MBSS Site Summary for: BRIG-132-R-2000

Site Photos

Field photo showing stream conditions at site BRIG-132-R-2000-01_0817 (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 6/26/2000.

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 - 4.7 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 216 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 61.8 %
Forested Land Use 38.2 %


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 11/20 (Suboptimal)
Velocity/Depth Diversity 7/20 (Marginal)
Pool Quality
Pool Extent = 39 meters 		9/20 (Marginal)
Riffle Quality
Riffle Extent = 36 meters 		9/20 (Marginal)
Shading 90 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 19.4 ° C
Dissolved oxygen (DO) 7.8 mg/L
pH (lab) 6.92
Conductivity 130 µmho/cm
Alkalinity
(acid neutralizing capacity) 		323.7 µeq/L
Dissolved organic carbon (DOC) 1.6 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:
The following 6 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 22
White Sucker 9
Rosyside Dace 6
Bluegill 4
Central Stoneroller 1
Largemouth Bass 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Northern Green Frog
Northern Two-Lined Salamander

Crayfish:
No crayfish noted.

Exotic Plants:
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Prosimulium Black Fly 26
Amphinemura Spring Stonefly 13
Naididae Aquatic Worm 12
Diphetor Mayfly 9
Conchapelopia Non-Biting Midges 6
Ephemerella Sulphur Mayfly 6
Neophylax Caddisfly 5
Ameletus Combmouthed Minnow Mayfly 5
Micropsectra Non-Biting Midges 4
Diplectrona Net-Spinning Caddisfly 4
Tvetenia Non-Biting Midges 3
Parametriocnemus Non-Biting Midges 3
Zavrelimyia Non-Biting Midges 2
Microtendipes Non-Biting Midges 2
Tubificidae Aquatic Worm 2
Stegopterna Black Fly 2
Paraleptophlebia Blue Quill Mayfly 2
Hexatoma Crane Fly 1
Tipula Crane Fly 1
Rhyacophila Free-Living Caddisfly 1
Ptilostomis Giant Casemaker Caddisfly 1
Gordiidae Horsehair Worm 1
Brillia Non-Biting Midges 1
Perlodidae Perlodid Stonefly 1
Cordulegaster Spiketail Dragonfly 1
Thienemanniella Non-Biting Midges 1
Prostoia Spring Stonefly 1
Acerpenna Tiny Blue-Winged Olive Mayflies 1
Leuctra  Rolled-Winged 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.