Negative carry‐over effects on larval thermal tolerances across a natural thermal gradient

Waite, Heidi R.; Sorte, Cascade J. B.

doi:10.1002/ecy.3565

Cited by 17 publications

(10 citation statements)

References 88 publications

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“…In this study, we used estimates of critical thermal maxima derived from laboratory experiments, which measured mosquito life history traits (including immature and adult survival and development as well as fecundity, biting rate, and egg viability) under constant temperatures, typically occurring for several hours, days, or weeks (Supplemental Table S1; summarized in Mordecai et al 2019 andVillena et al 2022). Prior work has demonstrated that the duration of heat exposure and the rate of temperature change used in heat tolerance assays, as well as the thermal history of the organism itself, including cross-generational effects, can all impact the estimated critical thermal maxima (Heerwaarden & Kellermann 2020;Kingsolver et al 2011Kingsolver et al , 2015Schiffer et al 2013;Terblanche et al 2007;Waite & Sorte 2022). As a result, there is no single definitive critical thermal maximum for a given taxon or individual, but instead a continuum depending on temporal dynamics of heat exposure and the specific trait of interest (Bates & Morley 2020;Clusella-Trullas et al 2021;Hoffmann et al 2013;Jørgensen et al 2019;Kellermann et al 2012;Lutterschmidt & Hutchison 1997).…”

Section: Discussionmentioning

confidence: 99%

How much warming can mosquito vectors tolerate?

Couper,

Desire Uwera Nalukwago,

Lyberger

et al. 2024

Preprint

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While climate warming is expected to substantially impact the global landscape of mosquito-borne disease, impacts will vary across disease systems and regions. Understanding which diseases, and where within their distributions, these impacts are most likely to occur is critical for preparing public health interventions. While research has centered on potential warming-driven expansions in vector transmission, less is known about the potential for vectors to experience warming-driven stress or even local extirpations. In conservation biology, species risk from climate warming is often quantified through vulnerability indices such as thermal safety margins — the difference between an organism's upper thermal limit and its habitat temperature. Here, we estimated thermal safety margins for 12 major mosquito species (including Aedes aegypti and Anopheles gambiae) that are the major vectors of malaria, dengue, chikungunya, Zika, West Nile and other major arboviruses, across their known ranges to investigate which mosquitoes and regions are most and least vulnerable to climate warming. We find that most mosquito vector species have large positive thermal safety margins across the majority of their range, when realistic assumptions of mosquito behavioral thermoregulation are incorporated. For species with distributions spanning both hemispheres, we find the lowest climate vulnerability, in terms of both the magnitude and duration of thermal safety, just south of the equator, as well as at their northern temperate range edges, and the highest climate vulnerability in the subtropics. Underlying these broad scale patterns, we find clear biogeographical differences in vector thermal safety with regions such as the Middle East, India, northwestern Africa, southeastern Australia, and the southwestern U.S., and desert and xeric shrubland biomes having the highest climate vulnerability across vector species.

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Section: Discussionmentioning

confidence: 99%

How much warming can mosquito vectors tolerate?

Couper,

Desire Uwera Nalukwago,

Lyberger

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Future work should therefore assess acclimation to more extreme temperatures than studied here, to find the range at which it can no longer prevent the accumulation of damage and homeostasis is disrupted to the point of mortality (Ørsted, Jørgensen & Overgaard 2022). Another key step will be to assess potential trade-offs, for example, between parents’ investment in their own defenses against warming versus those of offspring (Waite & Sorte 2022). Nevertheless, our results imply that gradual warming may benefit ectotherms not yet living at their thermal limits if acclimation induces thermodynamic effects that enhance survival, or prove detrimental if survival declines because mechanisms of temperature compensation are disrupted.…”

Section: Discussionmentioning

confidence: 99%

When is warmer better? Disentangling within- and between-generation effects of thermal history on survival

