MBSS Site Summary for: PAXL-294-S-2007
Located on Swanson Creek in the Patuxent River lower watershed,
8-digit code: 02131101.
This stream was visited in the spring on 3/28/2007 and again in the summer on 6/12/2007.
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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Fair - 3.7 / 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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3,717 acres
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An example of a forested stream.
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Urban Land Use
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3.6 %
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Agricultural Land Use
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30.9 %
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Forested Land Use
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62.6 %
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Stream Water Quality:
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| Water temperature |
18.5 ° C
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| Dissolved oxygen (DO) |
7.9 mg/L
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| pH (lab) |
7.01 |
| Conductivity |
100 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
165.5 µeq/L |
| Dissolved organic carbon (DOC) |
2.3526 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 Cricket Frog |
| Northern Two-Lined Salamander |
| Pickerel Frog |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Ephemerella |
Sulphur Mayfly
|
26 |
| Rheosmittia |
Non-Biting Midges
|
14 |
| Chloroperlidae |
Green Stonefly
|
10 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
|
8 |
| Oulimnius |
Riffle Beetle
|
7 |
| Amphinemura |
Spring Stonefly
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7 |
| Cheumatopsyche |
Net-Spinning Caddisfly
|
5 |
| Rheocricotopus |
Non-Biting Midges
|
3 |
| Leuctra |
Rolled-Winged Stonefly
|
3 |
| Gammarus |
Amphipod
|
2 |
| Stenonema |
Flatheaded Mayfly
|
2 |
| Nigronia |
Megaloptera (Dark Fishfly)
|
2 |
| Ancyronyx |
Spider Riffle Beetle
|
2 |
| Thienemannimyia group |
Non-Biting Midges
|
2 |
| Hydropsyche |
Net-Spinning Caddisfly
|
2 |
| Stenelmis |
Beetle
|
2 |
| Ceratopogonidae |
Biting Midge
|
2 |
| Probezzia |
Biting Midges
|
1 |
| Perlidae |
Common Stonefly
|
1 |
| Hexatoma |
Crane Fly
|
1 |
| Pseudolimnophila |
Crane Fly
|
1 |
| Heleniella |
European Non-Biting Midge
|
1 |
| Parakiefferiella |
European Non-Biting Midge
|
1 |
| Ablabesmyia |
Non-Biting Midge
|
1 |
| Brillia |
Non-Biting Midges
|
1 |
| Eukiefferiella |
Non-Biting Midges
|
1 |
| Orthocladius |
Non-Biting Midges
|
1 |
| Parametriocnemus |
Non-Biting Midges
|
1 |
| Paraphaenocladius |
Non-Biting Midges
|
1 |
| Dubiraphia |
Riffle Beetle
|
1 |
| Macronychus |
Riffle Beetle
|
1 |
| Tanypodinae |
Non-Biting Midges
|
1 |
| Orthocladiinae |
Midge
|
1 |
| Lepidoptera |
Aquatic Moth
|
1 |
| Anchytarsus |
Beetle
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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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