Heat waves affect an invasive herbivore and its parasitoid differentially with impacts beyond the first generation

Simaz, Olivia; Szűcs, Marianna

doi:10.1002/ecs2.3796

Cited by 6 publications

(5 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 days following parasitism of P. interpunctella (Harvey et al, 1994), suggesting that the parasitoids may be in the embryonic stage when they experienced heat waves during the 4 th instar. Furthermore, the timing of heat waves could modify the life history of surviving parasitoids (Simaz andSzűcs, 2021, Zhang et al, 2019), as our results also showed that parasitoids experiencing heat waves at a later stage decreased their juvenile development time and increased their hind tibia length. Although the physiological mechanisms underpinning these life history changes of surviving parasitoids were not clear, our results highlighted that the effect of heat stress on the success of parasitism was stage specific.…”

Section: Discussionsupporting

confidence: 70%

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: Discussionsupporting

confidence: 70%

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

“…5 days following parasitism of P. interpunctella (Harvey et al., 1994 ), suggesting that the parasitoids may still be in the embryonic stage when they experienced heat waves during the 4th instar. Furthermore, the timing of heat stress could modify the life history of surviving parasitoids (Simaz & Szűcs, 2021 ; Zhang et al., 2019 ), as we also showed that parasitoids experiencing heat stress at a later stage had shorter larval development time and increased their hind tibia length. Although the physiological mechanisms underpinning these life history changes were not clear, our results highlighted that the effect of heat stress on the success of parasitism was stage specific.…”

Section: Discussionsupporting

confidence: 65%

“…The timing of heat stress is known to be important for host‐parasitoid interactions, as some development stages of parasitoids are more sensitive to heat stress than other stages (Simaz & Szűcs, 2021 ; Valls et al., 2020 ; Zhang et al., 2019 ). In accordance with our predictions, we showed that experiencing longer heat stress at an early stage (4th instar) increased parasitoid mortality, but had no effect on unparasitized hosts, suggesting that experiencing heat stress at an early stage of ontogeny may be critical to parasitoid survival.…”

Section: Discussionmentioning

confidence: 99%

“…To our knowledge, there are few studies examining these direct and indirect effects across two trophic levels. Simaz and Szűcs ( 2021 ) found increasing heat wave intensity could directly affect the life history of the host Halyomorpha halys and the parasitoid Trissolcus japonicus , and indirectly affecting parasitoid emergence in the second generation. However, we demonstrated that the direct and indirect effect of heat stress could be observed even within a single generation, as the host responses are directly related to the ontogenetic development of koinobiont parasitoids (Harvey et al., 1994 ).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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

“…Another practical consideration is that the same climate that has been selected for the drought-adapted shrub-steppe plant community has equally important direct effects on H. halys survival and development. Both high temperatures and low humidity characteristic of eastern WA may independently affect population growth (Fisher et al 2020, Simaz and Szűcs 2021). Our matrix model analyses were made with the two highest temperatures available in the Fisher et al (2020) study (40°C and 42°C), with the idea that 40°C represents a “typical” period of high mid-summer temperatures in our region.…”

Section: Discussionmentioning

confidence: 99%

Suitability of the shrub-steppe habitat of Eastern Washington for Halyomorpha halys (Hemiptera: Pentatomidae)

Hepler,

Mills,

Smytheman

et al. 2023

Environmental Entomology

View full text Add to dashboard Cite

The invasive brown marmorated stink bug, Halyomorpha halys Stål (Hemiptera: Pentatomidae), has spread throughout most of Washington (WA) State since its detection in 2012. While it has emerged as a major agricultural and nuisance pest in the Pacific Northwest (PNW) west of the Cascade Mountains, pest pressure in the major tree fruit-growing areas in semi-arid northern and central WA State remains low. The reasons for this are unclear, although both biotic and abiotic conditions may be contributing factors. We evaluated the suitability of a common shrub-steppe/riparian corridor plant assemblage for supporting H. halys development from egg to adult in summer and fall through controlled feeding studies. Nymphs successfully completed development on this diet of PNW native plants, though it generally resulted in lower survivorship and adult weight and longer developmental times than a modified colony diet or a diet of known hosts from the eastern United States. These developmental data were used to parameterize stage-structured matrix models to predict the impact of diet and extreme heat events on H. halys population growth. The predicted net reproductive rate (R0) of H. halys was consistently and substantially reduced by a diet of PNW native plants, and heat shock imposed further severe reductions in R0. Our results suggest that the combined population effects of suboptimal plant host quality and regional heat waves may explain the lack of landscape-level H. halys pest pressure in semi-arid regions of the PNW.

show abstract

Heat waves affect an invasive herbivore and its parasitoid differentially with impacts beyond the first generation

Abstract: Heat waves affect an invasive herbivore and its parasitoid differentially with impacts beyond the first generation.

Cited by 6 publications

References 55 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

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

Suitability of the shrub-steppe habitat of Eastern Washington for Halyomorpha halys (Hemiptera: Pentatomidae)

Contact Info

Product

Resources

About