MBSS Site Summary for: AL-A-187-218-96


Located on DEEP HOLLOW in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 4/24/1996 and again in the summer on 7/10/1996.

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 - 2.0 / 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 917 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0 %
Agricultural Land Use 0.4 %
Forested Land Use 99.1 %


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

Physical Stream Habitat
Instream Habitat 9/20 (Marginal)
Epifaunal Substrate 5/20 (Poor)
Velocity/Depth Diversity 11/20 (Suboptimal)
Pool Quality
Pool Extent = meters 		16/20 (Optimal)
Riffle Quality 7/20 (Marginal)
Shading 93 %
Embeddedness 25 %


Stream Water Quality:
Water temperature 17 ° C
Dissolved oxygen (DO) 7.5 mg/L
pH (lab) 7.33
Conductivity 103 µmho/cm
Alkalinity
(acid neutralizing capacity) 		391.6 µeq/L
Dissolved organic carbon (DOC) 2 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 85
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
Seal Salamander

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Prosimulium Black Fly 44
Epeorus Mayfly 17
Amphinemura Spring Stonefly 17
Diplectrona Net-Spinning Caddisfly 6
Tanytarsus Non-Biting Midges 6
Paraleptophlebia Blue Quill Mayfly 3
Cinygmula Dark Red Quill Mayfly 2
Rhyacophila Free-Living Caddisfly 2
Baetidae Small Minnow Mayfly 2
Parametriocnemus Non-Biting Midges 2
Ephemerella Sulphur Mayfly 2
Gammarus Amphipod 1
Ostrocerca Stonefly 1
Polypedilum Non-Biting Midges 1
Diamesa Bloodworm 1
Pteronarcys Giant Stonefly 1
Chloroperlidae Green Stonefly 1
Neophylax Caddisfly 1
Lanthus Clubtail Dragonfly 1
Ameletus Combmouthed Minnow Mayfly 1
Perlidae Common Stonefly 1
Tipula Crane 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.