MBSS Site Summary for: ZEKI-211-A-2007
Located on Kerrick Swamp in the Zekiah Swamp watershed,
8-digit code: 02140108.
This stream was visited in the spring on 3/28/2007 and again in the summer on 7/16/2007.
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 - 3.7 / 5.0
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Benthic IBI
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Good - 5.0 / 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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8,172 acres
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An example of a forested stream.
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Urban Land Use
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12.6 %
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Agricultural Land Use
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22 %
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Forested Land Use
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62 %
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Stream Water Quality:
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| Water temperature |
22.9 ° C
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| Dissolved oxygen (DO) |
4.9 mg/L
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Dissolved oxygen levels measured in the stream were very low (4.9 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.82 |
| Conductivity |
141 µmho/cm
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Alkalinity
(acid neutralizing capacity)
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159.8 µeq/L |
| Dissolved organic carbon (DOC) |
3.9962 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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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Ephemerella |
Sulphur Mayfly
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20 |
| Rheosmittia |
Non-Biting Midges
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10 |
| Stenelmis |
Beetle
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8 |
| Stenonema |
Flatheaded Mayfly
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5 |
| Oulimnius |
Riffle Beetle
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5 |
| Dubiraphia |
Riffle Beetle
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4 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
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4 |
| Cheumatopsyche |
Net-Spinning Caddisfly
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4 |
| Labrundinia |
Non-Biting Midges
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4 |
| Orthocladius |
Non-Biting Midges
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3 |
| Neophylax |
Caddisfly
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3 |
| Orthocladiinae |
Midge
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3 |
| Chloroperlidae |
Green Stonefly
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3 |
| Stempellinella |
Non-Biting Midges
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3 |
| Polypedilum |
Non-Biting Midges
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2 |
| Amphinemura |
Spring Stonefly
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2 |
| Prostoia |
Spring Stonefly
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2 |
| Isoperla |
Stripetail Stonefly
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2 |
| Caecidotea |
Isopod
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2 |
| Leptoceridae |
Longhorned Casemaker Caddisfly
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2 |
| Musculium |
Fingernail Clam
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2 |
| Simuliidae |
Black Fly
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1 |
| Basiaeschna |
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1 |
| Leuctra |
Rolled-Winged Stonefly
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1 |
| Aeshna |
Mosaic Darner Dragonflies
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1 |
| Calopteryx |
Damselfly
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1 |
| Parametriocnemus |
Non-Biting Midges
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1 |
| Paratanytarsus |
Non-Biting Midges
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1 |
| Lumbriculidae |
Worm
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1 |
| Optioservus |
Riffle Beetle
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1 |
| Ancyronyx |
Spider Riffle Beetle
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1 |
| Rheocricotopus |
Non-Biting Midges
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1 |
| Ablabesmyia |
Non-Biting Midge
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1 |
| Tanytarsus |
Non-Biting Midges
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1 |
| Trissopelopia |
Non-Biting Midges
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1 |
| Zavrelimyia |
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.
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