The deal with diel: Temperature fluctuations, asymmetrical warming, and ubiquitous metals contaminants

Hallman, Tyler A.; Brooks, Marjorie L.

doi:10.1016/j.envpol.2015.06.005

Cited by 26 publications

(18 citation statements)

References 43 publications

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“…However, Drakulić et al (2017) demonstrated that mean seasonal temperature in Germany and southern Europe was 20 °C and lower suggesting that larvae of R. temporaria may experience mean temperatures within their thermal optimum for maintaining a stable SMR under natural conditions. Climate change is altering patterns of environmental temperature with potentially important repercussions for ectotherms that must simultaneously cope with contaminants or other environmental stressors (Hallman and Brooks 2015). In this study, SMR was increased also at low TH levels through the exposure to SP, and we suggest that aquatic contaminants alone may result in increased metabolism due their toxicity independent from the thyroid metabolism.…”

Section: Altered Th Levels and Higher Temperatures Affect Smr And Bodmentioning

confidence: 48%

Post-metamorphic carry-over effects of altered thyroid hormone level and developmental temperature: physiological plasticity and body condition at two life stages in Rana temporaria

et al. 2020

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Environmental stress induced by natural and anthropogenic processes including climate change may threaten the productivity of species and persistence of populations. Ectotherms can potentially cope with stressful conditions such as extremes in temperature by exhibiting physiological plasticity. Amphibian larvae experiencing stressful environments display altered thyroid hormone (TH) status with potential implications for physiological traits and acclimation capacity. We investigated how developmental temperature (T dev) and altered TH levels (simulating proximate effects of environmental stress) influence the standard metabolic rate (SMR), body condition (BC), and thermal tolerance in metamorphic and post-metamorphic anuran larvae of the common frog (Rana temporaria) reared at five constant temperatures (14-28 °C). At metamorphosis, larvae that developed at higher temperatures had higher maximum thermal limits but narrower ranges in thermal tolerance. Mean CT max was 37.63 °C ± 0.14 (low TH), 36.49 °C ± 0.31 (control), and 36.43 °C ± 0.68 (high TH) in larvae acclimated to different temperatures. Larvae were able to acclimate to higher T dev by adjusting their thermal tolerance, but not their SMR, and this effect was not impaired by altered TH levels. BC was reduced by 80% (metamorphic) and by 85% (postmetamorphic) at highest T dev. The effect of stressful larval conditions (i.e., different developmental temperatures and, to some extent, altered TH levels) on SMR and particularly on BC at the onset of metamorphosis was carried over to froglets at the end of metamorphic climax. This has far reaching consequences, since body condition at metamorphosis is known to determine metamorphic success and, thus, is indirectly linked to individual fitness in later life stages.

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Section: Altered Th Levels and Higher Temperatures Affect Smr And Bodmentioning

confidence: 48%

Post-metamorphic carry-over effects of altered thyroid hormone level and developmental temperature: physiological plasticity and body condition at two life stages in Rana temporaria

et al. 2020

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“…The first major mechanism underlying CITS is a higher metabolic conversion of the pesticide to a more toxic metabolite at higher temperatures (Harwood et al, 2009;Noyes et al, 2009). The second major mechanism underlying CITS is that at higher temperatures, ectotherms have a higher metabolism that causes a higher respiration and food intake to meet the higher metabolic costs (Hallman and Brooks, 2015;Noyes et al, 2009). This results in an increased toxicity when the higher toxicant uptake and especially the higher metabolic conversion overrule any increased detoxification and excretion rates at higher temperatures (Noyes et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Our knowledge of how DTFs increase toxicity of pesticides is, however, in its infancy and studies so far mainly focused on life history and largely ignored physiology (except for cholinesterase activity, Willming et al 2013). Two of these studies (Hallman and Brooks, 2015;Willming and Maul, 2016) did expose animals to a currently experienced DTF level and a predicted increase in DTF level, which is needed to better integrate DTF in ERA under climate change. However, in both studies DTF levels had different mean temperatures than the constant temperature treatment, precluding disentangling the effects of DTF and mean temperature.…”

Section: Introductionmentioning

confidence: 99%

Current and future daily temperature fluctuations make a pesticide more toxic: Contrasting effects on life history and physiology

