MBSS Site Summary for: AA-N-104-114-95


Located on MARLEY CR UT1 in the Baltimore Harbor watershed, 8-digit code: 02130903.
This stream was visited in the spring on 3/23/1995 and again in the summer on 7/5/1995.

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 - 2.3 / 5.0
Benthic IBI Poor - 2.4 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 310 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 67 %
Agricultural Land Use 9.8 %
Forested Land Use 1.8 %


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

Physical Stream Habitat
Instream Habitat 6/20 (Marginal)
Epifaunal Substrate 4/20 (Poor)
Velocity/Depth Diversity 6/20 (Marginal)
Pool Quality
Pool Extent = meters 		11/20 (Suboptimal)
Riffle Quality 8/20 (Marginal)
Shading 55 %
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 23.1 ° C
Dissolved oxygen (DO) 5.4 mg/L
pH (lab) 6.9
Conductivity 326 µmho/cm
Alkalinity
(acid neutralizing capacity) 		1039 µeq/L
Dissolved organic carbon (DOC) 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 4 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 47
Common Carp 3
Blacknose Dace 1
Tessellated Darter 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog

Crayfish:
Cambaridae

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Cricotopus/Orthocladius Midge 12
Pisidium Freshwater Pea (Pill) Clam 9
Polypedilum Non-Biting Midges 8
Thienemannimyia Non-Biting Midges 8
Tubificidae Aquatic Worm 4
Cryptochironomus Non-Biting Midges 4
Nanocladius Non-Biting Midges 2
Physa Air-Breathing Freshwater Snail 2
Larsia Non-Biting Midge 2
Tribelos Non-Biting Midges 1
Lumbriculidae Worm 1
Menetus Air Breathing Freshwater Snail 1
Xylotopus Midge 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.