MBSS Site Summary for: GILB-101-R-2015


Located on LANCASTER RUN in the Gilbert Swamp watershed, 8-digit code: 02140107.
This stream was visited in the spring on 3/9/2015 and again in the summer on 6/9/2015.

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 - 3.7 / 5.0
Benthic IBI Good - 4.7 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 506 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 12.3 %
Agricultural Land Use 40.4 %
Forested Land Use 45.5 %


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

Physical Stream Habitat
Instream Habitat 16/20 (Optimal)
Epifaunal Substrate 16/20 (Optimal)
Velocity/Depth Diversity 13/20 (Suboptimal)
Pool Quality
Pool Extent = 48 meters 		15/20 (Suboptimal)
Riffle Quality
Riffle Extent = 27 meters 		10/20 (Marginal)
Shading 70 %
Embeddedness 75 %
The embeddedness, a measure of silt on the stream bottom, was 75%. This is relatively high, and may exclude some biota.


Stream Water Quality:
pH (lab) 6.85
Alkalinity
(acid neutralizing capacity) 		166.1 µeq/L
Dissolved organic carbon (DOC) 3.0023 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 6 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 340
Least Brook Lamprey 144
Eastern Mudminnow 39
American Eel 16
Bluegill 5
Green Sunfish 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Fowler's Toad
Northern Green Frog
Northern Two-Lined Salamander
Northern Water Snake
Southern Leopard Frog

Crayfish:
Cambarus diogenes

Exotic Plants:
Japanese Stiltgrass
Mimosa
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ephemerella Sulphur Mayfly 18
Prostoia Spring Stonefly 16
Prosimulium Black Fly 15
Acerpenna Tiny Blue-Winged Olive Mayflies 10
Orthocladius Non-Biting Midges 7
Oulimnius Riffle Beetle 6
Psephenus Water Penny 5
Stenelmis Beetle 5
Maccaffertium March Brown And Cahill Mayfly 3
Eurylophella Mayfly 3
Nemouridae Nemourid Stonefly 3
Neophylax Caddisfly 3
Hexatoma Crane Fly 2
Anchytarsus Beetle 2
Cheumatopsyche Net-Spinning Caddisfly 2
Lepidostoma Little Brown Sedge Caddisfly 2
Corynoneura Non-Biting Midges 2
Amphinemura Spring Stonefly 2
Sympotthastia Non-Biting Midges 2
Zavrelimyia Non-Biting Midges 1
Leptophlebia Pronggilled Mayfly 1
Parametriocnemus Non-Biting Midges 1
Paraphaenocladius Non-Biting Midges 1
Isoperla Stripetail Stonefly 1
Eccoptura Yellow Stone Stonefly 1
Diplectrona Net-Spinning Caddisfly 1
Psilotreta Mortarjoint Casemaker Caddisfly 1
Probezzia Biting Midges 1
Helichus Beetle 1
Diploperla 1
Molanna 1
Physa Air-Breathing Freshwater Snail 1
Chrysops Deerfly 1
Chloroperlidae Green 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.