Effects of an Insecticide and Potential Predators on Green Frogs and Northern Cricket Frogs

Ade, Catherine M.; Boone, Michelle D.; Puglis, Holly J.

doi:10.1670/09-140.1

Cited by 23 publications

(23 citation statements)

References 40 publications

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“…are particularly resilient to neonicotinoids, with LC50 values much greater than the concentrations measured in our mesocosms (LC50s range from 4100 μg/L to 1 000 000 μg/L ). Also, Ade et al assessed abundance of zooplankton, periphyton, and phytoplankton in their mesocosm exposures and did not find any consistent differences between imidacloprid and control mesocosms over time. There is some evidence to suggest that thiamethoxam is even less toxic to the water flea ( Daphnia pulex ) than several other insecticides , but minimal comparative data are available for imidacloprid and thiamethoxam (and other neonicotinoids) and aquatic invertebrates .…”

Section: Discussionmentioning

confidence: 96%

“…For example, delays of 1.5 d and 7 d were found for wood frog tadpoles exposed to a glyphosate‐based formulation at environmentally representative rates (i.e., up to 2.9 mg acid equivalents/L) . However, Ade et al did not find a delay in time to metamorphic climax in northern cricket frogs ( Acris crepitans ) or differences in Gosner developmental stage in green frogs ( Lithobates [formerly Rana ] clamitans ) when exposed to field application rates (i.e., 9 mg/L) of an imidacloprid‐based formulation. Although Ade et al used field application rates, the exposure concentration is much higher than the concentrations that have been detected in the aquatic environment (ranging up to 320 μg/L ).…”

Section: Discussionmentioning

confidence: 99%

“…However, Ade et al did not find a delay in time to metamorphic climax in northern cricket frogs ( Acris crepitans ) or differences in Gosner developmental stage in green frogs ( Lithobates [formerly Rana ] clamitans ) when exposed to field application rates (i.e., 9 mg/L) of an imidacloprid‐based formulation. Although Ade et al used field application rates, the exposure concentration is much higher than the concentrations that have been detected in the aquatic environment (ranging up to 320 μg/L ). The mean delay in the present study was only 1 d and does not necessarily call for concern from an ecological perspective.…”

Section: Discussionmentioning

confidence: 99%

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Sublethal effects on wood frogs chronically exposed to environmentally relevant concentrations of two neonicotinoid insecticides

Robinson

Richardson

Dalton

et al. 2017

Enviro Toxic and Chemistry

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Neonicotinoids are prophylactically used globally on a variety of crops, and there is concern for the potential impacts of neonicotinoids on aquatic ecosystems. The intensive use of pesticides on crops has been identified as a contributor to population declines of amphibians, but currently little is known regarding the sublethal effects of chronic neonicotinoid exposure on amphibians. The objective of the present study was to characterize the sublethal effect(s) of exposure to 3 environmentally relevant concentrations (1 mg/L, 10 mg/L, and 100 mg/L) of 2 neonicotinoids on larval wood frogs (Lithobates sylvaticus) using outdoor mesocosms. We exposed tadpoles to solutions of 2 commercial formulations containing imidacloprid and thiamethoxam, and assessed survival, growth, and development. Exposure to imidacloprid at 10 mg/L and 100 mg/L increased survival and delayed completion of metamorphosis compared with controls. Exposure to thiamethoxam did not influence amphibian responses. There was no significant effect of any treatment on body mass or size of the metamorphs. The results suggest that current usage of imidacloprid and thiamethoxam does not pose a threat to wood frogs. However, further assessment of both direct and indirect effects on subtle sublethal endpoints, and the influence of multiple interacting stressors at various life stages, is needed to fully understand the effects of neonicotinoids on amphibians.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Sublethal effects on wood frogs chronically exposed to environmentally relevant concentrations of two neonicotinoid insecticides

