MBSS Site Summary for: SBPA-101-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 7/13/2009.
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 - 5.0 / 5.0
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Benthic IBI
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Fair - 3.7 / 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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3,806 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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2 %
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Agricultural Land Use
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78.7 %
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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 |
16.3 ° C
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| Dissolved oxygen (DO) |
9 mg/L
|
| pH (lab) |
7.38 |
| Conductivity |
165 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
327.1 µeq/L |
| Dissolved organic carbon (DOC) |
0.3863 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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| Eastern American Toad |
| Northern Red Salamander |
| Northern Two-Lined Salamander |
| 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 |
| Amphinemura |
Spring Stonefly
|
15 |
| Ephemerella |
Sulphur Mayfly
|
10 |
| Cheumatopsyche |
Net-Spinning Caddisfly
|
8 |
| Rheotanytarsus |
Non-Biting Midges
|
7 |
| Baetidae |
Small Minnow Mayfly
|
6 |
| Paraphaenocladius |
Non-Biting Midges
|
5 |
| Orthocladius |
Non-Biting Midges
|
5 |
| Neophylax |
Caddisfly
|
5 |
| Thienemannimyia Group |
Non-Biting Midges
|
4 |
| Chaetocladius |
Non-Biting Midges
|
3 |
| Chimarra |
Fingernet Caddisfly
|
3 |
| Acroneuria |
Golden Stoneflies
|
3 |
| Strophopteryx |
Early Brown Stonefly
|
2 |
| Antocha |
Crane Fly
|
2 |
| Chelifera |
Aquatic Dance Fly
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2 |
| Prosimulium |
Black Fly
|
2 |
| Simulium |
Black Fly
|
2 |
| Paratanytarsus |
Non-Biting Midges
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2 |
| Polypedilum |
Non-Biting Midges
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2 |
| Oulimnius |
Riffle Beetle
|
2 |
| Leuctridae |
Rolledwinged Stonefly
|
2 |
| Tvetenia |
Non-Biting Midges
|
1 |
| Elmidae |
Riffle Beetle
|
1 |
| Optioservus |
Riffle Beetle
|
1 |
| Tanypodinae |
Non-Biting Midges
|
1 |
| Thienemanniella |
Non-Biting Midges
|
1 |
| Corynoneura |
Non-Biting Midges
|
1 |
| Parametriocnemus |
Non-Biting Midges
|
1 |
| Clinocera |
Aquatic Dance Fly
|
1 |
| Tipula |
Crane Fly
|
1 |
| Hydropsychidae |
Common Netspinner Caddisfly
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1 |
| Ceratopsyche |
|
1 |
| Hydropsyche |
Net-Spinning Caddisfly
|
1 |
| Orthocladiinae |
Midge
|
1 |
| Xylotopus |
Midge
|
1 |
| Lype |
Net Tube Caddisfly
|
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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