Response of invertebrates to glyphosate-induced habitat alterations in wetlands

Linz, George M.; Bleier, William J.; Overland, John D.; Homan, H. Jeffrey

doi:10.1007/bf03161751

Cited by 24 publications

(31 citation statements)

References 15 publications

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“…There was, however, a negative relationship between chironomid emergence rates and plant cover across all treated sides of wetlands in August 2009, suggesting that the loss of macrophytes from herbicide treatments led to increased chironomid abundance, possibly through some intermediary mechanism such as a loss of predators or increased food amounts. These results concur with another study that found higher emergence rates of chironomids after removal of macrophytes with a glyphosate-based herbicide [15].…”

Section: Discussionsupporting

confidence: 92%

The direct and indirect effects of a glyphosate‐based herbicide and nutrients on Chironomidae (Diptera) emerging from small wetlands

Baker

Mudge

Houlahan

et al. 2014

Enviro Toxic and Chemistry

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Laboratory and mesocosm experiments have demonstrated that some glyphosate-based herbicides can have negative effects on benthic invertebrate species. Although these herbicides are among the most widely used in agriculture, there have been few multiple-stressor, natural system-based investigations of the impacts of glyphosate-based herbicides in combination with fertilizers on the emergence patterns of chironomids from wetlands. Using a replicated, split-wetland experiment, the authors examined the effects of 2 nominal concentrations (2.88 mg acid equivalents/L and 0.21 mg acid equivalents/L) of the glyphosate herbicide Roundup WeatherMax, alone or in combination with nutrient additions, on the emergence of Chironomidae (Diptera) before and after herbicide-induced damage to macrophytes. There were no direct effects of treatment on the structure of the Chironomidae community or on the overall emergence rates. However, after macrophyte cover declined as a result of herbicide application, there were statistically significant increases in emergence in all but the highest herbicide treatment, which had also received no nutrients. There was a negative relationship between chironomid abundance and macrophyte cover on the treated sides of wetlands. Fertilizer application did not appear to compound the effects of the herbicide treatments. Although direct toxicity of Roundup WeatherMax was not apparent, the authors observed longer-term impacts, suggesting that the indirect effects of this herbicide deserve more consideration when assessing the ecological risk of using herbicides in proximity to wetlands.

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Section: Discussionsupporting

confidence: 92%

The direct and indirect effects of a glyphosate‐based herbicide and nutrients on Chironomidae (Diptera) emerging from small wetlands

Baker

Mudge

Houlahan

et al. 2014

Enviro Toxic and Chemistry

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“…Many herbicides used in forestry and agriculture have been tested for effects on biota in streams but rarely in wetlands. Linz et al [36] examined the effects of glyphosate in prairie pothole wetlands. They found a significant increase in macroinvertebrate and chironomid abundance in treated wetlands and suggested that this was an indirect effect caused by increased food resources resulting from cattails ( Typha spp.)…”

Section: Discussionmentioning

confidence: 99%

Effects of the herbicide imazapyr on benthic macroinvertebrates in a logged pond cypress dome

Fowlkes

Michael

Crisman

et al. 2003

Enviro Toxic and Chemistry

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Increased herbicide use in silviculture over the last several decades has led to concern over potential water contamination, which may affect biotic health. In the southeastern United States, pine flatwoods are important for timber production and are often interspersed with cypress wetlands. Cypress domes are isolated, shallow basins that collect surficial waters from adjacent forested areas and therefore might be expected to contain pesticide from storm runoff. This study utilizes in situ microcosm experiments to assess the effects of a concentration gradient of the herbicide imazapyr (0.184, 1.84, and 18.4 mg/L, equivalent to 1, 10, and 100 times the expected environmental concentration from a normal application rate) on the macroinvertebrate community of a logged pond cypress dome using changes in macroinvertebrate composition, chironomid biomass, and chironomid head-capsule deformities. The control core was not significantly different from the surrounding cypress dome for any parameter, suggesting that enclosure effects were likely of minimal importance in the final experimental results. The lack of statistical difference (p < 0.05) in macroinvertebrate community composition, chironomid deformity rate, and chironomid biomass between treatments suggests that imazapyr did not affect the macroinvertebrate community at the concentrations tested. Chironomid deformity rate ranged from 0.97% for imazapyr control to 4.96% for the 100x treatment, with chironomid biomass being 1.79 and 1.87 mg/L, respectively.

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“…Populations of some aquatic invertebrates were also enhanced by a reduction in cattail (reedmace -Typha spp.) cover with glyphosate-based herbicide (Linz et al 1999).…”

Section: Unwanted Especially Exotic Speciesmentioning

confidence: 99%