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Freshwater Macroinvertebrate Survey
(Based in part on the FDEP Biorecon protocol and Izaak Walton League of America)
Site:____251________________
Date:___1/3/04______________ Sampler's name:__Dolly_________
Habitat Number of sweeps
Snags/ woody debris __0_
rock/ shell rubble __1_
leaf packs or mats __1
vegetation __2
Site appropriate for invertebrate collection _yes_
Use the following letter codes to record the relative amounts of organisms
found in your 4 sweeps. Now add up the number of letters in each column
and multiple by the indicated value.
R (Rare)= 1 - 3
C (Common) = 4 - 10
A (Abundant) = 10 - 30
D (Dominant) = > 30
Sensitive SOMEWHAT SENSITIVE TOLERANT
hellgrammite ____ clams ____ leeches ____
mayfly nymphs ____ crayfish ____ midge larvae __C__
riffle beetle ____ damselfly nymphs __C pouch snails __R__
stonefly nymphs ____ dragonfly nymphs ____ worms ____
caddisfly larvae __R amphipods _R___
isopods ____
gilled snails __A__
beetle larvae ____
shrimp ____
blackfly larvae ____
# of letters X 3 = _3__ # of letters X 2 = ___6 # of letters X 1 = _2__
Now add together the 3 values to get your total index value = _10__
The total index value will give you an indication of the water quality
of your stream. Good water quality is reflected by a variety of
different organisms, with no one kind making up the majority of the sample.
WATER QUALITY RATING
Excellent (>24) ____ Good (19-24) ____ Fair (12-18) ____ Poor (<12) _X
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