Module 4 Stream Invertebrate Survey Interpretation
MAPLE CREEK | Survey ID: 244
A) Abundance and density
ABUNDANCE: 176 / NUMBER OF SAMPLES: (1 *.09) = DENSITY: 1,955.56
B) PREDOMINANT TAXON
Mayfly Larva
C) WATER QUALITY ASSESSMENTS
POLLUTION TOLERANT INDEX
Good
Acceptable
Marginal
Poor
greater than 22
22 - 17
16 - 11
less than 11
3 x (# of category 1) = 42
2 x (# of category 2) = 44
(# of category 3) = 16
= 102
EPT INDEX
Good
Acceptable
Marginal
Poor
greater than 8
5 - 8
2 - 5
0 - 1
Total number of EPT taxa from Column C = 4
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
118 / total
176 =
0.67
D) DIVERSITY ASSESSMENT
TOTAL NUMBER OF TAXA: 12
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: Predominant Taxa 81 / 176 = 0.4602
SITE ASSESMENT RATING
Good
Acceptable
Marginal
Poor
4
3
2
1
Pollution Tolerance Index: 4
EPT Index: 2
EPT to Total Ratio: 3
Predominant Taxon Ratio: 3
Total: 3
POLLUTION TOLERANT INDEX | |||
---|---|---|---|
Good | Acceptable | Marginal | Poor |
greater than 22 | 22 - 17 | 16 - 11 | less than 11 |
3 x (# of category 1) = 42
2 x (# of category 2) = 44
(# of category 3) = 16
= 102
2 x (# of category 2) = 44
(# of category 3) = 16
= 102
EPT INDEX | |||
---|---|---|---|
Good | Acceptable | Marginal | Poor |
greater than 8 | 5 - 8 | 2 - 5 | 0 - 1 |
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
118 / total
176 =
0.67
PREDOMINANT TAXON RATIO | |||
---|---|---|---|
Good | Acceptable | Marginal | Poor |
0 - 0.40 | 0.40 - 0.60 | 0.60 - 0.80 | 0.80 - 1.0 |
SITE ASSESMENT RATING | |||
---|---|---|---|
Good | Acceptable | Marginal | Poor |
4 | 3 | 2 | 1 |
Pollution Tolerance Index: 4
EPT Index: 2
EPT to Total Ratio: 3
Predominant Taxon Ratio: 3
Total: 3
EPT Index: 2
EPT to Total Ratio: 3
Predominant Taxon Ratio: 3
Total: 3
Field Data as Collected
Polution Tolerance |
Number Counted | Number of Taxa | Common Name |
Category 1 - Polution Intolerant | 37 | 1 | Caddisfly |
0 | 0 | Dobsonfly | |
0 | 0 | Gilled Snail | |
81 | 3 | Mayfly | |
0 | 0 | Riffle Beetle | |
0 | 0 | Stonefly | |
0 | 0 | Water Penny | |
Sub Total: | 118 | 4 | 14 |
Category 2 - Somewhat Pollution Tolerant | 0 | 0 | Alderfly larva |
0 | 0 | Aquatic Beetle | |
2 | 1 | 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 | |
35 | 1 | Scud | |
0 | 0 | Watersnipe Larva | |
Sub Total: | 37 | 2 | 22 |
Category 3 - Pollution Tolerant | 15 | 4 | Aquatic Worm |
0 | 0 | Blackfly Larva | |
0 | 0 | Leech | |
0 | 0 | Midge Larva (chironomid) | |
3 | 1 | Planarian | |
0 | 0 | Pouch Snail | |
0 | 0 | Truebug Adult | |
3 | 1 | Water Mite | |
Sub Total: | 21 | 6 | 16 |
Total: | 176 | 12 | 52 |