MBSS Site Summary for: PRLN-306-R-2003

Site Photos

Field photo showing stream conditions at site PRLN-306-R-2003-1 (Opens in a new window) Field photo showing stream conditions at site PRLN-306-R-2003-3 (Opens in a new window) Field photo showing stream conditions at site PRLN-306-R-2003-4 (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 3/27/2003 and again in the summer on 7/7/2003.

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 - 3.7 / 5.0
Benthic IBI Good - 4.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
(Hint: Screen readers will announce definitions; mouse users can hover over dotted text.)
Catchment area 5,698 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 4 %
Agricultural Land Use 10 %
Forested Land Use 85 %


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

Physical Stream Habitat
Instream Habitat 12/20 (Suboptimal)
Epifaunal Substrate 13/20 (Suboptimal)
Velocity/Depth Diversity 10/20 (Marginal)
Pool Quality
Pool Extent = 38 meters 		9/20 (Marginal)
Riffle Quality
Riffle Extent = 45 meters 		13/20 (Suboptimal)
Shading 94 %
Embeddedness 25 %


Stream Water Quality:
Water temperature 18.6 ° C
Dissolved oxygen (DO) 8.7 mg/L
pH (lab) 7.35
Conductivity 127 µmho/cm
Alkalinity
(acid neutralizing capacity) 		226.5 µeq/L
Dissolved organic carbon (DOC) 1.9 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 5 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 226
Potomac Sculpin 113
Creek Chub 39
Fantail Darter 10
White Sucker 3
Biologists sampling fish communities.
Electrofishing to sample fish communities.

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

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Stiltgrass
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Hexatoma Crane Fly 13
Amphinemura Spring Stonefly 11
Prostoia Spring Stonefly 10
Paraleptophlebia Blue Quill Mayfly 10
Oemopteryx Stonefly 9
Micropsectra Non-Biting Midges 8
Ephemerellidae Spiny Crawler Mayfly 8
Pseudolimnophila Crane Fly 5
Diamesa Bloodworm 4
Optioservus Riffle Beetle 4
Leuctridae Rolledwinged Stonefly 3
Baetidae Small Minnow Mayfly 3
Eukiefferiella Non-Biting Midges 3
Ceratopogon Biting Midge 3
Ameletus Combmouthed Minnow Mayfly 2
Antocha Crane Fly 2
Acroneuria Golden Stoneflies 2
Tanytarsus Non-Biting Midges 2
Perlodidae Perlodid Stonefly 2
Polypedilum Non-Biting Midges 1
Sympotthastia Non-Biting Midges 1
Polycentropus Tube Maker Caddisfly 1
Lumbriculidae Worm 1
Lepidostoma Little Brown Sedge Caddisfly 1
Epeorus Mayfly 1
Nemouridae Nemourid Stonefly 1
Diplectrona Net-Spinning Caddisfly 1
Prosimulium Black Fly 1
Stegopterna Black Fly 1
Neophylax Caddisfly 1
Philopotamidae Fingernet Caddisfly 1
Heptageniidae Flathead 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.