella Non-Biting Midges 2
Homoplectra 1
Chaetocladius Non-Biting Midges 1
Perlodidae Perlodid Stonefly 1
Capniidae Small Winter Stonefly 1
Orthocladiinae Midge 1
Diamesa Bloodworm 1
Lumbriculidae Worm 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.