BMI Event at Virgil Creek - Virgil Creek Rd on 07/29/2021
Description upstream of Virgil Creek Rd Rationale
Details
Latitude, Longitude
42.47954087, -76.23870861
Miles from stream mouth
Date of sample
07-29-2021
Squares Replicate 1
2 / 12
Conducted Sampling
Anne Culp, Emerald Colgan, Eloise Leeming, Adrianna Hirtler
Conducted Analysis
Bethany Holland, Gail Blake, Anne Culp, Adrianna Hirtler
Impact Assessment Based on NYSDEC model and 100 organism count
Biological Assessment Profile 6.9
Total Family Richness 14.0
Family EPT Richness 7.0
Family Biotic Index 5.16
Percent Model Affinity 55
Percent Contribution of Dominant Family 35% Hydropsychidae
Sample Analysis Preserved
Organism Count and Metrics Calculations
R1
Organism Density = Total Number of Organisms in Sample 5688
Number of organisms counted 948

Actual Count

R1
Organism Density = Total Number of Organisms in Sample 5688
EPT Richness 12.0
Total Family Richness 27.0
Biotic Index 5.11
Dominant Family Hydropsychidae
Percent Contribution of Dominant Family 30
Percent Model Affinity 55
Percent Similarity Between Replicates 0
Biological Assessment Profile
Replicate 1
Families in Major Groups T D T x D %C L
Ephemeroptera
Baetidae 6 38 228 4.0
Baetiscidae 4
Caenidae 6 8 48 0.8
Ephemerellidae 2
Heptageniidae 3 11 33 1.2
Isonychiidae 2
Ephemeridae 4 1 4 0.1
Leptophlebliidae 4 2 8 0.2
Metretopodidae 2
Polymitarcyidae 2
Potomanthidae 4
Siphlonuridae* 4
Leptohyphidae (Tricorythldae) 4
Ameletidae 0
Sub-total 60 6
Plecoptera
Perlidae 3 1 3 0.1
Capniidae 3
Chloroperlidae 0
Leuctridae 0
Nemouridae 2
Peltoperlidae 0
Perlodidae 2
Pteronarcyidae 0
Taeniopterygidae 2
Undetermined Plecoptera 2
Sub-total 1 0
Megaloptera
Corydalidae 4 1 4 0.1
Sialidae 4 2 8 0.2
Sub-total 3 0
Lepidoptera
Pyralidae 5
Sub-total 0 0
Trichoptera
Hydropsychidae 5 290 1450 30.6
Hydroptilidae 6 23 138 2.4
Odontoceridae 0
Philopotamidae 3 33 99 3.5
Polycentropodidae 6 3 18 0.3
Rhyacophilidae 1
Undetermined Trichoptera 3
Brachycentridae 2
Glossosomatidae 1
Helicopsychidae 3 1 3 0.1
Lepidostomatidae 1
Leptoceridae 4
Limnephilidae 4
Molannidae 6
Phryganeidae 4
Psychomyiidae 2 2 4 0.2
Sericostomatidae 3
Uenoidae 3
Sub-total 352 37
Diptera
Athericidae 4 14 56 1.5
Ceratopgonidae 6 3 18 0.3
Tipulidae 4 39 156 4.1
Empididae 6 8 48 0.8
Undetermined Diptera 6
Blephariceridae 0
Simuliidae 5
Tabanidae 5 1 5 0.1
Stratiomyidae 7
Sub-total 65 7
Isopoda
Asellidae 8
Sub-total 0 0
Coleoptera
Elmidae 5 227 1135 23.9
Psephenidae 4 40 160 4.2
Dryopidae 5
Gyrinidae 4
Haliplidae 5
Undetermined Coleoptera 5 1 5 0.1
Dytiscidae 5
Sub-total 268 28
Odonata
Coenagrionidae 8
Aeshnidae 5
Calopterygidae 6
Cordulegastridae 3
Corduliidae 2
Gomphidae 4 9 36 0.9
Lestidae 9
Libellulidae 2
Macromiidae 2
Sub-total 9 1
Amphipoda
Crangonyctidae 6
Gammaridae 6
Talitridae 8
Sub-total 0 0
Decapoda
Cambaridae or Astacidae 6
Sub-total 0 0
Other
Turbellaria 6 1 6 0.1
Nemertea 8
Hirudinea 7
Gastropoda 7
Pelecypoda 6
Hydrachnidae 6
Nematoda 5 1 5 0.1
Sub-total 2 0
Oligochaeta
Oligochaeta 9 13 117 1.4
Sub-total 13 1
Chironomidae
Chironomidae 6 175 1050 18.5
Sub-total 175 18
Totals 948 100 0.0

