MBSS Site Summary for: PAXL-205-R-2004
Located on TOM WALLS BR 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 7/20/2004.
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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Fair - 3.3 / 5.0
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Benthic IBI
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Good - 4.4 / 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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1,701 acres
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An example of a forested stream.
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Urban Land Use
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6 %
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Agricultural Land Use
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33 %
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Forested Land Use
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59 %
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Stream Water Quality:
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| Water temperature |
20.6 ° C
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| Dissolved oxygen (DO) |
7.1 mg/L
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| pH (lab) |
6.85 |
| Conductivity |
164 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
241.7 µeq/L |
| Dissolved organic carbon (DOC) |
2.3 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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| Fowler's Toad |
| Green Treefrog |
| Northern Green Frog |
| Northern Two-Lined Salamander |
| Pickerel Frog |
| Southern Leopard 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 |
| Caecidotea |
Isopod
|
35 |
| Thienemannimyia group |
Non-Biting Midges
|
28 |
| Paraphaenocladius |
Non-Biting Midges
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20 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
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14 |
| Rheosmittia |
Non-Biting Midges
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12 |
| Stenochironomus |
European Non-Biting Midge
|
11 |
| Nemouridae |
Nemourid Stonefly
|
10 |
| Orthocladius |
Non-Biting Midges
|
10 |
| Polypedilum |
Non-Biting Midges
|
10 |
| Isoperla |
Stripetail Stonefly
|
9 |
| Tanytarsus |
Non-Biting Midges
|
7 |
| Ptilostomis |
Giant Casemaker Caddisfly
|
7 |
| Zavrelimyia |
Non-Biting Midges
|
5 |
| Limnephilidae |
Northern Casemaker Caddisfly
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5 |
| Lype |
Net Tube Caddisfly
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4 |
| Corynoneura |
Non-Biting Midges
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3 |
| Trissopelopia |
Non-Biting Midges
|
3 |
| Tvetenia |
Non-Biting Midges
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3 |
| Eccoptura |
Yellow Stone Stonefly
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3 |
| Diptera |
True Fly
|
2 |
| Ironoquia |
Northern Caddisfly
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2 |
| Eukiefferiella |
Non-Biting Midges
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2 |
| Phaenopsectra |
Non-Biting Midges
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1 |
| Odontomesa |
Non-Biting Midge
|
1 |
| Brillia |
Non-Biting Midges
|
1 |
| Nigronia |
Megaloptera (Dark Fishfly)
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1 |
| Dixa |
|
1 |
| Gammarus |
Amphipod
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1 |
| Anchytarsus |
Beetle
|
1 |
| Ceratopogonidae |
Biting Midge
|
1 |
| Stegopterna |
Black Fly
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1 |
| Strophopteryx |
Early Brown Stonefly
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1 |
| Leptophlebiidae |
Pronggilled Mayfly
|
1 |
| Capniidae |
Small Winter Stonefly
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1 |
| Oemopteryx |
Stonefly
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1 |
| Ephemerella |
Sulphur Mayfly
|
1 |
| Hemerodromia |
Tiny Fly
|
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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