MBSS Site Summary for: PRLN-305-R-2007

Site Photos

Field photo showing stream conditions at site PRLN-305-R-2007-1 (Opens in a new window) Field photo showing stream conditions at site PRLN-305-R-2007-2 (Opens in a new window)

Located on Collier Run in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 4/17/2007 and again in the summer on 6/8/2007.

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 - 3.0 / 5.0
Benthic IBI Good - 4.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 3,800 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 3.8 %
Agricultural Land Use 10.4 %
Forested Land Use 85.8 %


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 12/20 (Suboptimal)
Velocity/Depth Diversity 9/20 (Marginal)
Pool Quality
Pool Extent = 49 meters 		10/20 (Marginal)
Riffle Quality
Riffle Extent = 44 meters 		11/20 (Suboptimal)
Shading 96 %
Embeddedness 15 %


Stream Water Quality:
Water temperature 21.5 ° C
Dissolved oxygen (DO) 6.3 mg/L
pH (lab) 6.89
Conductivity 118 µmho/cm
Alkalinity
(acid neutralizing capacity) 		150 µeq/L
Dissolved organic carbon (DOC) 3.5318 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 6 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 197
Creek Chub 62
Green Sunfish 17
White Sucker 14
Fantail Darter 10
Potomac Sculpin 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Northern Dusky Salamander
Northern Green Frog
Northern Red Salamander

Crayfish:
Cambarus bartonii bartonii

Exotic Plants:
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ephemerella Sulphur Mayfly 18
Leuctra  Rolled-Winged Stonefly 11
Prosimulium Black Fly 10
Isoperla Stripetail Stonefly 8
Amphinemura Spring Stonefly 6
Micropsectra Non-Biting Midges 6
Eukiefferiella Non-Biting Midges 5
Thienemannimyia group Non-Biting Midges 5
Leptophlebiidae Pronggilled Mayfly 5
Polypedilum Non-Biting Midges 3
Ephemerellidae Spiny Crawler Mayfly 3
Stenelmis Beetle 3
Ameletus Combmouthed Minnow Mayfly 3
Diamesa Bloodworm 2
Neophylax Caddisfly 2
Nigronia Megaloptera (Dark Fishfly) 2
Hydrobaenus Midge 1
Psilotreta Mortarjoint Casemaker Caddisfly 1
Dicrotendipes Non-Biting Midges 1
Orthocladius Non-Biting Midges 1
Parametriocnemus Non-Biting Midges 1
Helichus Beetle 1
Hexatoma Crane Fly 1
Heptageniidae Flathead Mayfly 1
Acroneuria Golden Stoneflies 1
Chloroperlidae Green Stonefly 1
Optioservus Riffle Beetle 1
Baetidae Small 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.