Toxicities of some heavy metals to the tadpoles of frog, Microhyla ornata (dumeril &amp; bibron)

Rao, I. Jayaprakash; Madhyastha, M. N.

doi:10.1016/0378-4274(87)90186-x

Cited by 19 publications

(5 citation statements)

References 10 publications

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“…While we did not detect iron in our water samples and the concentrations of arsenic and nickel were well below the recommended thresholds and reported LC50 values, the case of manganese attracts more attention. The registered values in the control pond are similar to the lowest LC50 values reported for the Australian ornamented pygmy frog, Microhyla ornata [37], while at the same time, they are fifteen times lower than those which have been reported for the Asian common toad, Duttaphrynus melanostictus [38] (Table 2). Both of these species are mainly terrestrial, breeding in shallow temporary ponds, so the extreme sensitivity of M. ornata is probably due to its very small size (adult frogs reach only around 2.5 cm) [37] more than any other factor; this can also explain the tolerance of D. melanostictus, which grows up to 20 cm [38].…”

Section: Discussionsupporting

confidence: 80%

“…The registered values in the control pond are similar to the lowest LC50 values reported for the Australian ornamented pygmy frog, Microhyla ornata [37], while at the same time, they are fifteen times lower than those which have been reported for the Asian common toad, Duttaphrynus melanostictus [38] (Table 2). Both of these species are mainly terrestrial, breeding in shallow temporary ponds, so the extreme sensitivity of M. ornata is probably due to its very small size (adult frogs reach only around 2.5 cm) [37] more than any other factor; this can also explain the tolerance of D. melanostictus, which grows up to 20 cm [38]. In this regard, the higher manganese concentrations in the control pond are likely to have a greater negative effect on H. orientalis compared to the other two larger species.…”

Section: Discussionsupporting

confidence: 80%

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Rice Fields as Important Habitats for Three Anuran Species—Significance and Implications for Conservation

Lukanov,

Kolev,

Dimitrova

et al. 2023

Animals

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Agriculture can have different effects on wildlife depending on land-use type and extensive/intensive practices. The aim of this study was to establish the significance of rice fields in Central Bulgaria as anuran habitats. We used Audiomoth acoustic loggers to record calling activity at three sites near the city of Plovdiv—one shallow pond and two rice fields—from June to September in 2022 and 2023. We registered the three most widespread species in the region—Bufotes viridis, Hyla orientalis and Pelophylax ridibundus—and created pattern-matching models for them using the free web interface Arbimon, which enabled us to perform presence/absence counts and abundance estimates. At the beginning and the end of the rice vegetation period, water samples were collected and analysed for 62 substances. Substance concentrations were compared between ponds and with LC50 data from the available literature. We registered 19 and 21 substances in 2022 and 2023, respectively, with concentrations within the accepted limits, and although some metals were near risk levels, this was not reflected in the presence counts or the abundance estimates. The results indicated that frog activity was not related to any of the registered substances, but that it was positively correlated with daily rainfall and was higher in the rice fields.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 80%

Rice Fields as Important Habitats for Three Anuran Species—Significance and Implications for Conservation

Lukanov,

Kolev,

Dimitrova

et al. 2023

Animals

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“…Other effects may include impaired reproduction, growth inhibition, behavioral modification, and various sublethal effects (Zillioux et al 1993). Of Hg, cadmium, copper, manganese, and zinc, Jayaprakash and Madhyastha (1987) found that Hg was the most toxic to larval ornate narrowmouthed toads (Microhyla ornata). Teratogenic and lethal effects of Hg have also been documented for other larval amphibians (Dial 1976;Chang et al 1974;Punzo 1993).…”

Section: Introductionmentioning

confidence: 98%

Mercury contamination in three species of anuran amphibians from the Cache Creek Watershed, California, USA

