Larval Responses of Three Midwestern Anurans to Chronic, Low-Dose Exposures of Four Herbicides

Williams, Bethany K.; Semlitsch, Raymond D.

doi:10.1007/s00244-009-9390-z

Cited by 54 publications

(52 citation statements)

References 44 publications

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“…Exposure to ecologically relevant levels of atrazine may produce effects ranging from multiple gonads and demasculinization in male frogs to increased disease and parasite sensitivity in amphibians (Hayes et al, 2002a;Forsen and Storfer, 2006). Williams and Semlitsch (2009) reported that low-dose exposures to atrazine and metolachlor did not result in a significant increase in larval mortality in three species of anurans but noted that combinations of commonly used pesticides have elicited negative effects in some studies (Hayes et al, 2006;Relyea, 2009). Metolachlor and several other industrial chemicals have been detected in two Missouri rivers containing Ozark hellbenders (Cryptobranchus alleganiensis bishopi), but the effects of these exposures have not been studied (Solis et al, 2007b).…”

Section: Water Qualitymentioning

confidence: 99%

Health and Habitat Quality Assessment for the Eastern Hellbender (Cryptobranchus Alleganiensis Alleganiensis) in Indiana, Usa

Burgmeier

Unger²,

Meyer³

et al. 2011

Journal of Wildlife Diseases

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ABSTRACT:The eastern hellbender (Cryptobranchus alleganiensis alleganiensis) has experienced precipitous population declines throughout its range. Numerous factors are speculated to be involved, but no empirical evidence has been presented for any. We implemented a populationwide health assessment in Indiana, USA, examining both the physical well-being of individuals and the quality of their habitat. Physicochemical parameters were analyzed directly in the field and later in the laboratory, when appropriate. Samples were collected June 2008-October 2008 and June 2009-September 2009 for reproductive analysis, blood screening, and disease prevalence. Of 27 chemicals screened in water samples, three were found in the study site, including atrazine. Atrazine was found at levels reported to cause reproductive problems in other amphibians. Vitellogenin was detected only in females and proved a reliable indicator of sex. Sperm parameters were generally of high quality and similar to other populations. Most plasma parameters were similar between sexes, although there were significant differences in calcium and potassium concentrations. Abnormalities were common, occurring in 68% of individuals. No hemoparasites were found, but amphibian chytrid fungus (Batrachochytrium dendrobatidis) was detected on one individual. Our findings establish a baseline for hematology and water-quality parameters that can be used as a model for evaluating population health throughout the hellbender range.

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Section: Water Qualitymentioning

confidence: 99%

Health and Habitat Quality Assessment for the Eastern Hellbender (Cryptobranchus Alleganiensis Alleganiensis) in Indiana, Usa

Burgmeier

Unger²,

Meyer³

et al. 2011

Journal of Wildlife Diseases

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“…Exposure to low levels (700 ppb) of the glyphosate herbicide roundup WeatherMax (Monsanto Canada inc., Winnipeg, Manitoba) resulted in 80% mortality of Boreal Chorus Frog tadpoles (Williams and Semlitsch 2010). The high mortality rate is likely a result of the unique surfactant in the product, as roundup Original (Monsanto Canada inc.) did not cause high levels of mortality (Williams and Semlitsch 2010). however, roundup WeatherMax was not available in Canada until the early 2000s, and the Boreal Chorus Frog was declining before that (e.g., Daigle 1997), so it likely does not explain the declines.…”

Section: Discussionmentioning

confidence: 99%

Apparent widespread decline of the Boreal Chorus Frog (<em>Pseudacris maculata</em>) in eastern Ottawa

Seburn

Gunson²,

Schueler³

2014

Can Field Nat

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The Boreal Chorus Frog (Pseudacris maculata) was once common in the eastern Ottawa area. To assess its current status, we conducted auditory surveys at 184 wetlands in 2011 and 2012. Boreal Chorus Frogs were heard at only five (2.7%) of the surveyed sites. These five sites were spatially aggregated, with only 0.5-7.5 km between any two sites. Sites occupied by Boreal Chorus Frogs in eastern Ottawa were surrounded by significantly greater agricultural cover (at 1.0-, 1.5-, and 2.0-km radii), less forest cover (1.0-and 2.0-km radii), and less wetland cover (1.5-and 2.0-km radii) than occupied sites in western Ottawa. Sites in eastern Ottawa that were apparently unoccupied were surrounded by significantly greater agricultural cover (only at the 2.0-km radius), similar forest cover (all radii), and less wetland cover (all radii) compared with occupied sites in western Ottawa. Boreal Chorus Frog populations are commonly subject to extirpation resulting from stochastic events. The reduced wetland cover in eastern Ottawa may be accompanied by reduced wetland connectivity, making recolonization of wetlands difficult or impossible. Our data do not show whether wetland connectivity has been reduced, but future research should address this important topic.

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“…In addition, pesticides may interact with other stressors such as predators Mills 2001, Boone andJames 2003). All this applies to many pesticides, but some non-selective herbicides seem to be amongst the most dangerous for amphibians (see Williams and Semlitsch 2010).…”

Section: Indirect Potential Effects Of Gmos On Anuran Amphibiansmentioning

confidence: 99%

Amphibians as indicators of changes in aquatic and terrestrial ecosystems following GM crop cultivation: a monitoring guideline

Böll¹,

Schmidt

Veith³

et al. 2013

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Amphibians are a suitable indicator group for monitoring possible negative direct or indirect effects of GMO cultivation at the individual and population level. Direct effects could occur in aquatic ecosystems via uptake of GM pollen or GM detritus by anuran larvae. However, indirect negative effects caused by changes in cultivation practices (changes in pesticide use, for instance) are more likely. The VDI Guideline 4333 aims to ensure comprehensive monitoring of the different life-stages of anuran species that are common in agricultural landscapes of Austria, Germany and Switzerland. The guideline includes a novel approach to tadpole monitoring. To assess immediate effects, tadpole, metamorph and adult deformation rates are compared with naturally occurring deformation rates. Adult population size, adult body condition and juvenile emergence are monitored over multiple years to assess long-term effects of GM crop cultivation on population viability. At each study site, monitoring has to be carried out at multiple amphibian breeding sites which differ in their exposure to GM crop cultivation. All monitoring data have to be stored in a central database for future meta-analyses. This will ultimately allow for generalized statements about the impact of GM crop cultivation on amphibians. Although specifically designed for GM crops, VDI Guideline 4333 may also serve as a model for studying the effects of a wider range of stressors on amphibian populations in agriculture and forestry. Susanne Böll et al. / BioRisk 8: 39-51 (2013) 40

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Larval Responses of Three Midwestern Anurans to Chronic, Low-Dose Exposures of Four Herbicides

Cited by 54 publications

References 44 publications

Health and Habitat Quality Assessment for the Eastern Hellbender (Cryptobranchus Alleganiensis Alleganiensis) in Indiana, Usa

Health and Habitat Quality Assessment for the Eastern Hellbender (Cryptobranchus Alleganiensis Alleganiensis) in Indiana, Usa

Apparent widespread decline of the Boreal Chorus Frog (<em>Pseudacris maculata</em>) in eastern Ottawa

Amphibians as indicators of changes in aquatic and terrestrial ecosystems following GM crop cultivation: a monitoring guideline

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