Effects of the herbicide imazapyr on juvenile Oregon spotted frogs

Yahnke, Amy E.; Grue, Christian E.; Hayes, Marc P.; Troiano, Alexandra T.

doi:10.1002/etc.2048

Cited by 9 publications

(8 citation statements)

References 24 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As in our previous study with juvenile Oregon spotted frogs [29], cricket consumption varied by day, although little difference was readily apparent between treatments (Figure 4). However, potential interactions among treatments and deformities were observed when graphs of cricket consumption data were examined (Supplemental Data, Figure S1), and data from our previous study indicated that sex may be important in cricket consumption patterns of juvenile ranid frogs [29]. We included sex and the presence/absence of limb deformities and scoliosis as random factors in the LMM for model exploration.…”

Section: Cricket Consumptionsupporting

confidence: 65%

See 1 more Smart Citation

Effects of the herbicide triclopyr on metamorphic northern red‐legged frogs

Yahnke

Grue

Hayes

et al. 2017

Enviro Toxic and Chemistry

Self Cite

View full text Add to dashboard Cite

Aquatic herbicides are used to manage invasive emergent plants in and around wetlands. Metamorphic frogs that emerge during the aquatic weed management season may be at risk of herbicide exposure. Metamorphic northern red-legged frogs (Rana aurora) were exposed to a triclopyr tank mix labeled for control of broadleaf emergent aquatic weeds such as invasive purple loosestrife (Lythrum salicaria). The tank mix consisted of Renovate® 3 (triclopyr triethylamine salt 44.4%), the modified vegetable oil surfactant Competitor®, and the marker dye Hi-Light . Metamorphs were exposed to the tank mix and a clean-water control for 96 h, and then reared in clean water for 60 d. Exposure to the tank mix resulted in no treatment-related mortalities, no effects on behavior immediately post exposure, and no effects on body or liver condition indices. Exposure to the tank mix resulted in lethargy during exposure and a 1-d delay in completion of metamorphosis. Deformities present in the rearing population confounded results for some endpoints. Observed effects were minimal, especially compared with the potential for ecological impacts from unmanaged invasive plants. Environ Toxicol Chem 2017;36:2316-2326. © 2017 SETAC.

show abstract

Section: Cricket Consumptionsupporting

confidence: 65%

“…Weights (to 0.01 g) were collected at the start and end of the 96‐h exposure, at completion of metamorphosis, at 45 d post metamorphosis, and at the end of the 2‐mo grow‐out, when frogs were euthanized for liver collection. Mass and SVL were converted to body condition for analyses .…”

Section: Methodsmentioning

confidence: 99%

Effects of the herbicide triclopyr on metamorphic northern red‐legged frogs

Yahnke

Grue

Hayes

et al. 2017

Enviro Toxic and Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…Historically, herpetologists have determined body condition in amphibians using body condition indices based on morphometric measurements, typically snout‐vent length, and bodyweight (Băncilă, Hartel, Plăiaşu, Smets, & Cogălniceanu, ; Bell, Carver, Mitchell, & Pledger, ; Denoël, Hervant, Schabetsberger, & Joly, ; Gendron et al, ; Leary, Jessop, Garcia, & Knappa, ; MacCraken & Stebbings, 2012; Pope & Matthews, ; Yahnke, Grue, Hayes, & Troiano, ). Fulton's index (based on the formula:

k = \frac{M}{L^{3}}

where k = Fulton's factor, M = body mass, and L = length) has been used in leopard frogs ( Rana pipiens ) to assess the effect of an agricultural pesticide on lungworm infection (Gendron et al, ; Peig & Green, ).…”

Section: Discussionmentioning

confidence: 99%

“…BCS) was developed for the mountain chicken frog (Leptodactylus fallax) and assessed for intra-and inter-observer variability, as well as correlation with an objective measure of body condition (scaled mass index), in February and March 2016 just prior to the beginning of the breeding season. To the author's knowledge this is the first BCS to be developed and assessed for any amphibian species.Historically, herpetologists have determined body condition in amphibians using body condition indices based on morphometric measurements, typically snout-vent length, and bodyweight(Băncilă, Hartel, Plăiaşu, Smets, & Cogălniceanu, 2010;Bell, Carver, Mitchell, & Pledger, 2004;Denoël, Hervant, Schabetsberger, & Joly, 2002;Gendron et al, 2003;Leary, Jessop, Garcia, & Knappa, 2004; MacCraken & Stebbings, 2012;Pope & Matthews, 2002;Yahnke, Grue, Hayes, & Troiano, 2012). Fulton's index (based on the formula:k ¼ M L 3 where k = Fulton's factor, M= body mass, and L = length) has been used in leopard frogs (Rana pipiens) to assess the effect of an agricultural pesticide on lungworm infection (Gendron et al, 2003; Peig & Green, 2010).…”

