MBSS Site Summary for: CH-S-100-108-95


Located on HILL TOP FORK NANJEMOY UT1 in the Nanjemoy Creek watershed, 8-digit code: 02140110.
This stream was visited in the spring on 3/2/1995 and again in the summer on 5/31/1995.

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 - 2.3 / 5.0
Benthic IBI Good - 4.7 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 226 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0 %
Agricultural Land Use 3.5 %
Forested Land Use 26.8 %


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

Physical Stream Habitat
Instream Habitat 6/20 (Marginal)
Epifaunal Substrate 9/20 (Marginal)
Velocity/Depth Diversity 6/20 (Marginal)
Pool Quality
Pool Extent = meters 		5/20 (Poor)
Riffle Quality 7/20 (Marginal)
Shading 92 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 17.9 ° C
Dissolved oxygen (DO) 7.8 mg/L
pH (lab) 6.52
Conductivity 78 µmho/cm
Alkalinity
(acid neutralizing capacity) 		132 µeq/L
Dissolved organic carbon (DOC) 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 5 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 105
Rosyside Dace 60
Eastern Mudminnow 30
Creek Chub 20
American Eel 3
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Eastern Cricket Frog
Fowler's Toad
Northern Green Frog
Northern Red Salamander
Northern Two-Lined Salamander
Pickerel 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
Acerpenna Tiny Blue-Winged Olive Mayflies 17
Stegopterna Black Fly 13
Parametriocnemus Non-Biting Midges 8
Thienemanniella Non-Biting Midges 6
Cricotopus Non-Biting Midges 6
Heleniella European Non-Biting Midge 5
Paraleptophlebia Blue Quill Mayfly 4
Leuctra  Rolled-Winged Stonefly 3
Psilotreta Mortarjoint Casemaker Caddisfly 3
Unniella Non-Biting Midge 3
Corynoneura Non-Biting Midges 3
Tipula Crane Fly 3
Sweltsa Stonefly 2
Microtendipes Non-Biting Midges 2
Amphinemura Spring Stonefly 2
Stenonema Flatheaded Mayfly 2
Probezzia Biting Midges 2
Prosimulium Black Fly 2
Hexatoma Crane Fly 2
Pseudolimnophila Crane Fly 1
Crangonyx Amphipod 1
Bezzia Biting Midge 1
Eurylophella Mayfly 1
Nigronia Megaloptera (Dark Fishfly) 1
Diplectrona Net-Spinning Caddisfly 1
Prostoia Spring Stonefly 1
Thienemannimyia Non-Biting Midges 1
Leptophlebia Pronggilled Mayfly 1
Paracapnia Small Winter Stonefly 1
Eccoptura Yellow Stone Stonefly 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.