Impact of glufosinate‐ammonium and bialaphos on the zooplankton community of a small eutrophic northern lake

Faber, Marvin J.; Thompson, Dean G.; Stephenson, Gerald R.; Kreutzweiser, David P.

doi:10.1002/etc.5620170714

Cited by 18 publications

(11 citation statements)

References 20 publications

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“…The enclosure design, deployment, pesticide application, and sampling protocols are given in detail in Faber et al (1998) and . Briefly, polyethylene-lined square enclosures (5 m ϫ 5 m ϫ approximately 1 m deep) were deployed in a forest headwater pond near Sault Ste.…”

Section: Enclosure Applications and Samplingmentioning

confidence: 99%

Ordination of Zooplankton Community Data to Detect Pesticide Effects in Pond Enclosures

Kreutzweiser

Faber²

1999

Arch. Environ. Contam. Toxicol.

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Trends in community structure of crustacean zooplankton among 17 forest pond enclosures (5 m x 5 m x 1 m deep) were examined and analyzed to determine effects of two candidate forest pesticides. Eight enclosures were treated at two concentrations of an experimental insecticide, tebufenozide; five were treated at two concentrations of a biological herbicide, bialaphos; and four served as controls. Zooplankton community structure was characterized by ordination of species assemblages using principle components analysis (PCA) and correspondence analysis (CA). Two-dimensional plots of the first two axes from PCA and CA were constructed to explore temporal and treatment-related patterns in community structure. The first four axes of both ordination functions were used as multivariate descriptors of community structure and were examined for differences among treatments by ANOVA. Species ordination plots and sorted rotated factor loadings provided objective means of identifying the species important in determining divergence in community structure. These were considered indicator species and were examined for differences among treatments by ANOVA and specified contrasts. The ordination and subsequent analysis revealed trends in community structure and sample differences that indicated clear, concentration-dependent effects of bialaphos and equivocal effects of tebufenozide.

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Section: Enclosure Applications and Samplingmentioning

confidence: 99%

Ordination of Zooplankton Community Data to Detect Pesticide Effects in Pond Enclosures

Kreutzweiser

Faber²

1999

Arch. Environ. Contam. Toxicol.

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“…These relationships suggest that accidental overspray of lentic ecosystems may generate some transient reduction in phytoplankton populations, particularly in the small classes, but that drift events are unlikely to have significant effects on phytoplankton abundance. Further, the relative sensitivity of higher plants and zooplankton [18] suggests that these components of the ecosystem may be at greater risk than the phytoplankton community.…”

Section: Discussionmentioning

confidence: 99%

Impact of Glufosinate-Ammonium and Bialaphos on the Phytoplankton Community of a Small Eutrophic Northern Lake

Faber

Thompson

Stephenson

et al. 1998

Environ Toxicol Chem

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The impact of glufosinate-ammonium and bialaphos on the phytoplankton community in a shallow eutrophic lake ecosystem was investigated using in situ enclosures. Flow cytometry was used to size phytoplankton cells and sort them as live or dead, depending upon their chlorophyll a autofluorescence intensity. Flow cytometric analyses provided significantly (p Ͻ 0.001) higher abundance estimates as compared to conventional microscopic analyses. At the highest treatment levels (10 mg/L), both herbicides caused a significant but transient reduction in live phytoplankton cells (days 3-14), which was particularly apparent in the small (1-2 and 2-3 m) classes. Transient impacts on phytoplankton live cell abundances were mirrored by depression in dissolved oxygen content in the treated enclosures. At an application rate of 10 mg/L, abundance of smaller phytoplankton in the bialaphos-treated enclosures recovered more rapidly (14 d) than those in the glufosinate-ammonium-treated enclosures (49 d). For days of maximal impact, estimated median effect concentrations (EC50) for reduction of phytoplankton abundance ranged from 2.5 to 3.4 mg/L for glufosinate-ammonium and 3.3 to 8.1 mg/L for bialaphos, whereas estimates of concentration inducing 20% reductions in abundance (EC20; 0.9-1.2 and 1.6-4 mg/L, respectively) more closely approximated the expected environmental concentration (1 mg/L), assuming direct overspray into water bodies of 15-cm depth.

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“…The stimulatory effect observed in this study may have resulted from a species shift to similarly resistant species occurring naturally in the community or a more general increase in smaller phytoplankton cells as a result of reduced zooplankton grazing pressure. The latter possibility is further explored in the companion paper relating to effects on the zooplankton community [18].…”

Section: Discussionmentioning

confidence: 99%

“…These relationships suggest that accidental over‐spray of lentic ecosystems may generate some transient reduction in phytoplankton populations, particularly in the small classes, but that drift events are unlikely to have significant effects on phytoplankton abundance. Further, the relative sensitivity of higher plants and zooplankton [18] suggests that these components of the ecosystem may be at greater risk than the phytoplankton community.…”

Section: Discussionmentioning

confidence: 99%

“…Treatments involved a range of environmentally relevant concentrations of glufosinate‐ammonium (Ignite) and bialaphos (Herbiace). Observations of the impact on the phytoplankton community as determined by flow cytometry and traditional microscopy are reported in this paper, whereas the impact of these herbicides on the zooplankton community is discussed in a companion paper [18].…”

Section: Introductionmentioning

confidence: 99%

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Impact of glufosinate‐ammonium and bialaphos on the phytoplankton community of a small eutrophic northern lake

Faber¹,

Thompson²,

Stephenson³

et al. 1998

Enviro Toxic and Chemistry

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Abstract-The impact of glufosinate-ammonium and bialaphos on the phytoplankton community in a shallow eutrophic lake ecosystem was investigated using in situ enclosures. Flow cytometry was used to size phytoplankton cells and sort them as live or dead, depending upon their chlorophyll a autofluorescence intensity. Flow cytometric analyses provided significantly (p Ͻ 0.001) higher abundance estimates as compared to conventional microscopic analyses. At the highest treatment levels (10 mg/L), both herbicides caused a significant but transient reduction in live phytoplankton cells (days 3-14), which was particularly apparent in the small (1-2 and 2-3 m) classes. Transient impacts on phytoplankton live cell abundances were mirrored by depression in dissolved oxygen content in the treated enclosures. At an application rate of 10 mg/L, abundance of smaller phytoplankton in the bialaphos-treated enclosures recovered more rapidly (14 d) than those in the glufosinate-ammonium-treated enclosures (49 d). For days of maximal impact, estimated median effect concentrations (EC50) for reduction of phytoplankton abundance ranged from 2.5 to 3.4 mg/L for glufosinate-ammonium and 3.3 to 8.1 mg/L for bialaphos, whereas estimates of concentration inducing 20% reductions in abundance (EC20; 0.9-1.2 and 1.6-4 mg/L, respectively) more closely approximated the expected environmental concentration (1 mg/L), assuming direct overspray into water bodies of 15-cm depth.

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Impact of glufosinate‐ammonium and bialaphos on the zooplankton community of a small eutrophic northern lake

Cited by 18 publications

References 20 publications

Ordination of Zooplankton Community Data to Detect Pesticide Effects in Pond Enclosures

Ordination of Zooplankton Community Data to Detect Pesticide Effects in Pond Enclosures

Impact of Glufosinate-Ammonium and Bialaphos on the Phytoplankton Community of a Small Eutrophic Northern Lake

Impact of glufosinate‐ammonium and bialaphos on the phytoplankton community of a small eutrophic northern lake

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