mentioning

confidence: 99%

Development of a body condition score for the mountain chicken frog (Leptodactylus fallax)

et al. 2018

View full text Add to dashboard Cite

The Critically Endangered mountain chicken frog (Leptodactylus fallax) has undergone drastic population decline due to habitat loss, hunting, invasive species, and chytridiomycosis. In response, several partner institutions initiated a conservation breeding program. It is important to maintain the captive population in good health. Therefore the program partners have recommended establishment of protocols for health examination of the species, including body condition assessment. Visual body condition scoring is a useful means to assess body condition in zoo animals for which regular bodyweight measurements are impractical or associated with capture-related stress. In this study, the authors developed a visual body condition score for the mountain chicken frog based on an ordinal categorical scale from 1 to 5 (1 = lowest body condition, 5 = highest body condition) using anatomical features that vary with total body energy reserves. Veterinary staff, animal managers, keepers, researchers, and students subsequently used the body condition score to assign scores to 98 mountain chicken frogs (41 male, 57 female) aged between 8 months and 12 years housed in five zoos in the UK and Jersey between February and March 2016. Body condition scores showed moderate (rho = 0.54; males) to strong (rho = 0.6; females) correlation with the scaled mass index, an objective measure of total energy reserves. The majority of pairwise comparisons between scores showed slight to substantial intra-observer agreement (93.8%) and slight to almost perfect inter-observer agreement (97.2%). Cases of poor agreement were likely due to limited observer experience working with the species.

show abstract

“…Parrotfeather in these sites was treated with an application of imazapyr in late summer of 2013 (1 month after the first survey). Imazapyr degrades quickly in water and is considered largely non‐toxic to aquatic organisms (Stehr et al ., ; Yahnke et al ., ). Based on univariate and multivariate comparisons between sampling years, we found no evidence for declines in fish density or differential shifts in fish communities between sites that were treated and those that were not.…”

Section: Methodsmentioning

confidence: 97%

Multi‐trophic impacts of an invasive aquatic plant

2016

View full text Add to dashboard Cite

Summary Natural resource agencies are increasingly required to prioritise management of multiple non‐native aquatic plants (macrophytes) in freshwater ecosystems. Characterising the consequences of invasions for ecological processes and corresponding ecosystem services is fundamental to this decision‐making process, but requires an understanding of impacts across physical, chemical, and biological responses. Accordingly, we evaluated the multi‐trophic impacts of the invasive macrophyte Myriophyllum aquaticum (Haloragaceae; parrotfeather) along the mainstem Chehalis River, Washington, U.S.A. We examined invertebrate, plant and fish community responses to varying degrees of parrotfeather abundance and simultaneously characterised variation in physical structure and dissolved oxygen (DO) across the dominant native and non‐native plant species. DO concentrations were significantly reduced and approached hypoxic levels in areas dominated by parrotfeather compared with native vegetation. Increased structural complexity, volume and biomass of parrotfeather was associated with increased diversity of epiphytic invertebrates. However, these more diverse invertebrate assemblages were dominated by amphipods, whereas native macrophytes were characterised by cladocerans, chironomids and gastropods. Non‐native fishes (primarily centrarchid species) were more strongly associated with sites where parrotfeather was present and diversity of non‐native fishes was positively correlated along a gradient of parrotfeather abundance. Native fish associated with parrotfeather areas were those that tend to be tolerant of degraded or lower quality habitats. We saw little evidence of exclusion of other macrophytes; native and non‐native plant diversity and abundance were positively correlated with the parrotfeather gradient. This may reflect that analysis was done at a site level, and competitive dominance might be apparent by changes in species richness at smaller (plot) scales or over longer periods. Alternatively, parrotfeather may demonstrate minimal effects on native plant composition. Given the effects observed across multiple habitat characteristics and biota, parrotfeather appears to be a highly impactful invader where it establishes. Many of the changes we observed appear to derive from the emergent leaves and dense mat formation of parrotfeather compared with a submersed structure more typical of the native community. Our results suggest that managers should specifically consider contrasting characteristics between non‐native and native physical structure when assessing and prioritising threats of invasive macrophytes.

show abstract

Effects of the herbicide imazapyr on juvenile Oregon spotted frogs

Cited by 9 publications

References 24 publications

Effects of the herbicide triclopyr on metamorphic northern red‐legged frogs

Effects of the herbicide triclopyr on metamorphic northern red‐legged frogs

Development of a body condition score for the mountain chicken frog (Leptodactylus fallax)

Multi‐trophic impacts of an invasive aquatic plant

Contact Info

Product

Resources

About