MBSS Site Summary for: BA-P-262-111-96


Located on GWYNNS FALLS UT1 in the Gwynns Falls watershed, 8-digit code: 02130905.
This stream was visited in the spring on 3/11/1996 and again in the summer on 6/6/1996.

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 - 1.0 / 5.0
Benthic IBI Poor - 1.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 148 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 66.2 %
Agricultural Land Use 6.8 %
Forested Land Use 27 %


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 11/20 (Suboptimal)
Velocity/Depth Diversity 5/20 (Poor)
Pool Quality
Pool Extent = meters 		13/20 (Suboptimal)
Riffle Quality 8/20 (Marginal)
Shading 80 %
Embeddedness 80 %
The embeddedness, a measure of silt on the stream bottom, was 80%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 15.3 ° C
Dissolved oxygen (DO) 7 mg/L
pH (lab) 7.93
Conductivity 621 µmho/cm
Alkalinity
(acid neutralizing capacity) 		2334 µeq/L
Dissolved organic carbon (DOC) 3.2 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
No Fish Observed 0
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Two-Lined Salamander

Crayfish:
Orconectes virilis

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Cricotopus Non-Biting Midges 21
Thienemannimyia Non-Biting Midges 11
Simulium Black Fly 8
Paratanytarsus Non-Biting Midges 5
Cheumatopsyche Net-Spinning Caddisfly 4
Naididae Aquatic Worm 3
Crangonyx Amphipod 1
Caecidotea Isopod 1
Hydropsyche Net-Spinning Caddisfly 1
Conchapelopia Non-Biting Midges 1
Dicrotendipes Non-Biting Midges 1
Phaenopsectra Non-Biting Midges 1
Zavrelimyia 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.