Simulated extreme high temperatures alter the demographic parameters of Aphelinus asychis and diminish parasitoid fitness

Yu, Xing‐Lin; Li, Jia-Yu; Zhou, Yu-Tong; Peng, Jing; Qiu, Bao‐Li

doi:10.1016/j.biocontrol.2022.105028

Cited by 6 publications

(6 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hosts and parasitoids may able to cope with heat stress by accumulating heat shock proteins and biogenic amines (Gonzalez-Tokman et al, 2020), allowing them to acclimate to the new environment, but with an extra energetic cost. This energetic cost may result in prolonged developmental time (Gillespie et al, 2012, Zhang et al, 2019, and reduced fitness in the adult stage (Yu et al, 2022, Nguyen et al, 2013 as a trade-off.…”

Section: Discussionmentioning

confidence: 99%

Humidity modifies age-dependent heat wave effects in an insect host-parasitoid interaction

Li,

Brough,

Rees

et al. 2024

Preprint

View full text Add to dashboard Cite

1. Climate change is projected to increase the likelihood of extreme heat events, but it may also alter humidity levels, leading to the potential for coupled thermal and hydric stress. While increasing frequency and intensity of extreme heat events have been well-documented for their negative effects on species and their interactions, how humidity modulates the impacts of heat waves is currently unknown. 2. We investigated how humidity interacted with heat waves of different timings and durations to affect the life histories in an insect host-parasitoid interaction, comprising the Indian meal moth, Plodia interpunctella, and its endoparasitoid wasp, Venturia canescens. Hosts parasitised as 4th instar larvae and unparasitized hosts were maintained in a high humid (60.8% RH) or low-humid (32.5% RH) environment at a constant temperature of 28℃. They were then exposed to 38℃ heatwaves with a duration of 6 or 72 hours in either the 4th or 5th instar. 3. Humidity and heat waves did not affect the adult emergence of unparasitized hosts, but longer heat waves and lower humidity increased the probability that host adults emerged from parasitized hosts, indicating the negative effect of these conditions on the survival of parasitoids. Furthermore, juvenile development time and body size of hosts and parasitoids responded differently to timing and duration of heat waves, and high humidity decreased larval development time of unparasitized hosts and increased the size of both hosts and parasitoids. In addition, humidity negatively interacted with larval stage and duration of heat waves to affect the size of unparasitized hosts, but this effect was not found in parasitoids. 4. Our results show that humidity modulates the life history of hosts and parasitoids, highlighting the importance of humidity in maintaining host-parasitoid interactions. Humidity should be considered when predicting the impact of temperature extremes on species’ population dynamics and their interactions.

show abstract

Section: Discussionmentioning

confidence: 99%

Humidity modifies age-dependent heat wave effects in an insect host-parasitoid interaction

Li,

Brough,

Rees

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…1 ). Studies on bet-hedging could also be of importance from an applied perspective, as the increase of extreme temperature events can decrease parasitism rates, and, therefore, the efficiency of parasitoids as natural enemies in various agro-ecosystems ( Wetherington et al, 2017 ; Yu et al, 2022 ; Costaz et al 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Bet-hedging in parasitoids: when optimization is not the best strategy to cope with climatic extremes

van Baaren,

Boivin,

Visser

et al. 2024

Current Research in Insect Science

View full text Add to dashboard Cite

“…Hosts and parasitoids may be able to cope with heat stress by accumulating heat shock proteins and biogenic amines (González‐Tokman et al., 2020 ), allowing them to acclimate to the new environment, but this is associated with an extra energetic cost. This cost may result in prolonged developmental time (Gillespie et al., 2012 ; Zhang et al., 2019 ) and reduced fitness in the adult stage (Nguyen et al., 2013 ; Yu et al., 2022 ) as life history trade‐offs.…”

Section: Discussionmentioning

confidence: 99%

Humidity modifies species‐specific and age‐dependent heat stress effects in an insect host‐parasitoid interaction

Li,

Brough,

Rees

et al. 2024

Ecology and Evolution

View full text Add to dashboard Cite

Climate change is projected to increase the frequency and intensity of extreme heat events, and may increase humidity levels, leading to coupled thermal and hydric stress. However, how humidity modulates the impacts of heat stress on species and their interactions is currently unknown. Using an insect host‐parasitoid interaction: the Indian meal moth, Plodia interpunctella, and its endoparasitoid wasp, Venturia canescens, we investigated how humidity interacted with heat stress duration, applied at different host developmental stages, to affect life history traits. Hosts parasitized as 4th instar larvae and unparasitized hosts were maintained in high‐ (60.8% RH) or low‐humidity (32.5% RH) at constant 28°C. They were then exposed to a 38°C thermal stress with a duration of 0 (no heat stress), 6 or 72 h in either the 4th or 5th host instar. Neither humidity nor heat stress duration affected emergence of unparasitized hosts, but increasing heat stress duration during the 4th instar decreased parasitoid emergence irrespective of humidity. When applied during the 5th instar, increasing heat duration decreased parasitoid emergence under low humidity, but no effect of heat stress was found under high humidity. Moreover, experiencing longer heat stress in the 4th instar increased host larval development time and decreased body size under high humidity, but this effect differed under low humidity; increasing heat duration in the 5th instar decreased parasitoid body sizes only under low humidity. Larval stage and heat stress duration directly affected parasitized host survival time, with a concomitant indirect reduction of parasitoid sizes. We show that humidity modifies key life history responses of hosts and parasitoids to heat stress in species‐specific ways, highlighting the potential importance of humidity in regulating host‐parasitoid interactions and their population dynamics. Finally, we emphasize that interactions between environmental stressors need to be considered in climate change research.

show abstract

Simulated extreme high temperatures alter the demographic parameters of Aphelinus asychis and diminish parasitoid fitness

Cited by 6 publications

References 72 publications

Humidity modifies age-dependent heat wave effects in an insect host-parasitoid interaction

Humidity modifies age-dependent heat wave effects in an insect host-parasitoid interaction

Bet-hedging in parasitoids: when optimization is not the best strategy to cope with climatic extremes

Humidity modifies species‐specific and age‐dependent heat stress effects in an insect host‐parasitoid interaction

Contact Info

Product

Resources

About