MBSS Site Summary for: PAXL-125-R-2004
Located on PATUXENT R UT 6 in the Patuxent River lower watershed,
8-digit code: 02131101.
This stream was visited in the spring on 3/9/2004 and again in the summer on 7/13/2004.
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 - 2.0 / 5.0
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Benthic IBI
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Good - 5.0 / 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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437 acres
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An example of a forested stream.
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Urban Land Use
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9 %
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Agricultural Land Use
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40 %
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Forested Land Use
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50 %
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Stream Water Quality:
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| Water temperature |
21 ° C
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| Dissolved oxygen (DO) |
8.1 mg/L
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| pH (lab) |
7.13 |
| Conductivity |
131 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
372.1 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.
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| American Bullfrog |
| Fowler's Toad |
| Northern Green Frog |
| Northern Two-Lined Salamander |
| Southern Leopard Frog |
| Japanese Honeysuckle |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Gammarus |
Amphipod
|
49 |
| Ephemerella |
Sulphur Mayfly
|
20 |
| Diplectrona |
Net-Spinning Caddisfly
|
14 |
| Limnephilidae |
Northern Casemaker Caddisfly
|
7 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
|
6 |
| Prosimulium |
Black Fly
|
6 |
| Lype |
Net Tube Caddisfly
|
5 |
| Prostoia |
Spring Stonefly
|
4 |
| Allocapnia |
Small Winter Stonefly
|
4 |
| Polypedilum |
Non-Biting Midges
|
4 |
| Thienemannimyia group |
Non-Biting Midges
|
4 |
| Orthocladius |
Non-Biting Midges
|
3 |
| Parametriocnemus |
Non-Biting Midges
|
3 |
| Paraphaenocladius |
Non-Biting Midges
|
3 |
| Chloroperlidae |
Green Stonefly
|
3 |
| Nemouridae |
Nemourid Stonefly
|
3 |
| Xylotopus |
Midge
|
2 |
| Chrysops |
Deerfly
|
2 |
| Synurella |
Amphipod
|
2 |
| Zavrelimyia |
Non-Biting Midges
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2 |
| Leptophlebia |
Pronggilled Mayfly
|
2 |
| Leptophlebiidae |
Pronggilled Mayfly
|
2 |
| Boyeria |
Spotted Darner Dragonfly
|
1 |
| Ironoquia |
Northern Caddisfly
|
1 |
| Tvetenia |
Non-Biting Midges
|
1 |
| Rheosmittia |
Non-Biting Midges
|
1 |
| Thienemanniella |
Non-Biting Midges
|
1 |
| Anchytarsus |
Beetle
|
1 |
| Ceratopogonidae |
Biting Midge
|
1 |
| Neophylax |
Caddisfly
|
1 |
| Pseudolimnophila |
Crane Fly
|
1 |
| Tipula |
Crane Fly
|
1 |
| Ptilostomis |
Giant Casemaker Caddisfly
|
1 |
| Dixa |
|
1 |
| Micropsectra |
Non-Biting Midges
|
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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