Stream Invertebrate Survey
Streamkeepers Handbook and Modules Module 4
Stream Location and Conditions
Stream Name/Nearest Town: Gravel Creek/Horsefly | Date: August 30, 2001 |
Watershed Code: |
Organization Name:The Pacific Streamkeepers Federation | Steam Segment # |
Stream Section # |
Contact Person: Zo Ann Morten |
Phone # 604-986-5059 |
Sampler used, mesh size, total area sampled: serber, 363 microns, .092 metres | # of 30cm x 30cm samples: 1 |
Survey Location
20m upstream of culvert under highway from 150 Mile House to Horsefly.
Time: 12:00 pm | Weather: | clear |
Turbidity: greater than depth | Temperature: | Air: 14.50 Water: 140 |
Invertebrate Survey Field Data
COLUMN A |
COLUMN B |
COLUMN C |
COLUMN D |
Pollution Tolerance |
Number Counted |
Number of Taxa |
Common Name |
CATEGORY 1
(pollution intolerant) |
58 |
5 | Caddisfly Larva (EPT) |
0 |
0 | Dobsonfly (hellgrammite) |
0 |
0 | Gilled Snail |
303 |
7 | Mayfly Nymph (EPT) |
4 |
2 | Riffle Beetle |
8 |
2 | Stonefly Nymph (EPT) |
0 |
0 | Water Penny |
Subtotal |
373 |
16 |
Subtotal |
CATEGORY 2
(somewhat tolerant of pollution) |
0 |
0 | Alderfly Larve |
0 |
0 | Aquatic Beetle |
0 |
0 | Aquatic Sowbug |
0 |
0 | Clam, Mussel |
1 |
1 | Cranefly Larva |
0 |
0 | Crayfish |
0 |
0 | Damselfly Larva |
0 |
0 | Dragonfly Larva |
0 |
0 | Fishfly Larva |
0 |
0 | Scud |
0 |
0 | Watersnipe Larva |
Subtotal |
1 |
1 |
Subtotal |
CATEGORY 3
(pollution tolerant) |
0 |
0 | Aquatic Worm |
15 |
1 | Blackfly Larva |
0 |
0 | Leech |
3 |
1 | Midge Larva (chironomid) |
1 |
1 | Planarian |
0 |
0 | Pouch and Pond Snails |
0 |
0 | True Bug Adult |
0 |
0 | Water Mite |
Subtotal |
19 |
3 |
Subtotal |
TOTAL |
393 |
20 | TOTAL |
Invertebrate Survey Interpretation
A) Abundance and Density
From page 27 of Module 4 Invertebrate Survey in the Streamkeepers handbook and Modules
Abundance: 393 |
Density: 4366.66 |
B) Predominant Taxon: Mayfly
C) Water Quality Assessments:
Pollution Tolerant Index |
Good |
Acceptable |
Marginal |
Poor |
>22 |
22-17 |
16-11 |
greater than 11 |
|
Pollution Tolerance Index:
17 (acceptable) |
EPT Index |
Good |
Acceptable |
Marginal |
Poor |
>8 |
5-8 |
2-5 |
0-1 |
|
EPT Index:
14 (good) |
EPT to Total Ratio |
Good |
Acceptable |
Marginal |
Poor |
0.75 - 1.00 |
0.50 - 0.75 |
0.25 - 0.50 |
0 - 0.25 |
|
EPT to Total Ratio:
.93 (good) |
D) Diversity Assessments:
Total Number of Taxa: 20 |
Predominant Taxon Ratio |
Good |
Acceptable |
Marginal |
Poor |
0 - .40 |
0.40 - 0.60 |
0.60 - 0.80 |
0.80 - 1.0 |
|
Predominant Taxon Ratio:
.77 (marginal) |
E) Site Assessment Rating:
Site Assessment Rating |
Good |
Acceptable |
Marginal |
Poor |
0.75 - 1.00 |
0.50 - 0.75 |
0.25 - 0.50 |
0 - 0.25 |
|
Site Assement Rating |
Index or Ratio |
Rating |
Pollution Tolerance Index |
3 |
EPT Index |
4 |
EPT to Total Ratio |
4 |
Predominant Taxon Ratio |
2 |
Total |
13 |
Average |
3.25
(acceptable) |
|
General Comments - Unknown Bugs Most of the caddis had rock homes, stuck to the rocks. Creek runs through forested area near road. Stonefly casings found nearby.
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This page courtesy of The Pacific Streamkeepers Federation October 01, 2001
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