Environmental Engineering Reference
In-Depth Information
Table 5
(continued)
Zooplankton
Macroinvertebrates
Ref
Cosm
Exposure
Taxa
Community
Recovery
Taxa
Community
Recovery
NOAEC
eco
Hurlburt
et al. (
1970
)
Outdoor,
2.9-3.8 m
3
, water
level maintained
twice weekly,
California
Dursban
®
40
EC, 0.01, 0.05,
0.10, 1.0 lb/A
(2
Dominant
zooplankton (
Cyclops
vernalis
and
Moina
micrura
) increased
while
Diaptomus
pallidus
and rotifers
decreased
Not reported
M. micrura
and
C. vernalis
did not
recover after fi rst
treatment of high
doses. Lower doses:
no recovery after
second treatment.
D. pallidus
showed
no consistent
evidence of effect at
low doses, did not
develop populations
at high doses
Corisella decolor
was the only major
insect
Signifi cant reduction
at 10
Not included in
study
Gradual
recovery for all
but the highest
dose. At
200
<2
μ
g L
−1
μ
g L
−1
to
200
g L
−1
)
applied four
times
μ
g L
−1
after
fi rst treatment. Low
populations for all
doses after third
treatment
μ
g L
−1
recovery was
not observed
μ
Hurlburt
et al. (
1972
)
Outdoor, 33 m
3
,
water level
maintained twice
weekly, California
Dursban
®
40
EC, 7.2,
72
Dominant
zooplankton (
Cyclops
vernalis
and
Moina
micrura
) reduced
while
Diaptomus
pallidus
(copepod)
and rotifers increased
Strong negative
correlation between
cladoceran and
rotifer populations
C. vernalis
and
M.
micrura
recovered in
1-3 wk at 7.2
Notonectidae highly
reduced as of 5 wk
post-fi nal treatment,
except nymphs at
7.2
Predaceous insects
were 45% and 9% of
control levels 5 wk
after low and high
dose treatments,
respectively
Predaceous
insects were
affected and
recovered
slowly, while
herbivorous
insects were less
affected and
recovered more
quickly
<7.2
μ
g L
−1
g L
−1
applied three
times
μ
g L
−1
and in 3-6 wk at
72
μ
μ
g L
−1
g L
−1
. Corixids
declined in controls
and adults were more
numerous at
72
μ
g L
−1
. Mayfl ies
decimated at both
doses, fi rst treatment.
Tropisternus
and
Helophorus
also
signifi cantly more
numerous at higher
doses
μ
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