MBSS Site Summary for: PRAL-106-R-2001

Site Photos

Field photo showing stream conditions at site PRAL-106-R-2001-1 (Opens in a new window)

Located on ROBY HOLLOW UT1 in the Potomac River AL Cnty watershed, 8-digit code: 02140508.
This stream was visited in the spring on 3/27/2001 and again in the summer on 6/27/2001.

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 N R
Benthic IBI Fair - 3.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 115 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 8 %
Agricultural Land Use 0 %
Forested Land Use 92 %


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

Physical Stream Habitat
Instream Habitat not sampled
Epifaunal Substrate not sampled
Velocity/Depth Diversity not sampled
Pool Quality not sampled
Riffle Quality not sampled
Shading not sampled
Embeddedness not sampled


Stream Water Quality:
pH (lab) 6.77
Alkalinity
(acid neutralizing capacity) 		120.7 µeq/L
Dissolved organic carbon (DOC) 1.9 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:
Fish data is unavailable or no fish observed.

Amphibians and Reptiles:
No amphibians and reptiles noted.

Crayfish:
Cambaridae

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Prosimulium Black Fly 25
Ephemerella Sulphur Mayfly 22
Parametriocnemus Non-Biting Midges 12
Stegopterna Black Fly 8
Atherix 6
Micropsectra Non-Biting Midges 5
Leptophlebiidae Pronggilled Mayfly 4
Leuctridae Rolledwinged Stonefly 4
Amphinemura Spring Stonefly 4
Sweltsa Stonefly 4
Philopotamidae Fingernet Caddisfly 4
Nemouridae Nemourid Stonefly 3
Chaetocladius Non-Biting Midges 2
Crangonyx Amphipod 2
Ceratopogon Biting Midge 1
Dixa 1
Ormosia Cranefly 1
Isotomurus Elongate-Bodied Springtail 1
Wormaldia Fingernet Caddisfly 1
Rhyacophila Free-Living Caddisfly 1
Caecidotea Isopod 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.