MBSS Site Summary for: NASS-301-S-2000
Located on NASSAWANGO CR in the Nassawango Creek watershed,
8-digit code: 02130205.
This stream was visited in the spring on 3/28/2000 and again in the summer on 9/12/2000.
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 - 4.0 / 5.0
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Benthic IBI
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Good - 4.1 / 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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9,547 acres
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An example of a forested stream.
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Urban Land Use
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1.3 %
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Agricultural Land Use
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36.3 %
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Forested Land Use
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58.8 %
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An example of woody debris in a stream.
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Physical Stream Habitat
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Instream Habitat
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19/20 (Optimal)
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Epifaunal Substrate
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16/20 (Optimal)
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Velocity/Depth Diversity
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9/20 (Marginal)
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Pool Quality
Pool Extent = 75 meters
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18/20 (Optimal)
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Riffle Quality
Riffle Extent = 25 meters
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15/20 (Suboptimal)
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Shading
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90 % |
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Embeddedness
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100 % |
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The embeddedness, a measure of silt on the stream bottom, was 100%. This is
very high, and may adversely affect biotic communities.
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Several measures of instream habitat were considered 'Optimal' at this location.
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Stream Water Quality:
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| Water temperature |
20.7 ° C
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| Dissolved oxygen (DO) |
2.7 mg/L
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Dissolved oxygen levels measured in the stream were very low (2.7 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.07 |
| Conductivity |
90 µmho/cm
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Alkalinity
(acid neutralizing capacity)
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130.8 µeq/L |
| Dissolved organic carbon (DOC) |
17.8 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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| American Bullfrog |
| Eastern Ratsnake |
| Northern Green Frog |
| Southern Leopard Frog |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Caecidotea |
Isopod
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29 |
| Conchapelopia |
Non-Biting Midges
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18 |
| Perlesta |
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16 |
| Cnephia |
Black Fly
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7 |
| Ablabesmyia |
Non-Biting Midge
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6 |
| Leptophlebiidae |
Pronggilled Mayfly
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6 |
| Simulium |
Black Fly
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5 |
| Tanytarsus |
Non-Biting Midges
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4 |
| Polypedilum |
Non-Biting Midges
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2 |
| Sphaerium |
Fingernail Clam
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2 |
| Physa |
Air-Breathing Freshwater Snail
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2 |
| Amphipoda |
Scud
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2 |
| Crangonyctidae |
Scud
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1 |
| Prostoia |
Spring Stonefly
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1 |
| Parachironomus |
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1 |
| Menetus |
Air Breathing Freshwater Snail
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1 |
| Triaenodes |
Long-Horned Caddisfly
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1 |
| Cricotopus/Orthocladius |
Midge
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1 |
| Potthastia |
Non-Biting Midges
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1 |
| Rheocricotopus |
Non-Biting Midges
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1 |
| Rheosmittia |
Non-Biting Midges
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1 |
| Tribelos |
Non-Biting Midges
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1 |
| Psectrocladius |
Non-Biting Midge
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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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