Drift response of stream invertebrates to aerial applications of glyphosate

Kreutzweiser, David P.; Kingsbury, P. D.; Feng, Joseph C.

doi:10.1007/bf01699957

Cited by 24 publications

(10 citation statements)

References 5 publications

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“…Among the latter, most studies have used laboratory bioassays to assess the effects of glyphosate on aquatic organisms (e.g., Hartman and Martin 1985, Gardner et al 1997, Relyea 2004, Schaffer and Sebetich 2004. Field studies, on the other hand, have mostly focused on fish, especially salmonids (Mitchell et al 1987, Servizi et al 1987, Wan et al 1989), invertebrates (Folmar et al 1979, Kreutzweiser et al 1989, and amphibians (e.g., Relyea 2005a, b, Relyea et al 2005. Despite the importance of phytoplankton and periphyton communities at the base of the aquatic food webs, fewer studies have investigated the effects of glyphosate on freshwater microbial communities (Pechlaner 2002).…”

Section: Introductionmentioning

confidence: 99%

Effects of the Herbicide Roundup on Freshwater Microbial Communities: A Mesocosm Study

Pérez

Torremorell

Mugni

et al. 2007

Ecological Applications

152

102

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The impact of the widely used herbicide glyphosate has been mainly studied in terrestrial weed control, laboratory bioassays, and field studies focusing on invertebrates, amphibians, and fishes. Despite the importance of phytoplankton and periphyton communities at the base of the aquatic food webs, fewer studies have investigated the effects of glyphosate on freshwater microbial assemblages. We assessed the effect of the commercial formulation Roundup using artificial earthen mesocosms. The herbicide was added at three doses: a control (without Roundup) and two treatments of 6 and 12 mg/L of the active ingredient (glyphosate). Estimates of the dissipation rate (k) were similar in the two treatments (half-lives of 5.77 and 7.37 d, respectively). The only two physicochemical parameters showing statistically significant differences between treatments and controls were the downward vertical spectral attenuation coefficient kd(lambda), where lambda is wavelength, and total phosphorus concentration (TP). At the end of the experiment, the treated mesocosms showed a significant increase in the ratio kd(490 nm)/k(d)(550 nm) and an eightfold increase in TP. Roundup affected the structure of phytoplankton and periphyton assemblages. Total micro- and nano-phytoplankton decreased in abundance in treated mesocosms. In contrast, the abundance of picocyanobacteria increased by a factor of about 40. Primary production also increased in treated mesocosms (roughly by a factor of two). Similar patterns were observed in the periphytic assemblages, which showed an increased proportion of dead: live individuals and increased abundances of cyanobacteria (about 4.5-fold). Interestingly, the observed changes in the microbial assemblages were captured by the analysis of the pigment composition of the phytoplankton, the phytoplankton absorption spectra, and the analysis of the optical properties of the water. The observed changes in the structure of the microbial assemblages are more consistent with a direct toxicological effect of glyphosate rather than an indirect effect mediated by phosphorus enrichment.

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Section: Introductionmentioning

confidence: 99%

Effects of the Herbicide Roundup on Freshwater Microbial Communities: A Mesocosm Study

Pérez

Torremorell

Mugni

et al. 2007

Ecological Applications

152

102

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“…Kreutzweiser et al [24] investigated the response of stream invertebrates to aerial application of Roundup and found that movements of most invertebrates were not measurably affected. Solberg [25] also found no significant adverse effects on aquatic invertebrate abundance or diversity following aerial glyphosate treatment.…”

Section: Discussionmentioning

confidence: 98%

Effects of rodeo® and garlon® 3A on nontarget wetland species in central Washington

Gardner

Grue

1996

Enviro Toxic and Chemistry

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Abstract-Purple loosestrife (Lythrum salicaria) is an invasive wetland perennial that became established in northeastern North America in the early 1800s. Despite its designation as a noxious weed, its distribution has continued to expand. Treatment with herbicides is the most widely used means of controlling purple loosestrife. This study examined the nontarget effects of two herbicides, Rodeo and Garlon 3A, currently used or being considered for use in controlling purple loosestrife in Washington State, respectively. Growth and/or survival of duckweed, Daphnia, and rainbow trout were monitored for at least 24 h following an application of each herbicide. Free-living water column and benthic invertebrates were monitored 24 h and 7 d post-spray using activity traps and sediment cores. Neither chemical was associated with significant decreases in survival or growth of the bioassay organisms, with the exception that growth of duckweed was reduced 48 h after exposure to Rodeo. Nor were significant decreases in the abundance of free-living aquatic invertebrates detected following the herbicide applications. Results suggest that neither herbicide, at the application rates used, poses a hazard to aquatic invertebrates in wetlands in central Washington. However, Rodeo, because it is a broad-spectrum herbicide, may pose a greater hazard to nontarget aquatic vegetation.

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“…However, no acute mortality, changes in over-winter mortality, growth rate or probability of using the tributary were observed for resident fingerlings [93]. Kreutzweiser et al [94] also reported minimal effects on the drift patterns of stream insects in these streams. A New Zealand study also found no significant interactions between fine sediment and benthic invertebrates when exposed to glyphosate.…”

Section: Direct Effectsmentioning

confidence: 99%

The Risks Associated with Glyphosate-Based Herbicide Use in Planted Forests

Rolando¹,

Baillie²,

Thompson³

et al. 2017

Forests

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Abstract:Glyphosate-based herbicides are the dominant products used internationally for control of vegetation in planted forests. Few international, scientific syntheses on glyphosate, specific to its use in planted forests, are publically available. We provide an international overview of the current use of glyphosate-based herbicides in planted forests and the associated risks. Glyphosate is used infrequently in planted forests and at rates not exceeding 4 kg ha −1 . It is used within legal label recommendations and applied by trained applicators. While the highest risk of human exposure to glyphosate is during manual operational application, when applied according to label recommendations the risk of exposure to levels that exceed accepted toxicity standards is low. A review of the literature on the direct and indirect risks of operationally applied glyphosate-based herbicides indicated no significant adverse effects to terrestrial and aquatic fauna. While additional research in some areas is required, such as the use of glyphosate-based products in forests outside of North America, and the potential indirect effects of glyphosate stored in sediments, most of the priority questions have been addressed by scientific investigations. Based on the extensive available scientific evidence we conclude that glyphosate-based herbicides, as typically employed in planted forest management, do not pose a significant risk to humans and the terrestrial and aquatic environments.

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Drift response of stream invertebrates to aerial applications of glyphosate

Cited by 24 publications

References 5 publications

Effects of the Herbicide Roundup on Freshwater Microbial Communities: A Mesocosm Study

Effects of the Herbicide Roundup on Freshwater Microbial Communities: A Mesocosm Study

Effects of rodeo® and garlon® 3A on nontarget wetland species in central Washington

The Risks Associated with Glyphosate-Based Herbicide Use in Planted Forests

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