MBSS Site Summary for: PAXL-124-R-2004
Located on HORSE LANDING CR 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 7/7/2004.
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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Good - 4.7 / 5.0
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Land Use
Land use can provide important information for determining stream health.
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Catchment area
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777 acres
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An example of a forested stream.
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Urban Land Use
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12 %
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Agricultural Land Use
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29 %
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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 |
22.4 ° C
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| Dissolved oxygen (DO) |
7.9 mg/L
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| pH (lab) |
7.5 |
| Conductivity |
183 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
753.6 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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Blacknose Dace
|
125 |
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Eastern Mudminnow
|
109 |
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American Eel
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3 |
Electrofishing to sample fish communities.
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| Northern Green Frog |
| Northern Spring Peeper |
| Northern Two-Lined Salamander |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Gammarus |
Amphipod
|
18 |
| Nemouridae |
Nemourid Stonefly
|
15 |
| Thienemannimyia group |
Non-Biting Midges
|
12 |
| Orthocladius |
Non-Biting Midges
|
10 |
| Leptophlebia |
Pronggilled Mayfly
|
8 |
| Ephemerella |
Sulphur Mayfly
|
7 |
| Diplectrona |
Net-Spinning Caddisfly
|
6 |
| Rheosmittia |
Non-Biting Midges
|
5 |
| Parametriocnemus |
Non-Biting Midges
|
4 |
| Eccoptura |
Yellow Stone Stonefly
|
4 |
| Amphinemura |
Spring Stonefly
|
4 |
| Tipula |
Crane Fly
|
4 |
| Chloroperlidae |
Green Stonefly
|
4 |
| Anchytarsus |
Beetle
|
3 |
| Leptophlebiidae |
Pronggilled Mayfly
|
3 |
| Polypedilum |
Non-Biting Midges
|
3 |
| Limnephilidae |
Northern Casemaker Caddisfly
|
3 |
| Perlodidae |
Perlodid Stonefly
|
2 |
| Tanytarsini |
Non-Biting Midges
|
2 |
| Natarsia |
Non-Biting Midges
|
2 |
| Leuctridae |
Rolledwinged Stonefly
|
2 |
| Capniidae |
Small Winter Stonefly
|
2 |
| Dromogomphus |
Spinylegs Dragonfly
|
2 |
| Stenonema |
Flatheaded Mayfly
|
2 |
| Nigronia |
Megaloptera (Dark Fishfly)
|
2 |
| Orthocladiinae |
Midge
|
2 |
| Lype |
Net Tube Caddisfly
|
1 |
| Brillia |
Non-Biting Midges
|
1 |
| Corynoneura |
Non-Biting Midges
|
1 |
| Nanocladius |
Non-Biting Midges
|
1 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
|
1 |
| Clioperla |
Green-Winged Stonefly
|
1 |
| Prosimulium |
Black Fly
|
1 |
| Simuliidae |
Black Fly
|
1 |
| Nemoura |
|
1 |
| Thienemanniella |
Non-Biting Midges
|
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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