MBSS Site Summary for: GILB-108-R-2015


Located on GILBERT POND UT in the Gilbert Swamp watershed, 8-digit code: 02140107.
This stream was visited in the spring on 3/10/2015 and again in the summer on 6/15/2015.

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 Poor - 2.7 / 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 30 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0.7 %
Agricultural Land Use 40.7 %
Forested Land Use 58.5 %


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

Physical Stream Habitat
Instream Habitat 9/20 (Marginal)
Epifaunal Substrate 15/20 (Suboptimal)
Velocity/Depth Diversity 4/20 (Poor)
Pool Quality
Pool Extent = 44 meters 		6/20 (Marginal)
Riffle Quality
Riffle Extent = 32 meters 		4/20 (Poor)
Shading 95 %
Embeddedness 80 %
The embeddedness, a measure of silt on the stream bottom, was 80%. This is relatively high, and may exclude some biota.


Stream Water Quality:
pH (lab) 5.95
Alkalinity
(acid neutralizing capacity) 		69.98 µeq/L
Dissolved organic carbon (DOC) 8.7269 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 4 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 85
Blacknose Dace 19
Least Brook Lamprey 12
Largemouth Bass 3
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog

Crayfish:
Cambarus diogenes

Exotic Plants:
Mimosa
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Stegopterna Black Fly 29
Parametriocnemus Non-Biting Midges 28
Pseudolimnophila Crane Fly 12
Synurella Amphipod 11
Caecidotea Isopod 6
Phaenopsectra Non-Biting Midges 5
Thienemannimyia Group Non-Biting Midges 5
Prosimulium Black Fly 4
Paraphaenocladius Non-Biting Midges 3
Diplectrona Net-Spinning Caddisfly 3
Anchytarsus Beetle 2
Erioptera Cranefly 2
Chrysops Deerfly 2
Tanypodinae Non-Biting Midges 2
Ironoquia Northern Caddisfly 2
Limnephilidae Northern Casemaker Caddisfly 2
Pisidiidae Pill Clam 1
Zavrelimyia Non-Biting Midges 1
Thienemanniella Non-Biting Midges 1
Chimarra Fingernet Caddisfly 1
Dicranota Hairy-Eyed Cranefly 1
Stenelmis Beetle 1
Ceratopogonidae Biting Midge 1
Tubificidae Aquatic Worm 1
Parachaetocladius Non-Biting Midge 1
Corynoneura Non-Biting Midges 1
Micropsectra Non-Biting Midges 1
Lype Net Tube Caddisfly 1
Phylocentropus 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.