100 Count is obtained by backing actual count down to 100 using statistics so that metrics calculations are consistent with NYSDEC model, which is based on counting 100 organisms in a sample

R1 R2 Avg
Organism Density = Total Number of Organisms in Sample
EPT Richness 7.0 7.0
Total Family Richness 14.0 14.0
Biotic Index 5.16 5.16
Dominant Family Hydropsychidae
Percent Contribution of Dominant Family 35 35
Percent Model Affinity 55 55
Percent Similarity Between Replicates 0 0
Biological Assessment Profile 6.9 6.9
Replicate 1 Replicate 2
Families in Major Groups T D T x D %C D T x D %C L
Ephemeroptera
Baetidae 6 2 12 2.0
Baetiscidae 4
Ephemerellidae 2
Heptageniidae 3
Isonychiidae 2
Ephemeridae 4
Leptophlebliidae 4 1 4 1.0
Metretopodidae 2
Polymitarcyidae 2
Potomanthidae 4
Siphlonuridae* 4
Ameletidae 0
Caenidae 6 1 6 1.0
Leptohyphidae (Tricorythldae) 4
Sub-total 4 0
Plecoptera
Perlidae 3
Capniidae 3
Chloroperlidae 0
Leuctridae 0
Nemouridae 2
Peltoperlidae 0
Perlodidae 2
Pteronarcyidae 0
Taeniopterygidae 2
Undetermined Plecoptera 2
Sub-total 0 0
Megaloptera
Corydalidae 4
Sialidae 4
Sub-total 0 0
Lepidoptera
Pyralidae 5
Sub-total 0 0
Trichoptera
Hydropsychidae 5 35 175 35.0
Hydroptilidae 6 1 6 1.0
Odontoceridae 0
Philopotamidae 3 2 6 2.0
Polycentropodidae 6 1 6 1.0
Rhyacophilidae 1
Brachycentridae 2
Glossosomatidae 1
Helicopsychidae 3
Lepidostomatidae 1
Leptoceridae 4
Limnephilidae 4
Molannidae 6
Phryganeidae 4
Psychomyiidae 2
Sericostomatidae 3
Uenoidae 3
Undetermined Trichoptera 3
Sub-total 39 0
Diptera
Athericidae 4 3 12 3.0
Ceratopgonidae 6 1 6 1.0
Tipulidae 4 6 24 6.0
Empididae 6
Blephariceridae 0
Simuliidae 5
Tabanidae 5
Stratiomyidae 7
Undetermined Diptera 6
Sub-total 10 0
Isopoda
Asellidae 8
Sub-total 0 0
Coleoptera
Elmidae 5 20 100 20.0
Psephenidae 4 3 12 3.0
Dryopidae 5
Gyrinidae 4
Haliplidae 5
Undetermined Coleoptera 5
Dytiscidae 5
Sub-total 23 0
Odonata
Coenagrionidae 8
Aeshnidae 5
Calopterygidae 6
Cordulegastridae 3
Corduliidae 2
Gomphidae 4
Lestidae 9
Libellulidae 2
Macromiidae 2
Sub-total 0 0
Amphipoda
Crangonyctidae 6
Gammaridae 6
Talitridae 8
Sub-total 0 0
Decapoda
Cambaridae or Astacidae 6
Sub-total 0 0
Other
Turbellaria 6
Nemertea 8
Hirudinea 7
Gastropoda 7
Pelecypoda 6
Nematoda 5
Hydrachnidae 6
Sub-total 0 0
Oligochaeta
Oligochaeta 9 1 9 1.0
Sub-total 1 0
Chironomidae
Chironomidae 6 23 138 23.0
Sub-total 23 0
Totals 100 100 0 0
Physical Survey
Physical Characteristics of Stream
Stream Size
Gradient
Water Level
Average stream width at sampling location 6.0 m
Average stream depth at sampling location 0.1 m
Upstream Dam within 1 km?
Recent Precipitation
Precipitation day of sampling
Precipitation previous two days
Water Appearance/Odor
Turbidity substantially greater than natural conditions?
Oily film, grease globules, or unusual odor or color present?
Algae or Weed Growth: Substantially greater than natural conditions?
Surrounding Land Use
Forest Cover
Agriculture
Human Habitation
Commercial/Industrial
Temperature
Air temperature, in degrees Centigrade 17
Water temperature, in degrees Centigrade 10
Habitat Assessment Factors
Assessment FactorExcellentGoodFairPoor
