Module 4 Stream Invertebrate Survey Interpretation
Byrne Creek, Feb 15, 2015 | Survey ID: 94
A) ABUNDANCE AND DENSITY
ABUNDANCE total number of organisms from Column B: 111
DENSITY invertebrate density per square meter
# of 30cm x 30cm samples: 3
(total # counted 111) / (# of 30cm x 30cm samples x.09m2 3 / (Area: 0.27)) : 411.11
DENSITY invertebrate density per square meter
# of 30cm x 30cm samples: 3
(total # counted 111) / (# of 30cm x 30cm samples x.09m2 3 / (Area: 0.27)) : 411.11
B) PREDOMINANT TAXON: Mayfly, (78)
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) = 3
2 x (# of category 2) = 2
(# of category 3) = 2
Pollution Tolerant Index = 7
2 x (# of category 2) = 2
(# of category 3) = 2
Pollution Tolerant Index = 7
EPT INDEX | |||
Good | Acceptable | Marginal | Poor |
greater than 8 | 5 - 8 | 2 - 5 | 0 - 2 |
Total number of EPT taxa from Column C = 2
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 78 / total 111 = 0.70
D) DIVERSITY ASSESSMENT
Total Number of Taxa: 6
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:
78 / 111 = 0.7027
78 / 111 = 0.7027
SITE ASSESMENT RATING | |||
Good | Acceptable | Marginal | Poor |
4 | 3 | 2 | 1 |
Pollution Tolerance Index: | 1 |
EPT Index: | 2 |
EPT to Total Ratio: | 3 |
Predominant Taxon Ratio: | 2 |
Total: | 2 |
Field Data as Collected
Polution Tolerance |
Number Counted | Number of Taxa | Common Name |
Category 1 - Polution Intolerant | Caddisfly | ||
Dobsonfly | |||
Gilled Snail | |||
78 | 2 | Mayfly | |
Riffle Beetle | |||
Stonefly | |||
Water Penny | |||
Sub Total: | 78 | 2 | |
Category 2 - Somewhat Pollution Tolerant | Alderfly larva | ||
Aquatic Beetle | |||
Aquatic Sowbug | |||
Clam, Mussel | |||
Cranefly Larva | |||
Crayfish | |||
Damselfy Larva | |||
Dragonfly Larva | |||
Fishfly Larva | |||
1 | 1 | Scud | |
Watersnipe Larva | |||
Sub Total: | 1 | 1 | |
Category 3 - Pollution Tolerant | 24 | 2 | Aquatic Worm |
Blackfly Larva | |||
Leech | |||
8 | 1 | Midge Larva (chironomid) | |
Planarian | |||
Pouch Snail | |||
Truebug Adult | |||
Water Mite | |||
Sub Total: | 32 | 3 |