MBSS Site Summary for: PRLN-626-S-2008

Site Photos

Field photo showing stream conditions at site PRLN-626-S-2008-1 (Opens in a new window) Field photo showing stream conditions at site PRLN-626-S-2008-2 (Opens in a new window)

Located on MILL RUN in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 4/1/2008 and again in the summer on 6/30/2008.

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 - 4.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 470 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0.5 %
Agricultural Land Use 2 %
Forested Land Use 63.6 %


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

Physical Stream Habitat
Instream Habitat 18/20 (Optimal)
Epifaunal Substrate 19/20 (Optimal)
Velocity/Depth Diversity 10/20 (Marginal)
Pool Quality
Pool Extent = 25 meters 		10/20 (Marginal)
Riffle Quality
Riffle Extent = 59 meters 		13/20 (Suboptimal)
Shading 90 %
Embeddedness 0 %


Stream Water Quality:
Water temperature 17.7 ° C
Dissolved oxygen (DO) 7.4 mg/L
pH (lab) 7.76
Conductivity 157 µmho/cm
Alkalinity
(acid neutralizing capacity) 		691.2 µeq/L
Dissolved organic carbon (DOC) 0.9603 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 68
Blue Ridge Sculpin 20
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Dusky Salamander
Northern Green Frog
Northern Spring Peeper
Seal Salamander

Crayfish:
Cambarus bartonii bartonii

Exotic Plants:
Garlic Mustard
Japanese Stiltgrass
Wineberry
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Amphinemura Spring Stonefly 16
Diphetor Mayfly 11
Paraleptophlebia Blue Quill Mayfly 10
Prosimulium Black Fly 9
Parametriocnemus Non-Biting Midges 7
Leptophlebiidae Pronggilled Mayfly 7
Leuctridae Rolledwinged Stonefly 7
Stempellinella Non-Biting Midges 6
Ephemerella Sulphur Mayfly 4
Diplectrona Net-Spinning Caddisfly 4
Eukiefferiella Non-Biting Midges 3
Epeorus Mayfly 3
Cinygmula Dark Red Quill Mayfly 3
Pteronarcys Giant Stonefly 3
Chloroperlidae Green Stonefly 2
Perlidae Common Stonefly 2
Tanytarsus Non-Biting Midges 2
Tvetenia Non-Biting Midges 2
Isoperla Stripetail Stonefly 2
Habrophlebia Prong-Gilled Mayfly 1
Limnephilidae Northern Casemaker Caddisfly 1
Perlodidae Perlodid Stonefly 1
Polycentropodidae Trupetnet And Tubemaking Caddisfly 1
Ectopria Water Penny Beetle 1
Eurylophella Mayfly 1
Polypedilum Non-Biting Midges 1
Dicranota Hairy-Eyed Cranefly 1
Drunella Blue-Winged Olive Mayfly 1
Gomphidae Clubtail Dragonfly 1
Ameletus Combmouthed Minnow 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.