MBSS Site Summary for: PRUN-207-B-2010

Site Photos

Field photo showing stream conditions at site PRUN-207-B-2010-1 (Opens in a new window) Field photo showing stream conditions at site PRUN-207-B-2010-2 (Opens in a new window)

Located on Shields Run in the Potomac River U N Branch watershed, 8-digit code: 02141005.
This stream was visited in the spring on 4/28/2010 and again in the summer on 6/23/2010.

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 Fair - 3.5 / 5.0
Benthic IBI Good - 4.5 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 3,353 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 4.6 %
Agricultural Land Use 18.8 %
Forested Land Use 73.8 %


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

Physical Stream Habitat
Instream Habitat 13/20 (Suboptimal)
Epifaunal Substrate 13/20 (Suboptimal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = 66 meters 		15/20 (Suboptimal)
Riffle Quality
Riffle Extent = 47 meters 		14/20 (Suboptimal)
Shading 55 %
Embeddedness 45 %


Stream Water Quality:
pH (lab) 7.835
Alkalinity
(acid neutralizing capacity) 		968.6 µeq/L
Dissolved organic carbon (DOC) 0.7603 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 3 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 98
White Sucker 63
Creek Chub 47
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Slimy Salamander

Crayfish:
Cambarus
Cambarus bartonii bartonii

Exotic Plants:
No Exotic Plants Observed
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Leuctra  Rolled-Winged Stonefly 28
Ephemerella Sulphur Mayfly 16
Leuctridae Rolledwinged Stonefly 10
Amphinemura Spring Stonefly 6
Diphetor Mayfly 5
Epeorus Mayfly 5
Diamesa Bloodworm 4
Oulimnius Riffle Beetle 4
Optioservus Riffle Beetle 3
Ameletus Combmouthed Minnow Mayfly 3
Orthocladius Non-Biting Midges 3
Pycnopsyche Great Autumn Brown Sedge Caddisfly 2
Maccaffertium March Brown And Cahill Mayfly 2
Leptophlebiidae Pronggilled Mayfly 2
Isoperla Stripetail Stonefly 1
Diploperla 1
Haploperla Green Stonefly 1
Lepidostoma Little Brown Sedge Caddisfly 1
Tvetenia Non-Biting Midges 1
Philopotamidae Fingernet Caddisfly 1
Rhyacophila Free-Living Caddisfly 1
Paraleptophlebia Blue Quill Mayfly 1
Fossaria Air Breathing Freshwater Snail 1
Tubificidae Aquatic Worm 1
Helichus Beetle 1
Prosimulium Black 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.