摘要：Fluoxetine, a selective serotonin reuptake inhibitor (SSRI), is frequently
detected in surface waters globally, yet the effects of
SSRIs on ecological processes at environmentally realistic concentrations
are not currently known. We used a controlled, replicated
artificial stream experiment to expose biofilm, algal and stream
insect communities to two different concentrations of fluoxetine:
20 ng/L (typical concentration detected in surface waters) and
20 mg/L (concentration shown to influence insect emergence and
algal productivity). We quantified a range of community and ecosystem
response metrics over the course of the 21d experiment
including; algal biomass (chl-a), net ecosystem production (NEP),
gross primary production (GPP), ecosystem respiration (ER) and
invertebrate emergence. At 20 ng/L, fluoxetine significantly suppressed
algal colonization on rocks, and reduced GPP after
13 days, but by day 21 chl-a, NEP and GPP did not differ between
treatments and control. Fluoxetine increased ER on leaves where
invertebrates were excluded, but had no effect on leaves accessible
to invertebrates. Streams receiving 20 ng/L of fluoxetine had
adult insects from the order Diptera emerge sooner and at a
greater rate than control streams. Our results suggest that ecosystem
function, including primary production and respiration, and
invertebrate population dynamics are sensitive to SSRIs and that
fluoxetine may alter these key processes concentrations found in
the environment.