Rebolledo

Sgrò

Monro

2023

Preprint

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Understanding the fitness consequences of thermal history is necessary to predict organismal responses to global warming. This is especially challenging for ectotherms with complex life cycles, since distinct life stages can differ in thermal sensitivity, acclimate to different thermal environments, and accrue responses to acclimation within and between generations. Although acclimation is widely hypothesized to benefit organisms by helping them (or their offspring) to compensate for negative impacts of environmental change, equivocal support for this hypothesis highlights the need to assess alternatives. However, assessments that do so in ways that explicitly dissect responses across life stages and generations remain limited. We assess alternative hypotheses for acclimation responses (none, beneficial, colder-is-better, and warmer-is-better) within and between generations of an externally-fertilizing marine tubeworm whose vulnerability to warming rests on survival at early planktonic stages (gametes, embryos, and larvae). We start by acclimating parents, gametes, and embryos to ambient and projected warmer temperatures (17 °C and 22 °C) factorially by life stage. We then rear individuals with differing acclimation histories to the end of larval development at test temperatures from 10 °C to 28 °C (upper and lower survival limits) to estimate thermal survival curves for development, and compare curves among acclimation histories. We show that survival curves are most responsive to parental acclimation followed by acclimation at embryogenesis, but are buffered against acclimation at fertilization. Moreover, curves respond independently to acclimation within and between generations, and respond largely as predicted by the warmer-is-better hypothesis, despite the semblance of beneficial acclimation after successive acclimations to warmer temperature. Our study demonstrates the varied nature of thermal acclimation, and the importance of considering how acclimation responses aggregate across complex life cycles when predicting vulnerability to warming.

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“…However, assessing responses to fluctuating temperatures, in addition to more extreme temperatures, would deliver more realistic insights into the limits beyond which acclimation no longer prevents death by heat (Ørsted et al, 2022). Another key step would be to assess trade‐offs between parents' investments in their own defences against warming versus those of offspring (Waite & Sorte, 2022). Nevertheless, our results imply that warming may unexpectedly benefit ectotherms not yet living at their thermal limits if acclimation induces thermodynamic effects that enhance survival.…”

Section: Discussionmentioning

confidence: 99%

When is warmer better? Disentangling within‐ and between‐generation effects of thermal history on early survival

2023

View full text Add to dashboard Cite

Understanding the fitness consequences of thermal history is necessary to predict organismal responses to global warming. This is especially challenging for ectotherms with complex life cycles, where distinct life stages can differ in thermal sensitivity, acclimate to different thermal environments and accrue responses to acclimation within and between generations. Although acclimation is often hypothesized to benefit organisms by helping them (or their offspring) to compensate for negative impacts of environmental change, mixed support for this hypothesis highlights the need to assess alternatives. Assessments that explicitly dissect responses across life stages and generations, however, remain limited. We assess alternative hypotheses of acclimation (none, beneficial, colder‐is‐better and warmer‐is‐better) within and between generations of a marine tubeworm whose vulnerability to warming rests on survival at early planktonic stages (gametes, embryos and larvae). First, we acclimate parents, gametes and embryos to ambient and projected warmer temperatures (17°C and 22°C) factorially by life stage. Next, we rear offspring with differing acclimation histories to the end of larval development at test temperatures from 10°C to 28°C (lower and upper survival limits respectively). Last, we estimate thermal survival curves for development, and compare them among thermal histories. We show that survival curves are most responsive to parental acclimation followed by acclimation at embryogenesis, but are buffered against acclimation at fertilization. Moreover, curves respond independently to acclimation within and between generations, and respond largely as predicted by the warmer‐is‐better hypothesis, despite the semblance of beneficial acclimation after successive doses of warmer temperature. Our study demonstrates the varied nature of thermal acclimation and the importance of considering how responses aggregate across complex life cycles when predicting vulnerability to warming. Read the free Plain Language Summary for this article on the Journal blog.

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Negative carry‐over effects on larval thermal tolerances across a natural thermal gradient

Cited by 17 publications

References 88 publications

How much warming can mosquito vectors tolerate?

How much warming can mosquito vectors tolerate?

When is warmer better? Disentangling within- and between-generation effects of thermal history on survival

When is warmer better? Disentangling within‐ and between‐generation effects of thermal history on early survival

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