MBSS Site Summary for: BA-P-121-111-96


Located on DELAWARE RUN in the Loch Raven Reservoir watershed, 8-digit code: 02130805.
This stream was visited in the spring on 4/4/1996 and again in the summer on 7/8/1996.

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 - 2.7 / 5.0
Benthic IBI Good - 5.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 273 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 11 %
Agricultural Land Use 10.3 %
Forested Land Use 78.4 %


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

Physical Stream Habitat
Instream Habitat 11/20 (Suboptimal)
Epifaunal Substrate 7/20 (Marginal)
Velocity/Depth Diversity 8/20 (Marginal)
Pool Quality
Pool Extent = meters 		8/20 (Marginal)
Riffle Quality 9/20 (Marginal)
Shading 90 %
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:
Water temperature 17.9 ° C
Dissolved oxygen (DO) 11.2 mg/L
pH (lab) 7.52
Conductivity 249 µmho/cm
Alkalinity
(acid neutralizing capacity) 		1086 µeq/L
Dissolved organic carbon (DOC) 1.7 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 5 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 25
Brown Trout 14
Creek Chub 10
Longnose Dace 2
Rosyside Dace 2
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Dusky Salamander
Northern Green Frog

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Amphinemura Spring Stonefly 33
Ephemerella Sulphur Mayfly 19
Stenonema Flatheaded Mayfly 8
Diplectrona Net-Spinning Caddisfly 7
Cheumatopsyche Net-Spinning Caddisfly 3
Stegopterna Black Fly 3
Orthocladius Non-Biting Midges 3
Diploperla 3
Neophylax Caddisfly 3
Ameletus Combmouthed Minnow Mayfly 2
Diamesa Bloodworm 2
Baetis Blue-Winged Olive Mayfly 2
Rhyacophila Free-Living Caddisfly 2
Serratella Mayfly 1
Polypedilum Non-Biting Midges 1
Thienemannimyia Non-Biting Midges 1
Optioservus Riffle Beetle 1
Oulimnius Riffle Beetle 1
Paracapnia Small Winter Stonefly 1
Pseudolimnophila Crane Fly 1
Tipula Crane Fly 1
Tipulidae Cranefly 1
Helius 1
Clinocera Aquatic Dance Fly 1
Stenelmis Beetle 1
Prosimulium Black Fly 1
Hydropsyche Net-Spinning Caddisfly 1
Prostoia Spring Stonefly 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.