MBSS Site Summary for: AA-S-008-132-97


Located on HALL CR in the Patuxent River lower watershed, 8-digit code: 02131101.
This stream was visited in the spring on 3/6/1997 and again in the summer on 6/30/1997.

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 - 2.3 / 5.0
Benthic IBI Fair - 3.6 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 443 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 5 %
Agricultural Land Use 36.5 %
Forested Land Use 58.5 %


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

Physical Stream Habitat
Instream Habitat 4/20 (Poor)
Epifaunal Substrate 4/20 (Poor)
Velocity/Depth Diversity 7/20 (Marginal)
Pool Quality
Pool Extent = meters 		8/20 (Marginal)
Riffle Quality 9/20 (Marginal)
Shading 80 %
Embeddedness 100 %
The embeddedness, a measure of silt on the stream bottom, was 100%. This is very high, and may adversely affect biotic communities.


Stream Water Quality:
Water temperature 18.3 ° C
Dissolved oxygen (DO) 8.5 mg/L
pH (lab) 6.88
Conductivity 150 µmho/cm
Alkalinity
(acid neutralizing capacity) 		430.3 µeq/L
Dissolved organic carbon (DOC) 2.9 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 3 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 148
Blacknose Dace 20
Tessellated Darter 4
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog
Northern Two-Lined Salamander
Pickerel Frog

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Amphipoda Scud 32
Gammarus Amphipod 25
Prostoia Spring Stonefly 6
Amphinemura Spring Stonefly 4
Limnephilidae Northern Casemaker Caddisfly 4
Cricotopus/Orthocladius Midge 4
Stegopterna Black Fly 4
Conchapelopia Non-Biting Midges 2
Micropsectra Non-Biting Midges 2
Parametriocnemus Non-Biting Midges 2
Tubificidae Aquatic Worm 2
Helichus Beetle 2
Hyalella Amphipod 1
Hydrobaenus Midge 1
Lype Net Tube Caddisfly 1
Brillia Non-Biting Midges 1
Rheocricotopus Non-Biting Midges 1
Hydatophylax Northern Caddisfly 1
Corynoneura Non-Biting Midges 1
Ptilostomis Giant Casemaker Caddisfly 1
Dytiscidae Predaceous Diving Beetle 1
Crangonyx Amphipod 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.