MBSS Site Summary for: PRLN-626-S-2000

Site Photos

Field photo showing stream conditions at site PRLN-626-S-2000-01 (Opens in a new window) Field photo showing stream conditions at site PRLN-626-S-2000-02 (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 4/11/2000 and again in the summer on 6/1/2000.

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 - 5.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 477 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 17/20 (Optimal)
Epifaunal Substrate 17/20 (Optimal)
Velocity/Depth Diversity 16/20 (Optimal)
Pool Quality
Pool Extent = 25 meters 		16/20 (Optimal)
Riffle Quality
Riffle Extent = 65 meters 		17/20 (Optimal)
Shading 90 %
Embeddedness 0 %
Several measures of instream habitat were considered 'Optimal' at this location.


Stream Water Quality:
Water temperature 19.8 ° C
Dissolved oxygen (DO) 6.8 mg/L
pH (lab) 7.56
Conductivity 110 µmho/cm
Alkalinity
(acid neutralizing capacity) 		544.9 µeq/L
Dissolved organic carbon (DOC) 1 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 100
Blue Ridge Sculpin 54
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
No amphibians and reptiles noted.

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Paraleptophlebia Blue Quill Mayfly 16
Baetidae Small Minnow Mayfly 16
Amphinemura Spring Stonefly 13
Cinygmula Dark Red Quill Mayfly 13
Micropsectra Non-Biting Midges 10
Epeorus Mayfly 7
Diplectrona Net-Spinning Caddisfly 7
Isoperla Stripetail Stonefly 6
Pteronarcys Giant Stonefly 5
Prosimulium Black Fly 4
Ephemerella Sulphur Mayfly 3
Diamesa Bloodworm 3
Leuctridae Rolledwinged Stonefly 2
Baetis Blue-Winged Olive Mayfly 2
Perlidae Common Stonefly 1
Pseudolimnophila Crane Fly 1
Chloroperlidae Green Stonefly 1
Dicranota Hairy-Eyed Cranefly 1
Simulium Black Fly 1
Leucrocuta Mayfly 1
Dolophilodes Medium Evening Sedge Caddisfly 1
Trissopelopia Non-Biting Midges 1
Oulimnius Riffle Beetle 1
Promoresia Riffle Beetle 1
Ectopria Water Penny Beetle 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.