Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

Chemical Taxa/species
Assessment
measures
Daphnia magna (daphnids) Population
abundance at
different phases;
Life stage sensitivity
carbaryl
(survival, 48 h LC50)
carbaryl
carbaryl
formulation
(43.3% a.i.)
Zooplankton pond community Abundance of
zooplankton species
Bluegill sunfish, multiple aquatic
species including
phytoplankton, macrophytes,
zooplankton, and
macroinvertebrates
Abundance and
richness of species
groups;
Fish survival and
growth
Concentrations tested
15 μg/L applied as a
single pulse at different
population phases
(treatments): growing,
density peak, stable
500 μg/L; 1-3
applications to pond
mesocosms;
0.1 mg/L
2, 6, 20, 60, 200 μg/L;
applications at weekly
intervals for 6 weeks
353
Exposure
duration
Effects
Data source
1 pulse at day 70% decline in abundance (Takahashi
8 to growing during growth phase, 92.6% and
treatment (3 decline in peak phase, 34.8 % Hanazato
replicates), decline in stable phase , 2007)
day 11 to compare to a 61% decline in
density peak control population;
treatment ,
day 25 stable
treatment;
48 h
Survival (48h LC50s)
0 – 3 months At 500 μg/L sustained
(Hanazato
reductions in daphnid and and Yasuno
copepod populations. No
observable reductions in rotifer
populations. At 100 μg/L,
reductions in daphnid
population observed, but not
with copepods or rotifers
1990)
0 – 12 weeks, no long term reductions in Registrantwith
6 weekly major invertebrate groups submitted
pulses were observed; no detectable study (1993)
beginning at differences in bluegill survival
week 10 or growth between control and
pesticide treatments,
carbaryl half life was 30 min,
mean pH of treatment groups
in application events ranged
from 9.2-10.3; mean
temperatures ranged from 17 –
27 ◦C, with the majority
between 20-24 ◦C.