MBSS Site Summary for: PRLT-105-R-2002

Site Photos

Field photo showing stream conditions at site PRLT-105-R-2002-428 (Opens in a new window) Field photo showing stream conditions at site PRLT-105-R-2002-429 (Opens in a new window) Field photo showing stream conditions at site PRLT-105-R-2002-565 (Opens in a new window) Field photo showing stream conditions at site PRLT-105-R-2002-566 (Opens in a new window)

Located on POPLAR HILL CR in the Potomac River L tidal watershed, 8-digit code: 02140101.
This stream was visited in the spring on 3/19/2002 and again in the summer on 6/25/2002.

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 Poor - 1.7 / 5.0
Benthic IBI Good - 4.1 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 112 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 4 %
Agricultural Land Use 13 %
Forested Land Use 83 %


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 2/20 (Poor)
Pool Quality
Pool Extent = 39 meters 		7/20 (Marginal)
Riffle Quality
Riffle Extent = 0 meters 		0/20 (Poor)
Shading 90 %
Embeddedness 100 %
The embeddedness, a measure of silt on the stream bottom, was 100%. This is very high, and may adversely affect biotic communities.
Several measures of instream habitat were considered 'Poor' at this location.


Stream Water Quality:
Water temperature 19.5 ° C
Dissolved oxygen (DO) 0.6 mg/L
Dissolved oxygen levels measured in the stream were very low (0.6 mg/L). Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
pH (lab) 5.18
Conductivity 60 µmho/cm
Alkalinity
(acid neutralizing capacity) 		7 µeq/L
Dissolved organic carbon (DOC) 2.1 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 138
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Eastern Ratsnake
Northern Green Frog

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Stiltgrass
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Diplectrona Net-Spinning Caddisfly 41
Leuctra  Rolled-Winged Stonefly 24
Synurella Amphipod 10
Conchapelopia Non-Biting Midges 6
Polycentropus Tube Maker Caddisfly 5
Pseudolimnophila Crane Fly 3
Nigronia Megaloptera (Dark Fishfly) 2
Heterotrissocladius European Non-Biting Midge 2
Philopotamidae Fingernet Caddisfly 1
Caecidotea Isopod 1
Eurylophella Mayfly 1
Chrysops Deerfly 1
Isotomurus Elongate-Bodied Springtail 1
Sialis Alderfly 1
Stegopterna Black Fly 1
Gomphidae Clubtail Dragonfly 1
Hexatoma Crane Fly 1
Microtendipes Non-Biting Midges 1
Thienemanniella Non-Biting Midges 1
Trissopelopia Non-Biting Midges 1
Zavrelimyia Non-Biting Midges 1
Limnephilidae Northern Casemaker Caddisfly 1
Oulimnius Riffle Beetle 1
Cordulegaster Spiketail Dragonfly 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.