MBSS Site Summary for: LPAX-302-R-2009
Located on Little Patuxent River in the Little Patuxent River watershed,
8-digit code: 02131105.
This stream was visited in the spring on 3/3/2009 and again in the summer on 6/25/2009.
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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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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7,681 acres
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An example of a highly channelized urban stream.
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Urban Land Use
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59.4 %
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Agricultural Land Use
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17 %
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Forested Land Use
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22.6 %
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An example of woody debris in a stream.
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Physical Stream Habitat
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Instream Habitat
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15/20 (Suboptimal)
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Epifaunal Substrate
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14/20 (Suboptimal)
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Velocity/Depth Diversity
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17/20 (Optimal)
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Pool Quality
Pool Extent = 71 meters
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17/20 (Optimal)
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Riffle Quality
Riffle Extent = 5 meters
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17/20 (Optimal)
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Shading
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65 % |
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Embeddedness
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55 % |
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The embeddedness, a measure of silt on the stream bottom, was 55%. This is
relatively high, and may exclude some biota.
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Several measures of instream habitat were considered 'Optimal' at this location.
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Stream Water Quality:
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| Water temperature |
21.2 ° C
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| Dissolved oxygen (DO) |
7.5 mg/L
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| pH (lab) |
7.77 |
| Conductivity |
445 µmho/cm
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Alkalinity
(acid neutralizing capacity)
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1239.4 µeq/L |
| Dissolved organic carbon (DOC) |
1.3215 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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| Northern Green Frog |
| Pickerel Frog |
| Garlic Mustard |
| Japanese Honeysuckle |
| Japanese Hops |
| Japanese Stiltgrass |
| Mile-A-Minute |
| Multiflora Rose |
| Oriental Bittersweet |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Orthocladius |
Non-Biting Midges
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39 |
| Hydropsyche |
Net-Spinning Caddisfly
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9 |
| Ceratopsyche |
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7 |
| Cheumatopsyche |
Net-Spinning Caddisfly
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6 |
| Hydrobaenus |
Midge
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5 |
| Antocha |
Crane Fly
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5 |
| Orthocladiinae |
Midge
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4 |
| Leucotrichia |
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3 |
| Synorthocladius |
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2 |
| Synurella |
Amphipod
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2 |
| Clinocera |
Aquatic Dance Fly
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2 |
| Naididae |
Aquatic Worm
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2 |
| Corbicula |
Basket Clam
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1 |
| Prosimulium |
Black Fly
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1 |
| Simulium |
Black Fly
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1 |
| Chimarra |
Fingernet Caddisfly
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1 |
| Maccaffertium |
March Brown And Cahill Mayfly
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1 |
| Goniobasis |
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1 |
| Brillia |
Non-Biting Midges
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1 |
| Corynoneura |
Non-Biting Midges
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1 |
| Microtendipes |
Non-Biting Midges
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1 |
| Argia |
Narrow-Winged Damselfly
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1 |
| Parametriocnemus |
Non-Biting Midges
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1 |
| Rheocricotopus |
Non-Biting Midges
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1 |
| Rheotanytarsus |
Non-Biting Midges
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1 |
| Tanytarsini |
Non-Biting Midges
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1 |
| Thienemanniella |
Non-Biting Midges
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1 |
| Tvetenia |
Non-Biting Midges
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1 |
| Isonychia |
Slate Drake Mayfly
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1 |
| Psychomyia |
Trumpet-Net Caddisfly
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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.