Hothem

Jennings

Crayon

2009

Environ Monit Assess

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Fish and wildlife may bioaccumulate mercury (Hg) to levels that adversely affect reproduction, growth, and survival. Sources of Hg within the Cache Creek Watershed in northern California have been identified, and concentrations of Hg in invertebrates and fish have been documented. However, bioaccumulation of Hg by amphibians has not been evaluated. In this study, adult and juvenile American bullfrogs (Lithobates catesbeianus) and foothill yellow-legged frogs (Rana boylii), adult Northern Pacific treefrogs (Pseudacris regilla), and larval bullfrogs were collected and analyzed for total Hg. One or more species of amphibians from 40% of the 35 sites had mean Hg concentrations greater than the US Environmental Protection Agency's tissue residue criterion for fish (0.3 microg/g). Of the bullfrog tissues analyzed, the liver had the highest concentrations of both total Hg and methyl mercury. Total Hg in carcasses of bullfrogs was highly correlated with total Hg in leg muscle, the tissue most often consumed by humans.

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“…Metamorphosis is accompanied by large changes in morphology and physiology, requires an extraordinary energetic expense, and can exacerbate the toxicity of contaminants . Amphibians retain Hg during metamorphosis, , and sensitivity to MeHg exposure is heightened during this major developmental change . Thus, frogs are contending with the stress of metamorphosis while their internal concentration of a potent neurotoxin simultaneously doubles, potentially exacerbating existing health challenges associated with multiple stressors.…”

Section: Discussionmentioning

confidence: 99%

“…52 Amphibians retain Hg during metamorphosis, 26,50 and sensitivity to MeHg exposure is heightened during this major developmental change. 53 Thus, frogs are contending with the stress of metamorphosis while their internal concentration of a potent neurotoxin simultaneously doubles, potentially exacerbating existing health challenges associated with multiple stressors. Recognizing these under-appreciated changes in chemical signatures across life stages provides critical context for understanding how species with complex life cycles may be affected by Hg throughout the life cycle, which in turn may affect food web fluxes of Hg and other contaminants within and between ecosystems.…”

Section: ■ Discussionmentioning

confidence: 99%

Complex Life Histories Alter Patterns of Mercury Exposure and Accumulation in a Pond-Breeding Amphibian

Rowland

Muths

Eagles‐Smith

et al. 2023

Environ. Sci. Technol.

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Quantifying how contaminants change across life cycles of species that undergo metamorphosis is critical to assessing organismal risk, particularly for consumers. Pond-breeding amphibians can dominate aquatic animal biomass as larvae and are terrestrial prey as juveniles and adults. Thus, amphibians can be vectors of mercury exposure in both aquatic and terrestrial food webs. However, it is still unclear how mercury concentrations are affected by exogenous (e.g., habitat or diet) vs endogenous factors (e.g., catabolism during hibernation) as amphibians undergo large diet shifts and periods of fasting during ontogeny. We measured total mercury (THg), methylmercury (MeHg), and isotopic compositions (δ 13 C, δ 15 N) in boreal chorus frogs (Pseudacris maculata) across five life stages in two Colorado (USA) metapopulations. We found large differences in concentrations and percent MeHg (of THg) among life stages. Frog MeHg concentrations peaked during metamorphosis and hibernation coinciding with the most energetically demanding life cycle stages. Indeed, life history transitions involving periods of fasting coupled with high metabolic demands led to large increases in mercury concentrations. The endogenous processes of metamorphosis and hibernation resulted in MeHg bioamplification, thus decoupling it from the light isotopic proxies of diet and trophic position. These step changes are not often considered in conventional expectations of how MeHg concentrations within organisms are assessed.

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Toxicities of some heavy metals to the tadpoles of frog, Microhyla ornata (dumeril & bibron)

Cited by 19 publications

References 10 publications

Rice Fields as Important Habitats for Three Anuran Species—Significance and Implications for Conservation

Rice Fields as Important Habitats for Three Anuran Species—Significance and Implications for Conservation

Mercury contamination in three species of anuran amphibians from the Cache Creek Watershed, California, USA

Complex Life Histories Alter Patterns of Mercury Exposure and Accumulation in a Pond-Breeding Amphibian

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