MBSS Site Summary for: LOCK-320-R-2023

Site Photos

Field photo showing stream conditions at site LOCK-320-R-2023-Midpointlookingdownstreampost-restortion (Opens in a new window) Field photo showing stream conditions at site LOCK-320-R-2023-Midpointlookingupstreampost-restoration (Opens in a new window)

Located on TRED AVON RIVER in the Lower Choptank watershed, 8-digit code: 02130403.
This stream was visited in the spring on 3/1/2023 and again in the summer on 8/30/2023.

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 - 3.3 / 5.0
Benthic IBI Poor - 2.7 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area No data available A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 49.9 %
Agricultural Land Use 34.3 %
Forested Land Use 15.4 %


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

Physical Stream Habitat
Instream Habitat 13/20 (Suboptimal)
Epifaunal Substrate 12/20 (Suboptimal)
Velocity/Depth Diversity 8/20 (Marginal)
Pool Quality
Pool Extent = 75 meters 		11/20 (Suboptimal)
Riffle Quality
Riffle Extent = 0 meters 		0/20 (Poor)
Shading 10 %
Embeddedness 100 %
The embeddedness, a measure of silt on the stream bottom, was 100%. This is very high, and may adversely affect biotic communities.


Stream Water Quality:
Water temperature 24.8 ° C
Dissolved oxygen (DO) 8.34 mg/L
pH (lab) 7.74
Alkalinity
(acid neutralizing capacity) 		2043 µeq/L
Dissolved organic carbon (DOC) 4.755 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 17 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mosquitofish 595
Pumpkinseed 239
Mummichog 235
Banded Killifish 233
Green Sunfish 58
Redbreast Sunfish 49
American Eel 42
Bluegill 39
Inland Silverside 25
Eastern Mudminnow 22
Golden Shiner 15
Lepomis Hybrid 7
Spot 7
Largemouth Bass 3
Brown Bullhead 2
Northern Snakehead 1
Striped Bass 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Broad-Headed Skink
Eastern Garter Snake
Northern Green Frog

Crayfish:
Faxonius limosus
Procambarus clarkii

Exotic Plants:
Autumn Olive
Burning Bush
Callery/Bradford Pear
Japanese Honeysuckle
Japanese Stiltgrass
Mile-A-Minute
Multiflora Rose
Phragmites (Common Reed)
Porcelainberry
Shrub Honeysuckle
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
ORTHOCLADIUS Non-Biting Midges 12
CRICOTOPUS Non-Biting Midges 8
POLYPEDILUM Non-Biting Midges 5
TANYTARSUS Non-Biting Midges 5
PARATANYTARSUS Non-Biting Midges 4
CORYNONEURA Non-Biting Midges 3
THIENEMANNIELLA Non-Biting Midges 3
THIENEMANNIMYIA GROUP Non-Biting Midges 3
POTTHASTIA Non-Biting Midges 3
LUMBRICULIDAE Worm 2
NAIDIDAE Aquatic Worm 2
PROSIMULIUM Black Fly 2
HYDROBAENUS Midge 2
CHEUMATOPSYCHE Net-Spinning Caddisfly 2
ABLABESMYIA Non-Biting Midge 1
CONCHAPELOPIA Non-Biting Midges 1
CALOPTERYX Damselfly 1
CAECIDOTEA Isopod 1
GAMMARUS Amphipod 1
MICROPSECTRA Non-Biting Midges 1
NANOCLADIUS Non-Biting Midges 1
PHAENOPSECTRA Non-Biting Midges 1
PARAMETRIOCNEMUS Non-Biting Midges 1
RHEOCRICOTOPUS Non-Biting Midges 1
RHEOTANYTARSUS 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.