Verheyen

Stoks

2019

Environmental Pollution

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There is increasing concern that climate change may make organisms more sensitive to chemical pollution. Many pesticides are indeed more toxic at higher mean temperatures. Yet, we know next to nothing about the effect of another key component of climate change, the increase of daily temperature fluctuations (DTFs), on pesticide toxicity. Therefore, we tested the effect of the pesticide chlorpyrifos under different levels of DTF (constant = 0°C, low = 5°C (current maximum level) and high = 10°C (predicted maximum level under global warming))around the same mean temperature on key life history and physiological traits of Ischnura elegans damselfly larvae in a common-garden experiment. At all levels of DTF, chlorpyrifos exposure was stressful: it reduced energy storage (fat content) and the activity of its target enzyme acetylcholinesterase, while it increased the activity of the detoxification enzyme cytochrome P450 monooxygenase. Notably, chlorpyrifos did not cause mortality or reduced growth rate at the constant temperature (0°C DTF), yet increased mortality 6x and reduced growth rate with ca. 115 % in the presence of DTF. This indicates that daily short-term exposures to higher temperatures can increase pesticide toxicity. Our data suggest that when 5°C DTF will become more common in the studied high-latitude populations, this will increase the toxicity of CPF, and that a further increase from 5° DTF to 10°C DTF may not result in a further increase of pesticide toxicity. Our results highlight the biological importance of including daily temperature fluctuations in ecological risk assessment of pesticides and as an extra dimension in the climate-induced toxicant sensitivity concept.Capsule: Chlorpyrifos only induced mortality and reduced growth rate in the presence of daily temperature fluctuations and not when the temperature was kept constant.

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“…Outside of this so-called "legacy pollution," urbanization and increasing human populations have led to increases in water pollution caused by chemicals of emerging concern (CECs): chemicals that are increasingly being detected in surface waters at low concentrations, and for which there is concern about their detrimental effects on aquatic life: e.g., pharmaceuticals and personal care products. Heavy metals continue to pose a threat to aquatic life, and are detected at concentrations that affect the functioning of fishes' nervous systems, affecting behavior and olfaction, and risk of predation (Brooks et al 2012;Grossman 2016); responses to exposure are known to be altered by exposure temperature, as well as prior thermal acclimation history of aquatic species (Hallman and Brooks, 2015). The introduction of novel stressors such as microplastics and synthetic fibers act as new vectors for many pollutants, and present their own direct physical and chemical effects once ingested (Sutton et al 2016;Maruya et al 2018).…”

Section: Challenges In Regulatory Frameworkmentioning

confidence: 99%

Review of and Recommendations for Monitoring Contaminants and their Effects in the San Francisco Bay−Delta

Connon

Hasenbein

Brander

et al. 2019

SFEWS

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Legacy and current-use contaminants enter into and accumulate throughout the San Francisco Bay−Delta (Bay−Delta), and are present at concentrations with known effects on species important to this diverse watershed. There remains major uncertainty and a lack of focused research able to address and provide understanding of effects across multiple biological scales, despite previous and ongoing emphasis on the need for it. These needs are challenging specifically because of the established regulatory programs that often monitor on a chemical-by-chemical basis, or in which decisions are grounded in lethality-based endpoints. To best address issues of contaminants in the Bay−Delta, monitoring efforts should consider effects of environmentally relevant mixtures and sub-lethal impacts that can affect ecosystem health. These efforts need to consider the complex environment in the Bay−Delta including variable abiotic (e.g., temperature, salinity) and biotic (e.g., pathogens) factors. This calls for controlled and focused research, and the development of a multi-disciplinary contaminant monitoring and assessment program that provides information across biological scales. Information gained in this manner will contribute toward evaluating parameters that could alleviate ecologically detrimental outcomes. This review is a result of a Special Symposium convened at the University of California−Davis (UCD) on January 31, 2017 to address critical information needed on how contaminants affect the Bay−Delta. The UCD Symposium focused on new tools and approaches for assessing multiple stressor effects to freshwater and estuarine systems. Our approach is similar to the recently proposed framework laid out by the U.S. Environmental Protection Agency (USEPA) that uses weight of evidence to scale toxicological responses to chemical contaminants in a laboratory, and to guide the conservation of priority species and habitats. As such, we also aimed to recommend multiple endpoints that could be used to promote a multi-disciplinary understanding of contaminant risks in Bay−Delta while supporting management needs.

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The deal with diel: Temperature fluctuations, asymmetrical warming, and ubiquitous metals contaminants

Cited by 26 publications

References 43 publications

Post-metamorphic carry-over effects of altered thyroid hormone level and developmental temperature: physiological plasticity and body condition at two life stages in Rana temporaria

Post-metamorphic carry-over effects of altered thyroid hormone level and developmental temperature: physiological plasticity and body condition at two life stages in Rana temporaria

Current and future daily temperature fluctuations make a pesticide more toxic: Contrasting effects on life history and physiology

Review of and Recommendations for Monitoring Contaminants and their Effects in the San Francisco Bay−Delta

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