MBSS Site Summary for: RKGR-119-S-2000

Site Photos

Field photo showing stream conditions at site RKGR-119-S-2000-01 (Opens in a new window) Field photo showing stream conditions at site RKGR-119-S-2000-02 (Opens in a new window)

Located on PATUXENT R UT2 in the Rocky Gorge Dam watershed, 8-digit code: 02131107.
This stream was visited in the spring on 3/24/2000 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 Good - 4.0 / 5.0
Benthic IBI Good - 4.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 686 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0.4 %
Agricultural Land Use 32.7 %
Forested Land Use 66.8 %


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

Physical Stream Habitat
Instream Habitat 16/20 (Optimal)
Epifaunal Substrate 17/20 (Optimal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = 9 meters 		12/20 (Suboptimal)
Riffle Quality
Riffle Extent = 66 meters 		16/20 (Optimal)
Shading 90 %
Embeddedness 35 %
Several measures of instream habitat were considered 'Optimal' at this location.


Stream Water Quality:
Water temperature 20.3 ° C
Dissolved oxygen (DO) 8.2 mg/L
pH (lab) 7.49
Conductivity 170 µmho/cm
Alkalinity
(acid neutralizing capacity) 		867.3 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 10 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blue Ridge Sculpin 111
Blacknose Dace 82
Creek Chub 16
Rosyside Dace 16
Longnose Dace 11
Bluegill 9
Fallfish 7
Tessellated Darter 3
White Sucker 2
Largemouth Bass 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

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

Crayfish:
No crayfish noted.

Exotic Plants:
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ephemerella Sulphur Mayfly 65
Amphinemura Spring Stonefly 14
Prosimulium Black Fly 8
Simulium Black Fly 4
Ameletus Combmouthed Minnow Mayfly 3
Heptageniidae Flathead Mayfly 3
Eukiefferiella Non-Biting Midges 2
Perlodidae Perlodid Stonefly 2
Baetidae Small Minnow Mayfly 2
Thienemanniella Non-Biting Midges 1
Clinocera Aquatic Dance Fly 1
Cheumatopsyche Net-Spinning Caddisfly 1
Diplectrona Net-Spinning Caddisfly 1
Conchapelopia Non-Biting Midges 1
Neophylax Caddisfly 1
Gomphidae Clubtail 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.