MBSS Site Summary for: PRLT-112-B-2008
Located on DITCHLEY PRONG in the Potomac River L tidal watershed,
8-digit code: 02140101.
This stream was visited in the spring on 3/5/2008 and again in the summer on 7/22/2008.
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.
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Fish IBI
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Poor - 2.7 / 5.0
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Benthic IBI
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Good - 4.7 / 5.0
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Land Use
Land use can provide important information for determining stream health.
(Hint: Screen readers will announce definitions; mouse users can hover over dotted text.)
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Catchment area
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979 acres
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An example of a forested stream.
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Urban Land Use
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3.3 %
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Agricultural Land Use
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34.7 %
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Forested Land Use
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61.1 %
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Stream Water Quality:
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| Water temperature |
22.7 ° C
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| Dissolved oxygen (DO) |
3.5 mg/L
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Dissolved oxygen levels measured in the stream were very low (3.5 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.26 |
| Conductivity |
99 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
82.3 µeq/L |
| Dissolved organic carbon (DOC) |
5.5367 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.
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| American Bullfrog |
| Eastern American Toad |
| Eastern Cricket Frog |
| Northern Green Frog |
| Northern Spring Peeper |
| Northern Two-Lined Salamander |
| Upland Chorus Frog |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Micropsectra |
Non-Biting Midges
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11 |
| Perlidae |
Common Stonefly
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8 |
| Eurylophella |
Mayfly
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8 |
| Diplocladius |
Non-Biting Midges
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7 |
| Orthocladius |
Non-Biting Midges
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6 |
| Parametriocnemus |
Non-Biting Midges
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6 |
| Thienemannimyia Group |
Non-Biting Midges
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6 |
| Eukiefferiella |
Non-Biting Midges
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4 |
| Diplectrona |
Net-Spinning Caddisfly
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4 |
| Stenelmis |
Beetle
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4 |
| Tubificidae |
Aquatic Worm
|
3 |
| Ptilostomis |
Giant Casemaker Caddisfly
|
3 |
| Clioperla |
Green-Winged Stonefly
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3 |
| Oulimnius |
Riffle Beetle
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3 |
| Zavrelimyia |
Non-Biting Midges
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2 |
| Tanypodinae |
Non-Biting Midges
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2 |
| Parakiefferiella |
European Non-Biting Midge
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2 |
| Hydrobaenus |
Midge
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2 |
| Neophylax |
Caddisfly
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2 |
| Caecidotea |
Isopod
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2 |
| Simuliidae |
Black Fly
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2 |
| Stegopterna |
Black Fly
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1 |
| Ormosia |
Cranefly
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1 |
| Anchytarsus |
Beetle
|
1 |
| Ceratopogon |
Biting Midge
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1 |
| Musculium |
Fingernail Clam
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1 |
| Rhyacophila |
Free-Living Caddisfly
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1 |
| Tabanidae |
Horse Fly
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1 |
| Microtendipes |
Non-Biting Midges
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1 |
| Dicrotendipes |
Non-Biting Midges
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1 |
| Limnephilidae |
Northern Casemaker Caddisfly
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1 |
| Leptophlebia |
Pronggilled Mayfly
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1 |
| Amphinemura |
Spring Stonefly
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1 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
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1 |
Sampling with a kick net.
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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.
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