MBSS Site Summary for: PTOB-108-X-2005


Located on Hoghole Run in the Port Tobacco River watershed, 8-digit code: 02140109.
This stream was visited in the spring on 9/20/2005 and again in the summer on 9/20/2005.

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 N R
Benthic IBI Good - 4.1 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 461 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 7 %
Agricultural Land Use 22 %
Forested Land Use 68 %


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

Physical Stream Habitat
Instream Habitat 3/20 (Poor)
Epifaunal Substrate 4/20 (Poor)
Velocity/Depth Diversity 6/20 (Marginal)
Pool Quality
Pool Extent = 11 meters 		11/20 (Suboptimal)
Riffle Quality
Riffle Extent = 0 meters 		0/20 (Poor)
Shading 86 %
Embeddedness 40 %
Several measures of instream habitat were considered 'Poor' at this location.


Stream Water Quality:
Water temperature 22 ° C
Dissolved oxygen (DO) 1.9 mg/L
Dissolved oxygen levels measured in the stream were very low (1.9 mg/L). Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
Conductivity 73 µmho/cm

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:
Fish data is unavailable or no fish observed.

Amphibians and Reptiles:
Northern Green Frog

Crayfish:
Cambaridae

Exotic Plants:
Japanese Honeysuckle
Japanese Stiltgrass
Mile-A-Minute
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Orthocladius Non-Biting Midges 24
Crangonyctidae Scud 16
Tanytarsus Non-Biting Midges 15
Leuctra  Rolled-Winged Stonefly 15
Polypedilum Non-Biting Midges 9
Amphinemura Spring Stonefly 4
Calopteryx Damselfly 4
Thienemannimyia Non-Biting Midges 4
Parametriocnemus Non-Biting Midges 3
Eurylophella Mayfly 2
Paratendipes European Non-Biting Midge 2
Gomphidae Clubtail Dragonfly 2
Microtendipes Non-Biting Midges 2
Lumbriculidae Worm 1
Eccoptura Yellow Stone Stonefly 1
Pseudolimnophila Crane Fly 1
Caecidotea Isopod 1
Synurella Amphipod 1
Stenelmis Beetle 1
Ceratopogonidae Biting Midge 1
Simulium Black Fly 1
Psilotreta Mortarjoint Casemaker Caddisfly 1
Labrundinia Non-Biting Midges 1
Zavrelimyia Non-Biting Midges 1
Ironoquia Northern Caddisfly 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.