Module 4 Stream Invertebrate Survey Interpretation
Upper Toquaht River, May 30, 2022 | Survey ID: 254
A) ABUNDANCE AND DENSITY
ABUNDANCE total number of organisms from Column B: 72
DENSITY invertebrate density per square meter
# of 30cm x 30cm samples: 3
(total # counted 72) / (# of 30cm x 30cm samples x.09m2 3 / (Area: 0.27)) : 266.67
DENSITY invertebrate density per square meter
# of 30cm x 30cm samples: 3
(total # counted 72) / (# of 30cm x 30cm samples x.09m2 3 / (Area: 0.27)) : 266.67
B) PREDOMINANT TAXON: Mayfly, (64)
C) WATER QUALITY ASSESSMENTS
POLLUTION TOLERANT INDEX | |||
Good | Acceptable | Marginal | Poor |
greater than 22 | 22 - 17 | 17 -11 | less than 11 |
3 x (# of category 1) = 0
2 x (# of category 2) = 0
(# of category 3) = 1
Pollution Tolerant Index = 1
2 x (# of category 2) = 0
(# of category 3) = 1
Pollution Tolerant Index = 1
EPT INDEX | |||
Good | Acceptable | Marginal | Poor |
greater than 8 | 5 - 8 | 2 - 5 | 0 - 2 |
Total number of EPT taxa from Column C = 0
EPT TO TOTAL RATIO | |||
Good | Acceptable | Marginal | Poor |
0.75 - 1.00 | 0.50 - 0.75 | 0.25 - 0.50 | 0 - 0.25 |
# of EPT 68 / total 72 = 0.94
D) DIVERSITY ASSESSMENT
Total Number of Taxa: 1
PREDOMINANT TAXON RATIO | |||
Good | Acceptable | Marginal | Poor |
0 - 0.40 | 0.40 - 0.60 | 0.60 - 0.80 | 0.80 - 1.0 |
PREDOMINANT TAXON RATIO:
64 / 72 = 0.8889
64 / 72 = 0.8889
SITE ASSESMENT RATING | |||
Good | Acceptable | Marginal | Poor |
4 | 3 | 2 | 1 |
Pollution Tolerance Index: | 1 |
EPT Index: | 1 |
EPT to Total Ratio: | 4 |
Predominant Taxon Ratio: | 1 |
Total: | 1.75 |
Field Data as Collected
Polution Tolerance |
Number Counted | Number of Taxa | Common Name |
Category 1 - Polution Intolerant | 0 | 0 | Caddisfly |
0 | 0 | Dobsonfly | |
0 | 0 | Gilled Snail | |
64 | 0 | Mayfly | |
0 | 0 | Riffle Beetle | |
4 | 0 | Stonefly | |
0 | 0 | Water Penny | |
Sub Total: | 68 | 0 | |
Category 2 - Somewhat Pollution Tolerant | 0 | 0 | Alderfly larva |
0 | 0 | Aquatic Beetle | |
0 | 0 | Aquatic Sowbug | |
0 | 0 | Clam, Mussel | |
0 | 0 | Cranefly Larva | |
0 | 0 | Crayfish | |
0 | 0 | Damselfy Larva | |
0 | 0 | Dragonfly Larva | |
0 | 0 | Fishfly Larva | |
0 | 0 | Scud | |
0 | 0 | Watersnipe Larva | |
Sub Total: | 0 | 0 | |
Category 3 - Pollution Tolerant | 2 | 0 | Aquatic Worm |
1 | 1 | Blackfly Larva | |
0 | 0 | Leech | |
0 | 0 | Midge Larva (chironomid) | |
1 | 0 | Planarian | |
0 | 0 | Pouch Snail | |
0 | 0 | Truebug Adult | |
0 | 0 | Water Mite | |
Sub Total: | 4 | 1 | |
Category 1 - Polution Intolerant | 0 | 0 | Caddisfly |
0 | 0 | Dobsonfly | |
0 | 0 | Gilled Snail | |
64 | 0 | Mayfly | |
0 | 0 | Riffle Beetle | |
4 | 0 | Stonefly | |
0 | 0 | Water Penny | |
Sub Total: | 68 | 0 | |
Category 2 - Somewhat Pollution Tolerant | 0 | 0 | Alderfly larva |
0 | 0 | Aquatic Beetle | |
0 | 0 | Aquatic Sowbug | |
0 | 0 | Clam, Mussel | |
0 | 0 | Cranefly Larva | |
0 | 0 | Crayfish | |
0 | 0 | Damselfy Larva | |
0 | 0 | Dragonfly Larva | |
0 | 0 | Fishfly Larva | |
0 | 0 | Scud | |
0 | 0 | Watersnipe Larva | |
Sub Total: | 0 | 0 | |
Category 3 - Pollution Tolerant | 2 | 0 | Aquatic Worm |
1 | 1 | Blackfly Larva | |
0 | 0 | Leech | |
0 | 0 | Midge Larva (chironomid) | |
1 | 0 | Planarian | |
0 | 0 | Pouch Snail | |
0 | 0 | Truebug Adult | |
0 | 0 | Water Mite | |
Sub Total: | 4 | 1 |