MBSS Site Summary for: PAXM-101-X-2006
Located on Two Run Branch UT1 in the Patuxent River middle watershed,
8-digit code: 02131102.
This stream was visited in the spring on 3/21/2006 and again in the summer on 6/15/2006.
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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Fair - 3.0 / 5.0
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Benthic IBI
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Fair - 3.9 / 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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137 acres
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An example of a forested stream.
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Urban Land Use
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2 %
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Agricultural Land Use
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47 %
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Forested Land Use
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49 %
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Stream Water Quality:
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| Water temperature |
16.7 ° C
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| Dissolved oxygen (DO) |
4.5 mg/L
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Dissolved oxygen levels measured in the stream were very low (4.5 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
5.81 |
| Conductivity |
203 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
119 µeq/L |
| Dissolved organic carbon (DOC) |
1.9026 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 |
| Northern Green Frog |
| Northern Two-Lined Salamander |
| Pickerel Frog |
| 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 |
| Chaetocladius |
Non-Biting Midges
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12 |
| Diplocladius |
Non-Biting Midges
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12 |
| Anchytarsus |
Beetle
|
9 |
| Hydrobaenus |
Midge
|
9 |
| Caecidotea |
Isopod
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7 |
| Orthocladius |
Non-Biting Midges
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5 |
| Phaenopsectra |
Non-Biting Midges
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4 |
| Synurella |
Amphipod
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4 |
| Probezzia |
Biting Midges
|
3 |
| Tipulidae |
Cranefly
|
3 |
| Orthocladiinae |
Midge
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3 |
| Ablabesmyia |
Non-Biting Midge
|
3 |
| Tanypodinae |
Non-Biting Midges
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3 |
| Thienemannimyia group |
Non-Biting Midges
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3 |
| Diplectrona |
Net-Spinning Caddisfly
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2 |
| Bezzia |
Biting Midge
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1 |
| Micropsectra |
Non-Biting Midges
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1 |
| Microtendipes |
Non-Biting Midges
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1 |
| Heterotrissocladius |
European Non-Biting Midge
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1 |
| Ptilostomis |
Giant Casemaker Caddisfly
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1 |
| Naididae |
Aquatic Worm
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1 |
| Tubificidae |
Aquatic Worm
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1 |
| Dixella |
|
1 |
| Limnophila |
|
1 |
| Crangonyx |
Amphipod
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1 |
| Limnephilidae |
Northern Casemaker Caddisfly
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1 |
| Leptophlebiidae |
Pronggilled Mayfly
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1 |
| Ferrissia |
Small Air-Breathing Freshwater Limpets
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1 |
| Prostoia |
Spring Stonefly
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1 |
| Polycentropus |
Tube Maker Caddisfly
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1 |
| Hydrobius |
Water Scavenger Beetle
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1 |
| Paraphaenocladius |
Non-Biting Midges
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1 |
| Polypedilum |
Non-Biting Midges
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1 |
| Stempellinella |
Non-Biting Midges
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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.