Riffle SizeWell-developed riffle, as wide as stream & as long as 2x stream widthRiffle as wide as stream but riffle length less than 2x stream widthRiffle not as wide as stream and length less than 2x stream widthRiffles or run virtually non-existent
Substrate size (at BMI collection site)Cobble predominates; boulders, gravel commonCobble less abundant; boulders and gravel commonGravel, boulders or bedrock prevalent; some cobbleLarge boulders and bedrock or sand & silt prevalent; cobble lacking
Shelter for fishSnags, submerged logs, undercut banks, or other stable habitat are found in over 50% of the siteSnags, submerged logs, undercut banks, or other stable habitat are found in 30-50% of the siteSnags, submerged logs, undercut banks, or other stable habitat are found in 10-30% of the siteSnags, submerged logs, undercut banks, or other stable habitat are found in less than 10% of the site
Embeddedness (at BMI collection site)Rocks in stream <25% embedded; very little sand, silt, or mudRocks 25-50% embedded; can easily turn over rocksRocks 50-75% embedded and firmly stuck in sedimentsRocks >75% embedded; bottom mostly sand, silt, or mud
Flow pattern (deep is > 2 ft)All 4 patterns present: slow/deep, fast/shallow, fast/deep, slow/shallowOnly 3 of 4 flow patterns presentOnly 2 of 4 flow patterns presentDominated by 1 flow pattern
Channel AlterationStream straightening, dredging, artificial embankments, dams or bridge abutments absent or minimal; stream with meandering patternSome stream straightening, dredging, artificial embankments or dams present, usually near bridge abutments; no recent channel alterationArtificial embankments present to some extent on both banks; and 40-80% of stream site straightened, dredged, or otherwise alteredBanks shored with gabion or cement; over 80% of the stream site straightened and disrupted
Stream bank cover and stability*Banks stable; no evidence of erosion; bank covered by vegetation or rockModerately stable; small areas of erosion; most of bank covered by vegetation or rockLargely unstable; almost half of bank has areas of erosion or is not covered by vegetation or rockUnstable, eroded; less than half of bank covered by egetation or rock, or rock slumping into creek
Disruption of riparian bank coverage* (land bordering stream bank)Mature trees and vegetation; most growing naturally; no disturbance by forestry, grazing, or mowingTrees, woody plants, soft green plants dominate; some disruption but not affecting full plant growth potentialObvious disruption; patches of bare soil, cultivated fields or closely cropped vegetation are the normNot much natural vegetation left or it has been removed to 3” in height
Width of riparian vegetation zone*More than 35 meters wide; human activities have not impacted zoneZone 12-35 yards wide; marginal impact from human activitiesZone 6-12 yards wide; impact from human activities evidentZone less than 6 yards wide; lots of nearby human activities
LitterNo litter (metal or plastic)Very little litter; accidentally droppedLitter fairly common; purposely droppedLots of litter present; obviously dumped

* Where the two banks were very different, the worst side was assessed.

Stream Bottom Survey
Silt/clay/mud
Sand
Gravel 47
Cobbles 53
Boulders
Bedrock
Predominant Cobble Embededness

0-25%