MBSS Site Summary for: PAXL-116-R-2004
Located on CHESAPEAKE BAY UT in the Patuxent River lower watershed,
8-digit code: 02131101.
This stream was visited in the spring on 3/4/2004 and again in the summer on 7/12/2004.
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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Poor - 2.0 / 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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88 acres
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An example of a forested stream.
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Urban Land Use
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4 %
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Agricultural Land Use
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38 %
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Forested Land Use
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53 %
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Stream Water Quality:
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| Water temperature |
22.5 ° C
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| Dissolved oxygen (DO) |
6.9 mg/L
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| pH (lab) |
6.29 |
| Conductivity |
119 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
83.5 µeq/L |
| Dissolved organic carbon (DOC) |
1.9 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 3 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Common name |
Count |
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Eastern Mudminnow
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44 |
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American Eel
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9 |
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Pumpkinseed
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1 |
Electrofishing to sample fish communities.
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| American Bullfrog |
| Eastern Box Turtle |
| Gray Treefrog |
| Northern Green Frog |
| Northern Spring Peeper |
| Southern Leopard Frog |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Parametriocnemus |
Non-Biting Midges
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16 |
| Stegopterna |
Black Fly
|
15 |
| Synurella |
Amphipod
|
8 |
| Thienemannimyia group |
Non-Biting Midges
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7 |
| Leptophlebiidae |
Pronggilled Mayfly
|
7 |
| Leuctra |
Rolled-Winged Stonefly
|
6 |
| Musculium |
Fingernail Clam
|
6 |
| Diplectrona |
Net-Spinning Caddisfly
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5 |
| Chimarra |
Fingernet Caddisfly
|
4 |
| Heteroplectron |
Caddisfly
|
4 |
| Anchytarsus |
Beetle
|
3 |
| Chironomini |
Non-Biting Midge
|
3 |
| Caecidotea |
Isopod
|
3 |
| Triaenodes |
Long-Horned Caddisfly
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2 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
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2 |
| Tipulidae |
Cranefly
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2 |
| Calopteryx |
Damselfly
|
1 |
| Chrysops |
Deerfly
|
1 |
| Odonata |
Dragonfly, Damselfly
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1 |
| Sialis |
Alderfly
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1 |
| Spirosperma |
Aquatic Oligochaete Worm
|
1 |
| Ceratopogonidae |
Biting Midge
|
1 |
| Clinotanypus |
Non-Biting Midge
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1 |
| Apsectrotanypus |
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 |
| Nigronia |
Megaloptera (Dark Fishfly)
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1 |
| Thienemanniella |
Non-Biting Midges
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1 |
| Dromogomphus |
Spinylegs Dragonfly
|
1 |
| Leptophlebia |
Pronggilled Mayfly
|
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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