MBSS Site Summary for: PAXU-108-R-2008
Located on UT TO PATUXENT RIVER in the Patuxent River upper watershed,
8-digit code: 02131104.
This stream was visited in the spring on 3/25/2008 and again in the summer on 6/27/2008.
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 - 1.7 / 5.0
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Benthic IBI
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Fair - 3.6 / 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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1,632 acres
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An example of a highly channelized urban stream.
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Urban Land Use
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56.6 %
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Agricultural Land Use
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14.6 %
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Forested Land Use
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27 %
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Stream Water Quality:
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| Water temperature |
22.6 ° C
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| Dissolved oxygen (DO) |
2.5 mg/L
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Dissolved oxygen levels measured in the stream were very low (2.5 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.76 |
| Conductivity |
308 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
689.3 µeq/L |
| Dissolved organic carbon (DOC) |
3.5132 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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The following 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Common name |
Count |
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Eastern Mosquitofish
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23 |
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Eastern Mudminnow
|
1 |
Electrofishing to sample fish communities.
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| Common Five-Lined Skink |
| Eastern Box Turtle |
| Fowler's Toad |
| Northern Green Frog |
| Pickerel Frog |
| Garlic Mustard |
| Japanese Barberry |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
| Mile-A-Minute |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Hydrobaenus |
Midge
|
22 |
| Crangonyx |
Amphipod
|
19 |
| Dicrotendipes |
Non-Biting Midges
|
17 |
| Natarsia |
Non-Biting Midges
|
5 |
| Polypedilum |
Non-Biting Midges
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4 |
| Trichocorixa |
|
4 |
| Pisidium |
Freshwater Pea (Pill) Clam
|
4 |
| Campeloma |
|
3 |
| Clinotanypus |
Non-Biting Midge
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2 |
| Tanytarsus |
Non-Biting Midges
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2 |
| Thienemannimyia Group |
Non-Biting Midges
|
2 |
| Orthocladius |
Non-Biting Midges
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2 |
| Paraphaenocladius |
Non-Biting Midges
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2 |
| Polycentropus |
Tube Maker Caddisfly
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2 |
| Limnodrilus |
Worm
|
1 |
| Tribelos |
Non-Biting Midges
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1 |
| Lymnaeidae |
Pond Snail
|
1 |
| Ephemerellidae |
Spiny Crawler Mayfly
|
1 |
| Eukiefferiella |
Non-Biting Midges
|
1 |
| Nanocladius |
Non-Biting Midges
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1 |
| Caecidotea |
Isopod
|
1 |
| Cheumatopsyche |
Net-Spinning Caddisfly
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1 |
| Ablabesmyia |
Non-Biting Midge
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1 |
| Helius |
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1 |
| Neoporus |
|
1 |
| Stilobezzia |
|
1 |
| Parakiefferiella |
European Non-Biting Midge
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1 |
| Stenochironomus |
European Non-Biting Midge
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1 |
| Musculium |
Fingernail Clam
|
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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