MBSS Site Summary for: BRIG-105-R-2000

Site Photos

Field photo showing stream conditions at site BRIG-105-R-2000-01_0813 (Opens in a new window) Field photo showing stream conditions at site BRIG-105-R-2000-02_0814 (Opens in a new window)

Located on PATUXENT R UT1 in the Brighton Dam watershed, 8-digit code: 02131108.
This stream was visited in the spring on 3/13/2000 and again in the summer on 7/7/2000.

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

Land Use

Land use can provide important information for determining stream health.
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Catchment area 163 acres Cows standing in a stream at a site with high agricultural land use. Cows survey the sampling procedure at this extreme example of a highly agriculturalized site.
Urban Land Use 0 %
Agricultural Land Use 81.8 %
Forested Land Use 18.2 %


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

Physical Stream Habitat
Instream Habitat 11/20 (Suboptimal)
Epifaunal Substrate 13/20 (Suboptimal)
Velocity/Depth Diversity 7/20 (Marginal)
Pool Quality
Pool Extent = 12 meters 		7/20 (Marginal)
Riffle Quality
Riffle Extent = 65 meters 		11/20 (Suboptimal)
Shading 90 %
Embeddedness 20 %


Stream Water Quality:
Water temperature 16.7 ° C
Dissolved oxygen (DO) 8.3 mg/L
pH (lab) 6.88
Conductivity 100 µmho/cm
Alkalinity
(acid neutralizing capacity) 		318.9 µeq/L
Dissolved organic carbon (DOC) 0.9 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 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 153
Creek Chub 20
Biologists sampling fish communities.
Electrofishing to sample fish communities.

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

Crayfish:
No crayfish noted.

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

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ephemerella Sulphur Mayfly 30
Amphinemura Spring Stonefly 20
Eurylophella Mayfly 13
Acerpenna Tiny Blue-Winged Olive Mayflies 5
Diplectrona Net-Spinning Caddisfly 4
Ceratopogon Biting Midge 4
Prosimulium Black Fly 3
Paraleptophlebia Blue Quill Mayfly 3
Neophylax Caddisfly 3
Gomphidae Clubtail Dragonfly 3
Micropsectra Non-Biting Midges 3
Microtendipes Non-Biting Midges 2
Hexatoma Crane Fly 2
Conchapelopia Non-Biting Midges 2
Sialis Alderfly 2
Diphetor Mayfly 2
Lumbriculidae Worm 1
Naididae Aquatic Worm 1
Stenelmis Beetle 1
Orthocladiinae Midge 1
Cheumatopsyche Net-Spinning Caddisfly 1
Corynoneura Non-Biting Midges 1
Collembola Springtail 1
Tipula Crane Fly 1
Heleniella European Non-Biting Midge 1
Pycnopsyche Great Autumn Brown Sedge Caddisfly 1
Dicranota Hairy-Eyed Cranefly 1
Parametriocnemus Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Potthastia Non-Biting Midges 1
Thienemanniella Non-Biting Midges 1
Trissopelopia Non-Biting Midges 1
Tvetenia Non-Biting Midges 1
Perlodidae Perlodid Stonefly 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.