MBSS Site Summary for: MO-P-269-203-97


Located on SLIGO CR in the Anacostia River watershed, 8-digit code: 02140205.
This stream was visited in the spring on 3/24/1997 and again in the summer on 6/18/1997.

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 - 1.3 / 5.0
Benthic IBI Poor - 1.7 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 3,398 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 65.6 %
Agricultural Land Use 4.7 %
Forested Land Use 29.5 %


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

Physical Stream Habitat
Instream Habitat 15/20 (Suboptimal)
Epifaunal Substrate 11/20 (Suboptimal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = meters 		16/20 (Optimal)
Riffle Quality 14/20 (Suboptimal)
Shading 70 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 18.8 ° C
Dissolved oxygen (DO) 7.5 mg/L
pH (lab) 8.22
Conductivity 349 µmho/cm
Alkalinity
(acid neutralizing capacity) 		1381 µeq/L
Dissolved organic carbon (DOC) 2.5 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 367
Creek Chub 35
White Sucker 32
Green Sunfish 15
Longnose Dace 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
No amphibians and reptiles noted.

Crayfish:
Orconectes virilis

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Naididae Aquatic Worm 58
Cricotopus/Orthocladius Midge 3
Eukiefferiella Non-Biting Midges 3
Lumbriculidae Worm 3
Polypedilum Non-Biting Midges 2
Crangonyx Amphipod 2
Enchytraeidae Aquatic Worm 2
Ormosia Cranefly 1
Orthocladiinae A Non-Biting Midges 1
Cheumatopsyche Net-Spinning Caddisfly 1
Rheocricotopus Non-Biting Midges 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.