7200

• UCREFRP Catalog Number: 7200
• Author: Odenkirchen, E. W. and R. Eisler.
• Title: Chlorpyrifos Hazards to Fish, Wildlife, and Invertebrates
• USFW Year: 1988.
• USFW - Doc Type: A Synoptic Review.
• Copyright Material: NO

Table 7. Chlorpyrifos effects on selected ecosystems.

Ecosystem, and other
information

Application rate and
other variables

Effects and reference

AQUATIC

lake

Freshwater lake

Flooded rice
field

Freshwater ponds,
(8 m X 17 m X
0.3 m deep)

0.004 kgjha, emulsifiable
concentrate, oil diluent
single application

0.014 kgjha (equivalent
to about 1.2 ug/l),
single application

Individual applications of
0.014 to 0.019 kg/ha,
emulsifiable concentrate,
oil diluent, 3 applica-
tions at 5-week intervals

Individual applications of
0.011, 0.056, 0.11, or
1.11 kgjha; 4 applica-
tions at 2-week inter~
vals

18

After 24 hours, aquatic
insect populations re-
duced 14% to 40% and
snails reduced 10%
(Moore and Breeland
1967).

Freshwater algae (Ankistro-
desmus sp., Tetraedron
sp.) reduced 30% to 90%
7 days posttreatment;
reduced population
growth evident one year
postapplication (Brown
et al. 1976).

Mortality after 72 hours,
32% in caged bluegills
(lepomis macrochirus), 50%
to 70% in mayfly nymphs
(Siphlonurus sp.), and
32% in predatory diving
beetles (Washino et al.
1972).

Initial population inhi-
bition of mosquitofish
(Gambusia sp.), but re-
production resumed
except for 1.11 kg/ha
group. Fish whole body
residues in 0.056 kg/ha
group, in mgjkg body
weight, were 2.8 at 4
hours, 1.7 at 24 hours,
and 0.1 after 2 weeks.
Insect and zooplankton
populations reduced