MBSS Site Summary for: PRLT-108-R-2002

Site Photos

Field photo showing stream conditions at site PRLT-108-R-2002-420 (Opens in a new window) Field photo showing stream conditions at site PRLT-108-R-2002-421 (Opens in a new window)

Located on DITCHLEY PRONGE in the Potomac River L tidal watershed, 8-digit code: 02140101.
This stream was visited in the spring on 3/18/2002 and again in the summer on 7/3/2002.

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 N R
Benthic IBI Fair - 3.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 1,374 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 5 %
Agricultural Land Use 29 %
Forested Land Use 66 %


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

Physical Stream Habitat
Instream Habitat not sampled
Epifaunal Substrate not sampled
Velocity/Depth Diversity not sampled
Pool Quality not sampled
Riffle Quality not sampled
Shading not sampled
Embeddedness not sampled


Stream Water Quality:
pH (lab) 6.56
Alkalinity
(acid neutralizing capacity) 		278.1 µeq/L
Dissolved organic carbon (DOC) 7.6 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:
Fish data is unavailable or no fish observed.

Amphibians and Reptiles:
Northern Watersnake

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Stegopterna Black Fly 19
Micropsectra Non-Biting Midges 13
Prosimulium Black Fly 11
Conchapelopia Non-Biting Midges 10
Caecidotea Isopod 5
Tubificidae Aquatic Worm 5
Parametriocnemus Non-Biting Midges 5
Pisidiidae Pill Clam 5
Ostrocerca Stonefly 4
Lumbriculidae Worm 4
Orthocladiinae Midge 3
Tanypodinae Non-Biting Midges 3
Tanytarsus Non-Biting Midges 3
Trissopelopia Non-Biting Midges 3
Ironoquia Northern Caddisfly 2
Synurella Amphipod 2
Polypedilum Non-Biting Midges 2
Amphinemura Spring Stonefly 1
Lepidoptera Aquatic Moth 1
Probezzia Biting Midges 1
Cheumatopsyche Net-Spinning Caddisfly 1
Erioptera Cranefly 1
Heterotrissocladius European Non-Biting Midge 1
Orthocladius 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.