MBSS Site Summary for: PTOB-213-X-2005
Located on Port Tobacco Creek in the Port Tobacco River watershed,
8-digit code: 02140109.
This stream was visited in the spring on 7/7/2005 and again in the summer on 7/7/2005.
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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N R |
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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.
(Hint: Screen readers will announce definitions; mouse users can hover over dotted text.)
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Catchment area
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7,087 acres
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An example of a forested stream.
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Urban Land Use
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18 %
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Agricultural Land Use
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22 %
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Forested Land Use
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56 %
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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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17/20 (Optimal)
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Epifaunal Substrate
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14/20 (Suboptimal)
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Velocity/Depth Diversity
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15/20 (Suboptimal)
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Pool Quality
Pool Extent = 63 meters
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16/20 (Optimal)
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Riffle Quality
Riffle Extent = 36 meters
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16/20 (Optimal)
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Shading
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85 % |
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Embeddedness
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65 % |
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The embeddedness, a measure of silt on the stream bottom, was 65%. This is
relatively high, and may exclude some biota.
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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 |
22.2 ° C
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| Dissolved oxygen (DO) |
6.5 mg/L
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| Conductivity |
104 µmho/cm
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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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| Fish data is unavailable or no fish observed. |
| 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 |
| Hydrobaenus |
Midge
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40 |
| Stenelmis |
Beetle
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17 |
| Ephemerella |
Sulphur Mayfly
|
8 |
| Chloroperlidae |
Green Stonefly
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7 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
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6 |
| Isoperla |
Stripetail Stonefly
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6 |
| Clinocera |
Aquatic Dance Fly
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4 |
| Oulimnius |
Riffle Beetle
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4 |
| Strophopteryx |
Early Brown Stonefly
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3 |
| Cheumatopsyche |
Net-Spinning Caddisfly
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3 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
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2 |
| Crangonyx |
Amphipod
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1 |
| Stygobromus |
Amphipod
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1 |
| Synurella |
Amphipod
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1 |
| Prosimulium |
Black Fly
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1 |
| Neophylax |
Caddisfly
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1 |
| Stylogomphus |
Clubtail Dragonfly
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1 |
| Tipulidae |
Cranefly
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1 |
| Diplectrona |
Net-Spinning Caddisfly
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1 |
| Polypedilum |
Non-Biting Midges
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1 |
| Pseudorthocladius |
Non-Biting Midges
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1 |
| Tanytarsini |
Non-Biting Midges
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1 |
| Tanytarsus |
Non-Biting Midges
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1 |
| Thienemannimyia group |
Non-Biting Midges
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1 |
| Ironoquia |
Northern Caddisfly
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1 |
| Elmidae |
Riffle Beetle
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1 |
| Cordulegaster |
Spiketail Dragonfly
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1 |
| Lepidostoma |
Little Brown Sedge Caddisfly
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1 |
| Triaenodes |
Long-Horned Caddisfly
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1 |
| Lumbriculidae |
Worm
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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.
