MBSS Site Summary for: PAXU-101-R-2004
Located on NEWSTOP BR in the Patuxent River upper watershed,
8-digit code: 02131104.
This stream was visited in the spring on 3/9/2004 and again in the summer on 6/9/2004.
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 - 3.7 / 5.0
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Benthic IBI
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Fair - 3.0 / 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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609 acres
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An example of a highly channelized urban stream.
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Urban Land Use
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52 %
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Agricultural Land Use
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13 %
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Forested Land Use
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35 %
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Stream Water Quality:
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| Water temperature |
20.1 ° C
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| Dissolved oxygen (DO) |
7.1 mg/L
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| pH (lab) |
7.02 |
| Conductivity |
251 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
669.6 µeq/L |
| Dissolved organic carbon (DOC) |
7.1 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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| Gray Treefrog |
| Northern Green Frog |
| Northern Two-Lined Salamander |
| Japanese Honeysuckle |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Cheumatopsyche |
Net-Spinning Caddisfly
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27 |
| Stenochironomus |
European Non-Biting Midge
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20 |
| Orthocladius |
Non-Biting Midges
|
9 |
| Rheosmittia |
Non-Biting Midges
|
7 |
| Limnephilidae |
Northern Casemaker Caddisfly
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6 |
| Thienemannimyia group |
Non-Biting Midges
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5 |
| Coenagrionidae |
Narrowwinged Damselfly
|
5 |
| Spirosperma |
Aquatic Oligochaete Worm
|
4 |
| Tubificidae |
Aquatic Worm
|
3 |
| Hydrobaenus |
Midge
|
3 |
| Tvetenia |
Non-Biting Midges
|
3 |
| Zavrelimyia |
Non-Biting Midges
|
3 |
| Pisidiidae |
Pill Clam
|
2 |
| Argia |
Narrow-Winged Damselfly
|
2 |
| Tanypodinae |
Non-Biting Midges
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2 |
| Parametriocnemus |
Non-Biting Midges
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2 |
| Orthocladiinae |
Midge
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2 |
| Simulium |
Black Fly
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2 |
| Hydropsyche |
Net-Spinning Caddisfly
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2 |
| Cricotopus |
Non-Biting Midges
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2 |
| Micropsectra |
Non-Biting Midges
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1 |
| Tipula |
Crane Fly
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1 |
| Calopteryx |
Damselfly
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1 |
| Stenelmis |
Beetle
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1 |
| Enchytraeidae |
Aquatic Worm
|
1 |
| Musculium |
Fingernail Clam
|
1 |
| Girardia |
Freshwater Flatworm
|
1 |
| Ptilostomis |
Giant Casemaker Caddisfly
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1 |
| Nigronia |
Megaloptera (Dark Fishfly)
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1 |
| Paratanytarsus |
Non-Biting Midges
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1 |
| Polypedilum |
Non-Biting Midges
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1 |
| Libellulidae |
Skimmer Dragonfly
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1 |
| Ancyronyx |
Spider Riffle Beetle
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1 |
| Boyeria |
Spotted Darner Dragonfly
|
1 |
| Molophilus |
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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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