MBSS Site Summary for: PAXM-122-R-2001

Site Photos

Field photo showing stream conditions at site PAXM-122-R-2001-125 (Opens in a new window) Field photo showing stream conditions at site PAXM-122-R-2001-126 (Opens in a new window)

Located on SWAN POINT CR UT1 in the Patuxent River middle watershed, 8-digit code: 02131102.
This stream was visited in the spring on 3/26/2001 and again in the summer on 6/5/2001.

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 Fair - 3.6 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 335 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 1 %
Agricultural Land Use 30 %
Forested Land Use 69 %


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

Physical Stream Habitat
Instream Habitat 14/20 (Suboptimal)
Epifaunal Substrate 12/20 (Suboptimal)
Velocity/Depth Diversity 11/20 (Suboptimal)
Pool Quality
Pool Extent = 25 meters 		11/20 (Suboptimal)
Riffle Quality
Riffle Extent = 55 meters 		10/20 (Marginal)
Shading 95 %
Embeddedness 40 %


Stream Water Quality:
Water temperature 15.6 ° C
Dissolved oxygen (DO) 9.1 mg/L
pH (lab) 6.6
Conductivity 190 µmho/cm
Alkalinity
(acid neutralizing capacity) 		224.8 µeq/L
Dissolved organic carbon (DOC) 2.2 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 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 125
Rosyside Dace 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Northern Green Frog
Northern Two-Lined Salamander

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Honeysuckle
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Amphinemura Spring Stonefly 34
Gammarus Amphipod 27
Parametriocnemus Non-Biting Midges 26
Polypedilum Non-Biting Midges 10
Cricotopus/Orthocladius Midge 4
Neophylax Caddisfly 3
Micropsectra Non-Biting Midges 3
Thienemannimyia group Non-Biting Midges 3
Ironoquia Northern Caddisfly 2
Orthocladius Non-Biting Midges 2
Rheocricotopus Non-Biting Midges 2
Clioperla Green-Winged Stonefly 2
Gordiidae Horsehair Worm 2
Chironomini Non-Biting Midge 1
Conchapelopia Non-Biting Midges 1
Ameletus Combmouthed Minnow Mayfly 1
Tipula Crane Fly 1
Chrysops Deerfly 1
Rhyacophila Free-Living Caddisfly 1
Perlodidae Perlodid Stonefly 1
Tvetenia Non-Biting Midges 1
Hemerodromia Tiny Fly 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.