Context-dependent integrated stress resistance promotes a global invasive pest
In nature, insects concurrently face multiple environmental stressors, a sce- nario likely increasing with climate change. Integrated stress resistance (ISR) thus often improves fitness and could drive invasiveness, but how physiological mechanisms influ- ence invasion has lacked examination. Her...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022
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| Subjects: | |
| Online Access: | https://doi.org/10.1111/1744-7917.13035 http://hdl.handle.net/11408/5062 |
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| Summary: | In nature, insects concurrently face multiple environmental stressors, a sce-
nario likely increasing with climate change. Integrated stress resistance (ISR) thus often
improves fitness and could drive invasiveness, but how physiological mechanisms influ-
ence invasion has lacked examination. Here, we investigated cross-tolerance to abiotic
stress factors which may influence range limits in the South American tomato pinworm—
a global invader that is an ecologically and socially damaging crop pest. Specifically, we
tested the effects of prior rapid cold- and heat-hardening (RCH and RHH), fasting, and
desiccation on cold and heat tolerance traits, as well as starvation and desiccation sur-
vivability between T. absoluta life stages. Acclimation effects on critical thermal minima
(CT min ) and maxima (CT max ) were inconsistent, showing significantly deleterious effects
of RCH on adult CT max and CT min and, conversely, beneficial acclimation effects of RCH
on larval CT min . While no beneficial effects of desiccation acclimation were recorded
for desiccation tolerance, fasted individuals had significantly higher survival in adults,
whereas fasting negatively affected larval tolerances. Furthermore, fasted and desiccation
acclimated adults had significantly higher starvation tolerance, showing strong evidence
for cross-tolerance. Our results show context-dependent ISR traits that may promote T.
absoluta fitness and competitiveness. Given the frequent overlapping occurrence of these
divergent stressors, ISR reported here may thus partly elucidate the observed rapid global
spread of T. absoluta into more stressful environments than expected. This information is
vital in determining the underpinnings of multistressor responses, which are fundamental
in forecasting species responses to changing environments and management responses. |
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