MBSS Site Summary for: PRAL-107-R-2001

Site Photos

Field photo showing stream conditions at site PRAL-107-R-2001-1 (Opens in a new window) Field photo showing stream conditions at site PRAL-107-R-2001-2 (Opens in a new window)

Located on TWIGG HOLLOW in the Potomac River AL Cnty watershed, 8-digit code: 02140508.
This stream was visited in the spring on 3/27/2001 and again in the summer on 6/27/2001.

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 Poor - 1.0 / 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 719 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 9 %
Agricultural Land Use 0 %
Forested Land Use 91 %


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 14/20 (Suboptimal)
Velocity/Depth Diversity 7/20 (Marginal)
Pool Quality
Pool Extent = 50 meters 		12/20 (Suboptimal)
Riffle Quality
Riffle Extent = 25 meters 		6/20 (Marginal)
Shading 92 %
Embeddedness 15 %


Stream Water Quality:
Water temperature 16.5 ° C
Dissolved oxygen (DO) 8.7 mg/L
pH (lab) 7.08
Conductivity 90 µmho/cm
Alkalinity
(acid neutralizing capacity) 		132.3 µeq/L
Dissolved organic carbon (DOC) 1.6 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 1 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 26
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
Red-Spotted Newt

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Prosimulium Black Fly 28
Ephemerella Sulphur Mayfly 18
Epeorus Mayfly 11
Leuctridae Rolledwinged Stonefly 11
Amphinemura Spring Stonefly 8
Sweltsa Stonefly 5
Crangonyx Amphipod 4
Neophylax Caddisfly 3
Parametriocnemus Non-Biting Midges 3
Tanytarsus Non-Biting Midges 3
Micropsectra Non-Biting Midges 2
Ameletus Combmouthed Minnow Mayfly 2
Lumbriculidae Worm 2
Perlodidae Perlodid Stonefly 2
Pycnopsyche Great Autumn Brown Sedge Caddisfly 1
Caecidotea Isopod 1
Lepidostoma Little Brown Sedge Caddisfly 1
Probezzia Biting Midges 1
Stegopterna Black Fly 1
Paraleptophlebia Blue Quill Mayfly 1
Leuctra  Rolled-Winged Stonefly 1
Stenacron Mayfly 1
Cricotopus/Orthocladius Midge 1
Thienemannimyia group Non-Biting Midges 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.