MBSS Site Summary for: PATL-109-R-2000


Located on FALLS RUN in the Patapsco River L N Br watershed, 8-digit code: 02130906.
This stream was visited in the spring on 3/7/2000 and again in the summer on 7/12/2000.

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 Good - 4.0 / 5.0
Benthic IBI Poor - 2.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 2,018 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 3.3 %
Agricultural Land Use 44.1 %
Forested Land Use 44.1 %


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 5/20 (Poor)
Velocity/Depth Diversity 7/20 (Marginal)
Pool Quality
Pool Extent = 65 meters 		7/20 (Marginal)
Riffle Quality
Riffle Extent = 25 meters 		6/20 (Marginal)
Shading 90 %
Embeddedness 60 %
The embeddedness, a measure of silt on the stream bottom, was 60%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 22.7 ° C
Dissolved oxygen (DO) 8.7 mg/L
pH (lab) 7.84
Conductivity 210 µmho/cm
Alkalinity
(acid neutralizing capacity) 		662.9 µeq/L
Dissolved organic carbon (DOC) 1.4 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
Blue Ridge Sculpin 58
Blacknose Dace 20
White Sucker 2
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog
Northern Watersnake

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Honeysuckle
Japanese Stiltgrass
Mile-A-Minute
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Sympotthastia Non-Biting Midges 77
Cricotopus/Orthocladius Midge 18
Ameletus Combmouthed Minnow Mayfly 3
Ephemerellidae Spiny Crawler Mayfly 3
Oulimnius Riffle Beetle 2
Prosimulium Black Fly 1
Amphinemura Spring Stonefly 1
Ephemerella Sulphur Mayfly 1
Hemerodromia Tiny Fly 1
Lumbriculidae Worm 1
Hexatoma Crane Fly 1
Chloroperlidae Green Stonefly 1
Eurylophella Mayfly 1
Parametriocnemus Non-Biting Midges 1
Thienemanniella Non-Biting Midges 1
Lymnaeidae Pond Snail 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.