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Glyphosate-based herbicides reduce the activity and reproduction of earthworms
and lead to increased soil nutrient concentrations
#MMPMID26243044
Gaupp-Berghausen M
; Hofer M
; Rewald B
; Zaller JG
Sci Rep
2015[Aug]; 5
(?): 12886
PMID26243044
show ga
Herbicide use is increasing worldwide both in agriculture and private gardens.
However, our knowledge of potential side-effects on non-target soil organisms,
even on such eminent ones as earthworms, is still very scarce. In a greenhouse
experiment, we assessed the impact of the most widely used glyphosate-based
herbicide Roundup on two earthworm species with different feeding strategies. We
demonstrate, that the surface casting activity of vertically burrowing earthworms
(Lumbricus terrestris) almost ceased three weeks after herbicide application,
while the activity of soil dwelling earthworms (Aporrectodea caliginosa) was not
affected. Reproduction of the soil dwellers was reduced by 56% within three
months after herbicide application. Herbicide application led to increased soil
concentrations of nitrate by 1592% and phosphate by 127%, pointing to potential
risks for nutrient leaching into streams, lakes, or groundwater aquifers. These
sizeable herbicide-induced impacts on agroecosystems are particularly worrisome
because these herbicides have been globally used for decades.
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