MBSS Site Summary for: ANAC-225-R-2017

Site Photos

Field photo showing stream conditions at site ANAC-225-R-2017-MidpointDownstream (Opens in a new window) Field photo showing stream conditions at site ANAC-225-R-2017-MidpointUpstream (Opens in a new window)

Located on Bachelors Run in the Anacostia River watershed, 8-digit code: 02140205.
This stream was visited in the spring on 3/9/2017 and again in the summer on 8/16/2017.

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 Fair - 3.3 / 5.0
Benthic IBI Poor - 2.7 / 5.0

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.)
Catchment area 2,198 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 34.1 %
Agricultural Land Use 19 %
Forested Land Use 42.1 %


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

Physical Stream Habitat
Instream Habitat 7/20 (Marginal)
Epifaunal Substrate 7/20 (Marginal)
Velocity/Depth Diversity 12/20 (Suboptimal)
Pool Quality
Pool Extent = 53 meters 		11/20 (Suboptimal)
Riffle Quality
Riffle Extent = 25 meters 		10/20 (Marginal)
Shading 25 %
Embeddedness 70 %
The embeddedness, a measure of silt on the stream bottom, was 70%. This is relatively high, and may exclude some biota.


Stream Water Quality:
pH (lab) 7.69
Alkalinity
(acid neutralizing capacity) 		1248.3 µeq/L
Dissolved organic carbon (DOC) 1.7526 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 19 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 1243
Bluntnose Minnow 412
Fantail Darter 357
Silverjaw Minnow 165
Longnose Dace 76
White Sucker 56
Rosyside Dace 44
Creek Chub 32
Cutlip Minnow 26
Tessellated Darter 23
Redbreast Sunfish 18
Swallowtail Shiner 14
Largemouth Bass 9
Margined Madtom 9
Common Shiner 6
Bluegill 5
Northern Hogsucker 5
Green Sunfish 1
Spotfin Shiner 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Northern Green Frog
Wood Frog

Crayfish:
Orconectes virilis

Exotic Plants:
Japanese Knotweed
Japanese Stiltgrass
Mimosa
Multiflora Rose
Oriental Bittersweet
Porcelainberry
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
ORTHOCLADIUS Non-Biting Midges 32
CHEUMATOPSYCHE Net-Spinning Caddisfly 17
CHIMARRA Fingernet Caddisfly 15
HYDROPSYCHE Net-Spinning Caddisfly 11
PSEPHENUS Water Penny 6
ORTHOCLADIINAE Midge 5
RHEOCRICOTOPUS Non-Biting Midges 4
MICROTENDIPES Non-Biting Midges 3
THIENEMANNIMYIA GROUP Non-Biting Midges 2
HYDROBAENUS Midge 2
ANTOCHA Crane Fly 2
STENELMIS Beetle 2
DIAMESA Bloodworm 2
NEOPHYLAX Caddisfly 1
HYDROPSYCHIDAE Common Netspinner Caddisfly 1
PROSTOMA Freshwater Nemertean (Ribbon Worm) 1
CAECIDOTEA Isopod 1
MACCAFFERTIUM March Brown And Cahill Mayfly 1
DIPHETOR Mayfly 1
HYDROPTILIDAE Micro Caddisfly 1
CLINOCERA Aquatic Dance Fly 1
TANYTARSUS Non-Biting Midges 1
THIENEMANNIELLA Non-Biting Midges 1
TVETENIA Non-Biting Midges 1
ANAFROPTILUM Small Minnow Mayfly 1
DIAMESINAE Non-Biting Midges 1
LUMBRICULIDAE Worm 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.