Robinson

Richardson

Dalton

et al. 2017

Enviro Toxic and Chemistry

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“…Ade et al [38] found cricket frogs to be more sensitive to both the insecticide imidacloprid and aquatic predators than green frog larvae; therefore, increased survival of cricket frogs in the buffered ponds could indicate lower contaminant levels than in the unbuffered ponds, which could be expected because vegetation has been shown to filter out contaminants [21]–[23]. Regardless of the different effects of the buffer zone on the survival of green frogs and cricket frogs, in natural ponds, survival to metamorphosis is typically 2–5% [41]–[44].…”

Section: Discussionmentioning

confidence: 99%

Effects of Terrestrial Buffer Zones on Amphibians on Golf Courses

Puglis

Boone

2012

PLoS ONE

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A major cause of amphibian declines worldwide is habitat destruction or alteration. Public green spaces, such as golf courses and parks, could serve as safe havens to curb the effects of habitat loss if managed in ways to bolster local amphibian communities. We reared larval Blanchard's cricket frogs (Acris blanchardi) and green frogs (Rana clamitans) in golf course ponds with and without 1 m terrestrial buffer zones, and released marked cricket frog metamorphs at the golf course ponds they were reared in. Larval survival of both species was affected by the presence of a buffer zone, with increased survival for cricket frogs and decreased survival for green frogs when reared in ponds with buffer zones. No marked cricket frog juveniles were recovered at any golf course pond in the following year, suggesting that most animals died or migrated. In a separate study, we released cricket frogs in a terrestrial pen and allowed them to choose between mown and unmown grass. Cricket frogs had a greater probability of using unmown versus mown grass. Our results suggest that incorporating buffer zones around ponds can offer suitable habitat for some amphibian species and can improve the quality of the aquatic environment for some sensitive local amphibians.

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“…Although a slew of hypotheses have been suggested to explain this species’ decline, including changes in terrestrial and aquatic habitats, parasites and disease, and contamination (Lannoo ; Beasley et al ; Steiner and Lehtinen ; Lehtinen and Skinner ), there is not a clear causal factor for widespread cricket frog declines, despite a number of studies exploring this question (e.g., Lehtinen and Skinner ; McCallum ; Youngquist et al ). However, experimental field studies have suggested that cricket frogs may be sensitive to contaminants, with unexpected strong negative effects on survival or juvenile recruitment in some cases (Ade and Boone ; Puglis and Boone ; Hoskins and Boone , 2018), although at concentrations generally above expected environmental concentrations.…”

Section: Introductionmentioning

confidence: 99%

An amphibian with a contracting range is not more vulnerable to pesticides in outdoor experimental communities than common species

Boone

2018

Enviro Toxic and Chemistry

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In areas with heavy pesticide use, it is easy to attribute population declines to environmental contamination. The Blanchard's cricket frogs (Acris blanchardi) is an amphibian experiencing declines and range contractions across its distribution in the Midwest Corn Belt (USA). Experimental studies suggest that cricket frogs are sensitive to pesticides, but there are few studies examining this species' susceptibility to contaminants in realistic environments or comparing relative impacts with other anuran species. I reared 3 summer breeding anurans in outdoor mesocosms posthatching through metamorphosis to examine the effects of 2 insecticides (imidacloprid and carbaryl) and 1 herbicide (glyphosate with polyoxyethylene tallow amine) on larval development and metamorphosis. Cricket frogs were positively affected by insecticide exposure, likely a result of changes in the food web that increased food abundance. However, metamorphosis of green frogs (Lithobates clamitans) and gray tree frogs (Hyla chrysoscelis) appeared unaffected by pesticide exposure. The results of the present study suggest that the impacts of pesticides alone are unlikely to have population-level impacts for the anurans examined. Environ Toxicol Chem 2018;37:2699-2704. © 2018 SETAC.

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Effects of an Insecticide and Potential Predators on Green Frogs and Northern Cricket Frogs

Cited by 23 publications

References 40 publications

Sublethal effects on wood frogs chronically exposed to environmentally relevant concentrations of two neonicotinoid insecticides

Sublethal effects on wood frogs chronically exposed to environmentally relevant concentrations of two neonicotinoid insecticides

Effects of Terrestrial Buffer Zones on Amphibians on Golf Courses

An amphibian with a contracting range is not more vulnerable to pesticides in outdoor experimental communities than common species

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