MBSS Site Summary for: PTOB-118-R-2003

Site Photos

Located on WILLS BR in the Port Tobacco River watershed, 8-digit code: 02140109.
This stream was visited in the spring on 3/18/2003 and again in the summer on 7/8/2003.

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 - 1.0 / 5.0
Benthic IBI Fair - 3.6 / 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 140 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 1 %
Agricultural Land Use 36 %
Forested Land Use 61 %


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 15/20 (Suboptimal)
Velocity/Depth Diversity 8/20 (Marginal)
Pool Quality
Pool Extent = 37 meters 		6/20 (Marginal)
Riffle Quality
Riffle Extent = 38 meters 		6/20 (Marginal)
Shading 95 %
Embeddedness 15 %


Stream Water Quality:
Water temperature 18.9 ° C
Dissolved oxygen (DO) 7.8 mg/L
pH (lab) 5.45
Conductivity 77 µmho/cm
Alkalinity
(acid neutralizing capacity) 		18.8 µeq/L
Dissolved organic carbon (DOC) 2.3 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 1 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 3
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Eastern American Toad
Northern Copperhead
Northern Green Frog
Pickerel Frog

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Honeysuckle
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Leuctra  Rolled-Winged Stonefly 52
Caecidotea Isopod 14
Amphinemura Spring Stonefly 8
Leptophlebia Pronggilled Mayfly 3
Oulimnius Riffle Beetle 3
Diplocladius Non-Biting Midges 3
Tanypodinae Non-Biting Midges 3
Zavrelimyia Non-Biting Midges 2
Capniidae Small Winter Stonefly 2
Clioperla Green-Winged Stonefly 2
Molophilus 1
Dolophilodes Medium Evening Sedge Caddisfly 1
Corynoneura Non-Biting Midges 1
Synurella Amphipod 1
Stenelmis Beetle 1
Prosimulium Black Fly 1
Tipulidae Cranefly 1
Lumbriculidae Worm 1
Pisidiidae Pill Clam 1
Parametriocnemus 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.