MBSS Site Summary for: SBPA-316-A-2009
Located on Gillis Falls in the S Branch Patapsco watershed,
8-digit code: 02130908.
This stream was visited in the spring on 3/23/2009 and again in the summer on 7/9/2009.
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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Good - 4.7 / 5.0
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Benthic IBI
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Good - 4.0 / 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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12,313 acres
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Cows survey the sampling procedure at this extreme example of a highly agriculturalized site.
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Urban Land Use
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1.4 %
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Agricultural Land Use
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79 %
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Forested Land Use
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18.4 %
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Stream Water Quality:
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| Water temperature |
16.6 ° C
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| Dissolved oxygen (DO) |
8.9 mg/L
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| pH (lab) |
7.41 |
| Conductivity |
158 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
443.8 µeq/L |
| Dissolved organic carbon (DOC) |
0.5051 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 |
| Long-Tailed Salamander |
| Northern Two-Lined Salamander |
| Wood Frog |
| Garlic Mustard |
| Japanese Stiltgrass |
| Mile-A-Minute |
| Multiflora Rose |
| Purple Loosestrife |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Ephemerellidae |
Spiny Crawler Mayfly
|
18 |
| Strophopteryx |
Early Brown Stonefly
|
13 |
| Orthocladius |
Non-Biting Midges
|
12 |
| Prosimulium |
Black Fly
|
9 |
| Amphinemura |
Spring Stonefly
|
8 |
| Hydrobaenus |
Midge
|
7 |
| Chimarra |
Fingernet Caddisfly
|
5 |
| Microtendipes |
Non-Biting Midges
|
4 |
| Parametriocnemus |
Non-Biting Midges
|
4 |
| Tvetenia |
Non-Biting Midges
|
4 |
| Isonychia |
Slate Drake Mayfly
|
4 |
| Orthocladiinae |
Midge
|
3 |
| Neophylax |
Caddisfly
|
2 |
| Antocha |
Crane Fly
|
2 |
| Rheotanytarsus |
Non-Biting Midges
|
2 |
| Thienemannimyia Group |
Non-Biting Midges
|
2 |
| Polycentropus |
Tube Maker Caddisfly
|
1 |
| Dineutus |
Whirlygig Beetle
|
1 |
| Centroptilum |
Small Minnow Mayfly
|
1 |
| Capniidae |
Small Winter Stonefly
|
1 |
| Polypedilum |
Non-Biting Midges
|
1 |
| Potthastia |
Non-Biting Midges
|
1 |
| Tipula |
Crane Fly
|
1 |
| Heptageniidae |
Flathead Mayfly
|
1 |
| Maccaffertium |
March Brown And Cahill Mayfly
|
1 |
| Nemouridae |
Nemourid Stonefly
|
1 |
| Lype |
Net Tube Caddisfly
|
1 |
| Cheumatopsyche |
Net-Spinning Caddisfly
|
1 |
| Brillia |
Non-Biting Midges
|
1 |
| Natarsia |
Non-Biting Midges
|
1 |
| Ceratopsyche |
|
1 |
| Leuctra |
Rolled-Winged Stonefly
|
1 |
| Clinocera |
Aquatic Dance Fly
|
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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