MBSS Site Summary for: ANAC-117-R-2004

Site Photos

Field photo showing stream conditions at site ANAC-117-R-2004-22 (Opens in a new window) Field photo showing stream conditions at site ANAC-117-R-2004-23 (Opens in a new window)

Located on INDIAN CR in the Anacostia River watershed, 8-digit code: 02140205.
This stream was visited in the spring on 3/3/2004 and again in the summer on 6/7/2004.

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 Poor - 2.4 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 807 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 38 %
Agricultural Land Use 43 %
Forested Land Use 11 %


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

Physical Stream Habitat
Instream Habitat 13/20 (Suboptimal)
Epifaunal Substrate 7/20 (Marginal)
Velocity/Depth Diversity 12/20 (Suboptimal)
Pool Quality
Pool Extent = 50 meters 		12/20 (Suboptimal)
Riffle Quality
Riffle Extent = 33 meters 		11/20 (Suboptimal)
Shading 96 %
Embeddedness 95 %
The embeddedness, a measure of silt on the stream bottom, was 95%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 18 ° C
Dissolved oxygen (DO) 8.6 mg/L
pH (lab) 7.08
Conductivity 314 µmho/cm
Alkalinity
(acid neutralizing capacity) 		1464 µeq/L
Dissolved organic carbon (DOC) 2.7 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 4 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 104
Creek Chub 31
Rosyside Dace 23
American Eel 6
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog
Northern Spring Peeper
Northern Two-Lined Salamander
Pickerel Frog
Wood Frog

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Honeysuckle
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Leuctra  Rolled-Winged Stonefly 40
Thienemannimyia group Non-Biting Midges 39
Parametriocnemus Non-Biting Midges 25
Sialis Alderfly 12
Diplocladius Non-Biting Midges 6
Paratanytarsus Non-Biting Midges 3
Polycentropus Tube Maker Caddisfly 3
Crangonyx Amphipod 2
Anchytarsus Beetle 2
Tipula Crane Fly 1
Isotomurus Elongate-Bodied Springtail 1
Nigronia Megaloptera (Dark Fishfly) 1
Orthocladiinae Midge 1
Tanytarsini Non-Biting Midges 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.