MBSS Site Summary for: TA-N-011-106-97


Located on EASTERN BR BOLINGBROKE CR in the Lower Choptank watershed, 8-digit code: 02130403.
This stream was visited in the spring on 3/13/1997 and again in the summer on 6/6/1997.

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.
Fish IBI Poor - 1.7 / 5.0
Benthic IBI Poor - 2.4 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 367 acres Cows standing in a stream at a site with high agricultural land use. Cows survey the sampling procedure at this extreme example of a highly agriculturalized site.
Urban Land Use 0.4 %
Agricultural Land Use 79.2 %
Forested Land Use 18.3 %


Stream showing woody debris, logs, and rocky substrate.
An example of woody debris in a stream.

Physical Stream Habitat
Instream Habitat 5/20 (Poor)
Epifaunal Substrate 5/20 (Poor)
Velocity/Depth Diversity 6/20 (Marginal)
Pool Quality
Pool Extent = meters 		7/20 (Marginal)
Riffle Quality 7/20 (Marginal)
Shading 85 %
Embeddedness 80 %
The embeddedness, a measure of silt on the stream bottom, was 80%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 13.7 ° C
Dissolved oxygen (DO) 8.2 mg/L
pH (lab) 6.52
Conductivity 155 µmho/cm
Alkalinity
(acid neutralizing capacity) 		217.2 µeq/L
Dissolved organic carbon (DOC) 5.3 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. 		Close-up of a mayfly indicator species.

Fish Survey Results:
The following 3 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 82
Bluegill 3
Golden Shiner 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Prosimulium Black Fly 21
Parametriocnemus Non-Biting Midges 18
Stegopterna Black Fly 15
Prostoia Spring Stonefly 15
Rheocricotopus Non-Biting Midges 12
Limnephilidae Northern Casemaker Caddisfly 5
Thienemannimyia Non-Biting Midges 3
Chrysops Deerfly 3
Caecidotea Isopod 1
Diplocladius Non-Biting Midges 1
Paraphaenocladius Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Gerris 1
Naididae Aquatic Worm 1
Zavrelimyia Non-Biting Midges 1
Collembola Springtail 1
Kick net sampling for macroinvertebrates.
Sampling with a kick net.

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.