A simulated heat wave—but not herbicide exposure—alters resource investment strategy in an insect

Stahlschmidt, Zachary R.; Choi, Jae S.; Choy, Barry K.; Pérez, Pastor; Whitlock, J.

doi:10.1016/j.jtherbio.2023.103670

Cited by 3 publications

(3 citation statements)

References 73 publications

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“…We assigned the remaining crickets (n = 63) to a low predation risk treatment characterized by sheltered food and drinking water, and by a lack of predator scent (electronic supplementary material, figure S1). We also randomly assigned half of the crickets (n = 69) to a control temperature treatment (17-31°C daily cycle) and the remaining crickets (n = 61) to a simulated heatwave treatment (24-38°C daily cycle) as described previously ( [26]; electronic supplementary material).…”

Section: (B) Experimental Designmentioning

confidence: 99%

“…After 5 days, we reweighed each cricket and its food. We then euthanized and stored each cricket at −20°C before estimating investment into and allocation to reproductive and non-reproductive (somatic) tissues as previously described [26] [33]. Briefly, after storage, we removed and weighed each cricket's ovaries to determine total investment into reproduction.…”

Section: (B) Experimental Designmentioning

confidence: 99%

“…In the variable field cricket (Gryllus lineaticeps), we factorially manipulated predation risk (sheltered food and an absence of predator cues versus exposed food and presence of predator cues) and temperature (control regime versus simulated heatwave) to address three aims. In G. lineaticeps, heatwave exposure increases feeding and resource allocation to reproductive tissue [26], sensu a 'terminal investment' strategy where stress leads to the prioritization of current reproduction to maximize lifetime reproduction (reviewed in [27]). The first aim addressed whether predation risk similarly facilitates terminal investment or, by contrast, a reproductive restraint strategy where stress prioritizes somatic investment over current reproduction, presumably to facilitate future reproductive opportunities (reviewed in [28]).…”

Section: Introductionmentioning

confidence: 99%

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Hot and scared: how do heatwaves and predation risk impact resource acquisition and allocation?

Stahlschmidt,

Joura,

Makarem

et al. 2024

Biol. Lett.

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Heatwaves are increasingly prevalent and can constrain investment into important life-history traits. In addition to heatwaves, animals regularly encounter threats from other organisms in their environments, such as predators. The combination of these two environmental factors introduces a decision-making conflict—heat exposure requires more food intake to fuel investment into fitness-related traits, but foraging in the presence of predators increases the threat of mortality. Thus, we used female variable field crickets ( Gryllus lineaticeps ) to investigate the effects of heatwaves in conjunction with predation risk (exposed food and water sources, and exposure to scent from black widow spiders, Latrodectus hesperus ) on resource acquisition (food intake) and allocation (investment into ovarian and somatic tissues). A simulated heatwave increased food intake and the allocation of resources to reproductive investment. Crickets exposed to high predation risk reduced food intake, but they were able to maintain reproductive investment at an expense to investment into somatic tissue. Thus, heatwaves and predation risk deprioritized investment into self-maintenance, which may impair key physiological processes. This study is an important step towards understanding the ecology of fear in a warming world.

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Section: (B) Experimental Designmentioning

confidence: 99%

Section: (B) Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hot and scared: how do heatwaves and predation risk impact resource acquisition and allocation?

Stahlschmidt,

Joura,

Makarem

et al. 2024

Biol. Lett.

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Toxicity of glyphosate to animals: A meta-analytical approach

Evalen,

Barnhardt,

Ryu

et al. 2024

Environmental Pollution

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Growth, development, and life history of a mass-reared edible insect,Gryllodes sigillatus(Orthoptera: Gryllidae)

Kong,

Ritchie,

Vadboncoeur

et al. 2024

Preprint

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Insects provide a potential source of sustainable, alternative protein that can help meet the protein demands of a growing population. Efficient farming of insects to meet this demand depends on an understanding of insect life history. Yet, detailed information and expertise about a single species are not always available for practitioners to make informed decisions about rearing practices or identify arising issues. The cricket (Gryllodes sigillatus) is commonly farmed for human consumption or animal feed, but few studies have characterized the life history of this species throughout ontogeny. Here, we describe the growth and development ofG. sigillatusfrom hatch to adulthood and quantify reproductive traits relevant to mass-rearing and colony management, including egg development. This information provides foundation to start and manage a cricket colony and to conduct research on growth and performance. We highlight ways that a fundamental understanding of cricket biology can be informative for optimizing cricket growth, reducing variability in yield and informing future precision farming practices.

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A simulated heat wave—but not herbicide exposure—alters resource investment strategy in an insect

Cited by 3 publications

References 73 publications

Hot and scared: how do heatwaves and predation risk impact resource acquisition and allocation?

Hot and scared: how do heatwaves and predation risk impact resource acquisition and allocation?

Toxicity of glyphosate to animals: A meta-analytical approach

Growth, development, and life history of a mass-reared edible insect,Gryllodes sigillatus(Orthoptera: Gryllidae)

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