MBSS Site Summary for: PG-S-007-108-97


Located on SUMMERVILLE CR UT1 in the Patuxent River lower watershed, 8-digit code: 02131101.
This stream was visited in the spring on 3/11/1997 and again in the summer on 6/3/1997.

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 - 1.0 / 5.0
Benthic IBI Poor - 2.1 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 20 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 0 %
Agricultural Land Use 0 %
Forested Land Use 99.9 %


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

Physical Stream Habitat
Instream Habitat 3/20 (Poor)
Epifaunal Substrate 12/20 (Suboptimal)
Velocity/Depth Diversity 7/20 (Marginal)
Pool Quality
Pool Extent = meters 		9/20 (Marginal)
Riffle Quality 4/20 (Poor)
Shading 82 %
Embeddedness 67 %
The embeddedness, a measure of silt on the stream bottom, was 67%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 13 ° C
Dissolved oxygen (DO) 8.7 mg/L
pH (lab) 5.19
Conductivity 38 µmho/cm
Alkalinity
(acid neutralizing capacity) 		9.5 µeq/L
Dissolved organic carbon (DOC) 2.3 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
Eastern Mudminnow 4
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Eastern Mud Salamander
Fowler's Toad
Northern Green Frog
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
Heterotrissocladius European Non-Biting Midge 22
Thienemannimyia Non-Biting Midges 16
Stegopterna Black Fly 16
Crangonyx Amphipod 10
Caecidotea Isopod 7
Procladius Non-Biting Midge 4
Pseudolimnophila Crane Fly 3
Bittacomorpha 1
Lepidostoma Little Brown Sedge Caddisfly 1
Polycentropus Tube Maker Caddisfly 1
Limnodrilus Worm 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.